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 Chen; B G Cheon; C-C Chiang; I-S Cho; Y Choi; J Dalseno; M Danilov; Z Doležal; 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 Križan; 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; E Won; Y Yamashita; M Yamauchi; C C Zhang; Z P Zhang; P Zhou; V Zhulanov; T Zivko; A Zupanc; O Zyukova; Belle Collaboration

doi:10.1103/PhysRevLett.105.191803

First measurement of inclusive B→Xsη decays

Phys Rev Lett. 2010 Nov 5;105(19):191803. doi: 10.1103/PhysRevLett.105.191803. Epub 2010 Nov 5.

Authors

K Nishimura¹, 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 Chen, B G Cheon, C-C Chiang, I-S Cho, Y Choi, J Dalseno, M Danilov, Z Doležal, 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 Križan, 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, E Won, Y Yamashita, M Yamauchi, C C Zhang, Z P Zhang, P Zhou, V Zhulanov, T Zivko, A Zupanc, O Zyukova; Belle Collaboration

Affiliation

¹ University of Hawaii, Honolulu, Hawaii 96822, USA.

PMID: 21231162
DOI: 10.1103/PhysRevLett.105.191803

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 657×10(6)BB pairs accumulated with the Belle detector at the KEKB e+e- collider. For MXs < 2.6 GeV/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 ACP=-0.13±0.04-0.03+0.02. Over half of the signal occurs in the range MXs > 1.8 GeV/c2.