Observation of triple J/ψ meson production in proton-proton collisions

Observation of triple J/ψ meson production in proton-proton collisions

Bibliografiske detaljer
Parent link:Nature Physics.— .— London: Nature Publishing Group
Vol. 19, iss. 3.— 2023.— P. 338-350
Andre forfattere: Tumasyan A. R., Adam W. Wolfgang, Andrejkovic J. W., Babaev A. A. Anton Anatoljevich, Okhotnikov V. V. Vitaly Vladimirovich
Summary:Title screen
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 , 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
Текстовый файл
AM_Agreement
Sprog:engelsk
Udgivet: 2023
Fag:
электронный ресурс
труды учёных ТПУ
Online adgang:https://doi.org/10.1038/s41567-022-01838-y
Format: Electronisk Book Chapter
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=684837

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