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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2006, vol. 97, p. -

Evidence for B→η′π and improved measurements for B→η′K

Schümann J., Wang C. H., Abe K., Adachi I., Aihara H., Anipko D., Arinstein K., Asano Y., Aushev T., Bakich A. M., Balagura V., Barberio E., Barbero M., Bay A., Bedny I., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Browder T. E., Chang M. C., Chang P., Chao Y., Chen A., Chen W. T., Cheon B. G., Choi Y., Choi Y. K., Chuvikov A., Cole S., Dalseno J., Danilov M., Dash M., Dragic J., Drutskoy A., Eidelman S., Epifanov D., Fratina S., Gabyshev N., Gershon T., Go A., Gokhroo G., Golob B., Gorišek A., Ha H. C., Haba J., Hara T., Hastings N. C., Hayasaka K., Hayashii H., Hazumi M., Hinz L., Hokuue T., Hoshi Y., Hou S., Hou W. S., Hsiung Y. B., Iijima T., Imoto A., Inami K., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Kang J. H., Kapusta P., Katayama N., Kawai H., Kawasaki T., Khan H. R., Kichimi H., Kim S. K., Kim S. M., Kinoshita K., Kulasiri R., Kumar R., Kuo C. C., Kuzmin A., Kwon Y. J., Lange J. S., Lee J., Lesiak T., Limosani A., Liventsev D., MacNaughton J., Majumder G., Mandl F., Marlow D., Matsumoto T., Matyja A., Mitaroff W., Miyake H., Miyata H., Miyazaki Y., Mizuk R.

We report evidence for the exclusive two-body charmless hadronic B meson decay B→η′π, and improved measurements of B→η′ K. The results are obtained from a data sample of 386×106 BB̄ pairs collected at the Υ(4S) resonance, with the Belle detector at the KEKB asymmetric-energy e+e- collider. We measure B(B+→η′π+)=[1.76- 0.62+0.67(stat)-0.14+0.15(syst)]×10-6 and B(B0→η′π0)=[2. 79-0.96+1.02(stat)-0.34+0.25(syst)]×10-6. We also find the ratio of B(B+→η′K+)B(B0→η′K0)=1.17±0.08(stat) ±0.03(syst) and measure the direct CP asymmetries for the charged modes. © 2006 The American Physical Society.