Observation of Multiplicity Dependent Prompt χ c 1 ( 3872 ) and ψ ( 2 S ) Production in p p Collisions
Name
PhysRevLett.126.092001.pdf
Description
Published version
Size
544.53 KB
Format
Adobe PDF
Checksum (MD5)
b18db49efb6d7c181c3c0b68df0d32cc
Author(s)
Williams, Michael
Date Issued
2021
Journal
Physical Review Letters
Publisher
American Physical Society (APS)
Citation
Williams, Michael. 2021. "Observation of Multiplicity Dependent Prompt χ c 1 ( 3872 ) and ψ ( 2 S ) Production in p p Collisions." Physical Review Letters, 126 (9).
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1103/PHYSREVLETT.126.092001
