# DPF 2011

8-13 August 2011
Rhode Island Convention Center
US/Eastern timezone
Home > Contribution List
Displaying 431 contributions out of 431
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
In some supersymmetric (SUSY) models, a charged Higgs boson ($\rm H^\pm$) can decay into a chargino-neutralino ($\rm\chi^\pm_i \chi^0_j$) pair producing a final state containing three leptons (electron/muon) and missing transverse energy ($3\ell+E_{\mathrm{T}}^{\mathrm{miss}}$). Such a decay could provide extra sensitivity to the $\rm H^\pm$, especially in the region of SUSY parameter space near ... More
Presented by Mr. Caleb LAMPEN on 10 Aug 2011 at 15:33
Type: Parallel contribution Session: Detector Technology and R&D
Track: Detector Technology and R&D
In hadron collider experiments, triggering the detector to store interesting events for offline analysis is a challenge due to the high rates and multiplicities of particles produced. The LHC will soon operate at a center-of-mass energy of 14 TeV and at high instantaneous luminosities of the order of 10^34 to 10^35 / cm^2 / second. A multi-level trigger strategy is used in ATLAS, with the first le ... More
Presented by Mark NEUBAUER on 9 Aug 2011 at 15:10
Type: Parallel contribution Session: Electroweak Physics
Track: Electroweak Physics
The measurement of hadronic activity recoiling against W and Z vector bosons provides an important test of perturbative QCD, as well as a method of searching for new physics in a model independent fashion. We present a study of the cross-section ratio for the production of W and Z gauge bosons in association with exactly one jet R-jets= (W+1jet)/(Z+1jet), in pp collisions at sqrt(s) = 7 TeV. The s ... More
Presented by Mr. Andrew Robert MEADE on 9 Aug 2011 at 17:40
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
We present a measurement of the ttbar cross section as well as the first measurement of the top quark mass in hadronic tau + jets events from 1.96 TeV ppbar collisions at CDF. Events require a single lepton identified as a hadronic tau, missing Et, and 4 jets of which at least one must be tagged as a b jet. Both the cross section and the mass are extracted from unbinned likelihood functions. The c ... More
Presented by Daryl HARE on 9 Aug 2011 at 16:00
Type: Parallel contribution Session: CP-Violation
Track: CP-Violation
We study a new type of CP violating observable that arises in three body decays. We consider decays that are dominated by an intermediate resonance that can go on shell. In many cases, the decay can occur via two different orderings. The required CP-even phase arises due to the different virtualities of the resonance in the two diagrams corresponding to these orderings. This method can be an i ... More
Presented by Joshua BERGER on 11 Aug 2011 at 12:06
Type: Parallel contribution Session: Perturbative and non-Perturbative QCD
Track: Perturbative and non-Perturbative QCD
A simple and previously overlooked choice of one parameter allows the Schwinger/Symanzik Generating Functional of QCD to be re-written in a manifestly gauge-invariant fashion, without the need of Fadeev-Popov insertions. When combined with Fradkin functional representations for the Green's function, G[A], of a quark in an effective color potential A, and the vacuum loop functional L[A], all QCD co ... More
Presented by Herbert FRIED on 9 Aug 2011 at 14:50
Type: Parallel contribution Session: Low Energy Searches for Physics Beyond the Standard Model
Track: Low Energy Searches for Physics Beyond the Standard Model
on behalf of the MuLan Collaboration The Fermi constant, G_F, describes the strength of the weak force and is determined most precisely from the mean life of the positive muon, tau_mu. Advances in theory have reduced the theoretical uncertainty on G_F as calculated from tau_mu to a few tenths of a part per million (ppm). Until recently, the remaining uncertainty on G_F was entirely experim ... More
Presented by Dr. David WEBBER on 12 Aug 2011 at 11:10
Type: Parallel contribution Session: Perturbative and non-Perturbative QCD
Track: Perturbative and non-Perturbative QCD
Monte Carlo generators (Pythia and Phojet) which were tuned for energies up to that of the Tevatron, appear to be found wanting when extended to LHC energies. We have constructed a model that satisfies the theoretical requisites of high energy soft interactions, based on two conjectures: (i) the results of N =4 SYM, which at present is a unique theory that allows one to deal with a large ... More
Presented by Prof. Errol GOTSMAN on 12 Aug 2011 at 08:40
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
We report on a search for a doubly charged Higgs H++ --> l+l+ conducted by the CMS experiment with the data accumulated during the 2010 & 2011 running of the LHC at sqrt(s) = 7 TeV.
Presented by Maxwell CHERTOK on 10 Aug 2011 at 18:36
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
We report on a search for a BSM Higgs Boson in the mode H --> Tau Tau conducted by the CMS experiment with the data accumulated during the 2010 & 2011 running of the LHC at sqrt(s) = 7 TeV.
Presented by Mr. Louis James ANTONELLI on 12 Aug 2011 at 08:18
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
We report on a search for the Higgs boson in the decay mode H --> WW based on data collected by the CMS experiment during the 2010+2011 running of the LHC.
Presented by Kevin Kai Hong SUNG on 10 Aug 2011 at 16:51
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
We report on a search for SM Higgs Boson in the mode H --> ZZ--> 2l 2jet conducted by the CMS experiment with the data accumulated during the 2010 & 2011 running of the LHC at sqrt(s) = 7 TeV.
Presented by Ashish KUMAR on 9 Aug 2011 at 14:46
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
We report on a search for SM Higgs Boson in the mode H --> ZZ--> 2l 2nu conducted by the CMS experiment with the data accumulated during the 2010 & 2011 running of the LHC at sqrt(s) = 7 TeV.
Presented by Daniele TROCINO on 9 Aug 2011 at 16:00
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
We report on a search for SM Higgs Boson in the mode H --> ZZ--> 4l conducted by the CMS experiment with the data accumulated during the 2010 & 2011 running of the LHC at sqrt(s) = 7 TeV.
Presented by Mario PELLICCIONI on 9 Aug 2011 at 15:09
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
We report on a search for SM Higgs Boson in the mode H --> gamma gamma conducted by the CMS experiment with the data accumulated during the 2010 & 2011 running of the LHC at sqrt(s) = 7 TeV.
Presented by Christopher Allan PALMER on 10 Aug 2011 at 16:30
Type: Parallel contribution Session: Low Energy Searches for Physics Beyond the Standard Model
Track: Low Energy Searches for Physics Beyond the Standard Model
The experimental search for a neutron electric dipole moment could reveal new sources of time-reversal (T) and charge-conservation-and-parity (CP) violation and challenge proposed extensions to the Standard Model. The goal of the present experiment is to improve the measurement sensitivity of the neutron EDM by two orders of magnitude. The physics goals of this experiment remain timely and of ... More
Presented by Prof. Paul HUFFMAN on 9 Aug 2011 at 14:20
Type: Parallel contribution Session: Hadron Spectroscopy
A new algorithm ("stochastic LapH") for computing hadronic correlation functions in Lattice QCD will be presented. Lattice QCD is a framework in which the nonperturbative, first principles computation of hadronic correlation functions is possible. It requires a lattice regulation of QCD in a finite Euclidean space-time where correlation functions are evaluated numerically via Monte-Carlo integrati ... More
Presented by Prof. Keisuke JUGE on 12 Aug 2011 at 09:10
Type: Parallel contribution Session: Low Energy Searches for Physics Beyond the Standard Model
Track: Low Energy Searches for Physics Beyond the Standard Model
High intensity polarized proton beams in storage rings make possible the development of an experiment to probe the proton electric dipole moment (EDM) with sensitivity of 10^-29 e-cm. At this level it will be sensitive to new physics at the 3000 TeV and if new physics exists at the LHC scale, it will be sensitive at the sub-micro-radian level of CP-violating phases. The method utilizes an electr ... More
Presented by Dr. Yannis SEMERTZIDIS on 9 Aug 2011 at 15:00
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
We report on a search for charged massive long-lived particles (CMLLPs), based on 5.2 fb$^{-1}$ of data collected with the D0 detector at the Fermilab Tevatron $p\bar{p}$ collider. CMLLPs are predicted in many theories of physics beyond the Standard Model. We look for events in which one or more particles are reconstructed as muons but have speed and ionization energy loss $dE/dx$ inconsistent ... More
Presented by Juliette ALIMENA on 12 Aug 2011 at 10:30
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
The observation of a peak in the dijet invariant mass of the Wjj signal by the CDF Collaboration has caused great excitement. We demonstrate that this peak can be explained as the same upward fluctuations CDF observes in both t-channel and s-channel single-top-quark production. A peak in the dijet spectrum is expected, because CDF used a Monte Carlo simulation to subtract the single-top backgrou ... More
Presented by Prof. Zack SULLIVAN on 9 Aug 2011 at 17:20
Type: Parallel contribution Session: Computing in HEP
Track: Computing in HEP
The PanDA Distributed Analysis system has been used in the ATLAS collaboration and beyond as a resilient and scalable distributed processing and analysis system. Using a central pull and distributed push (pilot job) model for task definition and job tracking, it integrates with many kinds of local batch system, data management software, and security models. One of the principal challenges in ma ... More
Presented by Dr. Alden STRADLING on 12 Aug 2011 at 11:10
Type: Parallel contribution Session: Computing in HEP
Track: Computing in HEP
ATLAS detector is in the second year of the LHC long run. A starting point for ATLAS physics analysis is data reconstruction. Following the prompt reconstruction, the ATLAS data is reprocessed. The reprocessing allows reconstruction of the data with improved software and updated calibrations, which provides the coherence and improves physics quality of the reconstructed data. The large-scale da ... More
Presented by Dr. Alexandre VANIACHINE on 12 Aug 2011 at 10:30
Type: Parallel contribution Session: Computing in HEP
Track: Computing in HEP
In 2010 and 2011 the ATLAS Collaboration at LHC collected a large volume of data and published a number of ground breaking papers. The Grid-based ATLAS distributed computing infrastructure played a crucial role in enabling timely analysis of the data. We will present the architecture and general features of the ATLAS distributed analysis system, and discuss the performance of the system an ... More
Presented by Dr. Sergey PANITKIN on 11 Aug 2011 at 11:00
Type: Parallel contribution Session: Detector Technology and R&D
Track: Detector Technology and R&D
Overview of plans for ATLAS detector upgrades up to 2022.
Presented by Venetios POLYCHRONAKOS on 9 Aug 2011 at 14:35
Type: Parallel contribution Session: Detector Technology and R&D
Track: Detector Technology and R&D
The ATLAS experiment is building an "Insertable B-Layer" (IBL) pixel detector to be installed on a replacement beam pipe in 2013. This detector is using the new FE-I4 pixel readout chip recently developed. The IBL will fit inside and not alter the existing ATLAS pixel detector. However, the possibility is being studied to replace the pixel whole detector in 2017 with a lower mass, higher performan ... More
Presented by Mauricio GARCIA-SCIVERES on 9 Aug 2011 at 16:40
Presented by R. Joel ENGLAND on 11 Aug 2011 at 17:00
Type: Parallel contribution Session: Particle Astrophysics and Cosmology
Track: Particle Astrophysics and Cosmology
The Large Underground Xenon (LUX) dark matter search experiment is currently being deployed at the Sanford Laboratory at Homestake in South Dakota (see Rick Gaistkell’s talk), as a precursor to DUSEL. In partnership with more international institutions, we are already thinking about the next (two) experiment(s) that will follow: LZ-S (3 t) and LZ-D (20 t). This talk describes the work accomplish ... More
Presented by Mr. David MALLING on 10 Aug 2011 at 18:10
Type: Parallel contribution Session: Computing in HEP
Track: Computing in HEP
The CMS (Compact Muon Solenoid) experiment is one of the two large general-purpose particle physics detectors built at the LHC (Large Hadron Collider) at CERN in Geneva, Switzerland. In order to meet the challenges of designing and building a detector of the technical complexity of CMS, a globally distributed collaboration has been assembled with different backgrounds, expertise, and experience. A ... More
Presented by Prof. Sudhir MALIK on 11 Aug 2011 at 10:30
Type: Parallel contribution Session: CP-Violation
Track: CP-Violation
We present an improved measurement of the charge asymmetry $A$ of like-sign dimuon events in 9 fb$^{-1}$ of $p\overline{p}$ collisions recorded with the D0 detector at a center-of-mass energy $\sqrt{s} = 1.96$ TeV at the Fermilab Tevatron collider. From $A$, we extract the like-sign dimuon charge asymmetry in semileptonic $b$-hadron decays. We also study the dependence of charge asymmetry on ... More
Presented by Bruce HOENEISEN on 9 Aug 2011 at 16:40
Type: Poster Session: Poster Session
Track: Beyond the Standard Model
Because the existence of families of elements and hadrons was ultimately understood by the realization that atoms and hadrons are composite, in the 1970's many physicists thought that the existence of the four families of leptons and quarks could be understood if leptons and quarks were composite. By the early 1980's, however, the physics community had given up on the idea because it had not been ... More
Presented by G. Bruce MAINLAND on 9 Aug 2011 at 12:30
Type: Parallel contribution Session: Field and String Theory
Track: Field and String Theory
Simple inflation models using a pseudo Nambu-Goldstone boson (PNGB) as the inflaton require an axion decay constant at or above the Planck scale. Models which generate potentially observable gravitational waves also require scalar fields with super-Planckian ranges. These models are hard to justify in UV-complete theories. One way around the problem is the phenomenon of "axion monodromy". I pr ... More
Presented by Prof. Albion LAWRENCE on 12 Aug 2011 at 16:00
Type: Parallel contribution Session: Perturbative and non-Perturbative QCD
Track: Perturbative and non-Perturbative QCD
Samples of inclusive $\gamma+{\rm 2~jet}$ and $\gamma+{\rm 3~jet}$ events collected by the D0 experiment with an integrated luminosity of about 1~fb$^{-1}$ in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV are used to measure cross sections as a function of the angle in the plane transverse to the beam direction between the transverse momentum ($p_T$) of the $\gamma+$leading jet system (jets ... More
Presented by Dmitry BANDURIN on 12 Aug 2011 at 08:00
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
We present present measurements of B and charm flavor changing neutral current processes, including inclusive and exclusive b->s gamma and B -> K nu nubar. We also present results of BABAR studies of leptonic decays of charged B and Ds mesons, in particular B -> tau nu and Ds->tau/mu nu.
Presented by Brad WRAY on 10 Aug 2011 at 16:30
Type: Parallel contribution Session: Hadron Spectroscopy
We report on latest results obtained at BABAR studying low energy e+e- annihilation, produced via initial state radiation. Hadronic cross sections are the experimental input for calculation of the muon anomalous magnetic moment, while the study of the final states and intermediate structures with unprecedented accuracy can reveal new states and their properties. In particular, an updated measure ... More
Presented by Dr. David MULLER on 12 Aug 2011 at 08:30
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
We present new results of CDF measurements of Bc and suppressed Bs decays. The first measurement of the Bc lifetime in an exclusive fully-reconstructed final state is reported. An improved measurement of the Bs->DsDs decay is reported along with a measurement of the branching ratio and lifetime for Bs->J/psif0 decays and the first measurement of a CP violating asymmetry in Bs->phiphi decays.
Presented by William WESTER on 11 Aug 2011 at 10:52
Type: Parallel contribution Session: Accelerator Physics
Track: Accelerator Physics
The plasma wakefield accelerator (PWFA) concept is experiencing renewed interest thanks to the recent experimental results that showed that ultrarelativistic electrons can gain as much as 42GeV in only 85cm of plasmas. In the PWFA a short particle bunch drives large amplitude wakefields in a neutral plasma. The wakefields can have a very large longitudinal component (>10GV/m) that leads to energy ... More
Presented by Patric MUGGLI on 12 Aug 2011 at 09:00
Type: Parallel contribution Session: Detector Technology and R&D
Track: Detector Technology and R&D
Over the course of the last decade, the Belle detector at the KEKB collider has collected over 1 ab^{-1} of integrated luminosity, allowing for a number of precision measurements of the Standard Model, including confirmation of the Kobayashi-Maskawa mechanism of CP violation. In June of 2010, KEKB and Belle were shut down to begin upgrading both the accelerator and detector. The increased luminosi ... More
Presented by James FAST on 9 Aug 2011 at 16:20
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by George REDLINGER on 9 Aug 2011 at 09:45
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by Konstantin MATCHEV on 9 Aug 2011 at 09:15
Type: Parallel contribution Session: Education and Outreach
Track: Education and Outreach
An outreach effort has started at Michigan State University to bring the physics of the LHC and the ATLAS detector to the Abrams planetarium on the MSU campus. MSU graduate and undergraduate students from Physics as well as from the College of Communication Arts & Sciences are putting together planetarium content on the LHC and its connection to astronomy, the big bang, and dark matter. I will rep ... More
Presented by Prof. Reinhard SCHWIENHORST on 10 Aug 2011 at 17:10
Type: Parallel contribution Session: CP-Violation
Track: CP-Violation
The Bs meson is studied with the CMS detector at LHC. The time-dependent measurements of the Bs decay into J/Psi Phi and of the rate of the rare decay into mu mu potentially provide indirect constraints on physics beyond the Standard Model. This talk presents the first cross section measurement for Bs->J/Psi phi production based on data taken in 2010 and discusses prospects of the lifetime ... More
Presented by Giordano CERIZZA on 10 Aug 2011 at 16:54
Type: Plenary contribution Session: Forum on Lepton Collider Physics in the LHC Era
Track: Plenary
Presented by Lucie LINSSEN on 11 Aug 2011 at 14:51
Type: Parallel contribution Session: Computing in HEP
Track: Computing in HEP
After years of development, the CMS distributed computing system is now in full operation. The LHC continues to set records for instantaneous luminosity, recording data at 300 Hz. Because of the intensity of the beams, there are multiple proton-proton interactions per beam crossing, leading to larger and larger event sizes and processing times. The CMS computing system has responded admirably to t ... More
Presented by Kenneth BLOOM on 11 Aug 2011 at 11:30
Type: Parallel contribution Session: Education and Outreach
Track: Education and Outreach
The CMS Collaboration has released more than a quarter of a million 7 TeV proton-proton events that contain pairs of muons, electrons or jets with 2-body invariant masses in the range 0 to 100 GeV for student and teacher investigations. QuarkNet and I2U2 have developed software to exploit these data in a manner similar to that of the front-line physicists: a 3-D web-based event display to understa ... More
Presented by MIke FETSKO on 10 Aug 2011 at 16:42
Type: Parallel contribution Session: Detector Technology and R&D
Track: Detector Technology and R&D
The present Compact Muon Solenoid silicon pixel tracking system has been designed for a peak luminosity of $10^{34}~\textrm{cm}^{-2} \textrm{s}^{-1}$ and total dose corresponding to two years of the Large Hadron Collider (LHC) operation. With the steady increase of the luminosity expected at the LHC, a new pixel detector with four barrel layers and three endcap disks is being designed. We will pre ... More
Presented by Prof. Neeti PARASHAR on 12 Aug 2011 at 10:30
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by Hassan JAWAHERY on 13 Aug 2011 at 09:15
Type: Parallel contribution Session: CP-Violation
Track: CP-Violation
I will review the present status of CP violating observables in low energy observables and the progress in their precision that can be expected for in the future. I will discuss what deviations from Standard Model can potentially teach us about new physics and also discuss recent hints of non-Standard Model CP violating sources in heavy quark transitions.
