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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2013, vol. 87, p. -

Evidence for η<inf>c</inf>(2S) in ψ(3686)→γKS0K <sup>±</sup>π<sup>+</sup>π<sup>+</sup>π<sup>-</sup>

Ablikim M., Achasov M. N., Albayrak 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 J. M., Boger E., Bondarenko O., Boyko I., Briere R. A., Bytev V., 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 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., 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., Huang Y. P., Hussain T., Ji C. S., Ji Q., Ji Q. P., Ji X. B., Ji X. L., Jiang L. L., Jiang X. S., Jiao J. B.

© 2013 American Physical Society. We search for the M1 radiative transition ψ(3686) →γη<inf>c</inf>(2S) by reconstructing the exclusive η<inf>c</inf>(2S)→KS0K<sup>±</sup>π<sup>+</sup>π <sup>+</sup>π<sup>-</sup> decay using 1.06×108 ψ(3686) events collected with the BESIII detector. The signal is observed with a statistical significance of greater than 4 standard deviations. The measured mass of the η<inf>c</inf>(2S) is 3646.9±1.6(stat)±3.6(syst) MeV/c2, and the width is 9.9±4.8(stat)±2.9(syst) MeV/c2. The product branching fraction is measured to be B(ψ(3686)→γη<inf>c</inf>(2S)) ×B(η<inf>c</inf>(2S)→KS0K<sup>±</sup>π<sup>+</sup>π <sup>+</sup>π<sup>-</sup>)=(7.03±2.10(stat)±0.70(syst)) ×10<sup>-</sup>6. This measurement complements a previous BESIII measurement of ψ(3686)→γη<inf>c</inf>(2S) with η<inf>c</inf>(2S)→KS0K<sup>±</sup>π<sup>+</sup> and K <sup>+</sup>K<sup>-</sup>π0.