Quark Matter 2012

Session

Plenary VIB: Flash Talks

18 Aug 2012, 09:20

207. Modeling the Impact Parameter Dependence of the nPDFs With EKS98 and EPS09 Global Fits

Ilkka Helenius (U)

18/08/2012, 09:20

Pre-equilibrium and initial state dynamics

Oral Presentation

The knowledge of the parton distribution functions (PDFs) is essential for interpreting any hard-process results from hadronic and nuclear collisions. The nuclear modifications of PDFs have been successfully determined through a global DGLAP analysis e.g. in the sets EKS98 and more recently EPS09. So far the nuclear PDFs (nPDFs) in the global fits have been taken to be spatially independent....

315. Exploring cold nuclear matter effects in d+Au with high-pT reconstructed jets at PHENIX

Dennis Perepelitsa (Columbia University)

18/08/2012, 09:30

Jets

Oral Presentation

Proton-nucleus (p+A) collisions can be used to investigate cold nuclear matter effects on hard-scattered partons and serve as an important baseline for heavy-ion collisions. In particular, p+A collisions at different centrality selections can probe the impact parameter dependence of nuclear parton distribution functions, initial state energy loss and final state parton interactions in the cold...

241. Jet shapes in 2.76 TeV PbPb collisions with CMS

Ms Yaxian Mao (Vanderbilt University (US))

18/08/2012, 09:40

Jets

Oral Presentation

The poster presents jet shapes, defined as the fractional transverse momentum distribution as a function of the distance r from the jet axis, where the jets are reconstructed by the anti-kT clustering algorithm. We determine the energy flow inside the jet by using particles reconstructed and calibrated using the Particle Flow algorithm. Different background subtraction methods are employed to...

220. Jet reconstruction and b-jet identification in PbPb collisions with CMS

Jorge A Robles (Rutgers, State Univ. of New Jersey (US))

18/08/2012, 09:50

Heavy flavor and quarkonium production

Oral Presentation

The flavor dependence of jet quenching is a powerful handle to discriminate models of parton energy loss in heavy ion collisions. While there is evidence for a strong energy loss of heavy quarks from single particle measurements, heavy flavor tagging of fully reconstructed jets has thus far not been achieved in heavy ion collisions. In this talk we demonstrate the capacity of CMS to identify...

444. Measurement of jet spectra with charged particles in Pb-Pb collisions at $\sqrt{s_{NN}}$=2.76 TeV with the ALICE detector at the LHC

Marta Verweij (University of Utrecht (NL))

18/08/2012, 10:00

Jets

Oral Presentation

We report a measurement of transverse momentum spectra of jets detected with the ALICE detector in Pb-Pb collisions at $\sqrt{s_{N}N}$=2.76 TeV. Jets are reconstructed from charged particles using the anti-$k_T$ jet algorithm. The transverse momentum of tracks is measured down to 150 MeV/c which gives access to the low $p_T$ fragments of the jet. The background from soft particle production...

110. $\omega (782)$ and $\varphi (1020)$ mesons from di-leptonic decay channels at the STAR experiment

Masayuki Wada (University of Texas at Austin)

18/08/2012, 10:10

Hadron thermodynamics and chemistry

Oral Presentation

Hadronic resonances can play a pivotal role in providing experimental evidence for partial chiral symmetry restoration in the deconfined quark-gluon phase produced in high energy nucleus-nucleus collisions. Their lifetimes, which are comparable to the lifetime of the fireball, make them a valuable tool to study medium modifications to the resonant state due to the chiral phase transition...

62. Emission of Low Momentum Particles at Large Angles from Jet

Mr Yasuki Tachibana (Department of Physics, The University of Tokyo)

18/08/2012, 10:20

Jets

Oral Presentation

Hot and dense QCD matter, namely the quark gluon plasma, is created in high energy heavy ion collisions. High energy partons are also created through initial hard scatterings and have to traverse the QGP medium. These energetic partons are subject to lose their energy due to strong interactions with the medium. So jets in heavy ion collisions are expected to give information about the stopping...

617. Hydrodynamic Fluctuations and Two‐Particle Correlations

Todd Springer (U)

18/08/2012, 10:30

New theoretical developments

Oral Presentation

We investigate contributions from local hydrodynamic fluctuations to the near side ridge in the two‐particle correlation data from heavy ion collisions. We introduce a local perturbation on top of a hydrodynamic flow which respects conformal symmetry and incorporates radial flow. The subsequent evolution of the perturbation is determined by hydrodynamics; after freeze‐out, we examine the...