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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2013, vol. 88, p. -

Search for ηc(2S)hc→pp̄ decays and measurements of the χcJ→pp̄ branching fractions

Ablikim M., Achasov M. N., Ai X. C., Albayrak O., Ambrose D. J., An F. F., An Q., Bai J. Z., Baldini Ferroli R., Ban Y., Bennett J. V., Bertani M., Bian J. M., Boger E., Bondarenko O., Boyko I., Braun S., 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 J. C., Chen M. L., Chen S. J., Chen X., Chen X. R., Chen Y. B., Cheng H. P., Chu X. K., 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 C., Dong J., Dong L. Y., Dong M. Y., Du S. X., Fang J., Fang S. S., Fang Y., Fava L., Feng C. Q., Fu C. D., Fu J. L., Fuks O., Gao Q., 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., 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., Ji Q. P.

Using a sample of 1.06×108ψ(3686) events collected with the BESIII detector at BEPCII, the decays ηc(2S)→pp̄ and hc→pp̄ are searched for, where ηc(2S) and hc are reconstructed in the decay chains ψ(3686) →γηc(2S), ηc(2S)→pp̄ and ψ(3686)→π0hc, hc→pp̄, respectively. No significant signals are observed. The upper limits of the product branching fractions are determined to be B(ψ(3686)→γηc(2S)) ×B(ηc(2S)→pp̄)<1.4×10-6 and B(ψ(3686)→π0hc)×B(hc→pp̄) <1.3×10-7 at the 90% C.L.. The branching fractions for χcJ→pp̄ (J=0, 1, 2) are also measured to be (24.5±0.8±1.3,8.6±0.5±0.5,8.4±0.5±0.5) ×10-5, which are the world's most precise measurements. © 2013 American Physical Society.