Studies of jet quenching in PbPb collisions at s NN  = 2.76 TeV (Englisch)

in AIP Conference Proceedings ; 1422 , 1 ; 203-208
AIP Conference Proceedings

Jets are an important tool to probe the hot, dense medium which is produced in ultrarelativistic 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 high quality calorimeters and high precision silicon tracker. Jet quenching has been studied in CMS in PbPb collisions at s NN  = 2.76 TeV. As a function of centrality, dijet events with a high pTleading jet were found to have an increasing momentum imbalance that was significantly larger than those predicted by simulations. The angular distribution of jet fragmentation products has been explored by associating charged tracks with the dijets observed in the calorimeters. The calorimeter-based momentum imbalance is reflected in the associated track distributions, which show a softening and widening of the subleading jet fragmentation pattern. Studies of the missing transverse momentum projected on the jet axis have shown that the overall momentum balance can be recovered if tracks at low pTare included. In the PbPb data, but not in the simulations, a large fraction of the balancing momentum is carried by soft particles radiated at large angle relative to the jets. New studies of leading and subleading jet fragmentations functions will be shown.

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1
Preface: EPIC@LHC
Elia, Domenico | 2012
5
Recent results from RHIC - First steps towards quantitative QGP measurements
Caines, Helen | 2012
15
EPIC results from ALICE
Harris, John W. / ALICE Collaboration | 2012
25
ATLAS results from the first Pb-Pb collisions
White, Sebastian N. / ATLAS Collaboration | 2012
34
Modeling global event properties using hydrodynamics from RHIC to LHC
Bożek, Piotr | 2012
44
Measurement of direct photon v2 in S NN  = 200 GeV Au + Au collisions
Greene, Senta V. / PHENIX Collaboration | 2012
50
Measurement of anisotropic flow coefficients in Pb-Pb collisions at S NN  = 2.76 TeV by the CMS experiment
Issah, Michael / CMS Collaboration | 2012
56
Elliptic flow and shear viscosity within a transport approach from RHIC to LHC energy
Plumari, S. / Greco, V. | 2012
62
Phase diagram of QCD from the lattice
D'Elia, Massimo | 2012
68
Two-pion Bose-Einstein correlations in Pb-Pb collisions at S NN  = 2.76 TeV measured with the ALICE experiment
Gramling, Johanna Lena / ALICE Collaboration | 2012
74
Predictions of hadron multiplicities in pp collisions at the LHC
Becattini, F. | 2012
79
Charged-particle multiplicity density at mid-rapidity in Pb-Pb collisions at S NN  = 2.76 TeV with ALICE at the LHC
Nicassio, Maria / ALICE Collaboration | 2012
85
Strange and identified hadron production at the LHC with ALICE
Barnby, L. S. / ALICE Collaboration | 2012
92
Results on resonance production at LHC energies from the ALICE experiment
Badalá, A. / ALICE Collaboration | 2012
98
The SPS ion program and the first LHC data
Gazdzicki, Marek | 2012
104
PHENIX results from the RHIC beam energy scan program
Mitchell, J. T. / PHENIX Collaboration | 2012
110
Measurement of reference cross sections in pp and Pb-Pb collisions at the LHC in van der Meer scans with the ALICE detector
Gagliardi, M. / ALICE Collaboration | 2012
117
Heavy quark dynamics in the QGP
Greco, V. / van Hees, H. / Rapp, R. | 2012
127
D meson analysis in Pb-Pb collisions at S NN  = 2.76 TeV at the LHC with ALICE
Ortona, Giacomo / ALICE Collaboration | 2012
135
Measurement of the nuclear modification factor of electrons from heavy-flavour hadron decays in Pb-Pb collisions at S NN  = 2.76 TeV with ALICE at the LHC
Fasel, Markus / ALICE Collaboration | 2012
141
Photoproduction of J/ψ and ρ0 in ultra-peripheral Pb-Pb collisions at S NN  = 2.76 TeV at ALICE
Roman, Veronica Canoa / ALICE Collaboration | 2012
147
Measurement of J/ψ production at mid-rapidity in pp and Pb-Pb collisions with ALICE
Di Giglio, C. / ALICE Collaboration | 2012
153
Quarkonium and heavy flavour physics in pp and Pb-Pb collisions with the ALICE muon spectrometer at the LHC
Bastid, N. / ALICE Collaboration | 2012
159
Dimuon results in PbPb and pp collisions in CMS
Jo, Mihee / CMS Collaboration | 2012
166
From RHIC to LHC: First lessons
Tserruya, Itzhak | 2012
178
Small-x physics in PHENIX
Awes, Terry C. / PHENIX Collaboration | 2012
183
Long-range correlation studies in pp and Pb-Pb collisions
Feofilov, Grigory | 2012
190
Jet measurements at STAR
Bruna, Elena / STAR Collaboration | 2012
196
Jets and photons in ALICE
Dietel, Thomas / ALICE Collaboration | 2012
203
Studies of jet quenching in PbPb collisions at s NN  = 2.76 TeV
Mehdiabadi, Saeid Paktinat / CMS Collaboration | 2012
209
In-medium energy loss and correlations in Pb-Pb collisions at s NN  = 2.76 TeV
Grosse-Oetringhaus, Jan Fiete / ALICE Collaboration | 2012
Front Matter for Volume 1422
| 2012
Back Matter for Volume 1422
| 2012

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