# PLHC2011 - Physics at LHC 2011

5-11 June 2011
Perugia Congress Center GIO
Europe/Zurich timezone
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Displaying 115 contributions out of 115
First results from ATLAS on Higgs searches in the 2011 data are reported. Overview of the results will be given for several decays modes of the SM Higgs boson.
Presented by Yingchun ZHU on 10 Jun 2011 at 14:30
Particle multiplicities and correlations are an important feature of physics at the LHC. They provide an insight into the environment in which all ATLAS physics measurements are performed. Measurements of charge and neutral particle multiplicities and of two-particle correlations with the ATLAS detector, made as a variety of centre-of-mass energies, are presented. These measurements are used t ... More
Presented by James William MONK on 7 Jun 2011 at 17:35
Precise measurements of the top quark decay properties at hadron colliders offer interesting new possibilities of testing the standard model. At the same time, recent intriguing experimental results concerning CP violation in the Bd and Bs systems have stimulated many studies of physics beyond the standard model. We investigate anomalous tWdj interactions as a possible source of new effects in Bds ... More
Presented by Jure DROBNAK on 9 Jun 2011 at 17:20
Session: 4A - B and top
The LHCb experiment has accumulated a sample of ~37 pb-1 of data during the 2010 run of LHC, at a center of mass energy of 7 TeV, and has already collected more than 150 pb-1 in the 2011 run. Results will be presented for heavy flavour production and decays in several modes. First measurements of the Bs mixing frequency and CPV phase, direct CP asymmetries and searches for new Physics in rare B d ... More
Presented by Marta CALVI on 9 Jun 2011 at 10:00
Session: 4A - B and top
Presented by Paola SQUILLACIOTI on 9 Jun 2011 at 09:30
The Large Hadron Collider (LHC) provided the first p+p collisions in the period of November-December 2009. Since then, a large data sample has been recorded by all LHC experiments. This event sample allows us to study more and more exotic particles and events. The ALICE (A Large Ion Collider Experiment) experiment, though designed primarily to study heavy ion collisions, has a rich proton-p ... More
Presented by Michal BROZ on 7 Jun 2011 at 15:15
Presented by Sergio BERTOLUCCI on 6 Jun 2011 at 10:35
Using data collected by the LHCb detector during the 2010 run of the LHC we reconstruct the main charmless charged two-body b-hadron decay modes, namely B0--> pi+pi–, B0 --> K+pi–, Bs0 --> K+K–, Bs0 --> pi+K–, Lamdab --> pK– and Lamdab --> ppi–, and obtain first preliminary measurements of direct CP asymmetries. We also present studies of decays of the type B --> DX, where D is a charm ... More
Presented by Lars EKLUND on 9 Jun 2011 at 16:15
LHCb has reconstructed large samples of open charm events using 37 pb–1 of LHCb data collected in 2010. CP violation in charm is an excellent probe for New Physics due to the smallness of the Standard Model predictions. The analyses of D0 decays into two-body final states are presented, including time-dependent measurements of CP violation and mixing via the parameters AΓ and yCP and the measur ... More
Presented by Vladimir GLIGOROV on 9 Jun 2011 at 17:40
Presented by Neal WEINER on 11 Jun 2011 at 09:20
A measurement of the inelastic cross section for proton-proton collisions at 7 TeV centre-of-mass energy is present. In addition the separate contributions of single- and double-diffractive dissociation are measured, and the differential cross section as a function of rapidity gap is presented.
Presented by Oldrich KEPKA on 7 Jun 2011 at 18:20
Session: 2E Parallel- EWK
The production of pairs of bosons is an important process for investigating the electroweak sector of the Standard Model. We present measurements of the diphoton, Z+photon, W+photon and WW production cross sections. Constraints on the couplings are also presented.
