Observation of e + e − → ϕ χ c 1 and ϕ χ c 2 at s = 4.600     GeV

• Published in: Physical review. D 2018-02, Vol.97 (3), Article 032008
• Main Authors: Ablikim, M., Achasov, M. N., Ahmed, S., Albrecht, M., Amoroso, A., An, F. F., An, Q., Bai, J. Z., Bai, Y., Bakina, O., Baldini Ferroli, R., Ban, Y., Bennett, D. W., Bennett, J. V., Berger, N., Bertani, M., Bettoni, D., Bian, J. M., Bianchi, F., Boger, E., Boyko, I., Briere, R. A., Cai, H., Cai, X., Cakir, O., Calcaterra, A., Cao, G. F., Cetin, S. A., Chai, J., Chang, J. F., Chelkov, G., Chen, G., Chen, H. S., Chen, J. C., Chen, M. L., Chen, P. L., Chen, S. J., Chen, X. R., Chen, Y. B., Chu, X. K., Cibinetto, G., 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., Dou, Z. L., Du, S. X., Duan, P. F., Fang, J., Fang, S. S., Fang, Y., Farinelli, R., Fava, L., Fegan, S., Feldbauer, F., Felici, G., Feng, C. Q., Fioravanti, E., Fritsch, M., Fu, C. D., Gao, Q., Gao, X. L., Gao, Y., Gao, Y. G., Gao, Z., Garzia, I., Goetzen, K., Gong, L., Gong, W. X., Gradl, W., Greco, M., Gu, M. H., Gu, Y. T., Guo, A. Q., Guo, R. P., Guo, Y. P., Haddadi, Z., Han, S., Hao, X. Q., Harris, F. A., He, K. L., He, X. Q., Heinsius, F. H., Held, T., Heng, Y. K., Holtmann, T., Hou, Z. L., Hu, H. M., Hu, T., Hu, Y.
• Format: Article
• Language: English
• Subjects: BESIII; NUCLEAR PHYSICS AND RADIATION PHYSICS
• ISSN: 2470-0010; 2470-0029
• DOI: 10.1103/PhysRevD.97.032008

Using a data sample collected with the BESIII detector operating at the BEPCII storage ring at a centerof- mass energy of √s = 4.600 GeV, we search for the production of e+e- → φχc0,1,2. A search is also performed for the charmonium-like state X(4140) in the radiative transition e+e- → γX(4140) with X(4140) subsequently decaying into φJ/ψ. The processes e+e- → φχc1 and φχc2 are observed for the first time, each with a statistical significance ofmore than 10σ, and the Born cross sections are measured to be (4.2+1.7 -1.0±0.3) pb and (6.7+3.4 -1.7 ± 0.5) pb, respectively, where the first uncertainties are statistical and the second systematic. No significant signals are observed for e+e- → φχc0 and e+e- → γX(4140) and upper limits on the Born cross sections at 90% confidence level are provided at √s = 4.600 GeV.