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Title: Mass Ordering of Spectra from Fragmentation of Saturated Gluon States in High-Multiplicity Proton-Proton Collisions

Journal Article · · Physical Review Letters
 [1];  [1];  [1];  [2]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Physics
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Dept. of Physics; Heidelberg Univ. (Germany). Inst. for Theoretische Physik

The mass ordering of mean transverse momentum $$\langle$$pT$$\rangle$$ and of the Fourier harmonic coefficient v2 (pT) of azimuthally anisotropic particle distributions in high energy hadron collisions is often interpreted as evidence for the hydrodynamic flow of the matter produced. We investigate an alternative initial state interpretation of this pattern in high-multiplicity proton-proton collisions at the LHC. The QCD Yang-Mills equations describing the dynamics of saturated gluons are solved numerically with initial conditions obtained from the color-glass-condensate-based impact-parameter-dependent glasma model. The gluons are subsequently fragmented into various hadron species employing the well established Lund string fragmentation algorithm of the pythia event generator. Lastly, we find that this initial state approach reproduces characteristic features of bulk spectra, in particular, the particle mass dependence of $$\langle$$pT$$\rangle$$ and v2 (pT).

Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
SC0012704; AC02-05CH11231
OSTI ID:
1351716
Alternate ID(s):
OSTI ID: 1328960
Report Number(s):
BNL-113686-2017-JA; PRLTAO; R&D Project: KB0301020; KB0301020; TRN: US1701518
Journal Information:
Physical Review Letters, Vol. 117, Issue 16; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 66 works
Citation information provided by
Web of Science

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Cited By (10)

Collective flow and hydrodynamics in large and small systems at the LHC journal June 2017
Relativistic Fluid Dynamics in and out of Equilibrium book January 2019
Revealing the source of the radial flow patterns in proton–proton collisions using hard probes journal April 2017
Event engineering studies for heavy flavor production and hadronization in high multiplicity hadron-hadron and hadron-nucleus collisions journal October 2018
Charged-particle production as a function of multiplicity and transverse spherocity in pp collisions at $$ \sqrt{\mathbf{s}} =\mathbf{5.02}$$s=5.02 and 13 TeV journal October 2019
Modification of Jet Structure in High-Multiplicity pp Collisions due to Multiple-Parton Interactions and Observing a Multiplicity-Independent Characteristic Jet Size journal March 2019
Revealing the source of the radial flow patterns in proton--proton collisions using hard probes text January 2016
Collectivity and electromagnetic radiation in small systems text January 2016
Elliptic flow from color-dipole orientation in pp and pA collisions text January 2017
Parton model description of multiparticle azimuthal correlations in $pA$ collisions text January 2017

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