Presented by Jure ZUPAN on 9 Aug 2011 at 16:00
Type: Parallel contribution Session: Detector Technology and R&D
Track: Detector Technology and R&D
The ATLAS muon spectrometer is designed to measure muon momenta with a resolution of 4% @ 100 GeV/c rising to 10% @ 1 TeV/c track momentum. The spectrometer consists of precision tracking and trigger chambers embedded in a 2T magnetic field generated by three large air-core superconducting toroids. The precision detectors provide 50 micron tracking resolution to a pseudo-rapidity of 2.7. The sys ... More
Presented by Dr. Edward DIEHL on 10 Aug 2011 at 17:45
Type: Parallel contribution Session: Education and Outreach
Track: Education and Outreach
In 1980 Leon Lederman started Saturday Morning Physics with a handful of volunteer physicists, around 300 students and all the physics teachers who tagged along. Today Fermilab offers over 30 programs annually with help from 250 staff volunteers and 50 educators, and serves around 40,000 students and 2,500 teachers. Find out why we bother. Over the years we have learned to take advantage of opport ... More
Presented by Marjorie BARDEEN on 10 Aug 2011 at 17:25
Type: Plenary contribution Session: Plenary Session
Track: Plenary
For 25 years the Tevatron Proton-Antiproton Collider was the highest energy collider in the world. This presentation will trace the origins of the Tevatron, the challenges that were overcome in creating high luminosity collisions of protons and antiprotons, the technological achievements that drove performance a factor of 400 beyond the initial performance goals, and the legacy of the Tevatron in ... More
Presented by Dr. Stephen HOLMES on 13 Aug 2011 at 14:30
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by Paul GRANNIS on 13 Aug 2011 at 14:00
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
T2K (Tokai-to-Kamioka) is a long-baseline neutrino oscillation experiment designed to search for electron neutrino appearance. An intense off-axis muon neutrino beam produced at the JPARC facility in Tokai is analyzed at two locations, the first a set of detectors 280 m from the production point (ND280) and the second the Super-Kamiokande detector (SK) 295 km away. The ND280 detectors can identify ... More
Presented by Mr. Brian KIRBY on 10 Aug 2011 at 15:20
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
The NuMI Off-Axis v Appearance (NOvA) experiment is a long baseline neutrino oscillation experiment using a neutrino source created from the NuMI Beamline at Fermilab. The experiment will study the oscillations of muon neutrinos to electron neutrinos using two functionally identical plastic, liquid scintillator filled detectors placed 14 milliradians off-axis to the NuMI beam. Charged current neut ... More
Presented by Nicholas RADDATZ on 12 Aug 2011 at 08:40
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
The Simplest Higgs model is one of several Little Higgs extensions that attempt to address the hierchy problem through expansion of the Standard Model weak sector. New charged and neutral weak gauge bosons can cancel out the quadratic Higgs divergences in the Higg’s potential through loop diagrams. Production of charged X gauge bosons is studied through gauge boson fusion in pp collisions at 7 ... More
Presented by Mr. Matthew BISHARA on 11 Aug 2011 at 11:50
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
We present recent BABAR results on charmless hadronic B decays. In particular, we measure the branching fractions, longitudinal polarization fraction f_L and charge asymmetry in B -> rho(f_0) K* events, and report results of studies of B -> phi phi K and B0->K+pi-pi0. We also present the results of a recent study of the inclusive branching fractions of B-meson decays to charmless final states ... More
Presented by Brian Edward LINDQUIST on 12 Aug 2011 at 10:30
Type: Parallel contribution Session: Hadron Spectroscopy
We present a search for the X(3872) produced in B-->psi pi+pi- K and B-->psi pi+pi-pi0 K (psi=J/psi or psi(2S)) using 427 fb-1 of BaBar data. We present updated mass and width measurements for the Y(4260)--> J/psi pi+pi- produced in Initial State Radiation events using 454 fb-1 of data. We report the study of the B meson decays B+--> J/psi phi K+ and B0--> J/psi phi K_S, and of charged and ne ... More
Presented by Christopher HEARTY on 12 Aug 2011 at 16:00
Type: Parallel contribution Session: Hadron Spectroscopy
A chiral field theory of $0^{-+}$ glueball is presented. The Lagrangian of this theory is constructed by adding a $0^{-+}$ glueball field to a successful Lagrangian of chiral field theory of pseudoscalar, vector, and axial-vector mesons. The couplings between the pseodoscalar glueball field and the mesons are via U(1) anomaly revealed. Quantitative study of the physical processes of the $0^{- ... More Presented by Bing An LI on 12 Aug 2011 at 16:20 Type: Parallel contribution Session: Detector Technology and R&D Track: Detector Technology and R&D Studies carried out in the U.S., Europe, and Asia, have demonstrated the power of a pixel vertex detector in physics investigations at a future high energy linear collider. At one time, silicon CCD’s (Charged Coupled Devices) seemed like the detector elements of choice for vertex detectors for future Linear e+ e- Colliders. However, with the decision for a cold TESLA-like superconducting techno ... More Presented by Prof. Charles BALTAY on 9 Aug 2011 at 17:20 Type: Parallel contribution Session: Education and Outreach Track: Education and Outreach Since 1998, QuarkNet has provided over 500 cosmic ray muon detectors to teachers in the project and collaborators on similar projects. The detector relies on GPS accuracy for time-stamping PMT pulses from four scintillation counters. The DAQ is now in its third revision. Students and teachers use the detector to carry out small experiments to measure properties of cosmic ray muons. Other groups, m ... More Presented by Thomas JORDAN on 10 Aug 2011 at 16:55 Type: Plenary contribution Session: Plenary Session Track: Plenary Presented by Barry BARISH on 13 Aug 2011 at 15:30 Type: Parallel contribution Session: Beyond the Standard Model Track: Beyond the Standard Model We consider collider signatures of the exceptional supersymmetric standard model (E6SSM). This model is based on the SM gauge group together with an extra U(1)_{N} gauge symmetry under which right--handed neutrinos have zero charge. To ensure anomaly cancellation and gauge coupling unification the low energy matter content of the E6SSM involve three 27 representations of E_6 and a pair of SU(2 ... More Presented by Roman NEVZOROV on 11 Aug 2011 at 10:50 Type: Parallel contribution Session: Higgs Physics Track: Higgs Physics We present combined results on the search for a neutral Supersymmetric Higgs bosons with data collected at the CDF and D0 experiments. Data were collected in proton-antiproton collisions at a centre of mass energy of 1.96 TeV during Run II of the Tevatron. The searches considered cover the main production and decay mechanisms for Higgs bosons in tau and bottom quark final states. The resulting c ... More Presented by Louise SUTER on 12 Aug 2011 at 10:30 Type: Parallel contribution Session: Higgs Physics Track: Higgs Physics The combined results from CDF and D0 on direct searches for the standard model (SM) Higgs boson H in ppbar collisions at the Fermilab Tevatron at sqrt(s)=1.96 TeV are presented. Compared to the previous Tevatron Higgs search combination more data have been added, additional new channels have been incorporated, and some previously used channels have been reanalyzed to gain sensitivity. We use the l ... More Presented by Richard Edward HUGHES on 11 Aug 2011 at 11:55 Presented by Mel SHOCHET on 11 Aug 2011 at 13:10 on 12 Aug 2011 at 14:20 Type: Poster Session: Poster Session Track: Field and String Theory Lately, it is becoming increasingly clear that extending the Feynman Path Integral into the Complex domain yields desirable properties. A first hint in support of such construction can be seen from the connection between SUSY Quantum Mechanics and the Langevin dynamics: analytically continuing the Langevin leads into different SUSY Quantum Mechanical systems (which share the same algebra of ... More Presented by Dr. Daniel FERRANTE on 9 Aug 2011 at 12:32 Type: Parallel contribution Session: Computing in HEP Track: Computing in HEP Presented by Adrian POPE Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD Track: Heavy Ion Physics/Hot and Dense QCD I will show how to generate non-trivial analytic solutions to the conformally invariant, relativistic fluid dynamic equations by appealing to the Weyl covariance of the stress tensor. The technique I will present recasts the relativistic conformally invariant Navier-Stokes equations in four-dimensional Minkowski space as a static flow in three-dimensional de Sitter space times a line. The solution ... More Presented by Amos YAROM on 9 Aug 2011 at 16:25 Type: Parallel contribution Session: Neutrino Physics Track: Neutrino Physics Recent neutrino oscillation results have provoked renewed interest in sterile neutrino models. This talk will review the data from MiniBooNE, MINOS and reactor neutrinos. We incorporate these results as well as new electron neutrino disappearance data into our fits, and expand the model to address matter effects. We discuss how future experiments will resolve the questions that have been raised ... More Presented by Georgia KARAGIORGI on 12 Aug 2011 at 10:50 Type: Parallel contribution Session: Particle Astrophysics and Cosmology Track: Particle Astrophysics and Cosmology There has been much recent interest in Weakly Interacting Massive Particle (WIMP) models with masses below 10 GeV/c^2. Data from the Cryogenic Dark Matter Search (CDMS II) have been reanalyzed to give increased sensitivity to these models. Using a lowered, 2 keV recoil energy threshold, we have reanalyzed data from eight germanium detectors operated at the Soudan Underground Laboratory, and used ... More Presented by Scott HERTEL on 10 Aug 2011 at 17:10 Type: Parallel contribution Session: Neutrino Physics Track: Neutrino Physics Recent observation of a potential a deficit in the anti-neutrino flux measurement at reactor experiments may suggest the possibility of sterile neutrino species with up to eV^2 mass-square scale. The upward neutrinos at the IceCube/DeepCore observatory provide an ideal test of the sterile neutrinos, as the very long distance through the Earth and matter effect allow the sterile species significant ... More Presented by Yu GAO on 12 Aug 2011 at 11:50 Type: Parallel contribution Session: Neutrino Physics Track: Neutrino Physics MINOS searches for neutrino oscillations using the disappearance of muon neutrinos between two detectors, over a baseline of 735 km. We recently reported the most precise measurement of neutrino oscillations in the atmospheric sector and the first tagged measurement of antineutrino oscillations. The neutrino mass splitting and mixing angle are measured to be$|\Delta m^{2}| = 2.32_{-0.08}^{+0.12 ... More
Presented by Zeynep ISVAN on 9 Aug 2011 at 16:00
Type: Parallel contribution Session: Particle Astrophysics and Cosmology
Track: Particle Astrophysics and Cosmology
The Telescope Array (TA) is the largest ultrahigh energy (UHE) cosmic ray observatory in the northern hemisphere. TA is a hybrid experiment with a unique combination of fluorescence detectors and a stand-alone surface array of scintillation counters. We will present the spectrum measured by the surface array alone, along with those measured by the fluorescence detectors in monocular, hybrid, and ... More
Presented by Prof. Charles JUI on 11 Aug 2011 at 12:10
Type: Parallel contribution Session: Particle Astrophysics and Cosmology
Track: Particle Astrophysics and Cosmology
The Cryogenic Dark Matter Search (CDMS) experiment and its successor, SuperCDMS, use solid-state detectors operated near 40 mK to search for Weakly Interacting Massive Particles (WIMPs). The experiment measures the ionization and athermal phonons from particle interactions to discriminate WIMP candidate events (nuclear recoils) from background events (electron recoils) with very high efficiency. T ... More
Presented by Dr. Oleg KAMAEV on 12 Aug 2011 at 08:00
Presented by Dr. Michael PROCARIO on 10 Aug 2011 at 13:15
Type: Parallel contribution Session: Particle Astrophysics and Cosmology
Track: Particle Astrophysics and Cosmology
The channeling effect in crystals refers to the orientation dependence of charged ion penetration in crystals. In direct dark matter crystalline detectors, a channeled ion recoiling after a collision with a WIMP gives all its energy to electrons. Thus channeling increases the ionization or scintillation signal expected from a WIMP. Channeling is a directional effect which depends on the velocity d ... More
Presented by Ms. Nassim BOZORGNIA on 12 Aug 2011 at 09:40
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by Jonghee YOO on 11 Aug 2011 at 09:30
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
The NuMI Off-Axis $\nu_{e}$ Appearance (NO$\nu$A) project is a long-baseline neutrino experiment. It utilizes the NuMI neutrino beam at Fermilab and consists of two functionally-identical plastic, scintillator-filled detectors placed 14 milliradians off-axis from the beam and 810 km apart. A 209 ton prototype detector, the Near Detector On the Surface(NDOS), was built and began taking initial neut ... More
Presented by Susan LEIN on 12 Aug 2011 at 08:00
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
The discovery of neutrino oscillation, as a breakthrough in particle physics, motivated the Daya Bay Neutrino Experiment, which is designed to make a precise measurement of the last unknown neutrino mixing angle theta13, with a sensitivity 0.01 for sin^2(2*theta13), using reactor anti-neutrino from 17.4GW Daya Bay Nuclear Power Plant located in Shenzhen, China. This talk will introduce the goal of ... More
Presented by Dr. Zhe WANG on 9 Aug 2011 at 17:00
Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD
Track: Heavy Ion Physics/Hot and Dense QCD
I am going to discuss new lattice results on the deconfinement and chiral aspects of the transition in QCD at non-zero temperature. I will report on calculations performed using the Improved Staggered Quark action on Nt=6, 8 and 12 lattices. I will show continuum extrapolation for several quantities that are discussed in connection with the transition at non-zero temperature as well as the ... More
Presented by Peter PETRECZKY on 9 Aug 2011 at 14:00
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
In this talk, I will discuss the production of fourth generation quarks at the LHC. In particular, if such a quark has a mass in the phenomenologically interesting range of 400GeV-600 GeV and decays to a light quark and a W-boson, I will consider a number of possible signals through which it might be detected. In general, the signals I consider include missing momentum together with jets and ... More
Presented by Dr. David ATWOOD on 11 Aug 2011 at 11:10
Type: Parallel contribution Session: Electroweak Physics
Track: Electroweak Physics
We present measurements of the production cross sections for W/Z+gamma and W/Z+Z boson pairs using up to 8.6 fb-1 of ppbar collisions recorded with the D0 detector at the Fermilab Tevatron collider. In addition to comparing the total cross section measurements with the QCD predictions, we investigate differential distributions and set limits on possible anomalous couplings in the triple gauge boso ... More
Presented by Michael COOKE on 12 Aug 2011 at 11:30
Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD
Track: Heavy Ion Physics/Hot and Dense QCD
Measurements of charged dihadron correlations from the CMS collaboration are presented for PbPb collisions at a center-of-mass energy of 2.76 TeV per nucleon pair over a broad range of pseudorapidity and the full range of azimuthal angle. With its large pseudorapidity coverage, the CMS tracker is ideally suited for detailed analyses of both short and long-range charged hadron correlations at the L ... More
Presented by Yuting BAI on 10 Aug 2011 at 15:15
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
Top-antitop pairs produced in the decay of a new heavy resonance will exhibit spin correlations that contain valuable coupling information. When the tops decay, these correlations imprint themselves on the angular patterns of the final quarks and leptons. I will discuss how to probe the structure of a resonance's couplings to tops by measuring the azimuthal angles of the tops' decay products abo ... More
Presented by Brock TWEEDIE on 10 Aug 2011 at 17:10
Type: Parallel contribution Session: Accelerator Physics
Track: Accelerator Physics
Of the various advanced accelerator schemes that promise high accelerating gradients, optical-scale structures offer a distinct set of performance parameters along with their own challenges. In addition to the promise of an order of magnitude improvement in accelerating gradients (to ~GV/m) over conventional structures, these devices produce low charge, femto- to atto-second bunches at very high r ... More
Presented by Dr. Gil TRAVISH on 9 Aug 2011 at 16:30
Presented by Tatsuya NAKADA on 11 Aug 2011 at 16:40
Type: Parallel contribution Session: Low Energy Searches for Physics Beyond the Standard Model
Track: Low Energy Searches for Physics Beyond the Standard Model
The Electric Dipole Moments (EDMs) provide an unique way of probing CP violations. The search for neutron and atom EDMs has reached very high precision after many decades of effort. I will discuss the implications of the EDM search on the theory of SM, SUSY, as well as the Baryogenesis scenarios. In particular, based on the study of the interplay of EDMs and electroweak Baryogenesis in MSSM, we le ... More
Presented by Dr. Yingchuan LI on 9 Aug 2011 at 14:40
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
NOvA is a long baseline neutrino experiment using an off-axis neutrino beam produced by the NuMI neutrino beam at Fermilab. The NOVA experiment will study neutrino oscillations from $\nu_{\mu}$ flavor to $\nu_e$ flavor. A short term goal for the NOvA experiment is to develop a good understanding of the response of the detector. These studies are being carried out with the full Near Detector insta ... More
Presented by Minerba BETANCOURT on 11 Aug 2011 at 11:10
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by Mark TRODDEN on 11 Aug 2011 at 09:00
Type: Parallel contribution Session: Education and Outreach
Track: Education and Outreach
The Deep Underground Science and Engineering Laboratory (DUSEL) – proposed for the site of the former Homestake Goldmine in Lead, SD – will provide the facility and infrastructure for scientists to study some of the most compelling questions about the history and fate of our universe through its major experiments searching for direct evidence of dark matter and exploring the nature of neutrino ... More
Presented by Margaret NORRIS on 9 Aug 2011 at 16:30
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by Michael BARNETT on 10 Aug 2011 at 12:00
Type: Parallel contribution Session: Education and Outreach
Track: Education and Outreach
Gravitational waves are produced by some of the most energetic and dramatic phenomena in the Universe: Black holes, neutron stars and supernovae. As powerful as they are are at their sources, gravitational waves are incredibly elusive by the time they reach the Earth. Although gravitational waves were predicted almost a century ago (as a consequence of General Relativity), they still have not bee ... More
Presented by Dr. Marco CAVAGLIA on 9 Aug 2011 at 16:00
Type: Parallel contribution Session: Education and Outreach
Track: Education and Outreach
The scale and scope of the physics studied at the Auger Observatory offer significant opportunities for original outreach work. Education, outreach and public relations of the Auger collaboration are coordinated in a separate task whose goals are to encourage and support a wide range of education and outreach efforts that link schools and the public with the Auger scientists and the science of cos ... More
Presented by Prof. Gregory SNOW on 9 Aug 2011 at 16:45
Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD
Track: Heavy Ion Physics/Hot and Dense QCD
We revisit the jet broadening and radiative energy loss problems in heavy ion collisions from effective theory point of view. Soft collinear effective theory (SCET) describes the dynamics of QCD at high energies and is particularly suitable for calculations involving jets. By modifying its Lagrangian to include medium interactions we develop an effective theory for jets in medium. A number of issu ... More
Presented by Dr. grigory OVANESYAN on 11 Aug 2011 at 11:30
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
Identification of jets originating from b quarks (b-tagging) is a key element of many physics analyses at the LHC. Various algorithms for b-tagging have been developed by the CMS experiment to identify b-tagged jets with a typical efficiency between 40% and 70% while keeping the rate of mis-identified light quark jets between 0.1% and 10%. An important step, in order to be able to use these tools ... More
Presented by Saptaparna BHATTACHARYA on 10 Aug 2011 at 14:20
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
The Main Injector Neutrino Oscillation Search (MINOS) is a long-baseline neutrino experiment that utilizes Fermilab’s NuMI beam and two steel-scintillator calorimeters. Designed to search for νµ disappearance, MINOS provides an opportunity to study νe appearance as well. Analysis methods developed by the MINOS νe group have facilitated the placement of limits upon the mixing angle associated ... More
Presented by Mr. Adam SCHRECKENBERGER on 9 Aug 2011 at 15:15
Type: Plenary contribution Session: Forum on Lepton Collider Physics in the LHC Era
Track: Plenary
Presented by Jonathan BAGGER on 11 Aug 2011 at 14:05
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
I will present strategies used to separate electron signatures from tau lepton signatures with the ATLAS detector, one of the general purpose detectors on the LHC ring at CERN. Taus can decay leptonically, to electrons or muons and neutrinos, or hadronically, to a number of neutral and charged hadrons and neutrinos. These decays happen before the taus reach the inner-most layer of the detector, th ... More
Presented by Ms. Susie BEDIKIAN on 10 Aug 2011 at 15:00
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
Promising ways to search for New Physics effects in radiative penguin decays are in the angular analysis of $B^0 \to K^{*} \mu^+\mu^-$, in the measurement of direct CP violation in $B^0 \to K^{*} \gamma$ and a time dependent analysis of $B^0_s \to \phi \gamma$. All of these studies are being pursued at LHCb. First results will be shown from the 2010 and early 2011 data, with particular e ... More
Presented by Thomas BLAKE on 10 Aug 2011 at 17:10
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by Michael Henry SCHMITT on 9 Aug 2011 at 08:45
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
I will provide a concise, coherent overview of electroweak symmetry breaking from a modern perspective, focusing on models that contain a naturally light higgs boson. In particular, I will review theories with supersymmetry and those in which the higgs field is a pseudo-Nambu-Goldstone boson.
Presented by Prof. Takemichi OKUI on 10 Aug 2011 at 14:35
Type: Parallel contribution Session: Accelerator Physics
Track: Accelerator Physics
Few representative experimental results from a 20 year old history of the dedicated advanced accelerator R&D user facility will start the presentation. Evolution of the facility, its current capabilities and experimental program will be discussed in details. Monoenergetic Ion beam generation in laser plasma interaction and observation of Coherent Synchrotron Radiation suppression with shielding pl ... More
Presented by Dr. vitaly YAKIMENKO on 9 Aug 2011 at 16:00
Presented by Dr. Pier ODDONE on 10 Aug 2011 at 12:35
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by Christopher HERZOG on 10 Aug 2011 at 08:30
Type: Parallel contribution Session: CP-Violation
Track: CP-Violation
We report the first measurement of branching fractions and CP-violating asymmetries of doubly-Cabibbo suppressed B+ --> D0 K decays in hadron collisions, using the approach proposed by Atwood, Dunietz, and Soni (ADS) to determine the CKM angle gamma in 7.0 fb-1 of data. The ADS parameters are determined with accuracy comparable with B factory measurements.
Presented by Paola GAROSI on 11 Aug 2011 at 10:30
Type: Parallel contribution Session: Perturbative and non-Perturbative QCD
Track: Perturbative and non-Perturbative QCD
Events with two isolated photons are a useful probe of hard-scattering QCD. Also, uncertainty in sigma(diphoton + X) is a major source of systematic error for Higgs and exotic diphoton searches. We present the first measurement of the isolated differential diphoton cross-section from proton-proton collisions at a center-of-mass energy of 7 TeV with the Compact Muon Solenoid detector at CERN. We co ... More
Presented by Laurent MILLISCHER on 11 Aug 2011 at 10:50
Type: Parallel contribution Session: Hadron Spectroscopy
We report the observation of the h_b(1P) and h_b(1P)p spin-singlet bottomonium states produced in the reaction e^+e^-\to h_b(1P)n\pi^+\pi^- with significances of 5.5\,\sigma and 11.2\,\sigma, respectively. We find that M[h_b(1P)]=(9898.25\pm 1.06^{+1.03}_{-1.07})\,\mathrm{MeV}/c^2 and M[h_b(1P)p]=(10259.76\pm0.64^{+1.43}_{-1.03})\,\mathrm{MeV}/c^2, which correspond to measurements of the P-wave hy ... More
Presented by Dr. David ASNER on 12 Aug 2011 at 08:50
Type: Parallel contribution Session: Detector Technology and R&D
Track: Detector Technology and R&D
In order to exploit fully the physics potential of future lepton colliders, highly precise tracking systems will be needed, for which systematic alignment uncertainties must be small. We describe ongoing R&D in frequency scanned interferometry (FSI) to be applied to alignment monitoring of a detector's charged particle tracking system, in addition to its beam pipe and final-focus quadrupole m ... More
Presented by Dr. Haijun YANG on 10 Aug 2011 at 18:05
Type: Parallel contribution Session: Field and String Theory
Track: Field and String Theory
We discuss a mathematically precise realization of suggestions of a holographic duality relating fluids and spacetime horizons which began with the black hole membrane paradigm in the 70's and resurfaced recently in studies of the AdS/CFT correspondence. Our explicit construction shows that every solution of the incompressible Navier-Stokes equation can be related to a solution of the vacuum Eins ... More
Presented by Ms. Irene BREDBERG on 12 Aug 2011 at 16:20
Type: Parallel contribution Session: Accelerator Physics
Track: Accelerator Physics
The dielectric laser acceleration (DLA) concept leverages well-established industrial fabrication capabilities and the commercial availability of tabletop lasers to reduce cost, while offering significantly higher accelerating gradients, and therefore a smaller footprint. In contrast to other novel accelerator schemes, desirable luminosities would be obtained by operating with very low charge per ... More
Presented by Dr. Robert BYER on 12 Aug 2011 at 08:30
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by Dr. Pier ODDONE on 13 Aug 2011 at 15:00
Type: Parallel contribution Session: Field and String Theory
Track: Field and String Theory
We describe a novel regulator of four-dimensional N = 4 Super Yang-Mills theory on a four-sphere. The regulator involves a lift of the theory to a large N matrix model on a non-commutative twistor space. As opposed to other known regulators, this regulator naturally retains both gauge invariance, and the symmetries of the spacetime. We present evidence that in the large N limit, the twistor matrix ... More
Presented by Dr. Jonathan HECKMAN on 10 Aug 2011 at 15:10
Type: Parallel contribution Session: Education and Outreach
Track: Education and Outreach
The combination of cutting-edge discovery science with the exotic Antarctic environment provides an ideal vehicle to excite and engage a wide audience. Examples of how the International IceCube Collaboration has brought the Universe to the classroom and the general public via the South Pole will be presented.
