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Soft-Dielectron Excess in Proton-Proton Collisions at s =13 TeV

Acharya, S. ; Adolfsson, J. LU ; Christiansen, P. LU ; Matonoha, O. LU ; Nassirpour, A.F. LU orcid ; Ohlson, A. LU ; Oskarsson, A. LU ; Richert, T. LU ; Rueda, O.V. LU and Silvermyr, D. LU orcid , et al. (2021) In Physical Review Letters 127(4).
Abstract
A measurement of dielectron production in proton-proton (pp) collisions at s=13 TeV, recorded with the ALICE detector at the CERN LHC, is presented in this Letter. The data set was recorded with a reduced magnetic solenoid field. This enables the investigation of a kinematic domain at low dielectron (ee) invariant mass mee and pair transverse momentum pT,ee that was previously inaccessible at the LHC. The cross section for dielectron production is studied as a function of mee, pT,ee, and event multiplicity dNch/dη. The expected dielectron rate from hadron decays, called hadronic cocktail, utilizes a parametrization of the measured η/π0 ratio in pp and proton-nucleus collisions, assuming that this ratio shows no strong dependence on... (More)
A measurement of dielectron production in proton-proton (pp) collisions at s=13 TeV, recorded with the ALICE detector at the CERN LHC, is presented in this Letter. The data set was recorded with a reduced magnetic solenoid field. This enables the investigation of a kinematic domain at low dielectron (ee) invariant mass mee and pair transverse momentum pT,ee that was previously inaccessible at the LHC. The cross section for dielectron production is studied as a function of mee, pT,ee, and event multiplicity dNch/dη. The expected dielectron rate from hadron decays, called hadronic cocktail, utilizes a parametrization of the measured η/π0 ratio in pp and proton-nucleus collisions, assuming that this ratio shows no strong dependence on collision energy at low transverse momentum. Comparison of the measured dielectron yield to the hadronic cocktail at 0.15 (Less)
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author collaboration
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Hadrons, Collision energies, Enhancement factor, Experimental conditions, Hadron-Hadron collisions, Many-body approach, Proton proton collisions, Proton-nucleus collisions, Strong dependences, Nuclear reactions
in
Physical Review Letters
volume
127
issue
4
article number
042302
publisher
American Physical Society
external identifiers
  • scopus:85111541130
  • pmid:34355943
ISSN
0031-9007
DOI
10.1103/PhysRevLett.127.042302
language
English
LU publication?
yes
id
86bfc2a7-ab7f-4fdf-ab05-9992a99554a4
date added to LUP
2022-08-03 11:55:21
date last changed
2023-05-10 15:27:44
@article{86bfc2a7-ab7f-4fdf-ab05-9992a99554a4,
  abstract     = {{A measurement of dielectron production in proton-proton (pp) collisions at s=13 TeV, recorded with the ALICE detector at the CERN LHC, is presented in this Letter. The data set was recorded with a reduced magnetic solenoid field. This enables the investigation of a kinematic domain at low dielectron (ee) invariant mass mee and pair transverse momentum pT,ee that was previously inaccessible at the LHC. The cross section for dielectron production is studied as a function of mee, pT,ee, and event multiplicity dNch/dη. The expected dielectron rate from hadron decays, called hadronic cocktail, utilizes a parametrization of the measured η/π0 ratio in pp and proton-nucleus collisions, assuming that this ratio shows no strong dependence on collision energy at low transverse momentum. Comparison of the measured dielectron yield to the hadronic cocktail at 0.15}},
  author       = {{Acharya, S. and Adolfsson, J. and Christiansen, P. and Matonoha, O. and Nassirpour, A.F. and Ohlson, A. and Oskarsson, A. and Richert, T. and Rueda, O.V. and Silvermyr, D. and Stenlund, E. and Zurlo, N.}},
  issn         = {{0031-9007}},
  keywords     = {{Hadrons; Collision energies; Enhancement factor; Experimental conditions; Hadron-Hadron collisions; Many-body approach; Proton proton collisions; Proton-nucleus collisions; Strong dependences; Nuclear reactions}},
  language     = {{eng}},
  number       = {{4}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Letters}},
  title        = {{Soft-Dielectron Excess in Proton-Proton Collisions at s =13 TeV}},
  url          = {{http://dx.doi.org/10.1103/PhysRevLett.127.042302}},
  doi          = {{10.1103/PhysRevLett.127.042302}},
  volume       = {{127}},
  year         = {{2021}},
}