Measurements of the Mass and Width of the ηc Using the Decay ψ(3686)γηc

M. Ablikim et al. (BESIII Collaboration)
Phys. Rev. Lett. 108, 222002 – Published 31 May 2012

Abstract

The mass and width of the lowest-lying S-wave spin singlet charmonium state, the ηc, are measured using a data sample of 1.06×108 ψ(3686) decays collected with the BESIII detector at the BEPCII storage ring. We use a model that incorporates full interference between the signal reaction, ψ(3686)γηc, and a nonresonant radiative background to describe the line shape of the ηc successfully. We measure the ηc mass to be 2984.3±0.6±0.6MeV/c2 and the total width to be 32.0±1.2±1.0MeV, where the first errors are statistical and the second are systematic.

  • Figure
  • Received 2 November 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.222002

© 2012 American Physical Society

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Vol. 108, Iss. 22 — 1 June 2012

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