Charged-particle production as a function of multiplicity and transverse spherocity in pp collisions at [Formula omitted] and 13 TeV

• Published in: The European physical journal. C, Particles and fields Vol. 79; no. 10; pp. 1 - 22
• Main Authors: Acharya, S, Adamová, D, Adhya, S. P, Adler, A, Adolfsson, J, Aggarwal, M. M, Rinella, G. Aglieri
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 17-10-2019; Springer Nature B.V
• Subjects: Charged particles; Collisions; Density; Dependence; Particle production; Spectra; Transverse momentum
• ISSN: 1434-6044; 1434-6052
• DOI: 10.1140/epjc/s10052-019-7350-y

We present a study of the inclusive charged-particle transverse momentum ( [Formula omitted]) spectra as a function of charged-particle multiplicity density at mid-pseudorapidity, [Formula omitted], in pp collisions at [Formula omitted] and 13 TeV covering the kinematic range [Formula omitted] and [Formula omitted] GeV/c. The results are presented for events with at least one charged particle in [Formula omitted] (INEL [Formula omitted]). The [Formula omitted] spectra are reported for two multiplicity estimators covering different pseudorapidity regions. The [Formula omitted] spectra normalized to that for INEL [Formula omitted] show little energy dependence. Moreover, the high- [Formula omitted] yields of charged particles increase faster than the charged-particle multiplicity density. The average [Formula omitted] as a function of multiplicity and transverse spherocity is reported for pp collisions at [Formula omitted] TeV. For low- (high-) spherocity events, corresponding to jet-like (isotropic) events, the average [Formula omitted] is higher (smaller) than that measured in INEL [Formula omitted] pp collisions. Within uncertainties, the functional form of [Formula omitted] is not affected by the spherocity selection. While EPOS LHC gives a good description of many features of data, PYTHIA overestimates the average [Formula omitted] in jet-like events.