A1 Journal article (refereed)
Inclusive photon production at forward rapidities in pp and p–Pb collisions at √sNN = 5.02 TeV (2023)

ALICE Collaboration. (2023). Inclusive photon production at forward rapidities in pp and p–Pb collisions at √sNN = 5.02 TeV. European Physical Journal C, 83, Article 661. https://doi.org/10.1140/epjc/s10052-023-11729-y

JYU authors or editors

Publication details

All authors or editors: ALICE Collaboration

Journal or series: European Physical Journal C

ISSN: 1434-6044

eISSN: 1434-6052

Publication year: 2023

Publication date: 25/07/2023

Volume: 83

Article number: 661

Publisher: Springer

Publication country: Germany

Publication language: English

DOI: https://doi.org/10.1140/epjc/s10052-023-11729-y

Research data link: https://www.hepdata.net/record/ins2637678

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/89027

Web address of parallel published publication (pre-print): https://arxiv.org/abs/2303.00590

Abstract

A study of multiplicity and pseudorapidity distributions of inclusive photons measured in pp and p–Pb collisions at a center-of-mass energy per nucleon–nucleon collision of √sNN = 5.02 TeV using the ALICE detector in the forward pseudorapidity region 2.3 < ηlab < 3.9 is presented. Measurements in p–Pb collisions are reported for two beam configurations in which the directions of the proton and lead ion beam were reversed. The pseudorapidity distributions in p–Pb collisions are obtained for seven centrality classes which are defined based on different event activity estimators, i.e., the charged-particle multiplicity measured at midrapidity as well as the energy deposited in a calorimeter at beam rapidity. The inclusive photon multiplicity distributions for both pp and p–Pb collisions are described by double negative binomial distributions. The pseudorapidity distributions of inclusive photons are compared to those of charged particles at midrapidity in pp collisions and for different centrality classes in p–Pb collisions. The results are compared to predictions from various Monte Carlo event generators. None of the generators considered in this paper reproduces the inclusive photon multiplicity distributions in the reported multiplicity range. The pseudorapidity distributions are, however, better described by the same generators.

Keywords: particle physics

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Ministry reporting: Yes

VIRTA submission year: 2023

JUFO rating: 2