Вы находитесь на старом сайте НГУ. Перейти на новый сайт

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

Search for η and η′→π+ <sup>e-</sup>ν<inf>̄e</inf>+c.c. decays in J/ψ→φη and φη′

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., Guler N. G., 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.

© 2013 American Physical Society. Using a sample of 225.3 million J/ψ events collected with the BESIII detector at the BEPCII e<sup>+</sup>e<sup>-</sup> collider in 2009, searches for the decays of η and η′→π<sup>+</sup>e <sup>-</sup>ν<inf>̄e</inf>+c.c. in J/ψ→φη and φη′ are performed. The φ signals, which are reconstructed in K<sup>+</sup>K<sup>-</sup> final states, are used to tag η and η′ semileptonic decays. No signals are observed for either η or η′, and upper limits at the 90% confidence level are determined to be 7.3×10<sup>-</sup>4 and 5.0×10<sup>-</sup>4 for the ratios B(η→π<sup>+</sup>e<sup>-</sup>ν<inf>̄e</inf>+c.c.) B(η→π<sup>+</sup>π<sup>-</sup>π0) and B(η′→π <sup>+</sup>e<sup>-</sup>ν<inf>̄e</inf>+c.c.) B(η′→π<sup>+</sup>π<sup>-</sup>η), respectively. These are the first upper-limit values determined for η and η′ semileptonic weak decays.