Observation of double 𝐽/𝜓 meson production in 𝑝⁢Pb collisions at √𝑠NN=8.16  TeV

Boos, E.E.; Ershov, A.A.; A, G.; Kaminskiy, A.; Khein, L.; Kodolova, O.L.; Korotkikh, V.L.; Obraztsov, S.V.; Petrushanko, S.V.; Savrin, V.I.; Snigirev, A.M.; Vardanyan, I.; CMS, C.

Авторы: Boos E.E., Ershov A.A., A Gribushin, Kaminskiy A., Khein L., Kodolova O.L., Korotkikh V.L., Obraztsov S.V., Petrushanko S.V., Savrin V.I., Snigirev A.M., Vardanyan I., CMS Collaboration
Журнал: Physical Review D
Том: 110
Год издания: 2024
Издательство: American Physical Society
Местоположение издательства: United States
Номер статьи: 092002
DOI: 10.1103/PhysRevD.110.092002
Аннотация: The first observation of the concurrent production of two 𝐽/𝜓 mesons in proton-nucleus collisions is presented. The analysis is based on a proton-lead (𝑝⁢Pb) data sample recorded at a nucleon-nucleon center-of-mass energy of 8.16 TeV by the CMS experiment at the CERN LHC and corresponding to an integrated luminosity of 174.6 nb−1. The two 𝐽/𝜓 mesons are reconstructed in their 𝜇+⁢𝜇− decay channels with transverse momenta 𝑝T >6.5 GeV and rapidity |𝑦| <2.4. Events where one of the 𝐽/𝜓 mesons is reconstructed in the dielectron channel are also considered in the search. The 𝑝⁢Pb →𝐽/𝜓⁢𝐽/𝜓+𝑋 process is observed with a significance of 5.3 standard deviations. The measured inclusive fiducial cross section, using the four-muon channel alone, is 𝜎⁡(𝑝⁢Pb →𝐽/𝜓⁢𝐽/𝜓 +𝑋) = 22.0 ±8.9⁢(stat) ±1.5⁢(syst) nb. A fit of the data to the expected rapidity separation for pairs of 𝐽/𝜓 mesons produced in single (SPS) and double (DPS) parton scatterings yields 𝜎𝑝⁢Pb→𝐽/𝜓⁢𝐽/𝜓+𝑋SPS=16.5±10.8⁢(stat)±0.1⁢(syst) nb and 𝜎𝑝⁢Pb→𝐽/𝜓⁢𝐽/𝜓+𝑋DPS =5.4 ±6.2⁢(stat) ±0.4⁢(syst) nb, respectively. This latter result can be transformed into a lower bound on the effective DPS cross section, closely related to the squared average interparton transverse separation in the collision, of 𝜎eff >1.0 mb at 95% confidence level.
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Observation of double 𝐽/𝜓 meson production in 𝑝⁢Pb collisions at √𝑠NN=8.16 TeVстатья Исследовательская статья

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