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.

References

CMS Collaboration, Observation of a new excited beauty strange baryon decaying to Ξ − b π +π −, Phys. Rev. Lett., 126 (2021) 252003, https://doi.org/10.1103/PhysRevLett.126.252003.

CMS Collaboration, Measurement of properties of B0 s → µ +µ − decays and search for B0 → µ +µ − with the CMS experiment, JHEP 2020 (2020) 188, https://doi.org/10.1007/JHEP04(2020)188.

CMS Collaboration, Observation of the B0 s →X(3872)φ decay, Phys. Rev. Lett. 125 (2020) 152001, https://doi.org/10.1103/PhysRevLett.125.152001.

CMS Collaboration, Observation of Two Excited B+ c States and Measurement of the B+ c (2S) Mass in pp Collisions at √ s = 13 TeV, Phys. Rev. Lett. 122 (2019) 132001, https://doi.org/10.1103/PhysRevLett.122.132001.

CMS Collaboration, Observation of the Z→ ψ`+` − decay in pp collisions at √ s = 13 TeV, Phys. Rev. Lett. 121 (2018) 141801, https://doi.org/10.1103/PhysRevLett.121.141801.

M. Diehl, and D. Ostermeier, and A. Schafer, Elements of a theory for multiparton interactions in QCD, JHEP 03 (2012) 089, https://doi.org/10.1007/JHEP03(2012)089.

P. Bartalini, and J. R. Gaunt, Multiple Parton Interactions at the LHC, (WSP, vol. 29, Singapore, 2019).

D. d’Enterria, and A. Snigirev, Double, triple, and n-parton scatterings in high-energy proton and nuclear collisions, Adv. Ser. Direct. High Energy Phys. 29 (2018) 159. https://doi.org/10.1142/97898132277670009.

LHCb Collaboration, Observation of J/ψ pair production in pp collisions at √ s = 7 TeV, Phys. Lett. B 707 (2012) 52, https://doi.org/10.1016/j.physletb.2011.12.015.

D0 Collaboration, Observation and Studies of Double J/ψ Production at the Tevatron, Phys. Rev. D 90 (2014) 111101, https://doi.org/10.1103/PhysRevD.90.111101.

CMS Collaboration, Measurement of prompt J/ψ pair production in pp collisions at √ s = 7 TeV JHEP 2014 (2014) 094, https://doi.org/10.1007/JHEP09(2014)094.

ATLAS Collaboration, Measurement of the prompt J/ψ pair production cross-section in pp collisions at √ s = 8 TeV with the ATLAS detector, Eur. Phys. J. C 77 (2017) 76, https://doi.org/10.1140/epjc/s10052-017-4644-9.

LHCb Collaboration, Measurement of the J/ψ pair production cross-section in pp collisions at √ s = 13 TeV, JHEP 06 (2017) 047, https://doi.org/10.1007/JHEP06(2017)047.

D0 Collaboration, Evidence for simultaneous production of J/ψ and Y mesons, Phys. Rev. Lett. 116 (2016) 082002, https://doi.org/10.1103/PhysRevLett.116.082002.

CMS Collaboration, Observation of Y(1S) pair production in proton-proton collisions at √ s = 8 TeV, JHEP 05 (2017) 013, https://doi.org/10.1007/JHEP05(2017)013.

CMS Collaboration, Measurement of the Y(1S) pair production cross section and search for resonances decaying to Y(1S)µ +µ − in proton-proton collisions at √ s = 13 TeV, Phys. Lett. B 808 (2020) 135578, https://doi.org/10.1016/j.physletb.2020.135578.

ATLAS Collaboration, Measurement of hard double-parton interactions in W(→ lν)+ 2 jet events at √ s = 7 TeV with the ATLAS detector, New J. Phys. 15 (2013) 033038, https://doi.org/10.1088/1367-2630/15/3/033038.

CMS Collaboration, Study of Double Parton Scattering Using W + 2-Jet Events in Proton-Proton Collisions at √ s = 7 TeV, arXiv:1312.5729, JHEP 03 (2014) 032, https://doi.org/10.1007/JHEP03(2014)032.

ATLAS Collaboration, Study of hard double-parton scattering in four-jet events in pp collisions at √ s = 7 TeV with the ATLAS experiment, JHEP 11 (2016) 110, https://doi.org/10.1007/JHEP11(2016)110.

CMS Collaboration, Constraints on the double-parton scattering cross section from same-sign W boson pair production in proton-proton collisions at √ s = 8 TeV, JHEP 02 (2018) 032, https://doi.org/10.1007/JHEP02(2018)032.

ATLAS Collaboration, Study of the hard double-parton scattering contribution to inclusive four-lepton production in pp collisions at √ s = 8 TeV with the ATLAS detector, Phys. Lett. B 790 (2019) 595, https://doi.org/10.1016/j.physletb.2019.01.062.

CMS Collaboration, Evidence for WW production from double-parton interactions in proton-proton collisions at √ s = 13 TeV, Eur. Phys. J. C 80 (2020) 41, https://doi.org/10.1140/epjc/s10052-019-7541-6.

CMS Collaboration, Measurement of double-parton scattering in inclusive production of four jets with low transverse momentum in proton-proton collisions at √ s = 13 TeV, arXiv:2109.13822.

ATLAS Collaboration, Observation and measurements of the production of prompt and non-prompt J/ψ mesons in association with a Z boson in pp collisions at √ s = 8 TeV with the ATLAS detector, Eur. Phys. J. C 75 (2015) 229. https://doi.org/10.1140/epjc/s10052-015-3406-9.

CMS Collaboration, The CMS experiment at the CERN LHC, JINST 3 (2008) S08004, https://doi.org/10.1088/1748-0221/3/08/S08004.

CMS Collaboration, Observation of triple J/ψ meson production in proton-proton collisions at √ s = 13 TeV, CMS-PASBPH-21-004, 2021, arXiv:2111.05370[hep-ex].

D. d’Enterria, and A. M. Snigirev, Triple parton scatterings in high-energy proton-proton collisions, Phys. Rev. Lett. 118 (2017) 122001, https://doi.org/10.1103/PhysRevLett.118.122001.

H.-S. Shao, HELAC-Onia: An automatic matrix element generator for heavy quarkonium physics, Comput. Phys. Commun. 184 (2013) 2562, https://doi.org/10.1016/j.cpc.2013.05.023.

H.-S. Shao, HELAC-Onia 2.0: an upgraded matrixelement and event generator for heavy quarkonium physics, arXiv:1507.03435, Comput. Phys. Commun. 198 (2016) 238. https://doi.org/10.1016/j.cpc.2015.09.011.

Particle Data Group, Review of Particle Physics, Phys. Rev. D 98 (2018) 030001, https://doi.org/10.1103/PhysRevD.98.030001.

Downloads

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 2022 Dec. 7];3(3):0308046 1-4. Available from: https://rmf.smf.mx/ojs/index.php/rmf-s/article/view/5999