Lucia Masetti
(Institut fur Physik)
01/09/2010, 09:30
Lucia Silvestris
(Istituto Nazionale di Fisica Nucleare (INFN))
01/09/2010, 09:55
Nadia Pastrone
(INFN)
01/09/2010, 10:40
Dr
Brian Petersen
(CERN)
01/09/2010, 11:10
Erich Varnes
(University of Arizona)
01/09/2010, 11:40
Thomas Schwarz
(University of California Davis)
01/09/2010, 12:10
Prof.
Florencia Canelli
(University of Chicago and Fermilab)
01/09/2010, 14:00
Prof.
Youngjoon Kwon
(Yonsei University)
01/09/2010, 14:45
Steven Robertson
(High Energy Physics Group-McGill University-Unknown)
01/09/2010, 15:15
Mathew Graham
(SLAC)
01/09/2010, 15:45
Galina Pakhlova
(ITEP)
01/09/2010, 16:40
Werner Man-Li Sun
(Cornell University-Unknown-Unknown)
01/09/2010, 17:55
Zhengguo Zhao
(University of Science and Technology of China)
01/09/2010, 18:25
G. Fisk
(FNAL)
02/09/2010, 09:00
Thomas Kuhr
(Institut fuer Experimentelle Kernphysik)
02/09/2010, 09:30
Eleni Petrakou
(Nat. Cent. for Sci. Res. Demokritos (NRCPS))
02/09/2010, 10:00
The operation and general performance of the CMS electromagnetic calorimeter at sqrt{s} = 7 TeV are described. The first LHC beams have been used to finalize the commissioning of ECAL readout and trigger. The precision of the inter-channel synchronization and calibration has been verified and improved with collision data, exploiting decays of pi0s and eta into two photons, the phi invariance...
Ms
Regina Kwee
(CERN/Humboldt University of Berlin)
02/09/2010, 10:08
Since the restart of the LHC, ATLAS has successfully recorded data at sqrt{s} = 0.9 and 7 TeV. The ATLAS trigger strategy realised a step-wise activation of the three level trigger system, starting with hardware-based first-level (L1) triggers and moving with increasing luminosities to the deployment of the software-based high-level triggers (HLT). We will present L1 and HLT triggers and their...
Verena Ingrid Martinez Outschoorn
(Harvard University)
02/09/2010, 10:16
The first measurement of the production cross-sections for W and Z bosons in proton proton
interactions at sqrt(s) = 7 TeV are reported from the ATLAS experiment. Based
on its excellent capability for reconstructing both high pT electrons and muons, the
electron and the muon decay modes of the W/Z bosons are compared. First results for
the ratio of W/Z production and of W+/W- production...
Daniel Martschei
(Inst. fuer Experimentelle Kernphys.-Universitaet Karlsruhe-Unkno)
02/09/2010, 10:24
We describe a measurement of the inclusive b-jet production in pp collisions at sqrt(s) = 7 TeV. The analysis has been done on the first physics data collected by the CMS experiment at the Large Hadron Collider at CERN. To improve the low p_T measurement, the jets are reconstructed with the Particle Flow algorithm. The experimental uncertainties from jet energy corrections, jet energy...
Evgueni Goudzovski
(University of Birmingham)
02/09/2010, 11:20
Gaia Lanfranchi
(Istituto Nazionale di Fisica Nucleare (INFN))
02/09/2010, 12:05
Gilad Perez
(Weizmann Institute)
02/09/2010, 14:00
Katerina Lipka
(DESY Hamburg)
02/09/2010, 14:45
Ian Brock
(Physikalisches Institut)
02/09/2010, 16:35
Thomas Nunnemann
(LMU Munich)
02/09/2010, 17:20
Marcella Capua
(Dipartimento di Fisica-Univ. degli Studi della Calabria-Unknown)
02/09/2010, 18:05
Johannes Wessels
(Institut fuer Kernphysik-Westfaelische Wilhelms-Universitaet Mun)
02/09/2010, 18:35
Canceled
Satish Desai
(Fermilab)
03/09/2010, 09:15
Giacomo Contin
(Dipartimento di Fisica-Universita degli Studi di Trieste / INFN Sezione di Trieste)
03/09/2010, 10:00
The Silicon Strip Detector (SSD) is a fundamental part of the Inner Tracking System (ITS) for the ALICE experiment. Since the early phase of p-p collisions at LHC, the SSD is fully operational and participating in the charged particle detection and identification carried out by ALICE. The performance of the SSD during the 900 GeV and 7 TeV collision data taking is presented here.
The...
Mr
Kazuyuki Sakai
(Niigata University (Japan))
03/09/2010, 10:08
We present a result of search for CP-violating charge asymmetry in B^+ -> J/psi K^+ decays using 772x10^6 B anti-B meson pairs collected with the Belle detector at the KEKB asymmetric energy e^+ e^− collider.
