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https://elib.bsu.by/handle/123456789/305534
Заглавие документа: | Observation of triple J/ψ meson production in proton-proton collisions |
Авторы: | Chekhovsky, V. Litomin, A. Makarenko, V. The CMS Collaboration |
Тема: | ЭБ БГУ::ЕСТЕСТВЕННЫЕ И ТОЧНЫЕ НАУКИ::Физика |
Дата публикации: | 2023 |
Издатель: | Nature Research |
Библиографическое описание источника: | Nat. Phys. 2023; 19(3):338-350. |
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 272−104+141(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. |
URI документа: | https://elib.bsu.by/handle/123456789/305534 |
DOI документа: | 10.1038/s41567-022-01838-y |
Scopus идентификатор документа: | 85162051065 |
Лицензия: | info:eu-repo/semantics/openAccess |
Располагается в коллекциях: | Статьи НИУ «Институт ядерных проблем» |
Полный текст документа:
Файл | Описание | Размер | Формат | |
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2111.05370.pdf | 1,42 MB | Adobe PDF | Открыть |
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