Observation of Multiplicity Dependent Prompt χc1(3872) and ψ(2S) Production in pp Collisions

LHCb collaboration, S. Petrucci, S. Playfer

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The production of χc1(3872) and ψ(2S) hadrons is studied as a function of charged particle multiplicity in pp collisions at a center-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 2  fb−1. For both states, the fraction that is produced promptly at the collision vertex is found to decrease as charged particle multiplicity increases. The ratio of χc1(3872) to ψ(2S) cross sections for promptly produced particles is also found to decrease with multiplicity, while no significant dependence on multiplicity is observed for the equivalent ratio of particles produced away from the collision vertex in b-hadron decays. This behavior is consistent with a calculation that models the χc1(3872) structure as a compact tetraquark. Comparisons with model calculations and implications for the binding energy of the χc1(3872) state are discussed.
Original languageEnglish
Article number092001
Pages (from-to)1-11
Number of pages11
JournalPhysical Review Letters
Issue number9
Publication statusPublished - 5 Mar 2021


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