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Observation of forward neutron multiplicity dependence of dimuon acoplanarity in ultraperipheral Pb-Pb collisions at sqrt(s[NN]) = 5.02 TeVстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 29 сентября 2021 г.
- Авторы: Belyaev A.V., Boos E., Ershov A.A., Gribushin A., Kaminskiy A., Katkov I., Kodolova O., Korotkikh V., Lokhtin I., Obraztsov S., Petrushanko S., Savrin V., Snigirev A., Vardanyan I., CMS Collaboration
- Журнал: Physical Review Letters
- Том: 127
- Номер: 12
- Год издания: 2021
- Издательство: American Physical Society
- Местоположение издательства: United States
- Первая страница: 122001
- DOI: 10.1103/physrevlett.127.122001
- Аннотация: 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, were 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 zero, one, or at least two 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.
- Добавил в систему: Лохтин Игорь Петрович