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Exclusive dielectron production in ultraperipheral Pb+Pb collisions at √sNN = 5.02 TeV with ATLAS

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Exclusive production of dielectron pairs, γγ → e+e−, is studied using L int = 1.72 nb−1 of data from ultraperipheral collisions of lead nuclei at √sNN = 5.02 TeV recorded by the ATLAS detector at the LHC. The process of interest proceeds via photon–photon interactions in the strong electromagnetic f...

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Autori principali: Aad, Georges (Autore) , Baltes, Lisa Marie (Autore) , Bartels, Falk (Autore) , Castillo, Florencia Luciana (Autore) , Czurylo, Marta (Autore) , Rio, Fernando del (Autore) , Dittmeier, Sebastian (Autore) , Dunford, Monica (Autore) , Franchino, Silvia (Autore) , Klassen, Martin (Autore) , Mkrtchyan, Tigran (Autore) , Ott, Philipp (Autore) , Rassloff, Damir Fabrice (Autore) , Rodriguez Bosca, Sergi (Autore) , Sauer, Christof (Autore) , Schöning, André (Autore) , Schultz-Coulon, Hans-Christian (Autore) , Sothilingam, Varsiha (Autore) , Stamen, Rainer (Autore) , Starovoitov, Pavel (Autore) , Vigani, Luigi (Autore) , Weber, Sebastian (Autore) , Wessels, Martin (Autore) , Zinßer, Joachim (Autore)
Ente Autore: ATLAS Collaboration (Autore)
Natura: Article (Journal)
Lingua:inglese
Pubblicazione: 27 June 2023
In: Journal of high energy physics
Year: 2023, Fascicolo: 6, Pages: 1-42
ISSN:1029-8479
DOI:10.1007/JHEP06(2023)182
Accesso online:Verlag, kostenfrei, Volltext: https://doi.org/10.1007/JHEP06(2023)182
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Note sull'autore:The ATLAS collaboration*
Descrizione
Riassunto:Exclusive production of dielectron pairs, γγ → e+e−, is studied using L int = 1.72 nb−1 of data from ultraperipheral collisions of lead nuclei at √sNN = 5.02 TeV recorded by the ATLAS detector at the LHC. The process of interest proceeds via photon–photon interactions in the strong electromagnetic fields of relativistic lead nuclei. Dielectron production is measured in the fiducial region defined by following requirements: electron transverse momentum peT > 2.5 GeV, absolute electron pseudorapidity |ηe| < 2.5, dielectron invariant mass mee > 5 GeV, and dielectron transverse momentum peeT < 2 GeV. Differential cross-sections are measured as a function of mee, average peT , absolute dielectron rapidity |yee|, and scattering angle in the dielectron rest frame, |cos θ*|, in the inclusive sample, and also with a requirement of no activity in the forward direction. The total integrated fiducial cross-section is measured to be 215 + - 1(stat) +23 -20 (syst.) + - 4 (lumi.) μb. Within experimental uncertainties the measured integrated cross-section is in good agreement with the QED predictions from the Monte Carlo programs Starlight and SuperChic, confirming the broad features of the initial photon fluxes. The differential cross-sections show systematic differences from these predictions which are more pronounced at high |yee| and |cos θ*| values.
Descrizione del documento:*The ATLAS collaboration: G. Aad, L.M. Baltes, F. Bartels, F.L. Castillo, M.M. Czurylo, F. Del Rio, S.J. Dittmeier, M. Dunford, S. Franchino, M. Klassen, T. Mkrtchyan, P.S. Ott, D.F. Rassloff, S. Rodriguez Bosca, C. Sauer, A. Schoening, H-C. Schultz-Coulon, V. Sothilingam, R. Stamen, P. Starovoitov, L. Vigani, S.M. Weber, M. Wessels, J. Zinsser [und sehr viele weitere Personen]
Im Titel steht der Ausdruck "sNN" unter dem Wurzelsymbol
Gesehen am 14.02.2024
Descrizione fisica:Online Resource
ISSN:1029-8479
DOI:10.1007/JHEP06(2023)182

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