Transverse momentum fluctuations in ultrarelativistic Pb + Pb and p + Pb collisions with “wounded” quarks

Piotr Bożek and Wojciech Broniowski
Phys. Rev. C 96, 014904 – Published 7 July 2017

Abstract

We analyze the phenomenon of size-flow transmutation in ultrarelativistic nuclear collisions in a model where the initial size fluctuations are driven by the wounded quarks and the collectivity is provided by viscous hydrodynamics. It is found that the model properly reproduces the data for the transverse momentum fluctuations measured for Pb+Pb collisions at sNN=2.76 TeV by the ALICE Collaboration. The agreement holds for a remarkably wide range of centralities, from 0–5 % up to 70–80 %, and displays a departure from a simple scaling with (dNch/dη)1/2 in the form seen in the data. The overall agreement in the model with wounded quarks is significantly better than with nucleon participants. This feature joins the previously found wounded quark multiplicity scaling in the argumentation in favor of subnucleonic degrees of freedom in the early dynamics. We also examine in detail the correlations between measures of the initial size and final average transverse momentum of hadrons. Predictions are made for the transverse momentum fluctuations in p+Pb collisions at sNN=5.02 TeV.

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  • Received 3 February 2017

DOI:https://doi.org/10.1103/PhysRevC.96.014904

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Piotr Bożek1,* and Wojciech Broniowski2,3,†

  • 1AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, al. Mickiewicza 30, 30-059 Cracow, Poland
  • 2The H. Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Cracow, Poland
  • 3Institute of Physics, Jan Kochanowski University, 25-406 Kielce, Poland

  • *Piotr.Bozek@fis.agh.edu.pl
  • Wojciech.Broniowski@ifj.edu.pl

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Vol. 96, Iss. 1 — July 2017

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