Presented by Johannes EBKE on 7 Jun 2011 at 14:30
We present the results of electroweak studies performed using data collected in 2010 at a center-of-mass energy of 7 TeV by the CMS experiment at the LHC. Besides their intrinsic interest as unique samples to calibrate and understand the CMS detector response to leptons, jets and missing energy, events containing W and Z bosons appear as dominant components in many Higgs seaches and in most of the ... More
Presented by Luca LISTA on 8 Jun 2011 at 10:00
Presented by Junjie ZHU on 8 Jun 2011 at 09:30
New data on neutron emission in electromagnetic dissociation Pb ions at LHC will be presented. The measurement was performed by means of the Zero Degree Calorimeters (ZDC) of the ALICE experiment, which consists of two identical sets of detectors located at opposite sides with respect to the beam intersection point, ~114 m away from it. Each set of detectors include a neutron (ZN) and a proton (Z ... More
Presented by Nora DE MARCO on 7 Jun 2011 at 18:20
We report on studies of exclusive dimuon production, using LHCb experimental data. Muon pairs can be exclusively produced by two-photon fusion (a QED process ideally suited to obtaining a precise integrated luminosity measure), or by resonance production. We show results for exclusive dimuon production, and first observations of the exclusive J/Psi, Psi(2S) and Chi_c states, obtained with 37 pb– ... More
Presented by Valentin NIESS on 7 Jun 2011 at 19:00
A measurement of exclusive production of muons pairs in pp collisions at \sqrt{s} = 7 TeV is presented. Events are selected requiring the observation of two muons and no other activity in the CMS detector. Single differential cross sections are obtained as function of the dimuon transverse momentum, invariant mass and acoplanarity for dimuon pairs with an invariant mass above 11 GeV. Data are comp ... More
Presented by Krzysztof PIOTRZKOWSKI on 7 Jun 2011 at 18:40
Presented by Jim VIRDEE on 11 Jun 2011 at 11:00
Presented by Tejinder VIRDEE
Third family (t-b-tau) Yukawa unification is predicted in a class of grand unified models based on SO(10) as well as its subgroup H = SU(4) x SU(2) x S (2). This can lead to some surprising conclusions for the low energy MSSM phenomenology. For instance, in SO(10) the gluino turns out to be the lightest colored sparticle, while the gauge symmetry H can yield a gluino NLSP scenario. A search for NL ... More
Presented by Qaisar SHAFI on 10 Jun 2011 at 17:10
Presented by T.B.A
Presented by Guenakh MITSELMAKHER on 11 Jun 2011 at 12:40
Presented by Tatsuya NAKADA on 11 Jun 2011 at 09:55
Session: 4A - B and top
Presented by Gilad PEREZ on 9 Jun 2011 at 09:00
Totally inclusive quantities such as the total and inelastic pp cross-sections at the LHC along with proposals for the measurements and estimates of pion proton and pion pion cross-sections will be discussed.
Presented by Yogendra SRIVASTAVA on 7 Jun 2011 at 17:55
CMS is pursuing a rich program of hard QCD physics. Jet and photon cross section measurements are reported on inclusive and di-object production, as well as ratios of 3/2 jet and photon+jet cross sections. The QCD multi-jet dynamics is studied with event-shape variables, dijet azimuthal decorrelation and dijet angular distributions. Inclusive forward jet production and associated production of for ... More
Presented by Konstantinos KOUSOURIS on 8 Jun 2011 at 11:50
Presented by Giulia ZANDERIGHI on 8 Jun 2011 at 11:20
In November 2010, the LHC experiments, ALICE, ATLAS and CMS, took first Pb-Pb data at the unprecedented centre of mass energy per nucleon pair of 2.76 TeV. This talk gives an overview of the first physics results obtained with these data.