Presented by Dr. James MADSEN on 9 Aug 2011 at 16:15
Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD
Track: Heavy Ion Physics/Hot and Dense QCD
In recent years holography has emerged as a powerful tool to study non-equilibrium phenomena in certain quantum theories, mapping challenging quantum dynamics onto the classical dynamics of gravitational fields in one higher dimension. One interesting process accessible with holography is the formation of a quark-gluon plasma in strongly coupled non-Abelian gauge theories. In the dual gravitatio ... More
Presented by Paul CHESLER on 11 Aug 2011 at 10:30
Presented by Prof. Gregory SNOW on 11 Aug 2011 at 16:50
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by Adam SZCZEPANIAK on 10 Aug 2011 at 10:30
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by Prof. Sheldon STONE on 13 Aug 2011 at 08:45
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by Barbara JACAK on 10 Aug 2011 at 11:30
Type: Parallel contribution Session: Education and Outreach
Track: Education and Outreach
The HiSPARC project is a high school cosmic ray project that originated in the Netherlands. The aim of this project is to have high school students participate in building and running a scientific project, thereby increasing their enthusiasm for science in general. We are experimenting with different detector configurations, performing a calibration on the KASCADE site, and exploring the physics o ... More
Presented by Dr. Charles TIMMERMANS on 9 Aug 2011 at 17:00
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
Theoretical knowledge of the low transverse momentum (pT) distribution of the Higgs boson, plays an important role in search strategies for the Higgs. In the region of low pT, much smaller than the Higgs mass, large logarithms spoil the perturbative expansion and must be resummed. We apply effective field theory techniques and derive a new factorization and resummation formula for the pT-spectrum ... More
Presented by Dr. Sonny MANTRY on 12 Aug 2011 at 09:42
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
We explore LHC signatures of vectorlike quarks, which are hypothetical fermions whose left- and right-handed components have the same electroweak quantum numbers. We consider interactions of such a quark, top-prime, with the top quark via a Yukawa coupling and with a bottom quark through a $W$ boson. We look at Higgs production through the decay of the top-prime in a top-prime pair production chan ... More
Presented by Ms. Saptaparna BHATTACHARYA on 11 Aug 2011 at 11:30
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by Aurelio JUSTE ROZAS on 13 Aug 2011 at 11:30
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
In this talk I will present a factorization theorem for the Higgs transverse momentum spectrum using SCET (Soft Collinear Effective Theory). This theorem allows us systematically resum large logarithms of $p_T$ in the regime $m_h \gg p_T \gg \Lambda_{QCD}$. The transverse momentum distributions of Higgs produced via gluon fusion will be presented and compared to previous results derived usin ... More
Presented by Dr. Jui-Yu CHIU on 10 Aug 2011 at 17:33
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by John BEACOM on 11 Aug 2011 at 08:30
Type: Parallel contribution Session: Accelerator Physics
Track: Accelerator Physics
Research on the basic physics of high-gradient, high frequency accelerator structures and the associated RF/microwave technology are essential for the future of discovery science, medicine and biology, energy and environment, and national security. We will review the state-of-the-art for the development of high gradient linear accelerators.
Presented by Prof. Sami TANTAWI on 10 Aug 2011 at 16:30
Type: Parallel contribution Session: Accelerator Physics
Track: Accelerator Physics
Neutrino physics from muon decay is very much at the forefront of today's physics research. Large detectors installed in deep underground locations perform neutrino mass, CP violation, and oscillation studies using long- and short-baseline beams of neutrinos from muons decaying in flight. DAEdALUS looks at neutrinos from stopped muons, “Decay At Rest (DAR)” neutrinos. The DAR neutrino spectrum ... More
Presented by Jose ALONSO on 10 Aug 2011 at 18:00
Type: Parallel contribution Session: Accelerator Physics
Track: Accelerator Physics
The Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory has now operated for a decade. Over this time the 2 physics programs at RHIC, based on heavy ion and polarized proton collisions respectively, have seen a substantial increase in performance and a variety of operating modes. The performance increases are presented with the dominant limiting effects, and upgrade plans for ... More
Presented by Dr. Wolfram FISCHER on 9 Aug 2011 at 14:30
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
The MINERvA detector, operating since 2009 in the NuMI beam line at Fermilab, has collected neutrino and antineutrino scattering data on a variety of nuclear targets. The detector is designed to identify events originating in plastic scintillator, lead, carbon, iron, water, and liquid helium. The goals of the experiment are to measure precisely inclusive and exclusive cross sections for neutrino ... More
Presented by Dr. Aaron MCGOWAN on 10 Aug 2011 at 14:40
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
The LHC is a top factory: in the SM about 8,000 top pairs should have been produced with more than 47 pb−1 integrated luminosity already taken per detector at 7 TeV. Since the LHC center-of-mass energy is high compared to the top mass, the tops will typically be highly boosted, so that the decay products are close to each other. Thus, in the detector, at first sight, the top decay products may l ... More
Presented by Ms. Peisi HUANG on 10 Aug 2011 at 16:30
Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD
Track: Heavy Ion Physics/Hot and Dense QCD
Azimuthal angle correlations of charged hadrons were measured in $\sqrt s_{NN}$ = 2.76 TeV Pb+Pb collisions by the CMS experiment. The distributions exhibit anisotropies that are correlated with the event-by-event orientation of the reaction plane. Several methods were employed to extract the strength of the signal: the event-plane, cumulant and Lee-Yang Zeros methods. These methods have different ... More
Presented by Charles Felix MAGUIRE on 9 Aug 2011 at 16:00
Type: Plenary contribution Session: Forum on Lepton Collider Physics in the LHC Era
Track: Plenary
Presented by Andrew WHITE on 11 Aug 2011 at 14:28
Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD
Track: Heavy Ion Physics/Hot and Dense QCD
The current focus at RHIC is the Beam Energy Scan (BES) program to study the QCD phase diagram --- temperature ($T$) vs. baryon chemical potential ($\mu_B$). The BES program aims to verify some predictions from QCD: that a cross-over occurs at $\mu_B$ = 0, and that there exists a first-order phase transition at large $\mu_B$ and a critical point at an intermediate $\mu_B$. The spectra ... More
Presented by Dr. lokesh KUMAR on 9 Aug 2011 at 14:55
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
We explore methods for improving the top quark forward-backward asymmetry measurement at the LHC. We identify variables which distinguish top pairs produced from gluons versus quarks. These variables include the top quark rapidity, mass and rapidity of the top-antitop system, the top quark polarization and the top-antitop spin correlation. We obtain the best axes for measuring the top quark polari ... More
Presented by Zhenyu HAN on 11 Aug 2011 at 11:10
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
We present an inclusive search for events with two isolated leptons ($e$ or $\mu$) of the same electric charge in $pp$ collisions at $\sqrt{s}=7$ TeV. The data are selected from events recorded in the ATLAS detector in 2011. With a small Standard Model background, the same sign dilepton signature is a powerful testing ground for new physics. The distributions of kinematical variables are presented ... More
Presented by Mr. Benjamin CERIO on 10 Aug 2011 at 17:10
Type: Poster Session: Poster Session
Track: Field and String Theory
We study the interparticle potentials for few-particle systems in a scalar theory with a non-linear mediating field of the Higgs type. We use the variational method, in a reformulated Hamiltonian formalism of QFT, to derive relativistic three and four particle wave equations for stationary states of these systems. We show that the cubic and quartic non-linear terms modify the attractive Yukawa pot ... More
Presented by Mr. Alexander CHIGODAEV on 9 Aug 2011 at 12:31
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
We present the status of interpretations of Supersymmetry searches in ATLAS using simplified models. Such models allow a systematic scan through the phase space in the sparticle mass plane, and in the corresponding final state kinematics. Models at various levels of simplification have been studied in ATLAS. The results can be extrapolated to more general new physics models which lead to the ... More
Presented by Hideki OKAWA on 9 Aug 2011 at 17:40
Presented by Patricia MCBRIDE on 11 Aug 2011 at 16:30
Presented by Young-Kee KIM
Type: Parallel contribution Session: Perturbative and non-Perturbative QCD
Track: Perturbative and non-Perturbative QCD
We present results on the measurement of hadronic jet event shapes and jet substructure in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector. These measurements constitute the first dedicated study of hadronic event shapes at high Q^2 in ATLAS. New results are also presented on the measurement of the substructure of these jets and in commissioning the tools for distinguishing the ... More
Presented by David MILLER on 9 Aug 2011 at 14:30
Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD
Track: Heavy Ion Physics/Hot and Dense QCD
I will present an overview of recent results on jets and jet-like correlation measurements from the Relativistic Heavy-Ion Collider (RHIC) at Brookhaven National Laboratory. Jets are produced in the initial hard scatterings of an event and can therefore be exploited as probes of the hot and dense medium produced in heavy-ion collisions. Previous RHIC results indicate that this medium, the Qu ... More
Presented by Helen Louise CAINES on 10 Aug 2011 at 16:30
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
The KArlsruhe TRItium Neutrino (KATRIN) experiment is a next generation, model independent, large scale experiment to determine the mass of the electron anti-neutrino by investigating the kinematics of tritium beta-decay with a sensitivity of 200 meV/c2. The measurement setup consists of a high luminosity windowless gaseous molecular tritium source (WGTS), a differential and cryogenic pumped elect ... More
Presented by Dr. Florian FRäNKLE on 12 Aug 2011 at 09:00
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by Dr. Steve MYERS on 13 Aug 2011 at 12:00
Type: Parallel contribution Session: Perturbative and non-Perturbative QCD
Track: Perturbative and non-Perturbative QCD
We investigate the potential to observe double parton scattering at the LHC in the W b bbar -> e nu b bbar process. Double parton scatterings occur when two partons inside the same hadron each undergo a high scale interaction with two partons of another hadron. The rate for this process is expected to be approximated by the product of the usual single parton distribution functions with appropria ... More
Presented by Seth QUACKENBUSH on 12 Aug 2011 at 09:20
Type: Parallel contribution Session: Field and String Theory
Track: Field and String Theory
We will present new results pertaining to large Nc gauge on the lattice. Two main topics will be (a) the phases of three dimensional large Nc gauge theories reduced to two dimensions; (b) single site realization of large Nc gauge theories with adjoint fermions.
Presented by Rajamani NARAYANAN on 10 Aug 2011 at 15:30
Type: Parallel contribution Session: CP-Violation
Track: CP-Violation
The role of lattice matrix elements in refined tests of the Standard Model and for search of new physics will be discussed. Although the results from the lattice in conjunction with data from B-factories provided a confirmation of the CKM-paradigm of CP violation a few years ago, since then improved calculations and better data from experiments is now yielding strong indications that the singl ... More
Presented by Amarjit SONI on 10 Aug 2011 at 16:30
Type: Plenary contribution Session: Forum on Lepton Collider Physics in the LHC Era
Track: Plenary
Presented by Prof. Jonathan FENG on 11 Aug 2011 at 14:00
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by KRISHNA RAJAGOPAL on 10 Aug 2011 at 11:00
Type: Parallel contribution Session: Field and String Theory
Track: Field and String Theory
Einstein's theory of General Relativity and its couplings to matter in 3+1 dimensions can be slightly enlarged with the requirement of a local scale (conformal) symmetry and the corresponding gauge degrees of freedom. This form of the theory, which is a prediction coming from 2T-gravity in 4+2 dimensions, has no dimensionful constants, not even the gravitational constant, and requires all scalar f ... More
Presented by Itzhak BARS on 12 Aug 2011 at 11:30
Type: Parallel contribution Session: CP-Violation
Track: CP-Violation
The CP asymmetry in inclusive b-> s gamma decays is an important probe of new physics. The theoretical prediction was thought to be of a perturbative origin. In the standard model the perturbative prediction for the asymmetry is about 0.5 percent. In a recent work with M. Benzke, S.J. Lee and M. Neubert , we have shown that the asymmetry is in fact dominated by non-perturbative effects. Since the ... More
Presented by Dr. gil PAZ on 10 Aug 2011 at 18:06
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
The bicycle model of Lorentz noninvariant neutrino oscillations without neutrino masses naturally predicts maximal mixing and a 1/E dependence of the oscillation argument for muon-neutrino to tau-neutrino oscillations of atmospheric and long-baseline neutrinos, but cannot also simultaneously fit the data for solar neutrinos and KamLAND. We search for other possible structures of the effective Ha ... More
Presented by Prof. Kerry WHISNANT on 11 Aug 2011 at 11:50
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
Super-Kamiokande is sensitive to neutrino interactions between 4 and 100MeV via elastic scattering and inverse beta decay. I will present Super-Kamiokande's ongoing measurements of solar neutrinos and its searches for supernova neutrinos.
Presented by Dr. Michael SMY on 9 Aug 2011 at 14:20
Type: Parallel contribution Session: Education and Outreach
Track: Education and Outreach
The MARIACHI initiative involves a community with diverse academic backgrounds to explore forefront science. We focus on the study of cosmic rays. Our flagship theme has been the development of a new technology for the detection of cosmic rays, namely forward scattering radar. Over the years many other research subjects have been added to the list of our interests and they are now in various stage ... More
Presented by Dr. Helio TAKAI on 9 Aug 2011 at 17:15
Type: Parallel contribution Session: Accelerator Physics
Track: Accelerator Physics
The muon ionization cooling experiment (MICE) is a strategic R&D project intending to demonstrate the only practical solution to prepare high brilliance beams necessary for a neutrino factory or muon colliders. MICE is under development at the Rutherford Appleton Laboratory (UK). It comprises a dedicated beam line to generate a range of input emittance and momentum, with time-of-flight and Cherenk ... More
Presented by Ulisse BRAVAR on 11 Aug 2011 at 10:30
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
MINOS is a long-baseline neutrino oscillation experiment which started commissioning in 2005. MINOS has provided many physics opportunities in the past few years. It has made best measurement of $\Delta m^{2}_{32}$ and made the first measurement of $\Delta \bar{m}^{2}_{32}$. MINOS also set the most stringent limit to the fraction of active neutrinos transition to sterile neutrinos. MINOS made atte ... More
Presented by Dr. Xiaobo HUANG on 9 Aug 2011 at 14:40
Type: Parallel contribution Session: Field and String Theory
Track: Field and String Theory
An on-shell formalism for the computation of S-matrices of SYM theories in three spacetime dimensions will be presented. The framework is a generalization of the spinor-helicity formalism in four dimensions. The formalism will be applied to establish the manifest SO(N) covariance of the on-shell superalgebra relevant to N =2,4 and 8 SYM theories in d=3. The results will be used to argue for the ... More
Presented by Dr. Abhishek AGARWAL on 10 Aug 2011 at 14:30
Type: Parallel contribution Session: CP-Violation
Track: CP-Violation
We report a new measurement of the $CP$-violating phase $\phi_s$, of the decay width difference for the two mass eigenstates $\Delta \Gamma_s$, of the mean $B^0_s$ lifetime $\overline{\tau}_s$, and of magnitudes of the decay amplitudes, from the flavor-tagged decay $B^0_s\to J/\psi \phi$. For the first time, we consider possible contributions from the decay $B^0_s \rightarrow J/\psi K^+K^-$, with ... More
Presented by Dr. Avdhesh CHANDRA on 10 Aug 2011 at 17:42
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
The measurement of J/psi and Υ production cross section in proton-proton collisions at √s = 7 TeV is presented using a data sample collected with the CMS detector at the LHC. We also report the measurement of the ratio of X(3872) and psi(2S) signal yields.
Presented by Yu ZHENG on 9 Aug 2011 at 14:22
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
We use 2011 data from the ATLAS detector to isolate the production of single-top quarks. This electroweak top-quark production is expected to be sensitive to new physics such as flavor changing neutral currents or W' production, and can also be an important background for processes like the Higgs boson production. The data for this analysis are collected from collisions occurring at 7 TeV center ... More
Presented by Jenny HOLZBAUER on 10 Aug 2011 at 15:00
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
The top quark can be used as a probe of new physics, particularly when it decays into non-SM particles. One promising example is the decay of a top quark into a charged Higgs boson and b-quark. Charged Higgs bosons occur naturally in extended Higgs sectors and for a wide range of models can decay nearly exclusively into a tau lepton and a neutrino. In this talk, we summarize the searches for tau ... More
Presented by Allison MCCARN on 9 Aug 2011 at 16:20
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
The top quark was discovered at the CDF and D0 experiments in 1995.Its properties within the Standard Model are fully defined. The measurement of the top quark mass and the verification of the expected properties have been an important topic of experimental top quark physics since. We will present the recent measurements of top quark properties in CDF.
Presented by Zhenbin WU on 10 Aug 2011 at 14:40
Type: Parallel contribution Session: Electroweak Physics
Track: Electroweak Physics
We report the measurements of the rates and asymmetries of inclusive and differential production of W and Z vector bosons in pp collisions at 7 TeV c.m. energy at the CMS detector.
Presented by Ji Yeon HAN on 9 Aug 2011 at 17:00
Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD
Track: Heavy Ion Physics/Hot and Dense QCD
The flow harmonics $v_n$ are important bulk observables in heavy ion collisions. They contain information about the initial geometry as well as the transport properties of the medium produced in heavy ion collisions. We present the measurements of flow harmonics $v_2$-$v_6$ using the EP method and two particle correlations method in broad $p_T$, $\eta$ and centrality ranges using the ATLAS detecto ... More
Presented by Mr. Soumya MOHAPATRA on 9 Aug 2011 at 16:50
Type: Parallel contribution Session: Perturbative and non-Perturbative QCD
Track: Perturbative and non-Perturbative QCD
Inclusive multi-jet production is studied using the ATLAS detector for proton-proton collisions with a center-of-mass energy of 7 TeV. The data sample corresponds to an integrated luminosity of 2.43 pb^-1, using the first proton-proton data collected by the ATLAS detector in 2010. Results on multi-jet cross sections are presented and compared to both leading-order plus parton-shower Monte Carlo pr ... More
Presented by Dr. Matthew Cleary TAMSETT on 10 Aug 2011 at 14:20
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
We present a measurement of the inclusive single top production cross section in proton-proton collisions at the LHC at a centre-of-mass energy of 7 TeV, using data collected with the CMS experiment during the year 2011. The analysis considers decay channels where the W from the top decays into electron-neutrino or muon-neutrino, and makes use of kinematic characteristics of electroweak single top ... More
Presented by Dr. Thomas SPEER on 10 Aug 2011 at 14:00
Type: Parallel contribution Session: CP-Violation
Track: CP-Violation
We present the first evidence for B->D K, D->K^+ pi^- and measurements of related observables used in the Atwood-Dunietz-Soni (ADS) method to determine the CKM parameter phi_3 (also known as gamma). Measurement of related B->D^* K^- modes are also reported. We report the first measurement of phi_3 using model-independent analysis of the Dalitz plot of B->D K, D->K_S^0 pi^+ pi^-. These resul ... More
Presented by Leo PIILONEN on 12 Aug 2011 at 16:00
Type: Parallel contribution Session: Perturbative and non-Perturbative QCD
Track: Perturbative and non-Perturbative QCD
The production of prompt photon pairs with large invariant mass in hadron collisions is a large irreducible background in searches for a low mass Higgs boson decaying into a photon pair, as well as in searches for new phenomena, such as new heavy resonances, extra spatial dimensions or cascade decays of heavy new particles. Precise measurements of the diphoton production differential cross section ... More
Presented by Dr. Costas VELLIDIS on 11 Aug 2011 at 10:30
Type: Parallel contribution Session: Perturbative and non-Perturbative QCD
Track: Perturbative and non-Perturbative QCD
The study of final states with an isolated high energy photon and an identified b-quark jet is a testing ground for QCD predictions at the hadron collider. A cross section measurement provides a probe of the hard scattering dynamics within the proton, and a cross-check of the predictions of its b-quark content, whose parton density function is indirectly extracted from constraints on the gluon den ... More
Presented by Mr. Tingjun YANG on 11 Aug 2011 at 11:30
Type: Parallel contribution Session: Electroweak Physics
Track: Electroweak Physics
We present a measurement of the Drell-Yan differential cross section in pp collisions as a function of the dilepton invariant mass (dsigma/dm). The data sample was collected by the CMS detector at the LHC operating at a center-of-mass energy of 7 TeV during 2010 and 2011. The results are compared to predictions of the Standard Model.
