Charged-particle production as a function of multiplicity and transverse spherocity in pp collisions at √s=5.02 and 13 TeV



Acharya, S, Adamová, D, Adhya, SP, Adler, A, Adolfsson, J, Aggarwal, MM, Rinella, GA, Agnello, M, Agrawal, N, Ahammed, Z
et al (show 90 more authors) (2019) Charged-particle production as a function of multiplicity and transverse spherocity in pp collisions at √s=5.02 and 13 TeV. European Physical Journal C, 79 (10).

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Abstract

© 2019, CERN for the benefit of the ALICE collaboration. We present a study of the inclusive charged-particle transverse momentum (pT) spectra as a function of charged-particle multiplicity density at mid-pseudorapidity, d Nch/ d η, in pp collisions at s=5.02 and 13 TeV covering the kinematic range | η| < 0.8 and 0.15 < pT< 20 GeV/c. The results are presented for events with at least one charged particle in | η| < 1 (INEL>0). The pT spectra are reported for two multiplicity estimators covering different pseudorapidity regions. The pT spectra normalized to that for INEL>0 show little energy dependence. Moreover, the high-pT yields of charged particles increase faster than the charged-particle multiplicity density. The average pT as a function of multiplicity and transverse spherocity is reported for pp collisions at s=13 TeV. For low- (high-) spherocity events, corresponding to jet-like (isotropic) events, the average pT is higher (smaller) than that measured in INEL>0 pp collisions. Within uncertainties, the functional form of ⟨ pT⟩ (Nch) is not affected by the spherocity selection. While EPOS LHC gives a good description of many features of data, PYTHIA overestimates the average pT in jet-like events.

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 29 Oct 2019 10:35
Last Modified: 26 Nov 2020 09:08
DOI: 10.1140/epjc/s10052-019-7350-y
Open Access URL: https://doi.org/10.1140/epjc/s10052-019-7350-y
URI: http://livrepository.liverpool.ac.uk/id/eprint/3059853