First Measurement of Inclusive B -> X_s eta Decays
High Energy Physics - Experiment
2010-11-11 v2
Abstract
We report a first measurement of inclusive B -> X_s eta decays, where X_s is a charmless state with unit strangeness. The measurement is based on a pseudo-inclusive reconstruction technique and uses a sample of 657 x 10^6 BB-bar pairs accumulated with the Belle detector at the KEKB e^+e^- collider. For M_{X_s} < 2.6 GeV/c^2, we measure a branching fraction of (26.1 +/- 3.0 (stat) +1.9 -2.1 (syst) +4.0 -7.1 (model)) x 10^-5 and a direct CP asymmetry of A_{CP} = -0.13 +/- 0.04 +0.02 -0.03. Over half of the signal occurs in the range M_{X_s} > 1.8 GeV/c^2.
Keywords
Cite
@article{arxiv.0910.4751,
title = {First Measurement of Inclusive B -> X_s eta Decays},
author = {Belle Collaboration and K. Nishimura and T. E. Browder and I. Adachi and H. Aihara and K. Arinstein and T. Aushev and A. M. Bakich and V. Balagura and E. Barberio and K. Belous and V. Bhardwaj and M. Bischofberger and A. Bondar and A. Bozek and M. Bracko and M. -C. Chang and Y. Chao and A. Chen and K. -F. Chen and P. Chen and B. G. Cheon and C. -C. Chiang and I. -S. Cho and Y. Choi and J. Dalseno and M. Danilov and Z. Dolezal and A. Drutskoy and S. Eidelman and N. Gabyshev and B. Golob and H. Ha and J. Haba and T. Hara and K. Hayasaka and H. Hayashii and Y. Horii and Y. Hoshi and W. -S. Hou and H. J. Hyun and T. Iijima and K. Inami and R. Itoh and M. Iwabuchi and Y. Iwasaki and N. J. Joshi and T. Julius and J. H. Kang and P. Kapusta and H. Kawai and T. Kawasaki and H. Kichimi and C. Kiesling and H. J. Kim and H. O. Kim and M. J. Kim and Y. J. Kim and K. Kinoshita and B. R. Ko and P. Kodys and S. Korpar and P. Krizan and T. Kumita and A. Kuzmin and Y. -J. Kwon and S. -H. Kyeong and J. S. Lange and M. J. Lee and S. -H. Lee and J. Li and C. Liu and Y. Liu and D. Liventsev and R. Louvot and A. Matyja and S. McOnie and K. Miyabayashi and H. Miyata and Y. Miyazaki and G. B. Mohanty and T. Mori and E. Nakano and M. Nakao and Z. Natkaniec and S. Nishida and S. Ogawa and T. Ohshima and S. L. Olsen and W. Ostrowicz and G. Pakhlova and C. W. Park and H. Park and H. K. Park and K. S. Park and R. Pestotnik and M. Petric and L. E. Piilonen and M. Rohrken and S. Ryu and H. Sahoo and Y. Sakai and O. Schneider and C. Schwanda and A. J. Schwartz and K. Senyo and O. Seon and M. E. Sevior and M. Shapkin and C. P. Shen and J. -G. Shiu and F. Simon and P. Smerkol and A. Sokolov and E. Solovieva and M. Staric and T. Sumiyoshi and S. Suzuki and Y. Teramoto and K. Trabelsi and S. Uehara and T. Uglov and Y. Unno and S. Uno and G. Varner and K. E. Varvell and K. Vervink and C. H. Wang and M. -Z. Wang and P. Wang and Y. Watanabe and J. Wicht and K. M. Williams and E. Won and Y. Yamashita and M. Yamauchi and C. C. Zhang and Z. P. Zhang and P. Zhou and V. Zhulanov and T. Zivko and A. Zupanc and O. Zyukova},
journal= {arXiv preprint arXiv:0910.4751},
year = {2010}
}
Comments
6 pages, 1 figure, 1 table, submitted to Physical Review Letters