Presented by Andreas MORSCH on 7 Jun 2011 at 12:25
Presented by Gary WESTFALL on 7 Jun 2011 at 11:50
Presented by Dmitri KHARZEEV on 7 Jun 2011 at 11:15
We present early results of the CMS experiment from PbPb collisions at $srqrt{s_{NN}}$ = 2.76 TeV, probing quark and gluon matter at unprecedented values of energy density. The capabilities of the CMS apparatus allows us to investigate various hard probes, as well as bulk particle production and collective phenomena, using the calorimetry, muon and tracking systems covering a large range in pseudo ... More
Presented by Raphael GRANIER DE CASSAGNAC on 7 Jun 2011 at 14:30
We report on the various SM and BSM Higgs Boson searches conducted by the CMS experiment with the 2010 data. Projected CMS sensitivity to SM Higgs Boson searches at sqrt(s) = 7 TeV under various luminosity scenarios will also be described.
Presented by Ashok KUMAR on 10 Jun 2011 at 14:50
Detection of a signal in one of the standard LHC Higgs search modes does not guarantee that the particle discovered is the Standard Model Higgs. I'll survey some general classes of alternatives and ways to tell them apart.
Presented by Heather LOGAN on 10 Jun 2011 at 15:10
We report on the various SM and BSM Higgs Boson searches conducted by the CMS experiment with the 2010 data. Projected CMS sensitivity to SM Higgs Boson searches at sqrt(s) = 7 TeV under various luminosity scenarios will also be described.
Presented by Marcello MANNELLI on 10 Jun 2011 at 10:00
Presented by Massimo CASARSA on 10 Jun 2011 at 09:35
Presented by Radja BOUGHEZAL on 7 Jun 2011 at 17:55
Presented by Roberto CONTINO on 10 Jun 2011 at 09:00
In heavy ion collisions at the LHC, the ALICE experiment is studying nuclear matter at very high energy density where the formation of a Quark Gluon Plasma (QGP) is expected. J/ψ production is an important probe to characterize the properties of the QGP as it gives access to the early stages of the collision. However a fundamental understanding of the J/ψ production mechanism in p-p collisions i ... More
Presented by Cynthia HADJIDAKIS on 9 Jun 2011 at 18:00
The suppression of high-pT hadron production in central heavy-ion events compared to proton-proton collisions, known as jet quenching, reflects the parton energy loss in a hot and dense medium which is produced in heavy-ion collisions. The reconstruction of jets provides a more direct link to the initial hard-scattered partons and its modified fragmentation process. The measurements in proton-pr ... More
Presented by Bastian BATHEN on 7 Jun 2011 at 17:15
We present detailed measurements of W or Z plus jet production, including multiplicities, jet transverse momentum and other differential cross sections. The cross sections for W+b-jets and Z+b-jets are also presented. The measurements are compared to NLO QCD predictions.
Presented by Maria FIASCARIS on 9 Jun 2011 at 14:30
Jet production is the hard QCD process with the widest kinematic reach and largest cross section at the LHC. Jets at large rapidity intervals, and jets which are not back-to-back, can also probe novel QCD evolution and radiation patterns. Comprehensive measurements of inclusive and dijet production are presented, as well as the production cross sections for jets containing beauty and charmed ha ... More
Presented by Felix MUELLER on 9 Jun 2011 at 15:50
We present the measurements of b-quark production in inclusive channels and exclusive decays. 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. In addition, measurements of B+, B0 and Bs meson production cross sections are presented. Finally, a study of the angular ... More
Presented by Polina OTIOUGOVA on 9 Jun 2011 at 17:00
We present production cross-section measurements of diboson final states, WW, Wγ and Zγ, based on 36 inverse-picobarns of proton proton collisions data at √s = 7 TeV recorded at the LHC by the CMS detector. The electron and muon decay channels of the W and Z are used. For the W mode, we consider ee, e-mu and mu-mu final states. For the Wγ and Zγ modes, we measure the cross sections for the p ... More
