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

Alice Collaboration

doi:10.1140/epjc/s10052-019-7350-y

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

Alice Collaboration

Experimental Particle Physics

15 Citations (Scopus)

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Abstract

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

Original language	English
Article number	857
Journal	European Physical Journal C
Volume	79
Issue number	10
Number of pages	22
ISSN	1434-6044
DOIs	https://doi.org/10.1140/epjc/s10052-019-7350-y
Publication status	Published - 1 Oct 2019

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@article{f9e87dda9acd42ab91d4005567363eba,

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

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, 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.",

author = "S. Acharya and F. Torals-Acosta and J. Adam and D. Adamova and A. Adler and J Adolfsson and MM. Aggarwal and {Aglieri Rinella}, G. and Maria Agnello and N. Agrawal and Ian Bearden and Gaardh{\o}je, {Jens J{\o}rgen} and rtc312 rtc312 and Bourjau, {Christian Alexander} and Vytautas Vislavicius and Vojtech Pacik and Nielsen, {B{\o}rge Svane} and Katarina Gajdosova and bsm989 bsm989 and Freja Thoresen and Ante Bilandzic and Marek Chojnacki and You Zhou and {Alice Collaboration}",

year = "2019",

month = oct,

day = "1",

doi = "10.1140/epjc/s10052-019-7350-y",

language = "English",

volume = "79",

journal = "European Physical Journal C",

issn = "1434-6044",

publisher = "Springer",

number = "10",

}

TY - JOUR

T1 - Charged-particle production as a function of multiplicity and transverse spherocity in pp collisions at root s=5.02 and 13 TeV

AU - Acharya, S.

AU - Torals-Acosta, F.

AU - Adam, J.

AU - Adamova, D.

AU - Adler, A.

AU - Adolfsson, J

AU - Aggarwal, MM.

AU - Aglieri Rinella, G.

AU - Agnello, Maria

AU - Agrawal, N.

AU - Bearden, Ian

AU - Gaardhøje, Jens Jørgen

AU - rtc312, rtc312

AU - Bourjau, Christian Alexander

AU - Vislavicius, Vytautas

AU - Pacik, Vojtech

AU - Nielsen, Børge Svane

AU - Gajdosova, Katarina

AU - bsm989, bsm989

AU - Thoresen, Freja

AU - Bilandzic, Ante

AU - Chojnacki, Marek

AU - Zhou, You

AU - Alice Collaboration

PY - 2019/10/1

Y1 - 2019/10/1

N2 - 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.

AB - 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.

U2 - 10.1140/epjc/s10052-019-7350-y

DO - 10.1140/epjc/s10052-019-7350-y

M3 - Journal article

SN - 1434-6044

VL - 79

JO - European Physical Journal C

JF - European Physical Journal C

IS - 10

M1 - 857

ER -

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

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