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Constraining the initial stages of ultrarelativistic nuclear collisions

Journal Article · · Physical Review. D.
 [1];  [2];  [3];  [4]
  1. Univ. of Warsaw (Poland); Univ. of Wroclaw (Poland); OSTI
  2. National Centre for Nuclear Research, Warsaw (Poland)
  3. North Carolina State University, Raleigh, NC (United States)
  4. National Centre for Nuclear Research, Warsaw (Poland); University of Białystok (Poland)
+ Show Author Affiliations
It is frequently supposed that quark-gluon plasma created in heavy-ion collisions undergoes free streaming at early times. Here, we examine this issue based on the assumption that a universal attractor dominates the dynamics already at the earliest stages, which offers a way to connect the initial state with the start of the hydrodynamic expansion in an approximate but conceptually transparent fashion. We demonstrate that the centrality dependence of the measured particle multiplicities can be used to quantitatively constrain the pressure anisotropy and find that it strongly depends on the model of the initial energy deposition. As an illustration, we compare three initial state models and show that they predict rather different early-time values of the pressure anisotropy. This suggests that while assuming free streaming prior to hydrodynamization may be compatible with some initial state models, in general, features of the prehydrodynamic flow need to be matched with the model of the initial state.
Research Organization:
North Carolina State University, Raleigh, NC (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG02-03ER41260
OSTI ID:
1979908
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 7 Vol. 104; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
relativistic heavy-ion collisions
relativistic hydrodynamics