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

S. Acharya; J. Adolfsson; P. Christiansen; O. Matonoha; A.F. Nassirpour; A. Ohlson; A. Oskarsson; T. Richert; O.V. Rueda; D. Silvermyr; E. Stenlund; N. Zurlo; Large Ion Collider Experiment Collaboration

doi:10.1103/PhysRevLett.127.042302

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

S. Acharya, J. Adolfsson, P. Christiansen, O. Matonoha, A.F. Nassirpour, A. Ohlson, A. Oskarsson, T. Richert, O.V. Rueda, D. Silvermyr, E. Stenlund, N. Zurlo, Large Ion Collider Experiment Collaboration

Research output: Contribution to journal › Article › peer-review

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

Original language	English
Article number	042302
Journal	Physical Review Letters
Volume	127
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevLett.127.042302
Publication status	Published - 2021

Subject classification (UKÄ)

Subatomic Physics

Free keywords

Hadrons
Collision energies
Enhancement factor
Experimental conditions
Hadron-Hadron collisions
Many-body approach
Proton proton collisions
Proton-nucleus collisions
Strong dependences
Nuclear reactions

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10.1103/PhysRevLett.127.042302Licence: CC BY

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Acharya, S., Adolfsson, J., Christiansen, P., Matonoha, O., Nassirpour, A. F., Ohlson, A., Oskarsson, A., Richert, T., Rueda, O. V., Silvermyr, D., Stenlund, E., Zurlo, N., & Large Ion Collider Experiment Collaboration (2021). Soft-Dielectron Excess in Proton-Proton Collisions at s =13 TeV. Physical Review Letters, 127(4), Article 042302. https://doi.org/10.1103/PhysRevLett.127.042302

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

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",

keywords = "Hadrons, Collision energies, Enhancement factor, Experimental conditions, Hadron-Hadron collisions, Many-body approach, Proton proton collisions, Proton-nucleus collisions, Strong dependences, Nuclear reactions",

author = "S. Acharya and J. Adolfsson and P. Christiansen and O. Matonoha and A.F. Nassirpour and A. Ohlson and A. Oskarsson and T. Richert and O.V. Rueda and D. Silvermyr and E. Stenlund and N. Zurlo and {Large Ion Collider Experiment Collaboration}",

year = "2021",

doi = "10.1103/PhysRevLett.127.042302",

language = "English",

volume = "127",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

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Acharya, S, Adolfsson, J, Christiansen, P , Matonoha, O , Nassirpour, AF , Ohlson, A , Oskarsson, A, Richert, T, Rueda, OV, Silvermyr, D , Stenlund, E, Zurlo, N & Large Ion Collider Experiment Collaboration 2021, 'Soft-Dielectron Excess in Proton-Proton Collisions at s =13 TeV', Physical Review Letters, vol. 127, no. 4, 042302. https://doi.org/10.1103/PhysRevLett.127.042302

TY - JOUR

T1 - Soft-Dielectron Excess in Proton-Proton Collisions at s =13 TeV

AU - Acharya, S.

AU - Adolfsson, J.

AU - Christiansen, P.

AU - Matonoha, O.

AU - Nassirpour, A.F.

AU - Ohlson, A.

AU - Oskarsson, A.

AU - Richert, T.

AU - Rueda, O.V.

AU - Silvermyr, D.

AU - Stenlund, E.

AU - Zurlo, N.

AU - Large Ion Collider Experiment Collaboration

PY - 2021

Y1 - 2021

N2 - 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

AB - 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

KW - Hadrons

KW - Collision energies

KW - Enhancement factor

KW - Experimental conditions

KW - Hadron-Hadron collisions

KW - Many-body approach

KW - Proton proton collisions

KW - Proton-nucleus collisions

KW - Strong dependences

KW - Nuclear reactions

U2 - 10.1103/PhysRevLett.127.042302

DO - 10.1103/PhysRevLett.127.042302

M3 - Article

C2 - 34355943

SN - 0031-9007

VL - 127

JO - Physical Review Letters

JF - Physical Review Letters

IS - 4

M1 - 042302

ER -

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

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Subject classification (UKÄ)

Free keywords

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