Presented by Stoyan Emilov STOYNEV on 9 Aug 2011 at 15:00
Type: Parallel contribution Session: Low Energy Searches for Physics Beyond the Standard Model
Track: Low Energy Searches for Physics Beyond the Standard Model
The Qweak experiment at Jefferson Lab measures the parity violating asymmetry of polarized electrons scattering of a proton target at very low momentum transfer. In the Standard Model, this asymmetry reveals the proton’s coupling to the neutral vector current, the weak charge. This value, measured directly for the first time, provides a precision test of the Standard Model and constrains t ... More
Presented by Jean-Francois RAJOTTE on 12 Aug 2011 at 11:30
Type: Parallel contribution Session: Electroweak Physics
Track: Electroweak Physics
I present a measurement of the Z/gamma* transverse momentum (pTZ) distribution in proton-proton collisions at √s=7TeV using Z/gamma*->e+e− and Z/gamma*->μ+μ− decays in data samples corresponding to integrated luminosities of 35 pb^−1 and 40 pb^−1 respectively, taken in 2010 with the ATLAS detector. The normalized pTZ distributions are measured separately for electron and muon decay cha ... More
Presented by Dr. Jianbei LIU on 10 Aug 2011 at 14:30
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
We present a measurement of the helicity of the W boson produced in top quark decays using $t\bar{t}$ ~decays in the $\ell+$jets and dilepton final states selected from a sample of 5.4 fb$^{-1}$ of collisions recorded using the D0 detector at the Fermilab Tevatron $p\bar{p}$ collider. We measure the fractions of longitudinal and right-handed $W$ bosons to be $f_0 = 0.669 \pm 0.102 \mbox{ } [ \pm ... More Presented by Amitabha DAS on 12 Aug 2011 at 09:20 Type: Parallel contribution Session: Electroweak Physics Track: Electroweak Physics A measurement of the ZZ production cross section in proton-proton collisions at sqrts=7TeV using data collected by the ATLAS experiment at the LHC is presented. In a data sample corresponding to an integrated luminosity of 1.02 ifb, 12 candidate events of purely leptonically decaying Z bosons with electrons and/or muons in the final state were observed. The expected background contribution is 0.3 ... More Presented by Shih-Chieh HSU on 12 Aug 2011 at 12:10 Type: Parallel contribution Session: Top Quark Physics Track: Top Quark Physics We present a measurement of the charge asymmetry in top-pair production in proton-proton collisions at the LHC at a centre-of-mass energy of 7 TeV. We use data collected by the CMS experiment during the year 2011. The analysis uses events with one charged lepton and at least four jets. In order to measure the charge asymmetry in charge-symmetric initial state processes, the difference of absolute ... More Presented by Michael Andrew SEGALA on 12 Aug 2011 at 09:40 Type: Parallel contribution Session: Electroweak Physics Track: Electroweak Physics In 2010 the CMS experiment collected about 35 pb-1 of data during the first physics run of the LHC accelerator. We present the first measurements of the differential cross section as a function of boson rapidity and transverse momentum for Z bosons produced at 7 TeV and decaying to pairs of electrons and muons. The data are unfolded and corrected for efficiencies, allowing a direct comparison to r ... More Presented by Joseph Anthony GARTNER on 9 Aug 2011 at 14:40 Type: Parallel contribution Session: Perturbative and non-Perturbative QCD Track: Perturbative and non-Perturbative QCD The elastic proton-antiproton scattering process is studied as a function of the four-momentum transfer squared$|t|$at a center-of-mass energy of 1.96 TeV. Scattered protons and antiprotons are selected by using forward roman pot detectors that were installed around the D0 interaction point of the Tevatron. The data presented correspond to a dedicated period of low luminosity running of the ... More Presented by Andrew Gerhart BRANDT on 12 Aug 2011 at 09:40 Type: Parallel contribution Session: Top Quark Physics Track: Top Quark Physics We present measurements of the integrated forward-backward charge asymmetry in$t\bar{t}$production in$p\bar{p}$collisions using data collected with the D0 detector at the Fermilab Tevatron collider, using both the lepton+jets and dilepton final states. We present the raw measurement as well as results obtained after correcting for acceptance and detector effects and present also measurements a ... More Presented by Douglas ORBAKER on 11 Aug 2011 at 10:30 Type: Parallel contribution Session: Heavy Flavor Physics Track: Heavy Flavor Physics (bottom, charm, tau) The$\Lambda_{b}(udb)$baryon is observed in the decay$\Lambda_{b}\to J/\psi \Lambda$using 6.1 fb$^{-1}$of$p\bar{p}$collisions collected with the D0 detector at$\sqrt{s}=1.96$TeV. The production fraction multiplied by the branching fraction for this decay relative to that for the decay$B^{0}\to J/\psi K^{0}_{s}$is measured to be$0.345 \pm 0.034 \mbox{ (stat.)} \pm 0.033\mbox{ (syst.)} ... More
Presented by Ivan HEREDIA DE LA CRUZ on 12 Aug 2011 at 16:00
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
A measurement of the relative branching fraction of $B^0_s\to J/\psi f_0(980)$, $f_0(980)\to\pi^+\pi^-$ to $B^0_s\to J/\psi \phi$, $\phi\to K^+K^-$ is presented. The decay mode $B^0_s\to J/\psi f_0(980)$ is an interesting mode since it is a CP eigenstate and allows the measurement of the CP-violating phase $\phi_s$. Using approximately 8 fb$^{-1}$ of data recorded with the D0 detector at the Fermi ... More
Presented by Braden Keim ABBOTT on 11 Aug 2011 at 11:37
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
We present a measurement of the top-pair mass in tt events by using proton-proton collisions at the LHC at a centre-of-mass energy of 7 TeV. We use data collected with the CMS experiment during the year 2011. The analysis is performed in all possible final states originating from top-pair production, and the full event reconstruction is performed by using different reconstruction methods according ... More
Presented by Salvatore RAPPOCCIO on 10 Aug 2011 at 17:30
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
We present measurements of the top-quark pair-production cross section in proton-proton collisions at sqrt(s) = 7 TeV with the ATLAS detector at the Large Hadron Collider. The cross sections are measured in the lepton+jets channels.
Presented by Dr. M SALEEM on 9 Aug 2011 at 15:10
Type: Parallel contribution Session: Perturbative and non-Perturbative QCD
Track: Perturbative and non-Perturbative QCD
We present the first measurement of the inclusive three-jet differential cross section as a function of the invariant mass of the three jets with the largest transverse momenta in an event in $p\bar{p}$ collisions at $\sqrt{s}=1.96\, \mathrm{TeV}$. The measurement is made in different rapidity regions and for different jet transverse momentum requirements and is based on a data set correspon ... More
Presented by Lee SAWYER on 10 Aug 2011 at 14:00
Type: Parallel contribution Session: CP-Violation
Track: CP-Violation
We present the final measurement of time-dependent CP violation in the neutral B decays into charmonium and a K^0 meson with a large data sample containing 772 million B \bar{B} pairs collected at the Upsilon(4S) resonance with with the Belle detector at the KEKB asymmetric-energy e+e- collider. We also reports the first results on CP violation in the radiative penguin decay B^0->K_S phi gam ... More
Presented by Himansu SAHOO on 11 Aug 2011 at 11:18
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
We report an improved measurement of D^0-D^0bar mixing using the time dependence of the Dalitz plot of the decay mode D^0->K_S^0 pi^+ pi^-. In addition, we report results of searches for CP violation in the decays D^0->K_S^0 P^0 where P0 denotes a neutral pseudo-scalar meson which is either a pi^0, eta or eta^'. The result for D^0->K_S pi^0 is the most sensitive search for CP violation ... More
Presented by Debabrata MOHAPATRA on 10 Aug 2011 at 17:50
Type: Parallel contribution Session: Perturbative and non-Perturbative QCD
Track: Perturbative and non-Perturbative QCD
We present measurements of total and differential cross sections for the production of W or Z bosons in association with jets, including detailed study of the production of heavy flavor jets, using up to 6 fb-1 of ppbar collisions collected with the D0 detector at the Fermilab Tevatron collider. We present measurements of the inclusive W+n jets total cross sections (with n=1-4) and also differenti ... More
Presented by Ashish KUMAR on 10 Aug 2011 at 15:00
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
Measurements performed by the CMS experiment of the cross section for inclusive b-quark production in proton-proton collisions at sqrt(s) = 7 TeV are presented. The measurements are based on different methods, such as inclusive jet measurements with secondary vertex tagging or selecting a sample of events containing jets and at least one muon, where the transverse momentum of the muon with respect ... More
Presented by gemma TINTI on 12 Aug 2011 at 16:22
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
We measure the correlation between the spin of the top quark and the spin of the anti-top quark in $t\bar{t} \rightarrow W^{+}bW^{-}\bar{b}$ final states produced in $p\bar{p}$ collisions at a center of mass energy $\sqrt{s}=1.96$~TeV, using data collected with the D0 detector at the Fermilab Tevatron collider. The correlation is extracted using a double differential angular distribution and ... More
Presented by Kenneth BLOOM on 10 Aug 2011 at 17:50
Type: Parallel contribution Session: Perturbative and non-Perturbative QCD
Track: Perturbative and non-Perturbative QCD
We present measurements of the forward (3 < |eta| < 5) energy flow in minimum bias events and in events with either hard jets or W and Z bosons produced at central rapidities. Results are compared to MC models with different parameter tunes for the description of the underlying event.
Presented by Hans Jozef H VAN HAEVERMAET on 12 Aug 2011 at 16:20
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
We present measurements of the inclusive top quark pair production cross section in ppbar collisions at sqrt(s)=1.96 TeV utilizing data corresponding to an integrated luminosity of 5.3 fb-1 collected with the D0 detector at the Fermilab Tevatron collider. We both final states with one charged lepton, at least two jets and missing transverse energy, or final states with two charged leptons, at leas ... More
Presented by Liang LI on 9 Aug 2011 at 14:30
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
The mass of the top quark is a fundamental parameter of the Standard Model. We present a measurements of the top quark mass in proton-proton collisions at the LHC at a centre-of-mass energy of 7 TeV using data collected by the CMS experiment during the year 2011. Measurements are presented in all possible final states originating from top-pair production, and the different reconstruction methods t ... More
Presented by Aram AVETISYAN on 12 Aug 2011 at 08:40
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
We present measurments of the top quark mass and width obtained using a data sample corresponding to 5.4 fb-1 of integrated luminosity collected with the D0 detector at the Fermilab Tevatron collider. The top quark mass is obtained via the direct reconstruction of the two t-->Wb decays in ttbar events selected in the dilepton+jets+missing transverse energy and lepton+jets+missing transverse energy ... More
Presented by Yuriy ILCHENKO on 12 Aug 2011 at 09:00
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
We present several measurements of the top-pair production cross section in proton-proton collisions at the LHC at a centre-of-mass energy of 7 TeV. We use data collected with the CMS experiment during the year 2011. Measurements are presented in the lepton+jets final state, where events are selected by requiring exactly one isolated and highly energetic muon or electron, and at least four jets. I ... More
Presented by Sadia KHALIL on 9 Aug 2011 at 17:00
Type: Parallel contribution Session: Perturbative and non-Perturbative QCD
Track: Perturbative and non-Perturbative QCD
Jets play an important role in a broad range of collider studies and there have been many recent developments in understanding them. Unravelling their structure enhances our ability to interpret data, search for new physics and develop our understanding of Monte Carlos. This talk reviews some theoretical developments in jet physics and their connection to recent experimental results.
Presented by Dr. Saba ZUBERI on 9 Aug 2011 at 14:00
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
I will present a theoretical overview of the top quark physics. I will discuss the status of theoretical description of various processes at hadron colliders that are used to extract the information about dynamics of top quarks, and their quantum numbers such mass, spin and charge.
Presented by Kirill MELNIKOV on 9 Aug 2011 at 14:00
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
Over the last 30 to 40 years the Standard Model has had remarkable agreement with a large variety of experimental tests. With the large accumulated datasets at the Tevatron and the LHC the TeV scale is now being probed in detail. In this talk we will review the state of searches for physics beyond the Standard Model. In particular, we will focus on the recent results from the LHC which significant ... More
Presented by Kevin BLACK on 9 Aug 2011 at 14:00
Type: Parallel contribution Session: Field and String Theory
Track: Field and String Theory
It was recently conjectured that higher spin gravity in three dimensions is holographically dual to a simple, exactly solveable conformal field theory called the W_N minimal model. This raises the possibility of tackling some difficult questions in holography or quantum gravity by performing exact computations at all values of the coupling. I will describe the motivation for studying simplified ... More
Presented by Dr. Thomas HARTMAN on 10 Aug 2011 at 14:50
Type: Poster Session: Poster Session
Track: Poster Session
The missing transverse energy (MET) plays a fundamental role in the search for physics beyond the Standard Model at the LHC. We present an event-by-event assessment, the MET significance, of whether the observed MET is consistent with arising solely from detector-related limitations, such as measurement resolution and detection or reconstruction efficiency. We will introduce the formal definition ... More
Presented by Dr. Dayong WANG on 9 Aug 2011 at 12:40
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
Anticipating a data sample of the order of hundreds $pb^{-1}$ at a collision energy of 7 TeV by the CMS experiment at LHC in 2011, we probe new physics such as matter symmetry violation in the leptonic sector in theories with partner articles with a signature of three or more leptons in the final state. The search is organized to minimize reliance on specific kinematic variables to reduce SM backg ... More
Presented by Sanjay Ravi Ratan ARORA on 10 Aug 2011 at 18:30
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
We present a model independent search for physics beyond the standard model in lepton final states. We examine data in 120 unique final states from 1.07 fb-1 of at ppbar collisions at sqrt(s) = 1.96 TeV collected with the D0 detector. We conclude that all discrepancies seen can be attributed to modeling issues and do not claim evidence of new physics.
Presented by Dr. Peter RENKEL on 9 Aug 2011 at 15:10
Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD
Track: Heavy Ion Physics/Hot and Dense QCD
I present recent developments in simulating heavy-ion collisions using a Monte-Carlo event-generator to study high momentum probes. The simulation contains medium effects on the hard probes via the elastic and radiative energy loss and momentum broadening. The lower momentum bulk medium is simulated using relativistic hydrodynamics. Apart from inclusive observables such as the nuclear modificati ... More
Presented by Dr. Bjoern SCHENKE on 11 Aug 2011 at 11:00
Type: Parallel contribution Session: Particle Astrophysics and Cosmology
Track: Particle Astrophysics and Cosmology
We revisit multidimensional quantum tunneling, as a model for studying the state of the inflaton after a tunneling transition from a false vacuum. Previous approaches to the subject make some technically incorrect assumptions about the validity of the WKB approximation. I will present a new method that avoids these mistakes, in more carefully treating the separation between the tunneling and tran ... More
Presented by Nathaniel REDEN on 12 Aug 2011 at 09:20
Type: Plenary contribution Session: Forum on Lepton Collider Physics in the LHC Era
Track: Plenary
Presented by Dr. Ronald LIPTON on 11 Aug 2011 at 15:37
Type: Plenary contribution Session: Forum on Lepton Collider Physics in the LHC Era
Track: Plenary
Presented by Prof. Tao HAN on 11 Aug 2011 at 15:14
Type: Parallel contribution Session: Accelerator Physics
Track: Accelerator Physics
A muon collider would be a powerful tool for exploring the energy-frontier with leptons, and would complement the studies now under way at the LHC. Such a device would offer several important benefits. Muons, like electrons, are point particles so the full center-of-mass energy is available for particle production. Moreover, on account of their higher mass, muons give rise to very little synchrotr ... More
Presented by Dr. Michael ZISMAN on 10 Aug 2011 at 15:00
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
NOvA is a next generation neutrino oscillation experiment designed to search for muon neutrino to electron neutrino oscillations by comparing electron neutrino event rates in a Near Detector at Fermilab with the rates observed in a large Far Detector at Ash River, Minnesota, 810 km from Fermilab. The detectors are totally active, segmented, liquid scintillator and the Near Detector is located 14 m ... More
Presented by Dr. Gavin DAVIES on 9 Aug 2011 at 16:40
Presented by Peter FISHER on 11 Aug 2011 at 12:30
Type: Poster Session: Poster Session
Track: Field and String Theory
The AdS/CFT correspondence provides a powerful tool to attack very important questions of strong coupling dynamics using gravitational duals. The Klebanov-Stassler prototype has a large family of duals that contain ${\cal N}=1$ SYM. A new and distinct family of supergravity solutions containing a sector dual to ${\cal N}=1$ SYM might be related to the resolved cone over Einstein-Sasaki spaces. In ... More
Presented by Catherine WHITING on 9 Aug 2011 at 12:33
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
The T2K experiment is a long baseline neutrino oscillation experiment designed to directly measure $\nu_{e}$ appearance, thereby providing a measurement of $\theta_{13}$, the last unknown neutrino mixing angle. In addition, T2K will make precision measurements of $\Delta m_{23}^2$ and $\sin ^2\left( {2\theta _{23} } \right)$ via measurement of $\nu_{\mu}$ disappearance. To achieve these goals, a ... More
Presented by Glenn LOPEZ on 9 Aug 2011 at 16:20
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
SciBooNE (FNAL E954) is designed to measure precise neutrino cross sections on carbon in the one GeV region. Moreover, SciBooNE can serve as a near detector for MiniBooNE neutrino and antineutrino oscillation searches. I will present SciBooNE's most recent results on neutrino cross section measurements and the search for neutrino disappearance with MiniBooNE.
