Based on data samples collected with the BESIII detector at the BEPCII collider at nine center of mass energies from 4.21 to 4.42 GeV, we search for the production of e+e---> omega chi_cJ (J=0, 1, 2). The process e+e--->omega chi_c0 is observed for the first time, and the Born cross sections at sqrt(s)=4.23 and 4.26 GeV are measured to be (55.4±6.0±5.9) and (23.7±5.3±3.5)pb, respectively, where the first uncertainties are statistical and the second are systematic. The omega chi_c0 signals at the other seven energies and the e+e--->omega chi_c1 and omega chi_c2 signals are not significant, and the upper limits on the cross sections are determined. By examining the omega chi_c0 cross section as a function of center of mass energy, we find that it is inconsistent with the line shape of the Y(4260) observed in e+e- --> pi+pi-J/psi. Assuming the omega chi_c0 signals come from a single resonance, we extract the mass and width of the resonance to be (4230±8±6)MeV/c2 and (38±12±2)MeV, respectively, and the statistical significance is more than 9sigma.
Study of e+e- -->omega chi_cJ at center of mass energies from 4.21 to 4.42 GeV
Bettoni, D.;Cibinetto, G.;Fioravanti, E.;Garzia, I.;Santoro, V.;
2015
Abstract
Based on data samples collected with the BESIII detector at the BEPCII collider at nine center of mass energies from 4.21 to 4.42 GeV, we search for the production of e+e---> omega chi_cJ (J=0, 1, 2). The process e+e--->omega chi_c0 is observed for the first time, and the Born cross sections at sqrt(s)=4.23 and 4.26 GeV are measured to be (55.4±6.0±5.9) and (23.7±5.3±3.5)pb, respectively, where the first uncertainties are statistical and the second are systematic. The omega chi_c0 signals at the other seven energies and the e+e--->omega chi_c1 and omega chi_c2 signals are not significant, and the upper limits on the cross sections are determined. By examining the omega chi_c0 cross section as a function of center of mass energy, we find that it is inconsistent with the line shape of the Y(4260) observed in e+e- --> pi+pi-J/psi. Assuming the omega chi_c0 signals come from a single resonance, we extract the mass and width of the resonance to be (4230±8±6)MeV/c2 and (38±12±2)MeV, respectively, and the statistical significance is more than 9sigma.File | Dimensione | Formato | |
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PhysRevLett.114.092003.pdf
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PhysRevLett.114.092003-accepted.pdf
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