The result supersedes our previous measurement and represents the most sensitive measurement up to date.
Ms
Oksu Seon
(Nagoya University)
03/09/2010, 10:16
In the Standard Model, lepton-number-violating decays such as $B^+ \to D^- \ell^+ \ell^+$ is strictly forbidden, but they are allowed if there exist Majorana-type neutrinos. In this poster, we report a first search for $B^+ \to D^- \ell^+ \ell^+$ ($\ell = e$ or $\mu$) decays with 772$\times 10^{-6}$ $B \bar{B}$ pairs produced by energy-asymmetric $e^+ e^-$ collision at KEKB accelerator and...
Daniel Zander
(Karlsruhe Institute of Technology)
03/09/2010, 10:24
The full reconstruction is an important tool for particle physics at the $B$ factories. By fully reconstructing one of the two $B$ mesons coming from the $\Upsilon (4S)$ resonance (tag side), the 4-momentum of the other $B$ meson (signal side) is immediately known and all remaining tracks in the detector can be associated with this other $B$ meson. The full reconstruction is therefore an...
Mr
Jürgen Winter
(TU München)
03/09/2010, 10:32
The 100t fiducial volume liquid-scintillator experiment Borexino, located at the Laboratori Nazionali del Gran Sasso, is far more than an observatory for solar neutrinos. Its extremely low energy threshold of about 50 keV due to its unprecedented radiopurity also enable to conduct other analyses, i.e. the search for geo-neutrinos, the investigation of the Pauli exclusion principle in Carbon-12...
Dr
Christopher Hays
(University of Oxford)
03/09/2010, 11:10
Tilman Plehn
(Heidelberg University)
03/09/2010, 14:00
Aksel Hallin
(University of Alberta)
03/09/2010, 14:45
Dr
Alexandre Sousa
(Harvard University)
03/09/2010, 15:30
Michael Wilking
(TRIUMF)
03/09/2010, 16:15
Riccardo Brugnera
(Universita' di Padova and INFN)
04/09/2010, 08:30
Carmelo Sgro'
(INFN-Pisa)
04/09/2010, 10:45
Thomas Gaisser
(University of Delaware)
04/09/2010, 11:30
Prof.
Francois Montanet
(LPSC IN2P3/CNRS Univ. Grenoble)
04/09/2010, 12:15
Mr
John Alison
(University of Pennsylvania)
Poster
Poster
ATLAS is a multipurpose experiment that records the products of the LHC proton‐proton
collisions. In order to reconstruct the trajectories of charged particles, ATLAS is equipped
with an inner tracking system built on silicon planar sensors (pixel and microstrips) plus
drift‐tube based detectors, all embedded in a 2 T solenoidal field.
In order to achieve its scientific goals, the...
Ruslan Asfandiyarov
(Wisconsin-Madison)
Poster
Poster
Higgs decay to WW leading to a final state of 2 leptons and missing energy constitutes one of the main Higgs search
channels at the LHC. A major background to the signal comes from W+jets events with a leptonic decay of the W and a
jet faking a lepton. We discuss methods to estimate such a background shape and...
Dr
Fedor Ratnikov
(KIT, Karlsruhe)
Poster
Poster
We present the first results of a search for long-lived gluinos which have stopped in the Compact Muon Solenoid detector after being produced in 7 TeV pp collisions from CERN's Large Hadron Collider. We looked for the subsequent decay of these particles during time intervals where there were no pp collisions in the Compact Muon Solenoid experiment. In particular, we searched for decays during...
13.
Jet production cross-section and jet properties in pp at sqrt(s) = 7 TeV with the ATLAS detector
francesc vives
Poster
Poster
Making use of the excellent calorimetry of the ATLAS experiment, measurements of the
cross-section for jet production and of jet properties in proton-proton interactions
at sqrt(s) = 7 TeV will be presented. The corrected and unfolded inclusive cross-section
for high-pT jets will be described, together with the cross-section as a function of the
invariant di-jet mass. Special emphasis...
Sarah Beranek
(I. Physikalisches Institut (B)-RWTH Aachen)
Poster
Poster
The first measurements of the J/psi and Upsilon production cross sections
in proton-proton collisions at 7 TeV, as measured by the CMS experiment
using the dimuon decay channel are presented. For the J/psi we give the
inclusive and the prompt differential cross sections versus transverse
momentum. For the Upsilon, we present the 1S cross section versus
transverse momentum and the...
Markus Röhrken
(Karlsruhe Institute of Technology)
Poster
Poster
We report a measurement of the branching fraction of $B^0 \rightarrow D^+ D^-$ decays. The result is based on a data sample that contains $535\times10^6$ $B\bar B$ pairs collected on the $\Upsilon(4S)$ resonance with the Belle detector at the asymmetric-energy KEKB $e^+ e^-$ collider. We obtain $(2.32\pm0.25\pm0.29)\times10^{-4}$ for the branching fraction of $B^0 \rightarrow D^+ D^-$...
