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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2014, vol. 112, 13, p. -

Observation of a charged charmoniumlike structure in e+e- → (D∗D∗)±π∓ at √s =4.26 GeV

Ablikim M., Achasov M. N., Albayrak A. O., Ambrose D. J., An F. F., An Q., Bai J. Z., Baldini Ferroli R., Ban Y., Becker J., Bennett J. V., Bertani M., Bian A. J M, Boger E., Bondarenko B. O., Boyko I., Braun S., Briere R. A., Bytev V., Cai H., Cai X., Cakir O., Calcaterra A., Cao A. G F, Cetin S. A., Chang J. F., Chelkov G., Chen G., Chen H. S., Chen J. C., Chen M. L., Chen S. J., Chen X. R., Chen Y. B., Cheng H. P., Chu Y. P., Cronin-Hennessy D., Dai H. L., Dai J. P., Dedovich D., Deng Z. Y., Denig A., Denysenko I., Destefanis M., Ding W. M., Ding Y., Dong L. Y., Dong M. Y., Du S. X., Fang J., Fang S. S., Fava L., Feng C. Q., Friedel P., Fu C. D., Fu J. L., Fuks O., Gao Y., Geng C., 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. P., Han Y. L., Harris F. A., He K. L., He M., He Z. Y., Held T., Heng Y. K., Hou Z. L., Hu C., Hu H. M., Hu J. F., Hu T., Huang G. M., Huang G. S., Huang J. S., Huang L., Huang X. T., Huang Y., Hussain T., Ji C. S., Ji Q.

© 2014 American Physical Society. We study the process e+e- → (D∗D∗)±π∓at a center-of-mass energy of 4.26 GeV using a 827 pb-1data sample obtained with the BESIII detector at the Beijing Electron Positron Collider. Based on a partial reconstruction technique, the Born cross section is measured to be (137±9±15) pb. We observe a structure near the (D∗D∗)± threshold in the π∓recoil mass spectrum, which we denote as the Z± c (4025). The measured mass and width of the structure are (4026.3 ± 2.6 ± 3.7) MeV/c2 and (24.8 ±5.6 ± 7.7) MeV, respectively. Its production ratio σ(e+e- → Z± c (4025)π∓) → (D∗D∗)±π∓/σ(e+e- → (D∗D∗)±π∓) is determined to be 0.65 ± 0.09 ± 0.06. The first uncertainties are statistical and the second are systematic.