Presented by Armando LANARO on 9 Jun 2011 at 16:10
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, as well as measurements of the inclusive forward jet cross section and of associated production of forward and central jets. Results are compared to MC models with different parameter tunes for the description of the underly ... More
Presented by Alexander FLOSSDORF on 7 Jun 2011 at 17:35
The main goal of the ALICE experiment is the investigation of the properties of strongly-interacting matter in a very high density decon ned state, that should be formed in Pb-Pb collisions. The measurement of the heavy avour production cross section in p-p collisions at the LHC will allow to test perturbative QCD calculations in a new energy regime. The p-p collisions data are also important as ... More
Presented by Davide CAFFARRI on 9 Jun 2011 at 18:40
This talk presents the J/psi and psi(2S) differential cross sections and J/psi spin alignment in pp collisions at 7 TeV, as a function of transverse momentum and in several rapidity ranges, on the basis of the 2010 data collected by CMS. The B to J/psi and B to psi(2S) fractions will also be presented, and compared to other measurements as well as to theory calculations. We also report the measure ... More
Presented by Hermine K. WOEHRI on 9 Jun 2011 at 15:55
The determination of the CP-violating phase Φs in Bs0 -> J/ Ψ Φ decays 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. To perform the first LHCb analysis of Φs on 2010 data at a centre-of-mass energy of 7 TeV, many milestones needed to be achieved first, such as the me ... More
Presented by Greig COWAN on 9 Jun 2011 at 15:35
Studies of the internal structure of jets, and of events with high jet multiplicities, provide a stringent test of QCD. These important standard model process may also hide, or reveal, new physics. We present measurements of multijet cross sections and distributions, of the subjet structure in high-pT jets, and of the distribution of charged particle inside jets.
Presented by Bilge DEMIRKOZ on 7 Jun 2011 at 17:15
This talk presents the latest searches for signals of Supersymmetry in the data collected in 2010 by the ATLAS experiment in LHC collisions at a centre-of-mass energy of 7 TeV. The first study looks for a signal in the di-photon plus large missing energy final state while the second is a search, based on the muon spectrometer, for long-lived stable massive particles No excess was observed and li ... More
Presented by Simon OWEN on 10 Jun 2011 at 18:10
The LHC opens new frontiers in heavy flavour physics through an unprecedented statistical reach for a variety of interesting states produced in pp collisions. The four experiments have excellent complementary acceptances and good mass resolutions to provide a complete picture of quarkonium production. We will analyse the recent quarkonium results of the four LHC experiments, comparing them with t ... More
Presented by Giulia MANCA on 7 Jun 2011 at 10:20
The production cross sections of the D*+-, D+- and Ds+- charm mesons have been measured with the ATLAS detector in pp collisions at sqrt{s}=7 TeV. The differential cross sections as a function of transverse momentum and pseudorapidity as well as the total cross sections are measured for D*+- and D+- production. Further production measurements of B and D hadrons will be presented.
Presented by Miriam WATSON on 9 Jun 2011 at 18:20
on 7 Jun 2011 at 16:15
ATLAS searches for supersymmetry in data from the 2010 run of the LHC, corresponding to an integrated luminosity of 35 pb-1, will be reviewed. These searches were performed in various channels containing different lepton and jet multiplicities in the final state (with and without missing transverse momentum). Searches for semi-stable particles will also be covered.
