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
UR - https://www.scopus.com/pages/publications/85111541130
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 -