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

Aad, Georges ; Abbott, Brad ; Abbott, Dale C ; Abed Abud, Adam ; Abeling, Kira ; Abhayasinghe, Deshan Kavishka ; Abidi, Syed Haider ; AbouZeid, Ossama Sherif Alexander ; Abraham, Nadine L ; Abramowicz, Halina ; Bjørke, Kristian ; Bugge, Magnar Kopangen ; Cameron, David Gordon ; Catmore, James Richard ; Garonne, Vincent ; Gramstad, Eirik ; Heggelund, Andreas ; Hellesund, Simen ; Håland, Even Simonsen ; Morisbak, Vanja ; Oppen, Henrik ; Ould-Saada, Farid ; Pedersen, Maiken ; Read, Alexander Lincoln ; Rye, Eli Bæverfjord ; Røhne, Ole Myren ; Sandaker, Heidi ; Vadla, Knut Oddvar Høie ; Buanes, Trygve ; Djuvsland, Julia Isabell ; Eigen, Gerald ; Fomin, Nikolai ; Latour, Bertrand Pascal Christian ; Lee, Graham Richard ; Lipniacka, Anna ; Stugu, Bjarne Sandvik ; Træet, Are Sivertsen ; Abreu, Henso ; Abulaiti, Yiming ; Acharya, Bobby S ; Achkar, Baida ; Adam, Lennart ; Adam-Bourdarios, Claire ; Adamczyk, Leszek ; Adamek, Lukas ; Adelman, Jareed ; Adersberger, Michael ; Adigüzel, Aytül ; Adorni, Sofia ; Adye, Tim ; ATLAS, Collaboration

Physical review. C, 2021-08, Vol.104 (2) [Periódico revisado por pares]

American Physical Society

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Título:
Exclusive dimuon production in ultraperipheral Pb+Pb collisions at √sNN=5.02 TeV with ATLAS
Autor: Aad, Georges ; Abbott, Brad ; Abbott, Dale C ; Abed Abud, Adam ; Abeling, Kira ; Abhayasinghe, Deshan Kavishka ; Abidi, Syed Haider ; AbouZeid, Ossama Sherif Alexander ; Abraham, Nadine L ; Abramowicz, Halina ; Bjørke, Kristian ; Bugge, Magnar Kopangen ; Cameron, David Gordon ; Catmore, James Richard ; Garonne, Vincent ; Gramstad, Eirik ; Heggelund, Andreas ; Hellesund, Simen ; Håland, Even Simonsen ; Morisbak, Vanja ; Oppen, Henrik ; Ould-Saada, Farid ; Pedersen, Maiken ; Read, Alexander Lincoln ; Rye, Eli Bæverfjord ; Røhne, Ole Myren ; Sandaker, Heidi ; Vadla, Knut Oddvar Høie ; Buanes, Trygve ; Djuvsland, Julia Isabell ; Eigen, Gerald ; Fomin, Nikolai ; Latour, Bertrand Pascal Christian ; Lee, Graham Richard ; Lipniacka, Anna ; Stugu, Bjarne Sandvik ; Træet, Are Sivertsen ; Abreu, Henso ; Abulaiti, Yiming ; Acharya, Bobby S ; Achkar, Baida ; Adam, Lennart ; Adam-Bourdarios, Claire ; Adamczyk, Leszek ; Adamek, Lukas ; Adelman, Jareed ; Adersberger, Michael ; Adigüzel, Aytül ; Adorni, Sofia ; Adye, Tim ; ATLAS, Collaboration
Assuntos: Fysik ; Natural Sciences ; Naturvetenskap ; Physical Sciences ; Subatomic Physics ; Subatomär fysik
É parte de: Physical review. C, 2021-08, Vol.104 (2)
Notas: NFR/310713
Descrição: Exclusive dimuon production in ultraperipheral collisions (UPC), resulting from photon-photon interactions in the strong electromagnetic fields of colliding high-energy lead nuclei, PbPb(γγ)→μ+μ−(Pb(★)Pb(★)), is studied using Lint=0.48nb−1 of √sNN=5.02TeV lead-lead collision data at the LHC with the ATLAS detector. Dimuon pairs are measured in the fiducial region pT,μ>4 GeV, ∣∣ημ|<2.4, invariant mass mμμ>10 GeV, and pT,μμ<2 GeV. The primary background from single-dissociative processes is extracted from the data using a template fitting technique. Differential cross sections are presented as a function of mμμ, absolute pair rapidity (∣∣yμμ∣∣), scattering angle in the dimuon rest frame (|cosϑ★μμ∣∣), and the colliding photon energies. The total cross section of the UPC γγ→μ+μ− process in the fiducial volume is measured to be σμμfid=34.1±0.3(stat.)±0.7(syst.) μb. Generally good agreement is found with calculations from STARlight, which incorporate the leading-order Breit-Wheeler process with no final-state effects, albeit differences between the measurements and theoretical expectations are observed. In particular, the measured cross sections at larger ∣∣yμμ∣∣ are found to be about 10–20% larger in data than in the calculations, suggesting the presence of larger fluxes of photons in the initial state. Modification of the dimuon cross sections in the presence of forward and/or backward neutron production is also studied and is found to be associated with a harder incoming photon spectrum, consistent with expectations.
Editor: American Physical Society
Idioma: Norueguês;Inglês

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

American Physical Society

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