Presented by Troels PETERSEN on 10 Jun 2011 at 15:35
Presented by Stefano FORTE on 7 Jun 2011 at 09:30
Presented by Michel LEFEBVRE on 11 Jun 2011 at 12:30
Presented by Frank PETRIELLO on 8 Jun 2011 at 09:00
We present QCD measurements with photons using data from pp collisions at sqrt(s)= 7 TeV, recorded with the CMS detector at the CERN LHC. The differential cross section for the inclusive production of isolated prompt photons as a function of the photon transverse energy and the inclusive di-photon production rate as a function of the di-photon invariant mass are compared to next-to-leading-order p ... More
Presented by Philippe GRAS on 9 Jun 2011 at 15:30
The production of quarkonium is an important testing ground for QCD calculations. The fraction of J/\psi mesons produced from B-hadron decays was measured by the ATLAS experiment and the prompt and non-prompt differential J/\psi production cross-sections determined. The cross-section values extracted from data are compared to predictions from next-to-leading order QCD calculations. Results for he ... More
Presented by Kendall REEVES on 9 Jun 2011 at 14:50
The talk will summarize recent results in W/Z production for the full 2010 data sample. These results include the inclusive W/Z cross-sections, the W asymmetry, the PT(Z) distribution, and studies of W+jets and Z+jets production. Many comparisons with state of the art calculations are included. First results on di-boson production will also be presented, including WW, WZ, and W/Z+gamma results, w ... More
Presented by Matthias SCHOTT on 8 Jun 2011 at 10:25
The LHC provides a new regime to probe perturbative QCD and for which MC generators need to be tested to pave the way for BSM searches. The results of several studies performed in ATLAS using the full 2010 data sample are presented: inclusive jets and dijets cross sections,azimuthal decorrelations, multijets, dijets with jet veto, jet sub-structure, b-jet and prompt-photon production. In addition, ... More
Presented by Mathieu PLAMONDON on 8 Jun 2011 at 12:20
In the context of the Standard Model and of scenarios beyond the Standard Model, results of Higgs boson searches of the ATLAS experiment are presented for 2010 and 2011 data. Combination of the Standard Model Higgs decay channels is shown for the 2010 data.
Presented by Marc ESCALIER on 10 Jun 2011 at 10:25
The Large Hadron Collider provides an exceptional opportunity to test the validity of the Standard Model at the TeV scale where new phenomena are considered likely to be found. We present a review of new physics searches including searches for supersymmetry in pp collisions at 7 TeV using the ATLAS detector. Particular emphasis will be given to most recent results, including those obtained with 20 ... More
Presented by Tommaso LARI on 10 Jun 2011 at 12:25
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. With the factor of 14 increase in collision energy compared to RHIC data, significant insight has already been gained using dijet asymmetry measurements, but a more detailed study of both high pT probes and global features of th ... More
Presented by Tomasz BOLD on 7 Jun 2011 at 15:35
Hadron inclusive spectra in pp collisions are analyzed within the soft QCD (SQCD), the quark-gluon string model, and the perturbative QCD (PQCD). It is shown that the SQCD results in the satisfactory description of the experimental data on the inclusive spectra of light hadrons like pions and kaons at transverse momenta Pt not larger than 1-2 GeV/c. We discuss some difficulties to apply the SQCD m ... More
Presented by Gennady LYKASOV on 9 Jun 2011 at 15:10
We study the possibility of observing at the LHC Higgs bosons produced from supersymmetric decay chains in the regions of parameter space consistent with a neutralino dark matter relic density. We analyze the dependence on the non- standard Higgs boson, slepton and squark masses, as well as on the condition of gaugino mass unification. In general, we conclude that, provided sleptons are heavier th ... More
Presented by Stefania GORI on 10 Jun 2011 at 17:30
We present the results of a search for large extra spatial dimensions with the pp collisions at 7 TeV collected with CMS in 2010. No excess of events above the standard model predictions has been found. Limits are set on the effective Planck scale.
Presented by Ka Vang TSANG on 10 Jun 2011 at 17:30
Rare decays of the B and Bs mesons are sensitive indirect probes of New Physics. In particular, the search for B(s) --> μ+μ– decays provides information on the presence of new (pseudo-)scalar particles, while the angular analysis of decays like B --> K*μ+μ– provides information on possible new vector-axial contributions. Furthermore radiative decays like Bs --> Φγ provide valuable info ... More
Presented by Johannes ALBRECHT on 9 Jun 2011 at 14:30
A search for new physics is presented based on an event signature of at least three jets accompanied by large missing transverse momentum using a data sample of 36 pb^-1 of proton–proton collisions at sqrt(s) = 7 TeV acquired by the CMS detector at the LHC in 2010. There are three main background components. One is irreducible, from Z+jets events, with the Z decaying to neutrinos. A second comes ... More
Presented by Piet VERWILLIGEN on 10 Jun 2011 at 16:50
We present results of searches for Supersymmetry in signatures involving one or more leptons. These searches are performed with 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 background are demonstrated. The results are interpreted within the CMSSM as well as more general, simpl ... More
Presented by Didar DOBUR on 10 Jun 2011 at 17:50
The most sensitive channels to Supersymmetry in proton-proton collisions are composed of jets and missing transverse momentum finalstates. The most recent results on these channels will be given based on data recordedin 2011.
