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Dielectron production in proton-proton and proton-lead collisions at sNN =5.02 TeV

Acharya S.
•
Adamova D.
•
Adler A.
altro
Zurlo N.
2020
  • journal article

Periodico
PHYSICAL REVIEW C
Abstract
The first measurements of dielectron production at midrapidity (ηe<0.8) in proton-proton and proton-lead collisions at sNN=5.02TeV at the LHC are presented. The dielectron cross section is measured with the ALICE detector as a function of the invariant mass mee and the pair transverse momentum pT,ee in the ranges mee<3.5 GeV/c2 and pT,ee<8 GeV/c, in both collision systems. In proton-proton collisions, the charm and beauty cross sections are determined at midrapidity from a fit to the data with two different event generators. This complements the existing dielectron measurements performed at s=7 and 13 TeV. The slope of the s dependence of the three measurements is described by FONLL calculations. The dielectron cross section measured in proton-lead collisions is in agreement, within the current precision, with the expected dielectron production without any nuclear matter effects for e+e- pairs from open heavy-flavor hadron decays. For the first time at LHC energies, the dielectron production in proton-lead and proton-proton collisions are directly compared at the same sNN via the dielectron nuclear modification factor RpPb. The measurements are compared to model calculations including cold nuclear matter effects, or additional sources of dielectrons from thermal radiation.
DOI
10.1103/PhysRevC.102.055204
WOS
WOS:000592358300005
Archivio
http://hdl.handle.net/11368/2980630
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85097149284
https://journals.aps.org/prc/abstract/10.1103/PhysRevC.102.055204
Diritti
open access
license:creative commons
license uri:http://creativecommons.org/licenses/by/4.0/
FVG url
https://arts.units.it/bitstream/11368/2980630/1/PRC_102(2020)055204_1-21.pdf
Soggetti
  • Dielectron

  • hadron-hadron interac...

  • hadron-ion interactio...

Scopus© citazioni
2
Data di acquisizione
Jun 7, 2022
Vedi dettagli
Web of Science© citazioni
5
Data di acquisizione
Mar 25, 2024
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