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ISSN - 16741137, Chinese Physics C, 2014, vol. 39, 4, p. -

Evidence for e<sup>+</sup>e<sup>-</sup> →γχc1,2 at center-of-mass energies from 4.009 to 4.360 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., Baldini Ferroli R., 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., Cibinetto G., Cronin-Hennessy D., Dai H. L., Dai J. P., Dbeyssi A., 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., Fritsch M., Fu C. D., Gao Q., Gao Y., Gao Z., 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.

Using data samples collected at center-of-mass energies of s = 4.009, 4.230, 4.260, and 4.360 GeV with the BESIII detector operating at the BEPCII collider, we perform a search for the process e<sup>+</sup>e<sup>-</sup> → γχ<inf>c</inf>J (J=0, 1, 2) and find evidence for e<sup>+</sup>e<sup>-</sup> → γχ<inf>c</inf>1 and e<sup>+</sup>e<sup>-</sup> → γχ<inf>c</inf>2 with statistical significances of 3.0σ and 3.4σ, respectively. The Born cross sections σ<sup>B</sup>(e<sup>+</sup>e<sup>-</sup> → γχ<inf>c</inf>J), as well as their upper limits at the 90% confidence level (C.L.) are determined at each center-of-mass energy.