Presented by Michael RAMMENSEE on 10 Jun 2011 at 16:30
We present the results of searches for new heavy resonances in dijet, ttbar, and multijet hadronic final states in the pp collisions at 7 TeV delivered by LHC and collected with the CMS detector in 2010. No excess of events above the standard model predictions has been found.
Presented by Sertac OZTURK on 10 Jun 2011 at 14:50
We present the results of searches for excited leptons and new heavy gauge bosons in leptonic final states in the pp collisions at 7 TeV delivered by LHC and collected with the CMS detector in 2010. No excess of events above the standard model predictions has been found.
Presented by Carmen DIEZ PARDOS on 10 Jun 2011 at 16:50
We present the results of searches for pair-production of leptoquarks and bottom-like fourth generation quark b′ in pp collisions at 7 TeV collected with CMS in 2010. No excess of events above the standard model predictions has been found. Limits are set on the production cross section, some of which are the most stringent to date.
Presented by Anne-Fleur BARFUSS on 10 Jun 2011 at 18:10
We present the result of searches for single top-quark production in the t- and Wt-channels in 7 TeV proton-proton collisions with the ATLAS detector using the full 2010 data sample. The t-channel search is based on the selection of events with a single lepton (muon or electron), jets and missing transverse energy. A likelihood function approach is also used to cross-check the result. Results are ... More
Presented by Reinhard SCHWIENHORST on 9 Jun 2011 at 18:00
Many extensions of the Standard Model predict the existence of additional, heavy gauge bosons. The ATLAS detector is used to search for high-mass states, such as charged and neutral heavy gauge bosons, (W',Z’) decaying to a charged lepton (electron or muon) and a neutrino or into two leptons, respectively in the 2011 data.
Presented by Dominick John OLIVITO on 10 Jun 2011 at 16:30
First results from the ATLAS searches for new particles decaying into dijet final states in the 2011 data are reported. An overview of the results will be given.
Presented by Ryan Mark BUCKINGHAM on 10 Jun 2011 at 14:30
Many models beyond the standard model predict that new particles decaying into final states with top quarks. The ATLAS search results for top quark pair resonances in the 2011 data are reported.
Presented by Diane CINCA on 10 Jun 2011 at 17:50
We discuss the results of searches for various new physics phenomena, including supersymmetry, in pp collisions at 7 TeV delivered by the LHC and collected with the CMS detector. These results demonstrate a good understanding of the detector and backgrounds in a variety of channels and in many cases they set the most stringent limits on these new physics phenomena, surpassing previous experiments.