Presented by Dr. Morgan WASCKO on 11 Aug 2011 at 10:30
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by Jennifer RAAF on 9 Aug 2011 at 11:15
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by Prof. Lisa Everett EVERETT on 9 Aug 2011 at 10:45
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
The T2K experiment is an off-axis long baseline neutrino oscillation experiment. It utilizes the intense nu_mu beam generated at the J-PARC accelerator complex in Tokai, Japan. It has a near detector, ND280, at 280m from the proton target, and Super-Kamiokande as far detector at 295 km. The measurements of the neutral current pi0 and single charged current pi+ (as part of CC inclusive) cross-secti ... More
Presented by Dmitriy BEZNOSKO on 10 Aug 2011 at 15:40
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
The NuMI Off-Axis electron neutrino Appearance (NOvA) experiment has started taking data with the 209 ton liquid scintillator-filled prototype of the near detector in the end of November 2010. This detector collects data from two sources, the Main Injector complex and from the Booster Neutrino Beam. At the location of the prototype detector due to the off-axis effect the NuMI beam is narrow with ... More
Presented by Dr. Jaroslaw NOWAK on 11 Aug 2011 at 10:50
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
A thorough understanding of the physics of neutrino nucleus scattering continues to evade us even after 50 years of experimental work. This is mainly caused by the challenges of these experiments that include beams with large energy uncertainty, low event rates, and large backgrounds. Progress has been made in recent years with new results from improved experiments. It is important to continue ... More
Presented by Dr. Rex TAYLOE on 10 Aug 2011 at 14:00
Type: Parallel contribution Session: Field and String Theory
Track: Field and String Theory
Scattering amplitudes have played a central role in quantum field theory since its inception. Recent years have seen remarkable progress in our understanding of their previously hidden mathematical simplicity, and in our ability to compute previously intractable scattering amplitudes, both for theoretical and phenomenological purposes. In this talk I will review several of the latest advances on s ... More
Presented by Marcus SPRADLIN on 10 Aug 2011 at 14:00
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
We present a new measurement of the Upsilon(1S), (2S), and (3S) polarization in dimuon events from p-pbar collisions at 1.96 TeV, using the CDF detector at the Tevatron. The measurement is conducted exploiting the full 3-dimensional angular distributions over a pT range of 2-40 GeV/c, based on data comprising an integrated luminosity of 6.0 fb-1. We also report the first measurement of product ... More
Presented by Niharika RANJAN on 9 Aug 2011 at 14:44
Type: Parallel contribution Session: Accelerator Physics
Track: Accelerator Physics
The hollow electron beam collimator is a novel concept of controlled halo removal for intense high-energy beams in storage rings and colliders. It is based on the interaction of the circulating beam with a 5-keV, magnetically confined, pulsed hollow electron beam in a 2-m-long section of the ring. The electrons enclose the circulating beam, kicking halo particles transversely and leaving the beam ... More
Presented by Giulio STANCARI on 9 Aug 2011 at 17:00
Type: Parallel contribution Session: Detector Technology and R&D
Track: Detector Technology and R&D
New Optical Link Technologies for HEP Experiments B. Fernando, D. Underwood, R. Stanek, P.M. DeLurgio, High Energy Physics, Argonne National Laboratory D. Lopez, Center for Nanoscale Materials, Argonne National Laboratory As a concern with the reliability and mass of current optical links in LHC experiments, we are investigating CW lasers and light modulators as an alternative ... More
Presented by Waruna FERNANDO on 12 Aug 2011 at 16:00
Type: Parallel contribution Session: Particle Astrophysics and Cosmology
Track: Particle Astrophysics and Cosmology
Any program to identify dark matter relies on direct detection of dark matter scattering in low-background experiments, collider signatures, and indirect astrophysical signatures of dark matter. I will review contemporary constraints from indirect searches for dark matter. I will then present several new perspectives on the indirect detection of dark matter. First I will focus on the Sun and sh ... More
Presented by Prof. Andrew ZENTNER on 12 Aug 2011 at 09:00
Type: Parallel contribution Session: Detector Technology and R&D
Track: Detector Technology and R&D
Broad overview of applications outside accelerators
Presented by Carter HALL on 12 Aug 2011 at 10:50
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
We study the decays of the lightest Higgs boson within the exceptional supersymmetric (SUSY) standard model (E6SSM). The E6SSM is based on the SM gauge group together with an extra U(1)_{N} gauge symmetry under which right-handed neutrinos have zero charge. The low energy matter content of the E6SSM involves three 27 representations of E_6 and a pair of SU(2) doublets from additional 27 and \bar{ ... More
Presented by Roman NEVZOROV on 12 Aug 2011 at 08:00
Type: Parallel contribution Session: Accelerator Physics
Track: Accelerator Physics
The KEKB B factory is being upgraded to search for physics beyond the Standard Model, with a target luminosity of 8x10^35 cm^-2 s^-1, a factor of 40 times greater than the world record luminosity achieved at KEKB. To achieve this target luminosity the upgraded machine, SuperKEKB, will require the use of new advances in accelerator technology, among them the development of a low-emittance, high-bu ... More
Presented by Dr. John FLANAGAN on 11 Aug 2011 at 11:30
Type: Parallel contribution Session: Accelerator Physics
Track: Accelerator Physics
To meet the energy and luminosity requirements of future HEP machines, advances are required in accelerator instrumentation and technology in many diverse areas, such as: acceleration, component alignment and stability, fast timing instrumentation and optics, photocathodes, pulsed power components, photon detectors, halo monitors, collimators, lasers, insertion devices, noninvasive profile monitor ... More
Presented by Dr. John BYRD on 9 Aug 2011 at 17:30
Type: Poster Session: Poster Session
Track: Higgs Physics
In preceding paper 1) the mass and the basic structure of SM Higgs boson (H0) were discussed by obtaining asymptotic solution for the Euler-Lagrange equation of nonlinear Klein-Gordon type, in Higgs field with newly developed mass triangle method. In this paper we at first see that the ground state mass of glueball (GB) is calculated at 502.55 MeV/c2 which is expected as f0(600) meson’s mass. T ... More
Presented by Kazuyoshi KITAZAWA on 9 Aug 2011 at 12:41
Type: Poster Session: Poster Session
Track: Beyond the Standard Model
It is well known that in no--scale supergravity global symmetries protect local supersymmetry (SUSY) and a zero value for the cosmological constant. The breakdown of these symmetries that ensures the vanishing of the vacuum energy density near the physical vacuum leads to the natural realization of the multiple point principle (MPP) assumption, i.e. results in the set of degenerate vacua with bro ... More
Presented by Dr. Roman NEVZOROV on 9 Aug 2011 at 12:36
Chair - Ken Bloom (Nebraska), Gordon Watts (UW Seattle)
Presented by Adrian CHO, Michael Henry SCHMITT, Lisa VAN PAY on 9 Aug 2011 at 12:35
Type: Parallel contribution Session: Perturbative and non-Perturbative QCD
Track: Perturbative and non-Perturbative QCD
We calculate the electric-dipole and magnetic-quadrupole form factors of the deuteron that arise as a low-energy manifestation of parity and time-reversal violation in quark-gluon interactions of effective dimension four and six: the QCD vacuum angle, the quark electric and chromo-electric dipole moments, and the gluon chromo-electric dipole moment. Within the framework of two-flavor chiral pertur ... More
Presented by Emanuele MEREGHETTI on 11 Aug 2011 at 12:10
Type: Parallel contribution Session: Education and Outreach
Track: Education and Outreach
The IPPOG and U.S. particle physics masterclasses took place worldwide in March, 2011. For the first time, all masterclasses used real LHC data. Students in the U.S. masterclasses (that included participants in several countries outside the U.S.) analyzed both ATLAS and CMS data. QuarkNet has been evaluating the U.S. effort since 2008. The design of the LHC masterclasses and the results of this s ... More
Presented by Kenneth William CECIRE on 10 Aug 2011 at 16:30
Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD
Track: Heavy Ion Physics/Hot and Dense QCD
I present results on the derivation of the distribution of energy and momentum transmitted from a primary fast parton and its medium-induced bremsstrahlung gluons to a thermalized quark-gluon plasma. The calculation takes into account the important and thus far neglected effects of quantum interference between the resulting color currents. From the result I obtain the rate at which energy is absor ... More
Presented by Dr. Richard NEUFELD on 10 Aug 2011 at 18:00
Type: Parallel contribution Session: Detector Technology and R&D
Track: Detector Technology and R&D
The ATLAS Transition Radiation Tracker (TRT) is the outermost of the three sub-systems of the ATLAS Inner Detector at the Large Hadron Collider at CERN. In addition to its tracking capabilities, the TRT provides particle identification (PID) ability through the detection of transition radiation X-ray photons. The latter functionality provides substantial discriminating power between electrons and ... More
Presented by Elizabeth HINES on 10 Aug 2011 at 17:25
Type: Parallel contribution Session: Detector Technology and R&D
Track: Detector Technology and R&D
The CMS Electromagnetic Calorimeter (ECAL) is a high resolution, fine grained calorimeter devised to measure photons and electrons at the LHC. Built of lead tungstate crystals, it plays a crucial role in the search for new physics as well as in precision measurements of the Standard Model. A pre-shower detector composed of sandwiches of lead and silicon strips improves pi-0/gamma separation in the ... More
Presented by Marco GRASSI on 10 Aug 2011 at 17:05
Type: Parallel contribution Session: Detector Technology and R&D
Track: Detector Technology and R&D
Identification of jets originating from b quarks (b-tagging) will likely continue to be a key element of many physics analyses at the upgraded HL-LHC where much higher pileup can significantly reduce the performance. An upgrade of the CMS pixel detector proposed for the Phase 1 HL-LHC should enable CMS to maintain the current level of b-tagging performance even in the presence of very high pileup. ... More
Presented by Eric Charles BROWNSON on 9 Aug 2011 at 16:00
Type: Parallel contribution Session: Computing in HEP
Track: Computing in HEP
The ATLAS detector [1] at CERN has completed its first full year of recording collisions at 7 TeV, resulting in billions of events and petabytes of data. At these scales, physicists must have the capability to read only the data of interest to their analyses, with the importance of efficient selective access increasing as data taking continues. ATLAS has developed a sophisticated event-level me ... More
Presented by Peter VAN GEMMEREN on 11 Aug 2011 at 12:00
Type: Parallel contribution Session: Education and Outreach
Track: Education and Outreach
Press releases are issued by labs when a major result such as a discovery is announced. More commonly, we write papers that are not worthy of a press release. Nonetheless, many in the public are quite interested to see progress in our experiments. Tevatron experiments have pioneered plain English summaries of experimental papers, and the concept is spreading to the LHC experiments. It i ... More
Presented by Michael BARNETT on 9 Aug 2011 at 17:45
Type: Poster Session: Poster Session
Track: Particle Astrophysics and Cosmology
The creation of antihydrogens at CERN (1995) and Fermilab (1997) and the very recent synthesizing of antiheliums at CERN (2011) have invigorated the fascinating idea about the existence of separate universe and antiuniverse as a resultant of the big bang. Particularly, the production of exotic atoms composed of particles and antiparticles (e.g. positroniums, Ps, protoniums, Pn, true muoniums, Mu, ... More
Presented by Prof. Mohamed Assad ABDEL-RAOUF on 9 Aug 2011 at 12:38
Type: Parallel contribution Session: Accelerator Physics
Track: Accelerator Physics
A precision luminosity measurement is of critical importance for the ATLAS physics program, both for searches for new physics as well as for precision measurements of Standard Model cross-sections. The calibration of the luminosity is based on three so-called van der Meer scans that were performed in 2010. These scans determine the convolved beam sizes in the vertical and horizontal directions, ... More
Presented by Eric TORRENCE on 11 Aug 2011 at 11:00
Type: Parallel contribution Session: CP-Violation
Track: CP-Violation
In this talk, I will discuss T-odd correlations induced by CP violating anomalous top-quark couplings at both production and decay level in the context of the Tevatron and the Large hadron collider. We will also show that by simply making use of four momenta of the top decay products it is possible to isolate such effects. With specific examples of top decay modes the experimental sensitivities fo ... More
Presented by Dr. Sudhir GUPTA on 9 Aug 2011 at 17:08
Type: Parallel contribution Session: Particle Astrophysics and Cosmology
Track: Particle Astrophysics and Cosmology
Over the coming decade, tiny fluctuations in temperature and polarization of the Cosmic Microwave Background (CMB) will be mapped with unprecedented resolution. The Planck Surveyor, the Atacama Cosmology Telescope (ACT), and the South Pole Telescope (SPT) are already making great advances. In a few years, high resolution polarization experiments, such as PolarBear, ACTPol, and SPTPol will be in f ... More
Presented by Sudeep DAS on 11 Aug 2011 at 11:50
Type: Parallel contribution Session: Hadron Spectroscopy
Scalar mesons play important roles in low-energy QCD and are known to be nontrivial states in hadron spectroscopy. Within the context of a generalized linear sigma model that includes two nonets of scalar mesons (a two-quark nonet and a four-quark nonet) and two nonets of pseudoscalar mesons (a two-quark nonet and a four-quark nonet) a collective description of scalar and pseudoscalar mesons belo ... More
Presented by Prof. Amir FARIBORZ on 12 Aug 2011 at 09:30
Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD
Track: Heavy Ion Physics/Hot and Dense QCD
The high energy nucleus-nucleus collision at RHIC has produced the quark matter where quarks and gluons are believed to be deconfined. Single particle spectra has shown that parton lose significant amount of energy in such medium. It’s therefore important to further explore the medium properties using multi-particle correlations and jets. In this contribution, we present recent resul ... More
Presented by Dr. Hua PEI on 10 Aug 2011 at 14:00
Type: Parallel contribution Session: Accelerator Physics
Track: Accelerator Physics
Accelerators are essential tools of discovery and have many practical uses. More than three decades ago, lasers were proposed as power sources for driving novel accelerators based on plasmas as the accelerating medium. An overview will be presented of the basic principles of laser plasma accelerators (LPA) and of the research at LBNL. This includes the 2004 demonstration of high quality electron b ... More
Presented by Dr. Wim LEEMANS on 12 Aug 2011 at 08:00
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
It is well known that the neutrino masses affect the shape of the energy spectrum of tritium beta-decay electrons. However, experiments have yet to measure that distortion. The Project 8 experiment proposes to measure the spectral distortion in a novel way: using radio-frequency techniques to detect and measure the energies of the beta-decay electrons. We plan on measuring the radiation created ... More
Presented by Dr. Noah OBLATH on 12 Aug 2011 at 09:20
Presented by Brendan CASEY, Stephen HOLMES on 10 Aug 2011 at 12:45
Type: Parallel contribution Session: Accelerator Physics
Track: Accelerator Physics
Fermilab is leading an international consortium to develop the design of “Project-X” which is an accelerator complex based on a new H- linac that will drive a broad range of experiments at the Intensity Frontier. Project X will provide multi-MW beams from the Main Injector over the energy range 60-120 GeV, simultaneous with mult-MW beams at 3 GeV. The Project-X research program includes world ... More
Presented by Bob TSCHIRHART on 10 Aug 2011 at 14:00
Presented by Dr. William BRINKMAN on 11 Aug 2011 at 13:30
on 10 Aug 2011 at 13:25
Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD
Track: Heavy Ion Physics/Hot and Dense QCD
QCD critical point is a singularity on the QCD phase diagram with distinct signatures which make possible its discovery in heavy-ion collisions. I shall describe the characteristics of the non-monotonous behavior of observables measuring the magnitude and non-Gaussianity of event-by-event fluctuations as a function of the beam energy in the presence of the QCD critical point. I shall discuss impl ... More
Presented by Prof. Misha STEPHANOV on 9 Aug 2011 at 14:30
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by Prof. Joey HUSTON on 10 Aug 2011 at 09:00
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by Prof. Christian BAUER on 10 Aug 2011 at 09:30
Type: Parallel contribution Session: Detector Technology and R&D
Track: Detector Technology and R&D
RADIATION-HARD ASICS FOR OPTICAL DATA TRANSMISSION K.K. GAN*, P. BUCHHOLZ**, H.P. KAGAN*, R.D. KASS*, J.R. MOORE*, D.S. SMITH*, A. WIESE**, M. ZIOLKOWSKI** * Department of Physics, The Ohio State University, Columbus, OH 43210, USA ** Fachbereich Physik, Universität Siegen, Siegen, Germany The LHC at CERN has successfully reached energies and luminosities beyond previous hadron ... More
Presented by Prof. Richard KASS on 12 Aug 2011 at 16:20
Type: Parallel contribution Session: Electroweak Physics
Track: Electroweak Physics
We present a study of jets produced in association with vector bosons production in pp collisions at center-of-mass energy of 7 TeV using the full CMS 2010 data set, corresponding to 36 pb−1. The transverse energy distribution of the reconstructed leading jets is measured and compared to theoretical expectations. The jet multiplicity distributions are efficiency corrected and unfolded . The rati ... More
Presented by Kira Suzanne GROGG on 9 Aug 2011 at 17:20
Type: Parallel contribution Session: Hadron Spectroscopy
We present a study of the radiative transitions from decays of the Y(2S) and Y(3S) resonances using photons that have converted into an e+e- pair, obtaining precise measurements of the branching fractions for chi_b1,2(1, 2P) --> gamma Y(1S) and chi_b1,2(2P) -->gamma Y(2S) transitions and search for radiative decay to the eta_b(1S) and eta_b(2S) states. We present a search for the spin-singlet ... More
Presented by Veronique ZIEGLER on 12 Aug 2011 at 09:50
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
We report on recent results of measurements of hadronic B decay branching fractions from BABAR. These results include B0->D(*)0h0 (where h0 is a neutral hadron), B->D(*)D(*)K, B->D(*)ppbar and B->D(*)0Ks0.
Presented by Prof. David Norvil BROWN on 12 Aug 2011 at 11:14
Type: Parallel contribution Session: CP-Violation
Track: CP-Violation
We report on the study of the decay B+ ->D0(D0bar) K+ where the D0 or D0bar decaying to Kpipi0, with the Atwood Dunietz and Soni (ADS) method. We measure the ratios Rads, R+, and R- that, since the processes B+ -> D0barK+ and B+ -> D0K+ are proportional to Vcb and Vub, respectively, are sensitive to rB and to the weak phase gamma. We also report the results of CP violation studies of B->Dcp pi+p ... More
Presented by Dr. Romulus GODANG on 11 Aug 2011 at 10:54
Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD
Track: Heavy Ion Physics/Hot and Dense QCD
Enhanced fluctuations and correlations have been observed in the phase transitions of many systems. Their appearance at the predicted QCD phase transition (especially near the expected critical point) may provide insight into the nature of the phase transition. Recent results from the QCD Critical Point Search at RHIC will be presented, with a focus on particle ratio (K/$\pi$, p/$\pi$, and $K/p$) ... More
Presented by Dr. Terence John TARNOWSKY on 9 Aug 2011 at 15:15
Type: Parallel contribution Session: Particle Astrophysics and Cosmology
Track: Particle Astrophysics and Cosmology
The Dark Matter Time Projection Chamber (DMTPC) experiment uses a time projection chamber filled with low pressure CF4 gas to detect the direction of WIMP-induced nuclear recoils. Recoils from WIMPs in the galactic dark matter halo are expected to have a directional signal distinct from all known backgrounds. Recent work has been done to develop instrumentation to read out both the scintillat ... More
Presented by Mr. Jeremy LOPEZ on 12 Aug 2011 at 08:20
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
We perform a study of the Standard Model (SM) fit to the mixing quantities Delta M_{B_s} and Delta Gamma_{B_s}/Delta M_{B_s} in order to bound contributions of New Physics (NP) to B_s mixing. We then use this to explore the branching fraction of B_s -> mu+mu- in certain models of NP. In most cases, this constrains NP amplitudes for B_s -> mu+mu- to lie below the SM component.
Presented by Prof. Gene GOLOWICH on 12 Aug 2011 at 08:00
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
Precision measurements in charm physics offer a window into a unique sector of potential New Physics interactions. LHCb is well equipped to take advantage of the enormous production cross-section of charm mesons in $pp$ collisions at $\sqrt{s}=7$~TeV. The measurement of the $D^0 -\bar{D^0}$ mixing parameters and the search for CP-violation in the charm sector are key physics goals of the LHC ... More
Presented by Silvia BORGHI on 10 Aug 2011 at 18:10
Type: Parallel contribution Session: Low Energy Searches for Physics Beyond the Standard Model
Track: Low Energy Searches for Physics Beyond the Standard Model
Presented by donato NICOLO on 10 Aug 2011 at 17:10
Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD
Track: Heavy Ion Physics/Hot and Dense QCD
A broad program of measurements using heavy ion collisions is underway in ATLAS, with the aim of studying the properties of QCD matter at high temperatures and densities. This talk describes measurements performed using up to 9 µb-1 of lead-lead collision data provided at a nucleon-nucleon center-of-mass energy of 2.76 GeV by the Large Hadron Collider and collected by the ATLAS Detector during No ... More
Presented by Dr. Peter Alan STEINBERG on 10 Aug 2011 at 17:00
Type: Parallel contribution Session: Electroweak Physics
Track: Electroweak Physics
Experiments at the Tevatron and the LHC have recently studied the electroweak gauge sector of the Standard Model with impressive breadth and precision. In this talk we discuss several new experimental results, and the theoretical progress they have spurred.
Presented by Frank PETRIELLO on 9 Aug 2011 at 14:00
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
Presented by Marina ARTUSO on 12 Aug 2011 at 11:58
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
Presented by Gavril GIURGIU on 12 Aug 2011 at 09:30
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
The search for the SM Higgs boson is reaching a critical juncture. Either evidence will be found or an exclusion will be set during the upcoming LHC year of running. We review the recent experimental results and the theoretical progress that has enabled the search for the Higgs.
Presented by Radja BOUGHEZAL on 11 Aug 2011 at 10:30
Presented by Presenters and participants ALL on 10 Aug 2011 at 17:50
Type: Parallel contribution Session: Accelerator Physics
Track: Accelerator Physics
The superconducting RF (SRF) technology is increasingly becoming the technology of choice for a wide range of particle accelerators. It has found applications in high energy and nuclear physics accelerators, spallation neutron sources, and light sources. The opportunities offered by the SRF technology, and its challenges, will be presented and reviewed.
Presented by Prof. Jean DELAYEN on 10 Aug 2011 at 17:30
Type: Parallel contribution Session: Detector Technology and R&D
Track: Detector Technology and R&D
STUDY OF THE RADIATION-HARDNESS OF VCSEL/PIN K.K. GAN, H.P. KAGAN, R.D. KASS, H. MERRITT, J. MOORE, A. NAGARKAR, D.S. SMITH, M. STRANG Department of Physics, The Ohio State University, Columbus, OH 43210, USA Optical links are now widely used in high energy physics experiments for data transmission. The links substantially reduce the volume of metallic signal cables freeing up valuable det ... More
Presented by Prof. K. K.Gan GAN on 12 Aug 2011 at 16:40
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
The dominant production mechanism for Standard Model (SM) Higgs boson is gg->h. However, in certain beyond the SM scenarios, Higgs production with bottom quarks can become dominant due to enhanced bottom quark Yukawa coupling. One such model is the Minimal Supersymmetric Standard Model (MSSM) where the bottom Yukawa coupling to Higgs bosons, including the SM-like Higgs, gets significantly modified ... More
Presented by Prerit JAISWAL on 9 Aug 2011 at 17:32
Type: Poster Session: Poster Session
Track: Poster Session
The status of the Sanford Underground Laboratory at Homestake in Lead, South Dakota will be presented. Excavation of new underground facilities at 4850 feet (about 1480 m) has been completed. Outfitting of the excavated space to house and support the Large Underground Xenon (LUX) detector searching for dark matter and the MAJORANA DEMONSTRATOR neutrinoless double-beta decay experiment is underway ... More
Presented by Dr. Jaret HEISE on 9 Aug 2011 at 12:43
Type: Parallel contribution Session: Detector Technology and R&D
Track: Detector Technology and R&D
The SciBath prototype detector consists of 90 liters of liquid scintillator containing 768 wavelength-shifting fibers aligned in a three dimensional grid. This unique design allows reconstruction of charged particle tracks in arbitrary directions. While constructed as a prototype neutrino detector it is also able to detect neutrons in the 1-100MeV range with O(30%) efficiency and energy re ... More
Presented by Prof. Rex TAYLOE on 12 Aug 2011 at 11:55
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
SciNOvA is a proposed experiment to deploy a fine-grained scintillator detector in front of the NOvA near detector to collect neutrino-nucleus scattering events in the NUMI, off-axis, narrow-band neutrino beam at Fermilab. This detector can make unique contributions to the measurement of charged- and neutral-current quasi-elastic scattering; and neutral-current $\pi^0$ and photon productio ... More
Presented by Xinchun TIAN on 11 Aug 2011 at 11:30
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
Results for a Higgs boson search by the ATLAS experiment in the WH->lnubb and H->WW->lnulnu decay modes using a multivariate approach are presented. The results are based on data taken in 2011 at 7 TeV center-of-mass energy. No evidence is found for a Standard Model-like Higgs boson in either decay mode. Exclusion limits in terms of the ratio to expected SM rate are reported in Higgs mass ranges o ... More
Presented by G CARRILLO MONTOYA on 10 Aug 2011 at 17:12
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
The rare decays B_(s,d) ->mumu provide an excellent test of the flavor sector of the Standard Model and provide sensitivity to models of new physics with extended Higgs boson sectors. We report on a search for these decays with the CMS experiment using data taken until Summer 2011.
