Double $J/\psi$ production in pion-nucleon scattering at COMPASS

Abstract

We present the study of the production of double $J/\psi$ mesons using COMPASS data collected with a 190 GeV/$c$ ${\pi }^{-}$ beam scattering off NH${}_3$, Al and W targets. Kinematic distributions of the collected double $J/\psi$ events are analysed, and the double $J/\psi$ production cross section is estimated for each of the COMPASS targets. The 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 pion is evaluated. No significant signatures that could be associated with exotic tetraquarks are found in the double $J/\psi$ mass spectrum.

arXiv comment12 pages, 4 figures

References in corpus (22)

• An Introduction to PYTHIA 8.2
• The COMPASS Experiment at CERN
• First Observation of the Doubly Charmed Baryon Xi_cc^+
• Observation of structure in the $J/\psi$-pair mass spectrum
• Confirmation of the Double Charm Baryon Xi_cc+ via its Decay to p D+ K-
• Observation of $J/\psi$ pair production in pp collisions at $\sqrt{s}=7TeV$
• HELAC-Onia: an automatic matrix element generator for heavy quarkonium physics
• A non-relativistic model for the $[cc][\bar{c}\bar{c}]$ tetraquark
• All-heavy tetraquarks
• First measurement of transverse-spin-dependent azimuthal asymmetries in the Drell-Yan process
• Double J/psi-meson Production at LHC and 4c-tetraquark state
• Measurement of the prompt $J/\psi$ pair production cross-section in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• NRQCD Analysis of Bottomonium Production at the Tevatron
• Observation and studies of double J/psi production at the Tevatron
• Strong decays of fully-charm tetraquarks into di-charmonia
• Intrinsic Charm Contribution to Double Quarkonium Hadroproduction
• Double-quarkonium production at a fixed-target experiment at the LHC (AFTER@LHC)
• Observation potential for χ_b at the Tevatron and LHC
• Production of the Doubly Charmed Baryons at the SELEX experiment -- The double intrinsic charm approach
• Resolving the SELEX--LHCb Double-Charm Baryon Conflict: The Impact of Intrinsic Heavy-Quark Hadroproduction and Supersymmetric Light-Front Holographic QCD
• Phenomenological study for the search of evidence for intrinsic charm at the COMPASS experiment
• Resolving the SELEX-LHCb double-charm baryon conflict: the impact of intrinsic heavy-quark hadroproduction and supersymmetric light-front holographic QCD