Presented by Lars SONNENSCHEIN on 10 Jun 2011 at 11:55
We discuss the characteristic signals of supersymmetric models in low energy observables that are sensitive to flavour and CP violation. We focus in particular on two of the golden channels at LHCb: the rare Bs - μ+μ− decay and CP violation in Bs mixing. We show the distinct predictions for the above flavour observables within several supersymmetric frameworks, including the MSSM with Minimal ... More
Presented by Wolfgang ALTMANNSHOFER on 9 Jun 2011 at 15:10
We present measurements of single top quark production, performed using CMS data collected in 2010-2011 at a centre-of-mass energy of 7 TeV. The cross section for the electroweak production of single top quarks is measured in the t-channel using various methods. The combined result is used to place a constraint on the CKM matrix element Vtb. The data sample analyzed allows to study also differenti ... More
Presented by Mara SENGHI SOARES on 9 Jun 2011 at 18:20
The ALICE experiment at the LHC has studied p-p collisions at several center-of-mass energies (namely, sqrt(s)= 0.9, 2.36, 2.76 and 7 TeV). Although the main focus of the experiment is on the study of nuclear collisions, many aspects of p-p physics can be addressed by ALICE. In particular, soft observables (charged hadron multiplicity, identified particle spectra and ratios, Bose-Einstein corre ... More
Presented by Luciano RAMELLO on 7 Jun 2011 at 09:55
Presented by Francesco HAUTMANN on 7 Jun 2011 at 09:00
Presented by Gianluigi ARDUINI on 6 Jun 2011 at 11:10
Presented by Johannes WESSELS on 6 Jun 2011 at 15:20
Presented by Ludovico PONTECORVO on 6 Jun 2011 at 11:45
Presented by Guido TONELLI on 6 Jun 2011 at 12:20
Session: 2E Parallel- EWK
A short review of the status of theoretical calculations and their uncertainties for the most relevant electroweak processes at the LHC is presented
Presented by Fulvio PICCININI on 7 Jun 2011 at 14:50
Presented by Andreas SCHOPPER on 6 Jun 2011 at 15:55
Presented by Oscar ADRIANI on 6 Jun 2011 at 14:55
Presented by Nicola TURINI on 6 Jun 2011 at 14:30
Session: 2E Parallel- EWK
We report on measurements of W+, W– and Z0 production, using data taken by the LHCb experiment at sqrt(s) = 7 TeV during 2010. The electroweak bosons are reconstructed by selecting decays to muonic final states. The cross-sections are measured within the region 2 < eta < 4.5, using muons of transverse momenta exceeding 20 GeV/c, as well as differentially as a function of lepton pseudorapidity (f ... More
Presented by Stephen FARRY on 7 Jun 2011 at 15:55
Session: 2E Parallel- EWK
We present various measurements with W and Z bosons, based on 36 inverse-picobarns of pp collisions at √s = 7 TeV recorded by the CMS detector at the LHC in 2010. The results, obtained in the electron and muon channels, are compared to predictions at the NLO or NNLO in QCD using recent sets of parton densities. We first report on the inclusive W- and Z-boson production cross sections, measured i ... More
Presented by Hwidong YOO on 7 Jun 2011 at 15:35
Presented by Aran GARCIA-BELLIDO on 11 Jun 2011 at 09:00
Presented by Gerard SAJOT on 10 Jun 2011 at 15:35
Presented by Carlos E.M. WAGNER on 10 Jun 2011 at 11:20
Since a decade, there have been extensive developments about an alternative to super- symmetry: the scenarios with warped extra dimensions. Those constitute a new paradigm in the sense that they are dual, through the AdS/CFT correspondence, to composite Higgs models. These scenarios predict strong deviations from the Standard Model mainly in the bottom and top quark sector. In that sense, the LEP ... More
Presented by Gregory MOREAU on 9 Jun 2011 at 17:40
The long-standing Tevatron anomaly in the top forward-backward asymmetry has been the focus of a recent wave of model building. I will discuss models which account for the asymmetry and the prospects for related measurements at the LHC in both the short- and long-term. Two strategies for measuring related asymmetries at the LHC will be detailed, with large beyond-the-standard-model asymmetries ob ... More
Presented by Jessie SHELTON on 10 Jun 2011 at 17:10
Presented by Riccardo BARBIERI on 11 Jun 2011 at 11:45
The extended kinematical reach in the collisions of heavy ions at the LHC opens several possibilities: new phenomena might emerge, while "known" observables are cast under a new light. I shall present a few examples of such effects, as well as tentative conclusions that could be drawn from the 2010 Pb+Pb run.
