Вы находитесь на старом сайте НГУ. Перейти на новый сайт

ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2012, vol. 108, p. -

Measurements of the mass and width of the η c using the decay ψ(3686)→γη c

Ablikim M., Achasov M. N., Alberto D., Ambrose D. J., An F. F., An Q., An Z. H., Bai J. Z., Ferroli R. B., Ban Y., Becker J., Berger N., Bertani M. B., Bian J. M., Boger E., Bondarenko O., Boyko I., Briere R. A., Bytev V., Cai X., Calcaterra A. C., Cao G. F., Chang J. F., Chelkov G., Chen G., Chen H. S., Chen H. X., Chen J. C., Chen M. L., Chen S. J., Chen Y., Chen Y. B., Cheng H. P., Chu Y. P., Cronin-Hennessy D., Dai H. L., Dai J. P., Dedovich D., Deng Z. Y., Denysenko I., Destefanis M., Ding W. L., Ding Y., Dong L. Y., Dong M. Y., Du S. X., Fang J., Fang S. S., Feng C. Q., Fu C. D., Fu J. L., Gao Y., Geng C., Goetzen K., Gong W. X., Greco M., Gu M. H., Gu Y. T., Guan Y. H., Guo A. Q., Guo L. B., Guo Y. P., Han Y. L., Hao X. Q., Harris F. A., He K. L., He M., He Z. Y., Heng Y. K., Hou Z. L., Hu H. M., Hu J. F., Hu T., Huang B., Huang G. M., Huang J. S., Huang X. T., Huang Y. P., Hussain T., Ji C. S., Ji Q., Ji X. B., Ji X. L., Jia L. K., Jiang L. L., Jiang X. S., Jiao J. B., Jiao Z., Jin D. P., Jin S., Jing F. F., Kalantar-Nayestanaki N., Kavatsyuk M., Kuehn W., Lai W., Lange J. S., Leung J. K C

The mass and width of the lowest-lying S-wave spin singlet charmonium state, the η c, are measured using a data sample of 1.06×108 ψ(3686) decays collected with the BESIII detector at the BEPCII storage ring. We use a model that incorporates full interference between the signal reaction, ψ(3686)→γη c, and a nonresonant radiative background to describe the line shape of the η c successfully. We measure the η c mass to be 2984.3±0.6±0.6MeV/c2 and the total width to be 32.0±1.2±1.0MeV, where the first errors are statistical and the second are systematic. © 2012 American Physical Society.