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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2014, vol. 89, p. -

Search for the radiative transitions ψ (3770) →γηc and γηc (2S)

Ablikim M., Achasov M. N., Ai X. C., Albayrak O., Albrecht M., 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., Fan J. Z., Fang J., Fang S. S., Fang Y., Fava L., Feng C. Q., Fu C. D., 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., 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 H. P., Huang J. S., Huang L., Huang X. T., Huang Y., Hussain T., Ji C. S., Ji Q.

By using a 2.92fb-1 data sample taken at s=3.773GeV with the BESIII detector operating at the BEPCII collider, we search for the radiative transitions ψ(3770)→γηc and γηc(2S) through the hadronic decays ηc(ηc(2S))→KS0K±π. No significant excess of signal events above background is observed. We set upper limits at a 90% confidence level for the product branching fractions to be B(ψ(3770) →γηc)×B(ηc→KS0K±π)<1.6×10-5 and B(ψ(3770)→γηc(2S))×B(ηc(2S)→KS0K±π) <5.6×10-6. Combining our result with world-average values of B(ηc(ηc(2S))→KS0K±π), we find the branching fractions B(ψ(3770)→γηc)<6.8×10-4 and B(ψ(3770) →γηc(2S))<2.0×10-3 at a 90% confidence level. © 2014 American Physical Society.