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Title: The thermalization of soft modes in non-expanding isotropic quark gluon plasmas

Authors:
ORCiD logo; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1398641
Grant/Contract Number:
FG02-00ER41132
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Nuclear Physics. A
Additional Journal Information:
Journal Volume: 961; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-07 09:52:31; Journal ID: ISSN 0375-9474
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Blaizot, Jean-Paul, Liao, Jinfeng, and Mehtar-Tani, Yacine. The thermalization of soft modes in non-expanding isotropic quark gluon plasmas. Netherlands: N. p., 2017. Web. doi:10.1016/j.nuclphysa.2017.02.003.
Blaizot, Jean-Paul, Liao, Jinfeng, & Mehtar-Tani, Yacine. The thermalization of soft modes in non-expanding isotropic quark gluon plasmas. Netherlands. doi:10.1016/j.nuclphysa.2017.02.003.
Blaizot, Jean-Paul, Liao, Jinfeng, and Mehtar-Tani, Yacine. Mon . "The thermalization of soft modes in non-expanding isotropic quark gluon plasmas". Netherlands. doi:10.1016/j.nuclphysa.2017.02.003.
@article{osti_1398641,
title = {The thermalization of soft modes in non-expanding isotropic quark gluon plasmas},
author = {Blaizot, Jean-Paul and Liao, Jinfeng and Mehtar-Tani, Yacine},
abstractNote = {},
doi = {10.1016/j.nuclphysa.2017.02.003},
journal = {Nuclear Physics. A},
number = C,
volume = 961,
place = {Netherlands},
year = {Mon May 01 00:00:00 EDT 2017},
month = {Mon May 01 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.nuclphysa.2017.02.003

Citation Metrics:
Cited by: 5works
Citation information provided by
Web of Science

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  • We investigate the chemical equilibration of the parton distributions in collisions of two heavy nuclei. We use initial conditions obtained from a self-screened parton cascade calculation and, for comparison, from the HIJING model. We consider a one-dimensional as well as a three-dimensional expansion of the parton plasma and find that the onset of the transverse expansion impedes the chemical equilibration. At energies of 100 GeV/nucleon, the results for one-dimensional and three-dimensional expansions are quite similar except at large values of the transverse radius. At energies of several TeV/nucleon, the plasma initially approaches chemical equilibrium, but then is driven away frommore » it, when the transverse velocity gradients develop. We find that the total parton multiplicity density remains essentially unaffected by the flow, but the individual concentrations of quarks, antiquarks, and gluons are sensitive to the transverse flow. The consequences of the flow are also discernible in the transverse momenta of the partons and in the lepton pair spectra, where the flow causes a violation of the so-called M{sub T} scaling. {copyright} {ital 1997} {ital The American Physical Society}« less
  • We give a description of the various types of hydrodynamic flows which may appear in the expansion of a baryonless quark-gluon plasma undergoing a transition to normal hadronic matter. The stability of elementary solutions to hydrodynamic equations is discussed and general one-dimensional similarity waves are constructed. These are used as an input for a numerical method which allows the calculation of the three-dimensional expansion of the plasma. As an application, we present a study of the cylindrical expansion of a plasma formed in a head-on nucleus-nucleus collision using a family of equations of state leading to various types of flows.
  • We study the transverse-momentum imbalance (acoplanarity) of a gluon jet propagating in an expanding quark-gluon plasma. Under reasonable assumptions for the gluon cross section for interaction with a quark-gluon plasma, and with a hadron gas, and a proper space-time picture of the time evolution of matter produced in nuclear collisions, a simple formula is established relating the acoplanarity distribution to the jet emission angle, the total multiplicity of produced particles, and the nuclear radius. We find that for reasonable values of the jet-plasma cross section, the acoplanarity distribution stands out significantly beyond experimental cuts.
  • A new model (CUJET3.0) of jet quenching in nuclear collisions coupled to bulk data constrained (VISH2+1D) viscous hydrodynamic backgrounds is constructed by generalizing the perturbative QCD based (CUJET2.0) model to include two complementary non-perturbative chromodynamical features of the QCD con_nement cross-over phase transition near Tc ≈ 160 MeV: (1) the suppression of quark and gluon chromo-electric-charged (cec) degrees of freedom and (2) the emergence of chromo-magnetic-monopole (cmm) degrees of freedom. Such a semi Quark Gluon Monopole Plasma (sQGMP) microscopic scenario is tested by comparing predictions of the leading hadron nuclear modification factors, R AA h (pT > 10GeV=c;√s), and theirmore » azimuthal elliptic asymmetry v 2 h (pT > 10GeV=c;√s) with available data on h =π, D;B jet fragments from nuclear collisions at RHIC (√s = 0.2 ATeV) and LHC(√s = 2.76 ATeV). The cmm degrees of freedom in the sQGMP model near T c are shown to solve robustly the long standing R AA vs v 2 puzzle by predicting a maximum of the jet quenching parameter field g(E; T)/T 3 near T c. The robustness of CUJET3.0 model to a number of theoretical uncertainties is critically tested. Moreover the consistency of jet quenching with observed bulk perfect uidity is demonstrated by extrapolating the sQGMP qˆ down to thermal energy E ~ 3T scales and showing that the sQGMP shear viscosity to entropy density ratio η/s ≈ T 3/qˆ falls close to the unitarity bound, 1/4π, in the range (1–2)Tc. Detailed comparisons of the CUJET2.0 and CUJET3.0 models reveal the fact that remarkably different qˆ(T) dependence could be consistent with the same R AA data and could only be distinguished by anisotropy observables. Furthermore, these findings demonstrate clearly the inadequacy of focusing on the jet path averaged quantity as the only relevant medium property to characterize jet quenching, and point to the crucial roles of other essential factors beyond just the , such as the chromo electric and magnetic composition of the plasma, the screening masses and the running couplings at multiple scales which all strongly influence jet energy loss.« less
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