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Observation of the Charged Hadron Zc(3900) at sqrt(s)=4170 MeV | | T. Xiao
; S. Dobbs
; A. Tomaradze
; Kamal K. Seth
; | | Date: |
10 Apr 2013 | | Abstract: | The BES III Collaboration has reported observation of a resonance, which they
call Zc(3900), which decays into J/psi + a charged pion. This charged state
was observed as an intermediate resonance in their analysis of e+e-
annihilations into J/psi + pi+pi- at sqrt(s)=4260 MeV, the peak of the vector
state Y(4260). We observe this charged state, Zc(3900), at a 6 sigma
significance level in the analysis of 586 pb-1 of data taken with the CLEO-c
detector at psi(4160). Our results, M(Z)=3885+-5(stat)+-1(syst) MeV,
Gamma(Zc)=34+-12(stat)+-4(syst) MeV, and R=sigma(e+e- -> pi-+
Zc+-(3900))/sigma(e+e- -> pi+pi- J/psi)=(35+-11)% are in good agreement with
those reported by BES III. We also present evidence for the observation of the
neutral Zc0(3900) at a 3 sigma level of significance with parameters in
agreement with those of Zc+-(3900). Because our observations are made at the
peak of the 2 3D1 state of charmonium, we do not find any reason to attribute
any unconventional properties to the initial state formed by the e+e-
annihilations. | | Source: | arXiv, 1304.3036 | | Services: | Forum | Review | PDF | Favorites | |
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