Presented by Nicolas BORGHINI on 7 Jun 2011 at 14:50
Session: 4B - B and top
Presented by Eric LAENEN on 9 Jun 2011 at 11:15
We present precise measurements of the top quark pair production cross section at 7 TeV, performed using CMS data collected in 2010-2011. The total cross section is measured in the lepton+jets, dilepton and fully hadronic channels, including the tau-dilepton and tau+jets modes. The results are combined and confronted with precise theory calculations. We also obtain an indirect constraint on the to ... More
Presented by Haryo SUMOWIDAGDO on 9 Jun 2011 at 17:20
We present measurements of the top quark mass and other properties, obtained from CMS data collected in 2010-2011 at a centre-of-mass energy of 7 TeV. The mass of the top quark is measured using several methods. We use the lepton+jets, as well as the dilepton and the fully hadronic decay channels. The results are combined. Top pair production cross section measurements are used to place an indirec ... More
Presented by Thomas SPEER on 9 Jun 2011 at 19:00
We present a measurement of the top-quark pair-production in proton-proton collisions at = 7 TeV with the ATLAS detector at the Large Hadron Collider using the full 2010 data sample. The cross sections are measured in the lepton+jets and dilepton channels both with and without the use of b-tagging
Presented by Adam ROE on 9 Jun 2011 at 17:00
We present result on the direct measurement of the top quark mass in the lepton+jets channel, and an ndirect measurement of the top quark mass from the top quark pair production cross section. We also present a measurement of the W boson polarisation in top quark decays and set limits on anomalous contributions to the Wtb vertex. All data were collected from proton-proton collisions at sqrt(s)=7 T ... More
Presented by Valerio DAO on 9 Jun 2011 at 18:40
Session: 4B - B and top
We present the most recent results on top quark physics using data collected with the ATLAS experiment. Results include the top pair production cross section in several channels, the search for single top production and searches for anomalous top quark production, and various measurements of top-quark properties such as the top quark mass and W polarization from top decay.
Presented by Marina COBAL on 9 Jun 2011 at 12:15
Session: 4B - B and top
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 year 2010 at 7 TeV center-of-mass energy, and amounting to a total integrated luminosity of 36 pb-1. Results include the top pair production cross section, measured in both the dilepton and lepton+jets channels, the top quark mass, single top pro ... More
Presented by Alicia CALDERON TAZON on 9 Jun 2011 at 12:40
Session: 4B - B and top
Presented by Aran GARCIA-BELLIDO on 9 Jun 2011 at 11:45
A study of the linearized sphericilty in minimum bias proton-proton collisions at sqrt(s) = 0.9 and 7 TeV with the ALlCE detector at the LHC is presented. The observable was measured in the plane perpendicular to the beam direction and using primary charged tracks in |eta|<=0.8. The average sphericity as a function of multiplicity is reported for events with different hardness ("soft" and hard") ... More
Presented by Antonio ORTIZ VELASQUEZ on 7 Jun 2011 at 19:00
A measurement of the underlying activity in scattering processes with a pT scale in the several GeV region is performed in proton-proton collisions at sqrt(s) = 7 TeV, using data collected by the CMS experiment at the LHC. The production of charged particles with pseudorapidity eta < 2 and pT > 0.5 GeV/c is studied in the azimuthal region transverse to that of the leading set of charged particles ... More
Presented by Paolo BARTALINI on 7 Jun 2011 at 18:40
Session: 2E Parallel- EWK
Electroweak bosons are a "standard candle" process for physics at the LHC. We present measurements of total inclusive W and Z production cross sections, as well as differential cross sections and the W charge asymmetry.
Presented by Lashkar KASHIF on 7 Jun 2011 at 15:15
We present a study of jet production in association with W and Z bosons in pp collisions at a centre-of-mass energy of 7 TeV using 36 inverse-picobarns of data collected in the CMS experiment. The production of vector bosons with jets provides a stringent and important test of perturbative QCD calculations, and is an important background in searches for new physics and for studies of the top quark ... More
Presented by William Robert REECE on 9 Jun 2011 at 14:50
Presented by Giancarlo MANTOVANI on 6 Jun 2011 at 10:30
I will summarize several of the signals that appear in NON supersymmetric models beyond the SM, like Z', extra-dimensions, little or composite Higgs and models without a Higgs.
Presented by Antonio DELGADO on 10 Jun 2011 at 15:10