Measurement of B (ψ (3770) →γχc1) and search for ψ (3770) →γχc2

BESIII Collaboration

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Abstract

We report a measurement of the branching fraction for ψ(3770)→γχc1 and search for the transition ψ(3770)→γχc2 based on 2.92 fb-1 of e+e- data accumulated at s=3.773 GeV with the BESIII detector at the BEPCII collider. We measure B(ψ(3770)→γχc1)=(2.48±0.15±0.23)×10-3, which is the most precise measurement to date. The upper limit on the branching fraction of ψ(3770)→γχc2 at a 90% confidence level is B(ψ(3770)→γχc2)<0.64×10-3. The corresponding partial widths are Γ(ψ(3770)→γχc1)=(67.5±4.1±6.7) keV and Γ(ψ(3770)→γχc2)<17.4 keV.

Original languageEnglish
Article number092009
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume91
Issue number9
DOIs
Publication statusPublished - 26 May 2015
Externally publishedYes

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