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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2010, vol. 104, p. -

Measurements of hc(P11) in ψ′ Decays

Ablikim M., Achasov M. N., An L., An Q., An Z. H., Bai J. Z., Ban Y., Berger N., Bian J. M., Boyko I., Briere R. A., Bytev V., Cai X., Cao G. F., Cao X. X., Chang J. F., Chelkov G., Chen G., Chen H. S., Chen J. C., Chen L. P., Chen M. L., Chen P., Chen S. J., Chen Y. B., Chu Y. P., Cronin-Hennessy D., Dai H. L., Dai J. P., Dedovich D., Deng Z. Y., Denysenko I., Destefanis M., Ding Y., Dong L. Y., Dong M. Y., Du S. X., Duan M. Y., Fang J., Feng C. Q., Fu C. D., Fu J. L., Gao Y., Geng C., Goetzen K., Gong W. X., Greco M., Grishin S., Gu Y. T., Guo A. Q., Guo L. B., Guo Y. P., Han S. 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., Hu X. W., Huang B., Huang G. M., Huang J. S., Huang X. T., Huang Y. P., Ji C. S., Ji Q., Ji X. B., Ji X. L., Jia L. K., Jiang L. L., Jiang X. S., Jiao J. B., Jin D. P., Jin S., Komamiya S., Kuehn W., Lange S., Leung J. K C, Li Cheng, Li Cui, Li D. M., Li F., Li G., Li H. B., Li J., Li J. C., Li Lei, Li Lu, Li Q. J., Li W. D., Li W. G., Li X. L., Li X. N., Li X. Q.

We present measurements of the charmonium state hc(P11) made with 106×106 ψ′ events collected by BESIII at BEPCII. Clear signals are observed for ψ′→π0hc with and without the subsequent radiative decay hc→γηc. First measurements of the absolute branching ratios B(ψ′→π0hc)=(8. 4±1.3±1.0)×10-4 and B(hc→γηc)=(54. 3±6.7±5.2)% are presented. A statistics-limited determination of the previously unmeasured hc width leads to an upper limit Γ(hc)<1. 44MeV (90% confidence). Measurements of M(hc)=3525.40±0.13±0. 18MeV/c2 and B(ψ′→π0hc) ×B(hc→γηc)=(4.58±0.40±0.50)×10 -4 are consistent with previous results. © 2010 The American Physical Society.