Observation of triple J/psi meson production in proton-proton collisions at sqrt(s) = 13 TeV

Belyaev, A.V.; Boos, E.; Dubinin, M.; Dudko, L.; Ershov, A.A.; Gribushin, A.; Klyukhin, V.; Kodolova, O.; Lokhtin, I.; Obraztsov, S.; Petrushanko, S.; Savrin, V.; Snigirev, A.; CMS, C.

Авторы: Belyaev A.V., Boos E., Dubinin M., Dudko L., Ershov A.A., Gribushin A., Klyukhin V., Kodolova O., Lokhtin I., Obraztsov S., Petrushanko S., Savrin V., Snigirev A., CMS Collaboration
Журнал: Nature Physics
Том: 19
Год издания: 2023
Издательство: Nature Publishing Group
Местоположение издательства: United Kingdom
Первая страница: 338
DOI: 10.1038/s41567-022-01838-y
Аннотация: Protons consist of three valence quarks, two up-quarks and one down-quark, held together by gluons and a sea of quark-antiquark pairs. Collectively, quarks and gluons are referred to as partons. In a proton-proton collision, typically only one parton of each proton undergoes a hard scattering - referred to as single-parton scattering - leaving the remainder of each proton only slightly disturbed. Here, we report the study of double- and triple-parton scatterings through the simultaneous production of three J/ψ mesons, which consist of a charm quark-antiquark pair, in proton-proton collisions recorded with the CMS experiment at the Large Hadron Collider. We observed this process - reconstructed through the decays of J/ψ mesons into pairs of oppositely charged muons - with a statistical significance above five standard deviations. We measured the inclusive fiducial cross section to be 272 +141−104 (stat) ± 17 (syst) fb, and compared it to theoretical expectations for triple-J/ψ meson production in single-, double- and triple-parton scattering scenarios. Assuming factorization of multiple hard-scattering probabilities in terms of single-parton scattering cross sections, double- and triple-parton scattering are the dominant contributions for the measured process.
Добавил в систему: Лохтин Игорь Петрович

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Observation of triple J/psi meson production in proton-proton collisions at sqrt(s) = 13 TeVстатья

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