Please use this identifier to cite or link to this item: http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/7665
Title: Observation of triple J/ψ meson production in proton-proton collisions
Authors: CMS Collaboration
Tumasyan, S.
ALPANA, K.
DUBE, SOURABH
KANSAL, B.
LAHA, A.
PANDEY, S.
RASTOGI, A.
SHARMA, SEEMA et al.
Dept. of Physics
Keywords: Experimental particle physics
2023-MAR-WEEK1
TOC-MAR-2023
2023
Issue Date: Mar-2023
Publisher: Springer Nature
Citation: Nature Physics, 19, 338–350.
Abstract: 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.
URI: https://doi.org/10.1038/s41567-022-01838-y
http://dr.iiserpune.ac.in:8080/xmlui/handle/123456789/7665
ISSN: 1745-2473
1745-2481
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