Abstract

We present the study of the production of double J/ψ mesons using COMPASS data collected with a 190 GeV/c π beam scattering off NH3, Al and W targets. Kinematic distributions of the collected double J/ψ events are analysed, and the double J/ψ production cross section is estimated for each of the COMPASS targets. The NH3 results are compared to predictions from single- and double-parton scattering models as well as the pion intrinsic charm and the tetraquark exotic resonance hypotheses. It is demonstrated that the single parton scattering production mechanism gives the dominant contribution that is sufficient to describe the data. An upper limit on the double intrinsic charm content of the pion is evaluated. No significant signatures that could be associated with exotic tetraquarks are found in the double J/ψ mass spectrum.

Original languageEnglish
Article number137702
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume838
DOIs
StatePublished - 10 Mar 2023

Funding

FundersFunder number
CERN-RFBR12-02-91500
Daiko and Yamada Foundations
National Science FoundationPHY-1506416
National Science Foundation
Univerzita Karlova v PrazePRIMUS/22/SCI/017
Univerzita Karlova v Praze
Tomsk Polytechnic University
Deutsche Forschungsgemeinschaft
Japan Society for the Promotion of Science18002006, 20540299, 26247032, 18540281
Japan Society for the Promotion of Science
Ministry of Education, Culture, Sports, Science and Technology
Ministerstvo Školství, Mládeže a TělovýchovyLM2015058, LM2018104, LTT17018
Ministerstvo Školství, Mládeže a Tělovýchovy
Fundação para a Ciência e a TecnologiaCERN/FIS-PAR/0016/2021, CERN/FIS-PAR/0022/2019
Fundação para a Ciência e a Tecnologia
Bundesministerium für Bildung und Forschung
Israel Academy of Sciences and Humanities
LabexANR-10-LABX-0038, ANR-11-IDEX-0003-01
Labex
Narodowe Centrum Nauki2020/37/B/ST2/01547
Narodowe Centrum Nauki
Ministry of Science and Technology, Taiwan
Università degli Studi del Piemonte Orientale
Horizon 2020824093
Horizon 2020
European Regional Development Fund
Ministry of Science and Higher Education of the Russian Federation

    Keywords

    • COMPASS
    • Charmonia production
    • Double J/ψ
    • Intrinsic charm
    • Single parton scattering

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