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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2010, vol. 105, p. -

First measurement of inclusive B→Xsη decays

Nishimura K., Browder T. E., Adachi I., Aihara H., Arinstein K., Aushev T., Bakich A. M., Balagura V., Barberio E., Belous K., Bhardwaj V., Bischofberger M., Bondar A., Bozek A., Bračko M., Chang M. C., Chao Y., Chen A., Chen K. F., Chen P., Cheon B. G., Chiang C. C., Cho I. S., Choi Y., Dalseno J., Danilov M., Dolex̌al Z., Drutskoy A., Eidelman S., Gabyshev N., Golob B., Ha H., Haba J., Hara T., Hayasaka K., Hayashii H., Horii Y., Hoshi Y., Hou W. S., Hyun H. J., Iijima T., Inami K., Itoh R., Iwabuchi M., Iwasaki Y., Joshi N. J., Julius T., Kang J. H., Kapusta P., Kawai H., Kawasaki T., Kichimi H., Kiesling C., Kim H. J., Kim H. O., Kim M. J., Kim Y. J., Kinoshita K., Ko B. R., Kodyš P., Korpar S., Krix̌an P., Kumita T., Kuzmin A., Kwon Y. J., Kyeong S. H., Lange J. S., Lee M. J., Lee S. H., Li J., Liu C., Liu Y., Liventsev D., Louvot R., Matyja A., McOnie S., Miyabayashi K., Miyata H., Miyazaki Y., Mohanty G. B., Mori T., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Ogawa S., Ohshima T., Olsen S. L.

We report a first measurement of inclusive B→Xsη decays, where Xs is a charmless state with unit strangeness. The measurement is based on a pseudoinclusive reconstruction technique and uses a sample of 657×106BB̄ pairs accumulated with the Belle detector at the KEKB e⊃+e⊃- collider. For MXs<2.6GeV/c2, we measure a branching fraction of [26.1±3.0(stat)-2.1+1.9(syst)-7.1+4. 0(model)]×10-5 and a direct CP asymmetry of AC P=-0.13±0.04-0.03+0.02. Over half of the signal occurs in the range MXs>1.8GeV/c2. © 2010 The American Physical Society.