Universality in hadronic and nuclear collisions at high energy

P. Castorina (INFN, Sezione di Catania, I-95123 Catania, Italy; Institute of Particle and Nuclear Physics, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 18000 Prague 8, Czech Republic) ; A. Iorio (Institute of Particle and Nuclear Physics, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 18000 Prague 8, Czech Republic) ; D. Lanteri (INFN, Sezione di Catania, I-95123 Catania, Italy; Dipartimento di Fisica e Astronomia, Università di Catania, I-95123 Catania, Italy) ; H. Satz (Fakultät für Physik, Universität Bielefeld, D-33501 Bielefeld, Germany) ; M. Spousta (Institute of Particle and Nuclear Physics, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 18000 Prague 8, Czech Republic)

Recent experimental results in proton-proton and in proton-nucleus collisions at Large Hadron Collider energies show a strong similarity to those observed in nucleus-nucleus collisions, where the formation of a quark-gluon plasma is expected. We discuss the comparison between small colliding systems and nucleus-nucleus collisions, for (a) the strangeness suppression factor γs and yields of multi-strange hadrons; (b) the average transverse momentum, pt, with particular attention to the low pt region where soft, nonperturbative effects are important; and (c) the elliptic flow scaled by the participant eccentricity. The universal behavior in hadronic and nuclear high energy collisions emerges for all these observables in terms of a specific dynamical variable which corresponds to the entropy density of initial system in the collision and which takes into account the transverse size of the initial configuration and its fluctuations.

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      "source": "APS", 
      "value": "Recent experimental results in proton-proton and in proton-nucleus collisions at Large Hadron Collider energies show a strong similarity to those observed in nucleus-nucleus collisions, where the formation of a quark-gluon plasma is expected. We discuss the comparison between small colliding systems and nucleus-nucleus collisions, for (a) the strangeness suppression factor <math><msub><mi>\u03b3</mi><mi>s</mi></msub></math> and yields of multi-strange hadrons; (b) the average transverse momentum, <math><msub><mi>p</mi><mi>t</mi></msub></math>, with particular attention to the low <math><msub><mi>p</mi><mi>t</mi></msub></math> region where soft, nonperturbative effects are important; and (c) the elliptic flow scaled by the participant eccentricity. The universal behavior in hadronic and nuclear high energy collisions emerges for all these observables in terms of a specific dynamical variable which corresponds to the entropy density of initial system in the collision and which takes into account the transverse size of the initial configuration and its fluctuations."
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Published on:
11 May 2020
Publisher:
APS
Published in:
Physical Review C , Volume 101 (2020)
Issue 5
DOI:
https://doi.org/10.1103/PhysRevC.101.054902
arXiv:
1912.12513
Copyrights:
Published by the American Physical Society
Licence:
CC-BY-4.0

Fulltext files: