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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2015, vol. 114, p. -

Study of e+e- →ωχcJ at center of mass energies from 4.21 to 4.42 GeV

Ablikim M., Achasov M. N., Ai X. C., Albayrak O., Albrecht M., Ambrose D. J., Amoroso A., An F. F., An Q., Bai J. Z., Ferroli R. Baldini, Ban Y., Bennett D. W., Bennett J. V., Bertani M., Bettoni D., Bian J. M., Bianchi F., Boger E., Bondarenko O., Boyko I., Briere R. A., Cai H., Cai X., Cakir O., Calcaterra A., Cao G. F., Cetin S. A., Chang J. F., Chelkov G., Chen G., Chen H. S., Chen H. Y., Chen J. C., Chen M. L., Chen S. J., Chen X., Chen X. R., Chen Y. B., Cheng H. P., Chu X. K., Chu Y. P., Cibinetto G., Cronin-Hennessy D., Dai H. L., Dai J. P., Dedovich D., Deng Z. Y., Denig A., Denysenko I., Destefanis M., De Mori F., Ding Y., Dong C., Dong J., Dong L. Y., Dong M. Y., Du S. X., Duan P. F., Fan J. Z., Fang J., Fang S. S., Fang X., Fang Y., Fava L., Feldbauer F., Felici G., Feng C. Q., Fioravanti E., Fu C. D., Gao Q., Gao Y., Garzia I., Goetzen K., Gong W. X., Gradl W., Greco M., Gu M. H., Gu Y. T., Guan Y. H., Guo A. Q., Guo L. B., Guo T., Guo Y., Guo Y. P., Haddadi Z., Hafner A., Han S., Han Y. L., Harris F. A., He K. L., He Z. Y., Held T., Heng Y. K.

© 2015 American Physical Society. 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-→ωχcJ (J=0, 1, 2). The process e+e-→ωχc0 is observed for the first time, and the Born cross sections at 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 ωχc0 signals at the other seven energies and the e+e-→ωχc1 and ωχc2 signals are not significant, and the upper limits on the cross sections are determined. By examining the ωχc0 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-→π+π-J/ψ. Assuming the ωχc0 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 9σ.