Presented by Mr. Jose LAZO-FLORES on 12 Aug 2011 at 08:52
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
With the $\sim 1$~fb$^{-1}$ of data expected in the 2011-12 run, LHCb will achieve the world's best sensitivity to the very rare decay $B_s to \mu^+\mu^-$, exploring a regime where many models of New Physics predict a signal, and reaching down towards the Standard Model value for the branching ratio. Results will be presented from data collected in 2010, and from the early months of the 201 ... More
Presented by Marc-Olivier BETTLER on 12 Aug 2011 at 09:12
Type: Parallel contribution Session: CP-Violation
Track: CP-Violation
The determination of the mixing induced CP-violating asymmetry in decays such as $B^0_s \to J/\psi \phi$ is one of the key goals of the LHCb experiment. Its value is predicted to be very small in the Standard Model but can be significantly enhanced in many models of New Physics. The steps towards a precise determination of this phase with a flavour-tagged, time-dependent, angular analysis o ... More
Presented by Daan VAN EIJK on 10 Aug 2011 at 17:18
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
We present a search for chargino and neutralino supersymmetric particles yielding same signed dilepton final states including one hadronically decaying tau lepton using 6.0 fb^-1 of data collected by the the CDF II detector. This signature is important in SUSY models where, at high \tan{\beta}, the branching ratio of charginos and neutralinos to tau leptons becomes dominant. We study event accept ... More
Presented by Mr. Robert FORREST on 10 Aug 2011 at 16:50
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
The MINOS Collaboration continues its search for electron neutrino appearance in the NuMI beam at Fermilab. Neutrinos in the beam interact in the Near Detector, located 1 km from the beam source, allowing us to characterize the backgrounds present in our analysis. In particular, we can estimate the number of electron neutrino candidate events we expect to see in the Far Detector (735 km away, in t ... More
Presented by Mr. Mhair ORCHANIAN on 9 Aug 2011 at 14:55
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
The Standard Model with three generations of quarks describes remarkably well all particle phenomena observed to date. Although adding a fourth generation of massive fermions is an obvious extension of the model, it became less popular ever since the limit on light neutrino flavors, and the precise measurements on the electroweak parameters, seem to disfavor such a possibility. However, indirect l ... More
Presented by Michael LUK on 9 Aug 2011 at 14:50
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
We report the result of two searches for final states with either two photons and large missing transverse energy or with a Z boson, a photon and large missing transverse energy, using data collected with the D0 detector at the Fermilab Tevatron collider and corresponding to integrated luminosities of up to 6.3 fb-1. The result of these searches are interpreted in the framework of gauge mediated s ... More
Presented by Yunhe XIE on 10 Aug 2011 at 15:20
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
We perform a search for vector-like quarks more massive than the top quark coupling to lighter generations using data collected with the ATLAS detector. The W and Z bosons are reconstructed in the $W\rightarrow l^{\pm}\nu$ and $Z\rightarrow l^{+}l^{-}$ where $l=e,\mu$. The vector-like quark is reconstructed from the W or Z and the highest $p_{T}$ jet.
Presented by Mr. Samuel MEEHAN on 9 Aug 2011 at 14:30
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
Diphoton final state is one of the most sensitive channels to a Higgs search in the low mass region (115GeV-140GeV). The analysis is optimized to search for a Standard Model (SM) Higgs and dominates the SM Higgs combination in the mass range lower than 120GeV. Nevertheless, an inclusive search strategy adopted is also sensitive to find a low mass diphoton resonance that could be predicted by some ... More
Presented by Haichen WANG on 9 Aug 2011 at 16:46
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
The ATLAS detector has been used to search for high-mass states decaying into a single high momentum lepton and missing energy, such as new heavy charged gauge bosons. Based on proton-proton collisions at a center of mass energy of 7 TeV produced at the Large Hadron Collider, the latest search results for a W' decaying to lepton plus neutrino are presented.
Presented by James David DEGENHARDT on 12 Aug 2011 at 16:20
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
Results are presented of a search for new physics in events with large missing transverse energy and heavy flavor jet candidates in √s=7 TeV proton-proton collisions with the ATLAS detector at the Large Hadron Collider. Several signal regions corresponding to different regions of phase space are examined. The results are interpreted in the context of phenomenological simplified new phy ... More
Presented by Bart BUTLER on 9 Aug 2011 at 17:20
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
A study of events with missing transverse energy plus a single energetic jet using 35 pb$^-1$ of $pp$ collision data at 7 TeV, collected by the CMS detector at LHC is presented. This topolgy is a signature of large extra dimensions in the framework of the ADD model, and the unparticles. The number of observed events is in good agreement with the prediction of the Standard Model. The 95\% CL limits ... More
Presented by SARAH MALIK on 12 Aug 2011 at 08:20
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
The results of searches for Supersymmetry in events with two opposite-sign isolated leptons, hadronic jets, and missing transverse energy in the final state are presented. The searches use pp collisions at 7 TeV collected in 2011 by the CMS experiment.
Presented by Derek Michael BARGE on 9 Aug 2011 at 17:00
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
With a substantial increase in luminosity at the LHC, 2011 is an exciting time for searches for new physics. The Randall-Sundrum model, in which a warped extra dimension is introduced to resolve the hierarchy problem, predicts a spectrum of massive excited gravitons. There is significant potential for discovery of the lightest of these gravitons. The latest results from the ATLAS Collaboration ... More
Presented by Mr. Evan WULF on 10 Aug 2011 at 14:40
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
Searches conducted at the Fermilab Tevatron for the Higgs boson in final states containing tau leptons are reported using data collected at the CDF and D0 experiments. The branching fraction for H-tau+tau is non-negligible for a low-mass standard model Higgs boson. In addition, in channels such as WH and H-WW, a W boson may decay into a final state including a tau lepton. This talk will summarize ... More
Presented by Elisabetta PIANORI on 12 Aug 2011 at 08:39
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
Massive, long-lived particles (LLP) are predicted in several supersymmetry and beyond the Standard Model scenarios. In some cases these heavy objects, if produced in 7 TeV pp collisions at the CERN LHC, may lose all of their energy and come to rest within the detector volume. We describe the search for gluino R-hadrons which have been captured within the ATLAS detector volume, particularly the c ... More
Presented by Josh COGAN on 12 Aug 2011 at 11:30
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
A search for physics beyond the Standard Model (SM) is performed using events with at least three leptons and any number of jets. The search is performed in data collected in 2011 by the CMS experiment at the LHC in pp-collisions at a center of mass energy of 7 TeV. Numerous leptonic channels have been investigated in an exclusive manner and data-driven techniques are used to quantify the SM backg ... More
Presented by Sho MARUYAMA on 10 Aug 2011 at 17:50
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
We present the latest results of searches for W' bosons using data collected by the CMS experiment.
Presented by Tulika BOSE on 12 Aug 2011 at 08:40
Type: Parallel contribution Session: Electroweak Physics
Track: Electroweak Physics
We present a search for WW/WZ diboson production in the lepton plus neutrino plus heavy flavor dijet channel at the CDFII experiment. After successful observation of WW/WZ in the inclusive lepton plus neutrino plus dijet channel, we now focus on the identification of this process in cases where either a W or Z boson decays into one or more heavy flavor quarks. The search uses events with a single ... More
Presented by Federico SFORZA on 12 Aug 2011 at 10:50
Type: Parallel contribution Session: Low Energy Searches for Physics Beyond the Standard Model
Track: Low Energy Searches for Physics Beyond the Standard Model
At the new ultracold neutron source at the Paul Scherrer Institut(PSI) a collaboration of 15 European institutions is setting up an experiment to search for the nEDM with improved sensitivity. The same apparatus which provided the present best limit on the nEDM (d < 2.9 x 10-26 ecm 90% CL, Baker et al., Phys. Rev. Lett. 97 (2006) 131801), was moved from the Institut Laue Langevin (ILL) in spring 2 ... More
Presented by Dr. Philipp SCHMIDT-WELLENBURG on 9 Aug 2011 at 14:00
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
The left-right (LR) symmetric model explains the origin of the parity violation in weak interactions and predicts the existence of additional heavy right-handed W and Z' gauge bosons. In addition, heavy right-handed neutrino states arise naturally within the LR symmetric model. These neutrinos can be partners of light neutrino states, related to their non-zero masses through the see-saw mechanism. ... More
Presented by Nathaniel Joseph PASTIKA on 12 Aug 2011 at 16:00
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
We present a search for a low mass Standard Model Higgs boson produced in association with a W boson at a center-of-mass energy of 1.96 TeV with the CDF and D0 detectors at the Fermilab Tevatron collider. The search is performed in events containing one lepton (electron, muon or tau), an imbalance in the transverse energy, and one or two b-tagged jets with up to 8.5 fb-1 of data. This channel is ... More
Presented by Duncan BROWN on 12 Aug 2011 at 10:53
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
We present a search for a low mass Standard Model Higgs boson produced in association with a Z boson decaying invisibly into a pair of neutrinos at a center-of-mass energy of 1.96 TeV with the CDF and D0 detectors at the Fermilab Tevatron collider. The final state is characterised by the presence of two b-tagged jets from the Higgs boson decay and a large imbalance in the transverse energy of the ... More
Presented by Tim SCANLON on 12 Aug 2011 at 11:16
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
Searches for the standard model Higgs boson produced with a Z boson are presented based on data from the CDF and D0 experiments at the Fermilab Tevatron. In events consistent with the decay of the Higgs boson to a bottom-quark pair and the Z boson to electrons or muons, 95% credibility level upper limits are set on the ZH production cross section times the H -> b bbar branching ratio. Improved ana ... More
Presented by Michael KIRBY on 12 Aug 2011 at 11:39
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
We present searches for charged Higgs prodution in decays of top quarks and also pair production of doubly charged Higgs boson decaying to di-tau, di-muon, and muon+tau final states. The searches are performed in proton-antiproton collisions at a centre of mass energy of 1.96 TeV using an integrated luminosity of up to 7 fb-1 collected by the CDF and D0 experiments at the Fermilab Tevatron Collli ... More
Presented by Louise SUTER on 10 Aug 2011 at 15:10
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
We will present a search on dark matter particles of nearly GeV scale that decay into highly boosted set of electrons. \ These collimated set of leptons produced in the final state are called lepton-jets. \ The search is motivated by recent observations from astrophysical experiments on the anomalous excess of cosmic ray leptons. \ The analysis is performed using the data collected by the ATLAS de ... More
Presented by Mahsana AHSAN on 12 Aug 2011 at 08:00
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
We present a search for flavor changing neutral currents in decays of top quarks. The analysis is based on a search for $t\bar{t}\rightarrow\ell'\nu\ell\bar{\ell}$+jets ($\ell, \ell' = e,\mu$) final states using 4.1~{\rm fb}$^{-1}$ of integrated luminosity of $p\bar{p}$ collisions at $\sqrt{s} = 1.96$~{\rm TeV}. We extract limits on the branching ratio $B(t\rightarrow Zq)$ ($q = u, c$ quarks) ... More
Presented by Carrie MCGIVERN on 10 Aug 2011 at 15:20
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
The ATLAS detector has been used to search for high mass e e or mu mu resonances, such as new heavy neutral gauge bosons. This talk will present the latest search results for a high mass state decaying to dilepton pairs, in proton-proton collisions at a center of mass energy of 7 TeV at the Large Hadron Collider using data recorded by the ATLAS experiment in 2011.
Presented by Mr. Dominick OLIVITO on 10 Aug 2011 at 14:20
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
The results of a search for supersymmetry in multilepton final states using the ATLAS detector is presented. Such signals require three or more leptons, jets, and missing transverse energy. This channel provides the advantage that the contribution due to standard model backgrounds is expected to be very low. Results from the 2011 data-taking will be reported.
Presented by Jeremiah Jet GOODSON on 10 Aug 2011 at 18:10
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
Presented by Gennadiy KUKARTSEV on 12 Aug 2011 at 16:40
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
A search for neutral Higgs bosons decaying into b-bbar, produced in association with b quarks in p-pbar collisions is presented. This process could be observable in supersymmetric models with high values of tan(beta) due to an enhancement of the production cross section. The event samples correspond to 2.6/fb of integrated luminosity collected with the CDF II detector and 5.2/fb of data from the D ... More
Presented by Craig GROUP on 12 Aug 2011 at 09:21
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
We present a search for Higgs boson produced in the di-tau modes or via the associated h+b->tau-tau+b process at a center-of-mass energy of 1.96 TeV using data collected with the CDF and D0 detectors at the Fermilab Tevatron collider. In Supersymmetric models the Higgs boson production cross section can be significantly enhanced compared to the Standard Model; additionally the Higgs boson has a si ... More
Presented by Subhendu CHAKRABARTI on 12 Aug 2011 at 09:00
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
We present a search for a new particle T' decaying to a top quark via T'-> t + X, where X goes undetected. We use a data sample corresponding to 5.7 inverse fb of integrated luminosity of ppbar collisions with sqrt(s) = 1.96 TeV, collected at Fermilab Tevatron by the CDF II detector. Our search for pair production of T' is focused on the hadronic decay channel, ppbar -> T'Tbar' -> ttbar + XX -> bq ... More
Presented by Marco BENTIVEGNA on 9 Aug 2011 at 17:40
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
With 7 TeV proton-proton collisions data collected by the ATLAS detector we present searches for anomalous top-quark production and decay in several channels , including a search for top-quark pair production with anomalous missing transverse energy, top-quark pair resonances, fourth generation quarks decaying to top quarks. Such phenomena can arise from a number of Standard Model extensions.
Presented by Tobias GOLLING on 11 Aug 2011 at 11:30
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
The results of searches for Supersymmetry in events with two same-sign isolated leptons, hadronic jets, and missing transverse energy in the final state are presented. The searches use pp collisions at 7 TeV collected in 2011 by the CMS experiment.
Presented by Marc Gabriel WEINBERG on 10 Aug 2011 at 16:30
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
Leptoquarks are hypothetical particles carrying both lepton and quark flavor. They are predicted by Grand Unified Theories, technicolor and composite models among others. Results from the searches for pair production of first and second generation leptoquarks at the CMS experiment with 7 TeV data are presented.
Presented by Emanuela BARBERIS on 12 Aug 2011 at 11:50
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
We report on searches for supersymmetry in events with one, two or multi-lepton final states with the 2011 data from the ATLAS experiment. In case of no excess observed a 95% CL upper limit is set for squark and gluino masses for different signal models. A 95% CL limit on the cross section times branching ratios times efficiency is set for different final states under study.
Presented by Tapas SARANGI on 9 Aug 2011 at 16:20
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
We present a search for the Standard Model Higgs boson produced via the H->WW*->lvjj and H->ZZ*->4l processes at a center-of-mass energy of 1.96 TeV using up to 8.5 fb-1 of data collected with the D0 and CDF detectors at the Fermilab Tevatron collider. We search in events with either four charged leptons, or two jets, one charged lepton, and missing transverse energy. The four lepton channel provi ... More
Presented by Savanna SHAW on 9 Aug 2011 at 14:23
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
Recent searches conducted at the Fermilab Tevatron for the Higgs boson in the diphoton decay channel are reported using 7.0/fb and 8.2/fb of data collected at the CDF and D0 experiments respectively. Although the standard model (SM) branching fraction is small, the diphoton final state is appealing due to better diphoton mass resolution compared with dijet final states. In addition, other mode ... More
Presented by Karen BLAND on 9 Aug 2011 at 16:23
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
The SM Higgs boson in the medium and high mass ranges has a large branching ratio for decays to a pair of neutral weak bosons. Three decay modes of the Z boson pair have been explored by ATLAS. One Z is typically produced on-shell, which can be tagged using leptonic decay products. The decay of the second Z(*) leads to three independent search channels: llqq, llvv and llll. Background compositio ... More
Presented by G CARRILLO MONTOYA on 9 Aug 2011 at 14:00
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
Several Beyond the Standard Model (BSM) theories predict the existence of new resonances that decay into ttbar pairs. We describe a search for such resonances using lepton plus jet data collected by the ATLAS experiment in pp collisions at Sqrt(s)=7 TeV. The selection criteria and search method are presented. In the absence of signal, we produce 95% CL limits on the production cross sectio ... More
Presented by Venkatesh KAUSHIK on 10 Aug 2011 at 16:50
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
We present a search for universal extra dimensions (UED) and supersymmetry (SUSY) in the two like-sign muons final state. The data set corresponds to an integrated luminosity of 7.3 fb-1 collected by the D0 detector at a $p\bar{p}$ center of mass energy of 1.96 TeV at the Fermilab Tevatron Collider. No evidence for physics beyond the standard model is observed and limits are set on the size of the ... More
Presented by Jason MANSOUR on 10 Aug 2011 at 17:30
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
We report on the various SM and BSM Higgs Boson searches conducted by the CMS experiment with the data accumulated during the 2010 & 2011 running of the LHC at sqrt(s) = 7 TeV.
Presented by Dr. Marat GATAULLIN on 11 Aug 2011 at 11:30
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by Krishna KUMAR, on 9 Aug 2011 at 11:45
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
The study of diboson production at high energy colliders tests the electroweak sector of the standard model (SM) and provides a sensitive probe of new physics beyond the SM. An important example is the production of a Higgs boson with mass greater than 140 GeV/c^2 which decays primarily to W boson pairs. The diboson decay channel where one W boson decays to leptons and the other vector boson decay ... More
Presented by Mark NEUBAUER on 10 Aug 2011 at 18:15
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
Results of searches for Large Extra Dimensions (LED) in pp collisions at the center-of-mass energy of 7 TeV with the CMS detector are presented. Having analyzed the full 2011 dataset, we found no excess of events above the standard model (SM) expectations. We set stringent limits on the multi dimensional Planck scale as well as masses of exotic objects that are consequences of the LED.
Presented by Alexey FERAPONTOV on 10 Aug 2011 at 15:00
Type: Parallel contribution Session: Low Energy Searches for Physics Beyond the Standard Model
Track: Low Energy Searches for Physics Beyond the Standard Model
We present the results of direct searches for light new physics with BABAR. In particular, we describe studies of narrow Upsilon and B decays with sensitivity to possible light pseudoscalar Higgs bosons and invisibly decaying dark matter candidates. We also present results of searches for hidden sector gauge and Higgs bosons.
Presented by Christopher HEARTY on 12 Aug 2011 at 10:30
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
The discovery of a new type of a heavy long-lived particle (LLP) would be of fundamental significance, since no such particles exist in the Standard Model. LLPs are anticipated in a wide range of physics models which extend the Standard Model, such as supersymmetry (SUSY) and universal extra dimensions. Since LLPs produced in the 7 TeV pp collisions at the CERN LHC can be slow (beta<<1) and penetr ... More
Presented by Vivek JAIN on 12 Aug 2011 at 11:10
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
We present recent BABAR results of searches for rare decays with new physics sensitivity. In particular, we present the results of searches for B -> gammma gamma and the lepton and baryon number violating modes B->Lambda(c)l and B->K/pi tau l. We also describe recent searches for the charm decays D-> Xl+l-, D0 -> gamma gamma and D0->l+l-.
Presented by Alessandro ROSSI on 11 Aug 2011 at 10:30
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
We present the results of searches for Supersymmetry in various topologies that lead to final states with jets, missing transverse momentum and one or two photons or a photon and a lepton. These searches are performed using data collected by the CMS experiment at the LHC in pp-collisions at a center-of-mass energy of 7 TeV. Various data-driven techniques used to measure the Standard Model backgrou ... More
Presented by Duong Hai NGUYEN on 10 Aug 2011 at 15:40
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
We present the results of searches for Supersymmetry in various topologies that lead to one or more isolated leptons, jets, and missing transverse energy in the final state. The searches are performed using data collected by the CMS experiment at the LHC in pp-collisions at a center-of-mass energy of 7 TeV. Various data-driven techniques used to measure the Standard Model backgrounds are discussed ... More
Presented by Benjamin Henry HOOBERMAN on 9 Aug 2011 at 16:40
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
We present the results of searches for Supersymmetry in all-hadronic final states with jets and missing transverse energy, including the cases of jets identified as b-jets, the decay products of top quarks and hadronically decaying tau leptons. The searches are performed using data collected by the CMS experiment at the LHC in pp-collisions at a center-of-mass energy of 7 TeV. Various data-driven ... More
Presented by Sudarshan PARAMESVARAN on 9 Aug 2011 at 16:00
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
We present searches for the standard model Higgs boson produced via the VH->VWW->leptons+X process at a center-of-mass energy of 1.96 TeV with the CDF and D0 detectors at the Fermilab Tevatron Collider. We require either two like charge-signed leptons (electron or muon) or three charged leptons (electron or muon). These channels provide significant sensitivity in the intermediate Higgs boson mas ... More
Presented by Michael COOKE on 9 Aug 2011 at 17:08
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
We present the results of three searches for new physics in ppbar collisions at sqrt(s)=1.96 TeV using up to 5.4 fb-1 of data collected with the D0 detector at the Fermilab Tevatron collider. We search for hypothetical vector-like quarks which decay into a W or a Z boson and one additional jet, for first generation leptoquarks using the final state with two jets, one electron and missing transvers ... More
Presented by Lidija ZIVKOVIC on 12 Aug 2011 at 12:10
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
Coherent elastic neutrino- and WIMP-nucleus interaction signatures are expected to be quite similar. Next-generation ton-scale dark matter detectors could discover neutrino-nucleus coherent scattering in an underground laboratory. A high intensity pion- and muon- decay-at-rest neutrino source recently proposed for oscillation physics at underground laboratories would provide the neutrinos for thes ... More
Presented by Prof. Enectali FIGUEROA-FELICIANO on 12 Aug 2011 at 11:30
Type: Parallel contribution Session: Perturbative and non-Perturbative QCD
Track: Perturbative and non-Perturbative QCD
I present generalized formulas for approximate corrections to QCD hard-scattering cross sections through second order in the perturbative expansion. The approximate results are based on recent two-loop calculations for soft and collinear emission near threshold and are illustrated by several applications to strong-interaction processes in hadron colliders.
Presented by Prof. Nikolaos KIDONAKIS on 10 Aug 2011 at 14:40
Type: Poster Session: Poster Session
Track: Poster Session
The unusual multiplet structures associated with the light spin zero mesons have recently attracted a good deal of theoretical attention. Here we present some aspects associated with the possibility of getting new experimental information on this topic from semi-leptonic decays of heavy charged mesons into an isosinglet scalar or pseudoscalar plus leptons.
