Publication: Observation of Forward Neutron Multiplicity Dependence of Dimuon Acoplanarity in Ultraperipheral Pb-Pb Collisions at sNN =5.02 TeV
Дата
2021
Авторы
Sirunyan, A. M.
Tumasyan, A.
Adam, W.
Bergauer, T.
Matveev, V.
Chistov, R.
Danilov, M.
Oskin, A.
Parygin, P.
Polikarpov, S.
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Аннотация
© 2021 CERN, for the CMS Collaboration.The first measurement of the dependence of γγ→μ+μ- production on the multiplicity of neutrons emitted very close to the beam direction in ultraperipheral heavy ion collisions is reported. Data for lead-lead interactions at sNN=5.02 TeV, with an integrated luminosity of approximately 1.5 nb-1, are collected using the CMS detector at the LHC. The azimuthal correlations between the two muons in the invariant mass region 8<mμμ<60 GeV are extracted for events including 0, 1, or at least 2 neutrons detected in the forward pseudorapidity range |η|>8.3. The back-to-back correlation structure from leading-order photon-photon scattering is found to be significantly broader for events with a larger number of emitted neutrons from each nucleus, corresponding to interactions with a smaller impact parameter. This observation provides a data-driven demonstration that the average transverse momentum of photons emitted from relativistic heavy ions has an impact parameter dependence. These results provide new constraints on models of photon-induced interactions in ultraperipheral collisions. They also provide a baseline to search for possible final-state effects on lepton pairs caused by traversing a quark-gluon plasma produced in hadronic heavy ion collisions.
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Observation of Forward Neutron Multiplicity Dependence of Dimuon Acoplanarity in Ultraperipheral Pb-Pb Collisions at sNN =5.02 TeV / Sirunyan, A.M. [et al.] // Physical Review Letters. - 2021. - 127. - № 12. - 10.1103/PhysRevLett.127.122001
URI
https://www.doi.org/10.1103/PhysRevLett.127.122001
https://www.scopus.com/record/display.uri?eid=2-s2.0-85115323201&origin=resultslist
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https://openrepository.mephi.ru/handle/123456789/24726
https://www.scopus.com/record/display.uri?eid=2-s2.0-85115323201&origin=resultslist
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Alerting&SrcApp=Alerting&DestApp=WOS_CPL&DestLinkType=FullRecord&UT=WOS:000704665100006
https://openrepository.mephi.ru/handle/123456789/24726