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, S. P.; Adler, A.; Adolfsson, J.; Aggarwal, M. M.; Rinella, G. Aglieri; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahmad, S.; Ahn, S. U.; Aiola, S.; Akindinov, A.; Al-Turany, M.; Alam, S. N.; Albuquerque, D. S.D.; Aleksandrov, D.; Alessandro, B.; Alfanda, H. M.; Molina, R. Alfaro; Ali, B.; Ali, Y.; Alici, A.; Alkin, A.; Alme, J.; Alt, T.; Altenkamper, L.; Bedda, C.; Caffarri, D.; Christakoglou, P.; Grelli, A.; Jaelani, S.; Khabanova, Z.; Kuijer, P. G.; Margutti, J.; Mischke, A.; Mohanty, A. P.; Nooren, G.; Peitzmann, T.; Sas, M. H.P.; Simatovic, G.; Snellings, R. J.M.; Trzeciak, B. A.; van der Kolk, N.; van Doremalen, L. V.R.; van Leeuwen, M.; Veen, A. M.; Vermunt, L.; Yokoyama, H.
(2019) European Physical Journal C, volume 79, issue 10
(Article)
Abstract
We present a study of the inclusive charged-particle transverse momentum (pT) spectra as a function of charged-particle multiplicity density at mid-pseudorapidity, dNch/dη, 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
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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.
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Keywords: Engineering (miscellaneous), Physics and Astronomy (miscellaneous)
ISSN: 1434-6044
(Peer reviewed)
