Abstract

The decays χc1→J/ψμ+μ- and χc2→J/ψμ+μ- are observed and used to study the resonance parameters of the χc1 and χc2 mesons. The masses of these states are measured to be m(χc1)=3510.71±0.04(stat)±0.09(syst) MeV and m(χc2)=3556.10±0.06(stat)±0.11(syst) MeV, where the knowledge of the momentum scale for charged particles dominates the systematic uncertainty. The momentum-scale uncertainties largely cancel in the mass difference m(χc2)-m(χc1)=45.39±0.07(stat)±0.03(syst) MeV. The natural width of the χc2 meson is measured to be Γ(χc2)=2.10±0.20(stat)±0.02(syst) MeV. These results are in good agreement with and have comparable precision to the current world averages.

Original languageEnglish
Article number221801
Number of pages9
JournalPhysical Review Letters
Volume119
Issue number22
DOIs
Publication statusPublished - 28 Nov 2017

Keywords

  • CHARMONIUM
  • STATES
  • TOOL

Fingerprint

Dive into the research topics of 'χc1 and χc2 Resonance Parameters with the Decays χc1,c2 →j /ψμ+μ-'. Together they form a unique fingerprint.

Cite this