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Title: Testing hydrodynamic descriptions of p+p collisions at $$\sqrt{s}=7$$ TeV

In high-energy collisions of heavy ions, experimental findings of collective flow are customarily associated with the presence of a thermalized medium expanding according to the laws of hydrodynamics. Recently, the ATLAS, CMS, and ALICE experiments found signals of the same type and magnitude in ultrarelativistic proton-proton collisions. In this study, the state-of-the-art hydrodynamic model SONIC is used to simulate the systems created in p+p collisions. By varying the size of the second-order transport coefficients, the range of applicability of hydrodynamics itself to the systems created in p+p collisions is quantified. It is found that hydrodynamics can give quantitatively reliable results for the particle spectra and the elliptic momentum anisotropy coefficient v 2. As a result, using a simple geometric model of the proton based on the elastic form factor leads to results of similar type and magnitude to those found in experiment when allowing for a small bulk viscosity coefficient.
 [1] ;  [2] ;  [1] ;  [3]
  1. Univ. of Colorado, Boulder, CO (United States)
  2. Univ. of Washington, Seattle, WA (United States)
  3. Univ. of Colorado, Boulder, CO (United States); Guizhou Univ. of Finance and Economics, Guiyang (China)
Publication Date:
Grant/Contract Number:
SC0008132; FG02-97ER41014
Published Article
Journal Name:
European Physical Journal. C, Particles and Fields
Additional Journal Information:
Journal Volume: 76; Journal Issue: 7; Journal ID: ISSN 1434-6044
Research Org:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Transverse Momentum; Systematic Uncertainty; Bulk Viscosity; Gluon Plasma; Proton Collision
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1437932