Nuclear Theory·nucl-th

Wednesday·January 27, 2016

5 papers—3 primary·2 cross-listed

04
[Submitted on 26 Jan 2016] (cross-list from hep-ph)
Kinetic freeze-out temperature and flow velocity extracted from transverse momentum spectra of final-state light flavor particles produced in collisions at RHIC and LHC
Hua-Rong Wei🇨🇳 · Fu-Hu Liu🇨🇳 · Roy A. Lacey🇺🇸
The transverse momentum spectra of final-state light flavor particles produced in proton-proton (p-p), copper-copper (Cu-Cu), gold-gold (Au-Au), lead-lead (Pb-Pb), and proton-lead (p-Pb) collisions for different centralities at relativistic heavy ion collider (RHIC) and large hadron collider (LHC) energies are studied in the framework of a multisource thermal model. The experimental data measured by the STAR, CMS, and ALICE Collaborations are consistent with the results calculated by the multi-component Erlang distribution and Tsallis Statistics. The effective temperature and real temperature (kinetic freeze-out temperature) of interacting system at the stage of kinetic freeze-out, the mean transverse flow velocity and mean flow velocity of particles, and the relationships between them are extracted. The dependences of effective temperature and mean (transverse) momentum on rest mass, moving mass, centrality, and center-of-mass energy, and the dependences of kinetic freeze-out temperature and mean (transverse) flow velocity on centrality, center-of-mass energy, and system size are obtained.
Comments:
28 pages, 13 figures. Minor correction. The European Physical Journal A, accepted
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1601.07045 [pdf]
EPJA(2016)·43 citations
05
[Submitted on 26 Jan 2016] (cross-list from hep-ph)
Event patterns extracted from transverse momentum and rapidity spectra of Z bosons and quarkonium states produced in pp and Pb-Pb collisions at LHC
Ya-Hui Chen🇨🇳 · Fu-Hu Liu🇨🇳 · Roy A. Lacey🇺🇸
Transverse momentum ( $p_{T}$ ) and rapidity ( $y$ ) spectra of $Z$ bosons and quarkonium states (some charmonium $c c ˉ$ mesons such as $J / ψ$ and $ψ (2 S)$ , and some bottomonium $b b ˉ$ mesons such as $Υ (1 S)$ , $Υ (2 S)$ , and $Υ (3 S)$ ) produced in proton-proton ( $pp$ ) and lead-lead (Pb-Pb) collisions at the large hadron collider (LHC) are uniformly described by a hybrid model of two-component Erlang distribution for $p_{T}$ spectrum and two-component Gaussian distribution for $y$ spectrum. The former distribution results from a multisource thermal model, and the latter one results from the revised Landau hydrodynamic model. The modelling results are in agreement with the experimental data measured in $pp$ collisions at center-of-mass energies $s = 2.76$ and 7 TeV, and in Pb-Pb collisions at center-of-mass energy per nucleon pair $s_{N N} = 2.76$ TeV. Based on the parameter values extracted from $p_{T}$ and $y$ spectra, the event patterns (particle scatter plots) in two-dimensional $p_{T}$ - $y$ space and in three-dimensional velocity space are obtained.
Comments:
22 pages, 14 figures. Advances in High Energy Physics, accepted
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
1601.07072 [pdf]
Adv.High Energy Phys.(2016)·6 citations

Affiliations

first authorsco-authorsvia INSPIRE

Kinetic freeze-out temperature and flow velocity extracted from transverse momentum spectra of final-state light flavor particles produced in collisions at RHIC and LHC

Event patterns extracted from transverse momentum and rapidity spectra of Z bosons and quarkonium states produced in pp and Pb-Pb collisions at LHC

Affiliations