Mr
Oliver Oberst
(KIT - Institut für Experimentelle Kernphysik)
Poster
Poster
The measurement of the inclusive jet cross section from pp collisions at a center-of-mass energy of s = 7 TeV using data collected by the CMS experiment with an integrated luminosity of about 60 nb−1 and in the pT range of 18-700 GeV is presented. Several different jet reconstruction methods are investigated using an anti-kT clustering algorithm. Studies of the systematic uncertainties in...
Alexander Golossanov
Poster
Poster
Yvonne Küssel
((III. Physikalisches Institut (B)-Rheinisch-Westfaelische Tech. Hochschule Aachen))
Poster
Poster
With a projected design luminostity of 10^{34} cm^{-2}s^{-1} the LHC will provide about 10^9 proton collisions per second within the CMS detector. Thus, an efficient trigger system to select interesting events is essential. A good knowledge of these trigger efficiencies is inevitable, e.g. for cross section measurements. This study presents data-driven approaches applied to first 7 TeV data to...
Mrs
Yvonne Küssel
(III. Physikalisches Institut (B)-Rheinisch-Westfaelische Tech. Hochschule Aachen)
Poster
Poster
We review the options for performing user analysis at CMS. The recent work emphasized the improvement of the Physics Analysis Toolkit (PAT), a high-level analysis layer enabling the development of common analysis efforts across and within Physics Analysis Groups. PAT aims at fulfilling the needs of most CMS analyses, providing both ease-of-use for the beginner and flexibility for the advanced...
83.
Photon reconstruction and identification with the CMS detector in pp collisions at sqrt(s)=7 TeV
Ms
Sudha Ahuja
(Cen. Detect. & Related Softw. Tech. (CDRST)-Department of Physic)
Poster
Poster
The performance of photon reconstruction and identification has been studied at sqrt(s) = 7 TeV. Reconstruction and identification variables as well as isolation have been compared between data and Monte Carlo for signal and background. Level 1 Trigger and High Level Trigger efficiencies have been measured.
Eva Barbara Ziebarth
(Inst. fuer Experimentelle Kernphys. - KIT)
Poster
Poster
The neutralino is the lightest supersymmetric particle in many SUSY models. Thus in R parity conserving models it provides a perfect dark matter candidate by being electromagnetically neutral, weakly interacting and stable. Following cosmological models, at the freeze-out time most neutralinos should have been transformed into standard model particles by annihilation. The annihilation cross...
Dr
Fedor Ratnikov
(KIT, Karlsruhe)
Poster
Poster
A signature-based search is performed for heavy stable charged particles (HSCPs) produced in pp collisions at sqrt(s) = 7 TeV, and collected with the CMS detector, using high transverse momentum muon, jet, and missing transverse energy trigger data. Momentum and ionization energy loss measurements are used to isolate candidate events with slowly moving, heavy particles. The presentation...
Paolo Rumerio
(University of Maryland)
Poster
Poster
The LHC has started accumulating data at a center-of-mass energy of 7 TeV. We look at the consistency of data samples containing high transverse momentum electrons and muons for their consistency with predicts for production of standard model particles. We look at the expectations for exotic new particles, such as leptoquarks, for this data.
Ms
Pooja Saxena
(Delhi University)
Poster
Poster
Silicon Detector (SiD) is one of the proposed detector for future e+-e- Linear colliders, like International Linear Collider (ILC). The estimated neutron background for ILC is around 1 - 1.6 x 10^10 1-MeV equivalent neutrons cm-2 year-1 for the Si micro strip sensors to be used in the innermost vertex detector. The p+n-n+ double-sided Si strip sensors are supposed to be used as position...
Dr
Gurjav Ganbold
(JINR, Dubna)
Poster
Poster
The behavior of QCD effective coupling is studied in the low-energy region
within a relativistic quantum-field model based on analytical confinement.
The spectra of two-quark and two-gluon bound states are defined by using
the Bethe-Salpeter equation and compared with conventional meson masses.
A new, independent and specific infrared-finite behavior of QCD coupling
is revealed...
Michael Heinrich
(Inst. fuer Experimentelle Kernphys. - Universitaet Karlsruhe)
Poster
Poster
The first measurement of the charged component of the Underlying Event using the recently proposed jet area/median approach is presented for proton-proton collisions. The sensitivity to different generator tunes is demonstrated for charged particle jets after applying detector specific selection criteria and thresholds. The subsequent comparison of uncorrected CMS data with predictions of...
Anna Kaczmarska for the ATLAS SC
(IFJ PAN, Krakow, Poland)
Poster
Poster
Top-quark pairs are expected to be produced copiously at the LHC, even at the
lower beam energy and luminosity expected in the first years of running.
Establishing the top-pair signal and measuring the production cross-section are
important benchmarks for ATLAS, and will help understand the detector
performance for events with high-pT leptons, high jet multiplicity, missing
transverse...
