First measurement of inclusive B→Xsη decays

K. Nishimura, T. E. Browder, I. Adachi, H. Aihara, K. Arinstein, T. Aushev, A. M. Bakich, V. Balagura, E. Barberio, K. Belous, V. Bhardwaj, M. Bischofberger, A. Bondar, A. Bozek, M. Bračko, M. C. Chang, Y. Chao, A. Chen, K. F. Chen, P. ChenB. G. Cheon, C. C. Chiang, I. S. Cho, Y. Choi, J. Dalseno, M. Danilov, Z. Dolex̌al, A. Drutskoy, S. Eidelman, N. Gabyshev, B. Golob, H. Ha, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, Y. Horii, Y. Hoshi, W. S. Hou, H. J. Hyun, T. Iijima, K. Inami, R. Itoh, M. Iwabuchi, Y. Iwasaki, N. J. Joshi, T. Julius, J. H. Kang, P. Kapusta, H. Kawai, T. Kawasaki, H. Kichimi, C. Kiesling, H. J. Kim, H. O. Kim, M. J. Kim, Y. J. Kim, K. Kinoshita, B. R. Ko, P. Kodyš, S. Korpar, P. Krix̌an, T. Kumita, A. Kuzmin, Y. J. Kwon, S. H. Kyeong, J. S. Lange, M. J. Lee, S. H. Lee, J. Li, C. Liu, Y. Liu, D. Liventsev, R. Louvot, A. Matyja, S. McOnie, K. Miyabayashi, H. Miyata, Y. Miyazaki, G. B. Mohanty, T. Mori, E. Nakano, M. Nakao, H. Nakazawa, Z. Natkaniec, S. Nishida, S. Ogawa, T. Ohshima, S. L. Olsen, W. Ostrowicz, G. Pakhlova, C. W. Park, H. Park, H. K. Park, K. S. Park, R. Pestotnik, M. Petrič, L. E. Piilonen, M. Röhrken, S. Ryu, H. Sahoo, Y. Sakai, O. Schneider, C. Schwanda, A. J. Schwartz, K. Senyo, O. Seon, M. E. Sevior, M. Shapkin, C. P. Shen, J. G. Shiu, F. Simon, P. Smerkol, A. Sokolov, E. Solovieva, M. Starič, T. Sumiyoshi, S. Suzuki, Y. Teramoto, K. Trabelsi, S. Uehara, T. Uglov, Y. Unno, S. Uno, G. Varner, K. E. Varvell, K. Vervink, C. H. Wang, M. Z. Wang, P. Wang, Y. Watanabe, J. Wicht, K. M. Williams, Eunil Won, Y. Yamashita, M. Yamauchi, C. C. Zhang, Z. P. Zhang, P. Zhou, V. Zhulanov, T. Zivko, A. Zupanc, O. Zyukova

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Abstract

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.

Original languageEnglish
Article number191803
JournalPhysical Review Letters
Volume105
Issue number19
DOIs
Publication statusPublished - 2010 Nov 5

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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., ... Zyukova, O. (2010). First measurement of inclusive B→Xsη decays. Physical Review Letters, 105(19), [191803]. https://doi.org/10.1103/PhysRevLett.105.191803