Presented by Muhammad SHAHID on 9 Aug 2011 at 12:42
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
We present recent results of studies of semileptonic B and charm decays from BABAR. In particular, we describe a recent measurement of the B-> D(*)tau nu branching fraction, and a study of Bs production and semileptonic decays using BABAR data collected above the Upsilon(4S). We also discuss the determination of |Vub| from exclusive B->pi/rho l nu and and from fully inclusive measurements ... More
Presented by Brian HAMILTON on 10 Aug 2011 at 17:30
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
The MiniBooNE experiment is a short baseline experiment designed to test whether the excess of $\bar{\nu}_e$ events observed in the LSND experiment is due to neutrino oscillations. If the LSND signal is due to neutrino oscillations it would imply Physics Beyond the Standard Model such as the existence of sterile neutrinos. In this talk I will briefly discuss the sterile neutrino oscillation models ... More
Presented by Dr. Zarko PAVLOVIC on 12 Aug 2011 at 10:30
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
From the discovery of the neutrino to the precision neutrino oscillation measurements in KamLAND, nuclear reactors have proven to be an important source of antineutrinos. As their power and our knowledge of neutrino physics has increased, more sensitive measurements have become possible. The next generation of reactor antineutrino experiments require more detailed simulation of the reactor core. M ... More
Presented by Dr. Lindley WINSLOW on 12 Aug 2011 at 11:10
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
We present measurements of the single top production cross in ppbar collisions at sqrt(s)=1.96 TeV using data collected with the D0 detector and corresponding to up to 5.4 fb-1 of integrated luminosity. We obtain both measurements of the inclusive production cross section as well measurements for the separate s- and t-channel production processes. These measurements are used to set constraints on ... More
Presented by Reinhard SCHWIENHORST on 10 Aug 2011 at 14:20
Type: Parallel contribution Session: Perturbative and non-Perturbative QCD
Track: Perturbative and non-Perturbative QCD
LHCb presents studies of particle production in minimum bias events in pp collisions at $\sqrt(s)$=7 TeV. These studies include measurements of strangeness production, particle ratios, baryon-antibaryon ratios and charged particle production. The forward coverage and low $p_T$ acceptance of the experiment makes these measurements very complementary to those performed by the central detector ... More
Presented by Alessandro CAMBONI on 12 Aug 2011 at 09:00
Type: Parallel contribution Session: Perturbative and non-Perturbative QCD
Track: Perturbative and non-Perturbative QCD
Studies of hadron production in pp collisions, including charged particle transverse momentum, pseudorapidity and event-by-event multiplicity distributions at sqrt(s) = 0.9, 2.36 and 7 TeV are shown. Measured spectra of identified strange hadrons, reconstructed based on their decay topology, are also presented. Comparisons to several QCD Monte Carlo models and tunes are discussed. Results on two-p ... More
Presented by Dr. Dayong WANG on 12 Aug 2011 at 16:00
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
We present neutrino oscillation results based on data samples from all four phases of the experiment (SK-1 through SK-4) over a 15 year running period. Atmospheric neutrino data spanning 5 orders of magnitude in neutrino energy and 4 orders of magnitude in baseline are used to constrain the mixing parameters of neutrino oscillation as well as search for non-standard effects. Solar neutrino data is ... More
Presented by Roger WENDELL on 9 Aug 2011 at 14:00
Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD
Track: Heavy Ion Physics/Hot and Dense QCD
We study the effect that initial state fluctuations have on final particle correlations in heavy ion collisions. More precisely, we focus on the propagation of initial perturbations on top of the expanding fireball using the conformal solution derived by Gubser and Yarom for central collisions. For small perturbations, the hydrodynamic equations are solved by separation of variables and the solu ... More
Presented by Pilar STAIG on 10 Aug 2011 at 15:40
Type: Parallel contribution Session: Particle Astrophysics and Cosmology
Track: Particle Astrophysics and Cosmology
Recent results from CoGeNT and future directions will be discussed.
Presented by Juan COLLAR COLMENERO on 10 Aug 2011 at 17:50
Type: Parallel contribution Session: Detector Technology and R&D
Track: Detector Technology and R&D
Summary of challenges, development, and prospects.
Presented by Dr. Jose REPOND on 10 Aug 2011 at 16:30
Type: Parallel contribution Session: Particle Astrophysics and Cosmology
Track: Particle Astrophysics and Cosmology
The Large Underground Xenon (LUX) experiment will facilitate direct detection of Weakly Interacting Massive Particles (WIMPs) with a 350 kg xenon TPC. LUX will be able to detect 100 GeV WIMPs with scalar cross section as low as 7e−46 cm2, equivalent to ~0.5 events/100 kg/month in a 100 kg inner fiducial volume. Electromagnetic background event rates are limited below 5e−4 events/keV/kg/day by ... More
Presented by Mr. Jeremy CHAPMAN on 10 Aug 2011 at 17:30
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
LBNE is an experiment being designed to probe the parameters of neutrino mixing accessible through nu_mu to nu_e oscillation measurements at the atmospheric L/E scale. It will consist of a new neutrino beam line and Near Detector complex at Fermilab, and one or more very large Far Detector modules, nominally to be sited underground in the Homestake Mine in South Dakota. In addition to the long-b ... More
Presented by Jon URHEIM on 9 Aug 2011 at 17:40
Type: Parallel contribution Session: Accelerator Physics
Track: Accelerator Physics
The SuperB international team continues to optimize the design of an electron-positron collider, which will allow the enhanced study of the origins of flavor physics. The project combines the best features of a linear collider (high single-collision luminosity) and a storage-ring collider (high repetition rate), bringing together all accelerator physics aspects to make a very high luminosity of 10 ... More
Presented by Dr. Walter WITTMER, on 9 Aug 2011 at 15:00
Type: Poster Session: Poster Session
Track: Particle Astrophysics and Cosmology
There is experimental evidence that Dark Matter (DM) makes up about 25\% of the Universe mass and is most likely non­relativistic. We explore possibility of creation and existence of bound states of Dark Matter and standard model (SM) particles. Such bound states can be potentially created and detected during direct DM search experiments (DAMA, CDMS, XENON etc.). We work in model-­independent ef ... More
Presented by Prof. Alexey PETROV on 9 Aug 2011 at 12:37
Type: Poster Session: Poster Session
Track: Field and String Theory
Employing the electroweak standard model(SM), we analyzed and discussed the framework form of electron mixing-loop chain propagator and its renormalization in detail; then achieved the analytic count. Based on it we acquired the analytic solution of electron mixing-loop chain propagator which composed of serious of different physical loops. This study would offer certain academic reference to the ... More
Presented by Dr. Haiyan TANG on 9 Aug 2011 at 12:39
Type: Parallel contribution Session: Field and String Theory
Track: Field and String Theory
If the string landscape has any validity, the universe has in the past and should in the future make transitions to other local (or absolute minima). A prime model for the physics of a future universe is the zero vacuum energy minimal supersymmetric standard model or one of its variations with all susy breaking terms put to zero. If we assume that this transition is accelerated in dense matter ... More
Presented by Prof. Louis CLAVELLI on 12 Aug 2011 at 16:40
Type: Parallel contribution Session: Field and String Theory
Track: Field and String Theory
We use gauge-gravity duality to study the behavior of strongly-coupled quarks moving on a black hole background. The supergravity background consists of a six-dimensional Schwarzschild-black string AdS soliton, for which the bulk horizon is a string that extends from the AdS boundary down to an infra-red floor. By going to higher energy scales, the regime of validity of the classical supergravity ... More
Presented by Prof. Justin VAZQUEZ-PORITZ on 12 Aug 2011 at 10:50
Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD
Track: Heavy Ion Physics/Hot and Dense QCD
Jets are an important tool to probe the hot, dense medium which is produced in ultra-relativistic heavy ion collisions. Copious production of hard processes, well above the heavy ion background, occurs at the Large Hadron Collider due to the large increase in collision energy. The multipurpose Compact Muon Solenoid (CMS) detector is well designed to measure the hard scattering processes with its h ... More
Presented by george STEPHANS on 10 Aug 2011 at 17:30
Type: Parallel contribution Session: Detector Technology and R&D
Track: Detector Technology and R&D
The readout systems for the ATLAS silicon trackers and liquid argon calorimeters utilize vertical-cavity surface-emitting laser (VCSEL) diodes to communicate between on and off detector readout components. A number of these VCSEL devices have ceased to function well before their expected lifetime. We summarize the failure history and present what has been learned so far about the possible causes ... More
Presented by Mark COOKE on 9 Aug 2011 at 17:40
Type: Parallel contribution Session: Electroweak Physics
Track: Electroweak Physics
We use up to 7.3 fb-1 of ppbar collisions collected with the D0 detector study different differential distributions for Z/gamma* produced in ppbar collisions at the Tevatron collider. In one study we investigate the transverse momentum distribution of the Z/gamma* boson by using a novel observable that has reduced sensitivity to the effects of experimental resolution and efficiency, allowing detai ... More
Presented by Rafael LOPES DE SA on 9 Aug 2011 at 16:20
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
We present studies from the LHCb experiment of decays of the type $h_b \to h_c X$, where $h_b$ represents a beauty hadron ($B^\pm$, $B^0$ or $\Lambda_b$) and $h_c$ a charmed hadron ($D^0$, $D(*)^+$, $D_s$ or $\Lambda_c$). Such decays are important for the determination of the CKM angle $\gamma$, a key goal of the LHCb physics programme. We exploit the data accumulated in 2010, and in the e ... More
Presented by Stefania RICCIARDI on 12 Aug 2011 at 11:36
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
Studies of charmless hadronic decays of B mesons have high sensitivity to possible contributions from New Physics. Precision measurements involving these decays with charged hadrons in the final state are being performed at LHCb, notably those of CP-violating asymmetries. These measurements benefit from a trigger system which is very efficient for hadronic final states and excellent parti ... More
Presented by Paul Douglas SAIL on 12 Aug 2011 at 10:52
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
LHCb results will be presented of studies made of the production of $c\bar{c}$ and $b\bar{b}$ states in $pp$ collisions at $\sqrt{s} = 7$~TeV. The range and precision of these measurements will be invaluable in discriminating between theoretical models. Results and prospects will also be shown for so-called exotics, such as the X(3872).
Presented by Luigi LI GIOI on 9 Aug 2011 at 14:00
Type: Parallel contribution Session: Perturbative and non-Perturbative QCD
Track: Perturbative and non-Perturbative QCD
This talk describes minimum bias measurements using proton proton collisions at the ATLAS detector at the LHC at center of mass energies of 900 GeV and 7 TeV. Studies of charged particle multiplicity distributions and multiparticle correlations which are used to investigate soft QCD processes are presented. The measurements are compared with various theoretical models and Monte Carlo generators.
Presented by Dr. Rishiraj PRAVAHAN on 12 Aug 2011 at 08:20
Type: Parallel contribution Session: Electroweak Physics
Track: Electroweak Physics
We have used the ATLAS detector to study W and Z bosons produced with high energy photons in pp collisions at sqrt(s) = 7 TeV. We select Wgamma and Zgamma events from the interactions p+p -> l + nu + gamma + X and p+p -> l + l + gamma + X where the lepton is a muon or electron. The photon is required to be isolated and separated from the lepton(s) by dR(l-gamma)>0.7. The measurement is based upo ... More
Presented by Prof. Al GOSHAW on 10 Aug 2011 at 15:10
Type: Parallel contribution Session: Electroweak Physics
Track: Electroweak Physics
We report on the study the diboson production (WW, WZ, ZZ) at CMS based on the data collected during the 2010+2011 running of the LHC.
Presented by Kalanand MISHRA on 12 Aug 2011 at 11:50
Type: Parallel contribution Session: Detector Technology and R&D
Track: Detector Technology and R&D
Hybrid silicon pixel detectors are currently used in the innermost tracking system of the Compact Muon Solenoid (CMS) experiment. Radiation tolerance up to fluences expected for a few years of running of Large Hadron Collider (LHC) has already been proved, although some degradation of the part of the silicon detector closer to the interaction point is expected. During the LHC upgrade phases, the l ... More
Presented by gemma TINTI on 9 Aug 2011 at 17:00
Type: Parallel contribution Session: Particle Astrophysics and Cosmology
Track: Particle Astrophysics and Cosmology
The Dark Energy Survey (DES) will use a new massive imaging instrument, the Dark Energy Camera (DECam), to study the properties of the mysterious, presently-dominant source of energy that is causing the universe to go through an accelerating expansion. The camera will be installed on the 4-meter Blanco telescope at the Cerro Tololo Inter-American Observatory and commissioning is expected to ... More
Presented by Masao SAKO on 11 Aug 2011 at 10:50
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
The minimal supersymmetric standard model (MSSM) is extended by the inclusion of an addition pair of constrained Higgs doublet superfields through which the electroweak symmetry breaking is nonlinearly realized. The superpotential coupling to the MSSM Higgs doublet then generates its vacuum expectation value. The resultant Higgs scalars and Higgsino-gaugino mass spectrum is presented for several c ... More
Presented by Sherwin LOVE on 11 Aug 2011 at 10:30
Session: Plenary Session
on 13 Aug 2011 at 10:45
Presented by Ian SHIPSEY, Marcel DEMARTEAU on 12 Aug 2011 at 14:00
Type: Parallel contribution Session: CP-Violation
Track: CP-Violation
We report recent BABAR results of CP violation studies in D+->Ks0pi+, D+ ->Ks0 h+h+h- and tau -> Ks0pinu.
Presented by Ryan WHITE on 12 Aug 2011 at 16:20
Type: Parallel contribution Session: Particle Astrophysics and Cosmology
Track: Particle Astrophysics and Cosmology
Cosmic inflation provides a mechanism for generating the early density perturbations that seeded the large-scale structures we see today. Primordial non-Gaussianity is among the most promising of few observational tests of physics at this epoch. At present non-Gaussianity is best constrained by the cosmic microwave background, but in the near term large-scale structure data may be competitive so l ... More
Presented by Dr. Marilena LOVERDE on 12 Aug 2011 at 08:40
Type: Parallel contribution Session: Accelerator Physics
Track: Accelerator Physics
The success of Tevatron Run II is based on advances in accelerator physics, as well as on the excellence and advances in engineering, instrumentation and machine operation. We review the main advances in accelerator physics which contributed to the luminosity growth and/or improvement of the Tevatron complex operations, and discuss their applicability to future colliders.
Presented by Mr. Valeri LEBEDEV on 9 Aug 2011 at 14:00
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
We present a measurement of the cross section for the simultaneous production of two vector bosons (WZ,ZZ), where one of the bosons decays leptonically (W->lv, Z->ll or Z->vv) and the other Z boson decays to bottom quarks. The measurement uses up to 8.5 fb-1 of data collected with the D0 and CDF detectors in proton-antiproton collisions at 1.96 TeV, and combines the three leptonic decay modes men ... More
Presented by Gabriel FACINI on 12 Aug 2011 at 12:02
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
We review briefly the R&D effort that went into the construction of the 600 Ton Liquid Argon TPC. The detector is operating very well with electron drift distances near 4m. The detector is exposed to the CNGS beam from CERN and is collecting neutrino events. More than 130 Neutrino events have been observed. Other physics goals include exotic proton decay and sterile neutrinos. ICARUS is also a pro ... More
Presented by Prof. David CLINE on 9 Aug 2011 at 17:20
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
I present the latest result from the ATLAS search for resonant production of new particles decaying in two jets, using data taken in 2011.
Presented by Dr. Georgios CHOUDALAKIS on 10 Aug 2011 at 14:00
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
The ArgoNeuT project features a 175 liter Liquid Argon (LAr) Time Projection Chamber (TPC) that was located upstream of the MINOS near detector in the NuMI neutrino beam at Fermilab. The project is part of the LAr TPC development program in the US and has helped initiate the development of simulation and reconstruction tools for LAr TPCs. In addition to the development goals, ArgoNeuT will perfor ... More
Presented by Roxanne GUENETTE on 12 Aug 2011 at 16:00
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
I will give a theoretical perspective on the topic of symmetry and symmetry breaking, particularly as the basis of the electroweak theory at the time of the initial formulation and development of the Standard Model. I will also briefly discuss some of these ideas restated in more modern terms.
Presented by Prof. Gerald GURALNIK on 10 Aug 2011 at 14:00
Type: Parallel contribution Session: Low Energy Searches for Physics Beyond the Standard Model
Track: Low Energy Searches for Physics Beyond the Standard Model
Presented by Mark LANCASTER on 10 Aug 2011 at 16:30
Type: Parallel contribution Session: Perturbative and non-Perturbative QCD
Track: Perturbative and non-Perturbative QCD
Recently, the charge radius of the proton was extracted, for the first time, from muonic hydrogen. The value was 5 sigma away from similar measurement of regular hydrogen. The extraction of the charge radius depends on a theoretical input. Together with Richard J. Hill, we are studying the hadronic uncertainty in the theoretical prediction, using the tool of an effective field theory, namely NRQED ... More
Presented by Dr. Gil PAZ on 11 Aug 2011 at 11:50
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
Upper limits on the cross section of Standard Model Higgs boson production at the Large Hadron Collider (LHC) running at a centre-of-mass energy of 7 TeV are determined, based on the searches performed by the ATLAS Collaboration. Models with a fourth generation of heavy leptons and quarks with Standard Model-like couplings to the Higgs boson are also investigated.
