4.8 Article

Mass Hierarchy in Identified Particle Distributions in Proton-Lead Collisions

Journal

PHYSICAL REVIEW LETTERS
Volume 111, Issue 17, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.111.172303

Keywords

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Funding

  1. Helmholtz International Centre for FAIR within the framework of the LOEWE Program (Landesoffensive zur Entwicklung Wissenschaftlich-Okonomischer Exzellenz)
  2. U. S. DOE [DE-FG02-93ER40764]
  3. Polish National Science Centre [DEC-2012/06/A/ST2/00390]
  4. PL-Grid infrastructure

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We study the mass dependence for identified particle average transverse momentum and harmonic flow coefficients in proton-lead (p-Pb) collisions, recently measured at the LHC. The collective mechanism in the p-Pb system predicts a specific mass ordering in these observables: the growth of the average transverse momentum with the particle mass and a mass splitting of the elliptic flow coefficient, i.e., smaller differential elliptic flow of protons than pions for p(T) < 2 GeV. This provides an opportunity to distinguish between the collective scenario and the mechanism based on the initial gluon dynamics in the evolution of the p-Pb system.

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