期刊
PHYSICAL REVIEW C
卷 86, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.86.034908
关键词
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资金
- US Department of Energy under DOE [DE-AC02-98CH10886]
- BNL Lab Directed Research and Development [LDRD 10-043]
The event-by-event multiplicity distribution, the energy densities and energy density weighted eccentricity moments is an element of(n) (up to n = 6) at early times in heavy-ion collisions at both the BNL Relativistic Heavy Ion Collider (RHIC) (root s = 200 GeV) and the CERN Large Hardron Collider (LHC) (root s = 2.76 TeV) are computed in the IPGlasma model. This framework combines the impact parameter dependent saturation model (IP-Sat) for nucleon parton distributions (constrained by HERA deeply inelastic scattering data) with an event-by-event classical Yang-Mills description of early-time gluon fields in heavy-ion collisions. The model produces multiplicity distributions that are convolutions of negative binomial distributions without further assumptions or parameters. In the limit of large dense systems, the n-particle gluon distribution predicted by the Glasma-flux tube model is demonstrated to be nonperturbatively robust. In the general case, the effect of additional geometrical fluctuations is quantified. The eccentricity moments are compared to the MC-KLN model; a noteworthy feature is that fluctuation dominated odd moments are consistently larger than in the MC-KLN model.
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