QM 2011 - XXII International Conference on Ultrarelativistic Nucleus-Nucleus Collisions

Session

Correlations and fluctuations

Parallel session 2-2

24 May 2011, 15:00

Théâtre National (Centre Bonlieu)

Conveners

Correlations and fluctuations

• Guy Paic (Universidad Nacional Autonoma de Mexico (UNAM))

560. Triggered di-hadron correlations in PbPb collisions from the ALICE experiment

Dr Andrew Adare (Yale University)

24/05/2011, 15:00

Correlations and fluctuations

Parallel

Angular correlations between unidentified hadron trigger and associated particles are measured by the ALICE experiment for $0.5<p_t^{(t),(a)}<15$ GeV/c, where $p_t^{(t)}>p_t^{(a)}$. The modification of conditional yields in central Pb--Pb collisions is measured with respect to p--p ($I_{AA}$) and with respect to peripheral events ($I_{CP}$). Significant suppression is observed on...

452. Dihadron correlations in PbPb collisions at $\sqrt{s_{{}_{NN}}}$ = 2.76 TeV with CMS

Jeremy Louis Callner (Physics Department-University of Illinois at Chicago)

24/05/2011, 15:20

Correlations and fluctuations

Parallel

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 (|$\eta$|<2.4), the CMS tracker is ideally suited for detailed analyses of both short and long-range charged hadron...

566. Untriggered di-hadron correlations in PbPb \sqrt{s_{NN}} =2.76 TeV collisions from the ALICE experiment

Dr Anthony Timmins (University of Houston)

24/05/2011, 15:40

Correlations and fluctuations

Parallel

We present measurements of untriggered di-hadron correlations as a function of centrality in Pb-Pb \sqrt{s_{NN}} =2.76 TeV 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, and/or momentum...

487. A comprehensive study of the high-pt particle correlations in pp collisions at LHC/ALICE

Yaxian Mao (CCNU, Wuhan & LPSC, Grenoble)

24/05/2011, 16:00

Correlations and fluctuations

Parallel

Two-particle correlation with the high-pT triggers allows the study of the hard scattering phenomena like soft QCD radiation [1, 2], angular ordering [3] or jet frag- mentation in the low and intermediate pT region [4, 5] where full jet reconstruction is challenging. An analysis of the first ALICE pp data where charged particle, π0 and isolated photon are used as trigger particles will be...

523. Event-by-event mean $p_T$ fluctuations in pp and PbPb collisions measured by the ALICE experiment at the LHC

Stefan Heckel (Johann-Wolfgang-Goethe Univ.)

24/05/2011, 16:20

Correlations and fluctuations

Parallel

Non-statistical event-by-event fluctuations of the mean transverse momentum of charged particles in pp and Pb--Pb collisions are studied using the ALICE experiment at the LHC. The analysis is performed at $|\eta |<0.8$ and $0.15<p_T<2$~GeV/c. Multiplicity dependent results are obtained for pp collisions at $\sqrt{s}$~=~0.9, 2.76 and 7~TeV. Pb--Pb collisions at...

427. New results on event-by-event ratio fluctuations in PbPb collisions at CERN SPS energies

Tim Schuster (Frankfurt Institute for Advanced Studies, Goethe-University Frankfurt)

24/05/2011, 16:40

Correlations and fluctuations

Parallel

Event-by-event fluctuations of hadron ratios characterize the hadro-chemical composition of the hot and dense medium created in heavy-ion collisions. This makes the fluctuation signal sensitive to changes in the underlying structure of matter, and phase transition effects in particular. In the SPS energy range, inclusive hadronic observables indicate the onset of the deconfinement phase...

587. Femtoscopy of the system shape fluctuations in heavy ion collisions

Prof. Sergei Voloshin (Department of Physics and Astronomy-College of Science-Wayne Sta)

24/05/2011, 17:00

Correlations and fluctuations

Parallel

The system created in a heavy ion collision in general is not azimuthally symmetri; moreover, the initial spatial distribution, e.g. that of the energy density, fluctuates event-by-event even at fixed impact parameter. Because of particle interactions, this initial spatial asymmetry leads to anisotropies in particle emission -- the phenomenon called anisotropic flow. The best known anisotropy...