Observation of triple J/ψ meson production in proton-proton collisions at √ s = 13 TeV

Authors

  • Stefanos Leontsinis University of Zurich

DOI:

https://doi.org/10.31349/SuplRevMexFis.3.0308046

Keywords:

CMS, QCD, triple parton scattering, J/ψ meson

Abstract

The first observation of the three J/ψ meson production in proton-proton collisions at a center-of-mass energy of 13 TeV in final states with three µ +µ − pairs is reported. The analysis is based on a data sample recorded by the CMS experiment at the CERN LHC corresponding to an integrated luminosity of 133 fb−1 . The pp → J/ψ J/ψ J/ψ X process is observed with a significance in excess of five standard deviations. The fiducial cross section for this process is found to be σ(pp → J/ψ J/ψ J/ψ X) = 272+141 −104(stat)±17(syst) fb. The result is compared to theoretical expectations for the production of three J/ψ mesons in single (SPS), double- (DPS), and triple- (TPS) parton scattering processes. Under the most economical assumption of factorization of multiple hard scattering probabilities in terms of SPS cross sections, the measured final state is found to be dominated by DPS and TPS contributions. A value of the associated DPS effective cross section parameter of σeff,DPS = 2.7 +1.4 −1.0 (exp)+1.5 −1.0 (theo) mb, related to the transverse distribution of partons in the proton, is derived.

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Published

2022-05-18

How to Cite

1.
Leontsinis S. Observation of triple J/ψ meson production in proton-proton collisions at √ s = 13 TeV. Supl. Rev. Mex. Fis. [Internet]. 2022 May 18 [cited 2024 Mar. 29];3(3):0308046 1-4. Available from: https://rmf.smf.mx/ojs/index.php/rmf-s/article/view/5999