Presented by Haichen WANG on 11 Aug 2011 at 11:05
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
NOvA is an accelerator neutrino oscillation experiment which has a great potential to measure the last unknown mixing angle theta_{13}, the neutrino mass hierarchy, and the CP-violation phase in lepton sector with 1) 700 kW beam, 2) 14 mrad off the beam axis, 3) 810 km baseline. The Near Detector on the Surface is fully functioning and taking both NuMI and Booster beam data. The far detector buil ... More
Presented by Dr. Xinchun TIAN on 12 Aug 2011 at 08:20
Type: Parallel contribution Session: Particle Astrophysics and Cosmology
Track: Particle Astrophysics and Cosmology
The Dark Energy Survey (DES) is a next generation optical survey aimed at understanding the expansion rate of the universe using four complementary methods: weak gravitational lensing, galaxy cluster counts, baryon acoustic oscillations, and Type Ia supernovae. To perform the survey, the DES Collaboration is building the Dark Energy Camera (DECam), a 3 square degree, 520 Megapixel CCD camera which ... More
Presented by Dr. Jiangang HAO on 11 Aug 2011 at 11:10
Type: Parallel contribution Session: Particle Astrophysics and Cosmology
Track: Particle Astrophysics and Cosmology
The Dark Energy Survey (DES) is a project with the goal of building, installing and exploiting a new 70 CCD-camera at the Blanco telescope, in order to study the nature of cosmic acceleration. It will cover 5000 square degrees of the southern hemisphere sky and will record the positions and shapes of 300 million galaxies up to redshift 1.4. The survey will be completed using 525 nights during a 5 ... More
Presented by Mr. Ignacio SEVILLA on 11 Aug 2011 at 10:30
Type: Parallel contribution Session: Particle Astrophysics and Cosmology
Track: Particle Astrophysics and Cosmology
DarkSide is a direct detection dark matter program based on two-phase argon time projection chambers using argon from underground sources that is naturally depleted in 39Ar. DarkSide-50, the first physics detector in the DarkSide program, will be deployed within the Borexino CTF tank in Gran Sasso Laboratory, Italy. The unique combination of the CTF muon veto, ultra-low background construction tec ... More
Presented by Alex WRIGHT on 10 Aug 2011 at 16:50
Type: Parallel contribution Session: Low Energy Searches for Physics Beyond the Standard Model
Track: Low Energy Searches for Physics Beyond the Standard Model
The Enriched Xenon Observatory (EXO) is an experimental program designed to search for the neutrinoless double beta decay (0nbb) of Xe-136. Observation of 0nbb would determine an absolute mass scale for neutrinos, prove that neutrinos are massive Majorana particles (indistinguishable from their own antiparticles), and constitute physics beyond the Standard Model. The current phase of the experimen ... More
Presented by Timothy DANIELS on 10 Aug 2011 at 17:50
Type: Parallel contribution Session: Electroweak Physics
Track: Electroweak Physics
Higher-order diagrams required for radiative corrections to mixed electroweak and QCD processes at the LHC and anticipated future colliders will require numerically stable representations of the associated Feynman diagrams. The hypergeometric representation supplies an analytic framework that is useful for deriving such stable representations. We discuss the reduction of Feynman diagrams to maste ... More
Presented by Prof. Scott YOST on 10 Aug 2011 at 15:30
Type: Parallel contribution Session: Low Energy Searches for Physics Beyond the Standard Model
Track: Low Energy Searches for Physics Beyond the Standard Model
Fermilab E989 has the goal to improve on the precision of the muon anomalous magnetic moment, a_mu = (g_mu - 2)/2 by at least a factor of 4 beyond the 0.54~ppm relative precision obtained in E821 at Brookhaven. The precision storage ring will be relocated to Fermilab and installed in a new building. A new 8~GeV/c proton beamline and 3.1~GeV/c muon beamline will be built. The unique capabilities ... More
Presented by Bradley Lee ROBERTS on 10 Aug 2011 at 17:30
Type: Parallel contribution Session: Field and String Theory
Track: Field and String Theory
The study of QCD at finite baryon density is severely hampered by the so-called fermion sign problem. As a result, we have no known first principles approach to study nuclear matter, or neutron stars from QCD. On the surface, the large Nc limit does not seem to simplify matters. In this limit, however, one can exploit dualities that exist between strongly coupled gauge theories. I will focus on so ... More
Presented by Dr. Brian TIBURZI on 12 Aug 2011 at 10:30
Type: Plenary contribution Session: Public lecture: The Frontier of Physics and Beyond
The Large Hadron Collider at CERN, Switzerland, is the largest scientific instrument ever built. It may alter our perception of the basic laws of Nature. In this talk, I describe why we think, hope, the Large Hadron Collider will tell us something decisive about the frontier of physics and beyond. Potential discoveries may include new forces of nature, new dimensions of space and time, or new stat ... More
Presented by Harrison PROSPER on 12 Aug 2011 at 18:00
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
The MINERvA experiment is aimed at precisely measuring the cross-sections for various neutrino interaction channels. It is located in Fermilab in an underground cavern in front of the MINOS near detector. MINERvA is a finely-grained scintillator with electromagnetic and hadron calorimetry regions. There are various nuclear targets located inside and in front of the detector for studying nuclear me ... More
Presented by Bari OSMANOV on 10 Aug 2011 at 15:00
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
The Demonstrator will comprise two cryostats containing a total of 70,p-type point-contact Ge detectors. The Collaboration is acquiring 45 -kg of Ge enriched to more than 86% in Ge-76. The goal is to have at least 20-kg of enriched germanium in detectors. The remaining space in the cryostats will be occupied by at least 20-kg of natural abundance Ge detectors. The two detector arrays will be ope ... More
Presented by Frank AVIGNONE on 12 Aug 2011 at 09:40
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
The MicroBooNE experiment is a 170 ton Liquid Argon Time Projection Chamber (LArTPC) which will begin running at Fermilab in 2013. It's primary physics goal is to explore the low energy excess of events seen by the MiniBooNE experiment and it is the next step in the R&D to make LAr a viable option for future large neutrino detectors. This talk will present an overview of the MicroBooNE experimen ... More
Presented by Christina IGNARRA on 12 Aug 2011 at 16:30
Type: Parallel contribution Session: Particle Astrophysics and Cosmology
Track: Particle Astrophysics and Cosmology
The MiniCLEAN dark matter experiment exploits a single-phase liquid argon (LAr) detector, instrumented with photomultiplier tubes submerged in the cryogen with nearly 4pi coverage of a 500 kg (150 kg) target (fiducial) mass. The high light yield and unique properties of the scintillation time-profile in LAr provide effective defense against radioactive backgrounds through pulse-shape discriminatio ... More
Presented by Dr. Andrew HIME on 10 Aug 2011 at 16:30
Type: Parallel contribution Session: Low Energy Searches for Physics Beyond the Standard Model
Track: Low Energy Searches for Physics Beyond the Standard Model
The goal of the Mu2e experiment is to improve on the existing experimental limits for the neutrinoless conversion of a muon into an electron by four orders of magnitude. Such sensitivity means that if low-energy supersymmetry is discovered at the LHC, Mu2e will provide complimentary information. Even in the absence of new physics at the TeV scale, Mu2e could still find evidence for new physics a ... More
Presented by Prof. Craig GROUP on 10 Aug 2011 at 16:50
Type: Parallel contribution Session: Education and Outreach
Track: Education and Outreach
Can exposure to fundamental ideas about the nature of matter help motivate children in math and science and support the development of their understanding of these ideas later? Physicists, designers, and museum educators at the University of Kansas created the Quarked!™ Adventures in the subatomic Universe project to provide an opportunity for youth to explore the subatomic world in a fun and us ... More
Presented by Prof. Alice BEAN on 9 Aug 2011 at 17:30
Type: Parallel contribution Session: Perturbative and non-Perturbative QCD
Track: Perturbative and non-Perturbative QCD
We introduce a systematic approach for the resummation of perturbative series which involve large logarithms not only due to large invariant mass ratios but large rapidities as well. Series of this form can appear in a variety of gauge theory observables. The formalism is utilized to calculate the jet broadening event shape and and transverse momentum ($p_T$) distributions in a systematic fashion ... More
Presented by Dr. Jui-Yu CHIU on 9 Aug 2011 at 15:10
Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD
Track: Heavy Ion Physics/Hot and Dense QCD
The centrality dependence of the low pt ridge correlations exhibits an interesting centrality dependence: it rises quickly with centrality but then in the most central collisions falls again. This centrality dependence is seen for 62.4 GeV, 200 GeV, and 2.76 TeV data. In this talk, I discuss how the rise and fall of the ridge demonstrates that the ridge is connected to the initial eccentricity. I ... More
Presented by Dr. Paul SORENSEN on 10 Aug 2011 at 14:25
Type: Parallel contribution Session: Hadron Spectroscopy
Presented by Dr. Dennis WEYGAND on 12 Aug 2011 at 08:00
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
The forward-backward asymmetry for top quarks measured in proton-antiproton collisions at the Tevatron shows a large deviation from standard model expectations. Among possible interpretations, the exchange of a non-universal $Z^\prime$ is of some interest as it naturally predicts a top quark in the forward region of large rapidity. To reproduce the size of the Tevatron asymmetry, the couplings ... More
Presented by Dr. Edmond BERGER on 11 Aug 2011 at 10:50
Type: Parallel contribution Session: Computing in HEP
Track: Computing in HEP
DRAFT We discuss the US ATLAS experience in deploying, integrating and operating a set of distributed computing centers into a single, logical computing facility suitable to meet the simulation and analysis requirements for the first years of LHC physics. Particular attention is paid to the Tier 2 layer in the LHC computing hierarchy, which is a focal point of activity supporting centrally man ... More
Presented by Dr. Robert W GARDNER on 12 Aug 2011 at 10:50
Type: Poster Session: Poster Session
Track: Beyond the Standard Model
A model of Sakharov (1967) baryo-genesis where the 5th , compactified, dimension of Kaluza-Klein (1926) theory does ‘double duty’ as the creator of lepton-baryon numbers and creator of separate EM and gravity equations is proposed. The appearance of the compactified dimension breaks the symmetry of the Planckian vacuum, allowing the vacuum quantities hbar, G, and c to generate the particle q ... More
Presented by Dr. john BRANDENBURG on 9 Aug 2011 at 12:34
Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD
Track: Heavy Ion Physics/Hot and Dense QCD
We present the energy density and flux distribution of a quark moving through the high temperature QCD plasma and compare it with that in strongly coupled N=4 SYM plasma. The Boltzmann equation is reformulated as a Fokker-Planck equation at leading log approximation and is solved numerically with non-trivial boundary conditions in momentum space. We use the kinetic theory and take the Fourier t ... More
Presented by JUHEE HONG on 10 Aug 2011 at 18:25
Type: Parallel contribution Session: Low Energy Searches for Physics Beyond the Standard Model
Track: Low Energy Searches for Physics Beyond the Standard Model
We have obtained a very accurate proton charge distribution radius by measuring the 2s-2p Lamb shift in muonic hydrogen[1]. The value we found, 0.84184(67)fm is roughly 10 times more accurate than the ones derived from either hydrogen spectroscopy or electron-proton elastic scattering. It is 5 standard deviations away from the CODATA 2008 value 0.8768(69) fm, which combines both types of measureme ... More
Presented by Prof. Paul INDELICATO on 12 Aug 2011 at 10:50
Type: Poster Session: Poster Session
Track: Poster Session
A new theory of the EW interactions without spontaneous symmetry breaking, Higgs, and Fadeev-Popov procedure is presented in this talk. It consists of three parts: $SU(2)_L\times U(1)$ gauge fields, massive fermion fields, and their interactions. New mechanism of $SU(2)_L\times U(1)$ symmetry breaking caused by the fermion masses are found. Nonperturbative solutions are found. The vacuum polari ... More
Presented by Bing An LI on 9 Aug 2011 at 12:35
Type: Parallel contribution Session: Neutrino Physics
Track: Neutrino Physics
A three-parameter model of neutrino oscillations is presented. It is based on a simple Lorentz- and CPT-violating texture and is consistent with compelling oscillatory signals and null tests involving atmospheric, accelerator, reactor, and solar neutrinos. The solar and atmospheric mixing angles are fixed by the texture at both low and high energies instead of being independent parameters as in mo ... More
Presented by Jorge S DIAZ on 11 Aug 2011 at 12:10
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
We show that the a_1-rho-pi Lagrangian is a decisive element for obtaining a good phenomenological description of the three-pion decays of the tau lepton. We choose it in a two-component form with a flexible mixing parameter sin(theta). In addition to the dominant a_1-> rho+pi intermediate states, the a_1-> sigma+pi ones are included. When fitting the three-pion mass spectra, three data sets are e ... More
Presented by Prof. Peter LICHARD on 11 Aug 2011 at 11:58
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by Kirsten Anne TOLLEFSON on 13 Aug 2011 at 11:00
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
I present theoretical results for the top quark pair total cross section, and for the top quark transverse momentum and rapidity distributions at Tevatron and LHC energies. I also present results for single top quark production in the t- and s-channels and also via associated production with a W boson. The calculations include approximate NNLO corrections that are derived from NNLL soft-gluon resu ... More
Presented by Prof. Nikolaos KIDONAKIS on 9 Aug 2011 at 16:40
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
I would like to present results for hadronic top quark pair production in association with a photon at next-to-leading order accuracy.This process allows a direct measurement of the top quark electromagnetic couplings that, at the moment, are only loosely constraint. Top quark decays are treated in the narrow width approximation and spin correlations of all final state particles are accounted for. ... More
Presented by Markus SCHULZE on 12 Aug 2011 at 08:00
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
We give an overview of the most recent results on top quark properties and interactions, obtained using data collected with the CMS experiment during the years 2010-2011 at 7 TeV center-of-mass energy. Measurements are presented for both the inclusive top pair production cross section, using the dilepton, lepton+jets, hadronic and tau channels, as well as for various differential cross sections. T ... More
Presented by Prof. Karl ECKLUND on 9 Aug 2011 at 14:50
Type: Parallel contribution Session: Top Quark Physics
Track: Top Quark Physics
Models with a non-universal Z' exhibit in general flavor changing neutral currents FCNC at tree-level. When the Z' couplings favor the third generation, flavor changing transitions of the form Z'tc and Z'tu could be large enough to be observable at the LHC. In this talk I will discuss some interesting LHC signatures of (a) associated production of a top with the Z', and, (b) the same sign tops whe ... More
Presented by Dr. Sudhir GUPTA on 11 Aug 2011 at 11:50
Type: Parallel contribution Session: Accelerator Physics
Track: Accelerator Physics
For a fixed size of a circular collider, its energy is limited by the strength of bending dipole magnets. Moreover, for both linear and circular machines, their maximum luminosity is determined (among other factors) by the strength of quadrupole magnets used for the final beam focusing. That is why there has been a permanent interest to higher-field and higher-field gradient accelerator magnets fr ... More
Presented by Dr. Alexander ZLOBIN on 10 Aug 2011 at 17:00
Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD
Track: Heavy Ion Physics/Hot and Dense QCD
Jet quenching parameter or, equivalently, transverse momentum broadening distribution function is an important quantity which helps to understand energy losses in heavy ion collisions and get insights into properties of the de-confined quark-gluon plasma. SCET provides framework to calculate jet quenching parameter at weak coupling using expectation value of two space-like separated light-like Wil ... More
Presented by Mr. Mindaugas LEKAVECKAS on 11 Aug 2011 at 12:00
Type: Parallel contribution Session: Field and String Theory
Track: Field and String Theory
We consider relativistic QCD plasma containing charged chiral fermions in an external magnetic field, e.g a chirally symmetric quark-gluon plasma created in relativistic heavy ion collisions. In the presence of net axial charges, there is an induced electromagnetic current along the magnetic field due to triangle anomaly: this is Chiral Magnetic Effect (CME). We discuss CME in several complement ... More
Presented by Dr. Ho-Ung YEE on 12 Aug 2011 at 11:10
Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD
Track: Heavy Ion Physics/Hot and Dense QCD
Triangular flow has been shown to be an interesting new observable to gain insights about the properties of hot and dense strongly interacting matter as it is produced in heavy ion collisions at RHIC and LHC. We will present triangular flow results for Au+Au collisions at the highest RHIC energy calculated in a hybrid approach that includes a non-equilibrium initial evolution and an ideal hydrodyn ... More
Presented by Hannah PETERSEN on 9 Aug 2011 at 17:35
Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD
Track: Heavy Ion Physics/Hot and Dense QCD
We introduce a cummulant expansion to parameterize possible initial conditions in heavy ion collisions. We show that the cummulant expansion converges and can systematically reporduce the results of the Glauber type initial conditions. At third order in the gradient expansion, the cummulants are described with the triangularity $\llangle r^3 \cos3(\phi - \psi_{1,3} ) \rrangle$, and a dipole ... More
Presented by li YAN on 9 Aug 2011 at 17:15
Type: Parallel contribution Session: Beyond the Standard Model
Track: Beyond the Standard Model
A number of extensions of the Standard Model result in neutral and weakly-coupled particles that decay to multi hadrons or multi leptons with macroscopic decay lengths. These particles with decay lengths that can be comparable with ATLAS detector dimensions represent, from an experimental point of view, a challenge both for the trigger and for the reconstruction capabilities of the ATLAS detector. ... More
Presented by Steve ALKIRE on 12 Aug 2011 at 10:50
Type: Parallel contribution Session: Electroweak Physics
Track: Electroweak Physics
I present new results for the complete two-loop corrections in the soft approximation for W and Z boson production at large transverse momentum. Analytical expressions for the NNLO approximate transverse momentum distributions are derived. Results for W boson production at Tevatron and LHC energies are presented.
Presented by Prof. Nikolaos KIDONAKIS on 10 Aug 2011 at 14:00
Type: Parallel contribution Session: Particle Astrophysics and Cosmology
Track: Particle Astrophysics and Cosmology
Recent studies of the temperature anisotropy of the Cosmic Microwave Background (CMB) lend support to an inflationary origin of the universe, yet no direct evidence verifying inflation exists. Current generation experiments now focus on the polarization anisotropy in the CMB, specifically the curl component of the CMB’s polarization (called the “B-mode”), which is undetected to date. The the ... More
Presented by Ms. Stephanie MOYERMAN on 11 Aug 2011 at 11:30
Presented by Jon KOTCHER on 11 Aug 2011 at 12:50
Type: Parallel contribution Session: Heavy Ion Physics/Hot and Dense QCD
Track: Heavy Ion Physics/Hot and Dense QCD
We present measurements of untriggered di-hadron correlations as a function of centrality in Pb-Pb \sNN collisions, for charged hadrons with $p_{T} > 0.15$ GeV$/c$. These measurements provide a map of the bulk correlation structures in heavy-ion collisions. Contributions to these structures may come from jets, initial density fluctuations, elliptic flow, resonances, and/or momentum conservation. W ... More
Presented by Dr. Anthony Robert TIMMINS on 10 Aug 2011 at 14:50
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
Using fully reconstructed $B_{s}$ mesons, we measure the branching fractions for the decays of $B_s \to D_s^{(*)+}D_s^{(*)-}$ exclusively. Assuming these decay modes saturate decays to CP-even final states, the branching fraction determines the relative width difference between the $CP$-odd and $CP$-even $B_s$ states. The results are based on a data sample collected with the Belle detector at the ... More
Presented by Ms. Sevda ESEN on 11 Aug 2011 at 11:14
Type: Parallel contribution Session: CP-Violation
Track: CP-Violation
We present world-leading results on CP-violating asymmetries and branching fractions of several decay modes of B0, Bs , and Lambda_b hadrons into charmless two-body final states using 6/fb of data collected by the CDF experiment.
Presented by Benjamin CARLS on 11 Aug 2011 at 11:42
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
We report the latest results of a CDF search for B->mumu decays using 6.9/fb of data. Doubled statistics with respect to the previous iteration and several analysis improvement provide results that are the most sensitive from a single-experiment to date.
Presented by Kevin PITTS on 12 Aug 2011 at 08:32
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
We present updated measurements of branching fractions, polarization, and muon forward-backward asymmetry in B-->K mu mu final states using 6.7/fb of data collected by the CDF detector. A search for Lambda_b --> Lambda mu mu decays will also be shown. The results are the most sensitive from a single experiment to date.
Presented by Prof. Austin NAPIER on 10 Aug 2011 at 16:50
Type: Parallel contribution Session: Higgs Physics
Track: Higgs Physics
We report on the search for Standard Model (SM) Higgs boson to WW production in the final state of two charged leptons (e,mu) and two neutrinos from the collision of p-pbar pairs at sqrt(s) = 1.96 TeV. The data corresponds to 8.2 fb-1 by the CDF II detector and 8.2 fb-1 by the DZero detector on the Tevatron collider at Fermilab. The CDF version of the analysis implemented several improvements over ... More
Presented by Benjamin CARLS on 10 Aug 2011 at 17:54
Type: Parallel contribution Session: Detector Technology and R&D
Track: Detector Technology and R&D
Presented by Daniela BORTOLETTO on 9 Aug 2011 at 14:00
Type: Parallel contribution Session: Detector Technology and R&D
Track: Detector Technology and R&D
The next generation of neutrino experiments will require massive and/or high resolution detectors to reach the sensitivity needed to measure CP violation in the lepton sector and the neutrino mass hierarchy. Recently the Large Area Picosecond Photo Detectors (LAPPD) Collaboration has begun developing new methods to fabricate a 20cm-square thin planar multichannel plate photosensors. The applicatio ... More
Presented by Mayly SANCHEZ on 12 Aug 2011 at 11:35
Type: Parallel contribution Session: Electroweak Physics
Track: Electroweak Physics
Results are presented of W and Z boson production in pp collisions at $\sqrt(s)=7$ TeV by the LHCb experiment. These studies are of particular interest due to LHCb's unique forward acceptance in pseudo-rapidity ($\eta$) of 2 $< \eta <$ 5. The results may either be interpreted as a test of Standard Model predictions, or may be used to constrain better parton density functions in this kin ... More
Presented by Jonathan ANDERSON on 9 Aug 2011 at 15:20
Type: Parallel contribution Session: Electroweak Physics
Track: Electroweak Physics
We present a precise measurement of W boson mass measurement in electron decay channel using data collected by the D0 detector at the Fermilab Tevatron collider. A binned likelihood fit method is used to extract the mass information from the transverse mass, the electron transverse momentum and missing transverse energy distributions. We also present a precise direct measurement of W boson wi ... More
Presented by Daniel BOLINE on 10 Aug 2011 at 14:50
Type: Parallel contribution Session: Electroweak Physics
Track: Electroweak Physics
I will report on measurement of the WW production cross section and associated limits on anomalous couplings using LHC proton-proton collision data collected by the ATLAS Detector at 7 TeV center-of-mass energy. The production cross section was measured in the WW leptonic decay channels. Precise measurement of the triple-gauge-boson couplings is a stringent test of the Standard Model and ... More
Presented by Dr. Haijun YANG on 12 Aug 2011 at 10:30
Type: Parallel contribution Session: Electroweak Physics
Track: Electroweak Physics
We will report on a recent measurement of WZ production cross section and limits on anomalous WWZ couplings using LHC proton-proton collision data collected by the ATLAS Detector at 7 TeV center-of-mass energy in 2011. The measurement is carried out on the WZ leptonic decay channels yielding three isolated high-pT leptons and large transverse momentum imbalance in the events. The background events ... More
Presented by Mr. Yusheng WU on 12 Aug 2011 at 11:10
Session: Plenary Session
Presented by Prof. Mark SCHLISSEL on 13 Aug 2011 at 08:30
Session: Plenary Session
Presented by Angel TAVERAS on 13 Aug 2011 at 08:35
Session: Plenary Session
Presented by Prof. James VALLES on 9 Aug 2011 at 08:30
Session: Plenary Session
Presented by Prof. Clyde BRIANT on 9 Aug 2011 at 08:35
Type: Plenary contribution Session: Plenary Session
Track: Plenary
Presented by Bill FOSTER on 13 Aug 2011 at 09:45
Type: Parallel contribution Session: Electroweak Physics
Track: Electroweak Physics
We report on the first measurement of the angular distribution of final state lepton and also the forward and backward asymmetry (Afb) which is sensitive to Weinberg angle in $p\bar{p} \to \gamma^{*}/Z \to \ell^{+}\ell^{-} + X$ events produced at $\sqrt{s}=1.96 TeV$. The data sample collected by the CDF II detector. The angular distributions are studied as a function of the transverse momentum of ... More
Presented by Jiyeon HAN on 9 Aug 2011 at 16:00
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
The ATLAS detector, one of the two general purpose detectors at the LHC, has collected several hundred inverse picobarnes since the start of 2011 running. The large dataset has allowed deeper studies of bottom-quark tagging performance than before possible. Bottom-quark tagging is an important signal/background selection tool used in top analyses, SUSY analyses, Exotics analyses, and Standard Mode ... More
Presented by Gordon WATTS on 10 Aug 2011 at 14:40
Type: Parallel contribution Session: Heavy Flavor Physics
Track: Heavy Flavor Physics (bottom, charm, tau)
The identification of b-jets is an important ingredient in characterizing top quark events and many new physics scenarios. The b-tagging algorithms developed within the CMS experiment are mainly based on the large lifetime of b-hadrons. The discriminators and variables defined by the various algorithms which characterize b-jets (e.g. track impact parameter, vertex properties) have been studied usi ... More
Presented by Gavril GIURGIU on 10 Aug 2011 at 14:00
Type: Parallel contribution Session: Accelerator Physics
Track: Accelerator Physics
We pre­sent the de­sign of fu­ture high-en­er­gy high-lu­mi­nos­i­ty elec­tron-hadron col­lid­er at RHIC called eRHIC. We plan on adding 20 (po­ten­tial­ly 30) GeV en­er­gy re­cov­ery linacs to ac­cel­er­ate and to col­lide po­lar­ized and un­po­lar­ized elec­trons with hadrons in RHIC. The cen­ter-of-mass en­er­gy of eRHIC will range from 30 to 200 GeV. The lu­mi ... More
Presented by , Dr. Vladimir LITVINENKO on 10 Aug 2011 at 14:30