Measurements of the Mass and Width of the Eta(C) Using the Decay Psi (3686) -> Gamma Eta(C)
PHYSICAL REVIEW LETTERS(2012)
摘要
The mass and width of the lowest-lying S-wave spin singlet charmonium state, the eta(c), are measured using a data sample of 1: 06 x 10(8) psi (3686) decays collected with the BESIII detector at the BEPCII storage ring. We use a model that incorporates full interference between the signal reaction, psi(3686) -> gamma eta(c), and a nonresonant radiative background to describe the line shape of the eta(c) successfully. We measure the n(c) mass to be 2984.3 +/- 0.6 +/- 0.6 MeV/c(2) and the total width to be 32.0 +/- 1.2 +/- 1.0 MeV, where the first errors are statistical and the second are systematic.
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