Measurement of the direct CP asymmetry in B ¯ →xs+dγ decays with a lepton tag

L. Pesántez, P. Urquijo, J. Dingfelder, A. Abdesselam, I. Adachi, K. Adamczyk, H. Aihara, S. Al Said, K. Arinstein, D. M. Asner, V. Aulchenko, T. Aushev, R. Ayad, S. Bahinipati, A. M. Bakich, V. Bansal, E. Barberio, V. Bhardwaj, B. Bhuyan, A. BobrovA. Bondar, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, R. Chistov, K. Cho, V. Chobanova, Y. Choi, D. Cinabro, J. Dalseno, Z. DoleŽal, Z. Drásal, A. Drutskoy, D. Dutta, S. Eidelman, H. Farhat, J. E. Fast, T. Ferber, O. Frost, V. Gaur, N. Gabyshev, S. Ganguly, A. Garmash, D. Getzkow, R. Gillard, Y. M. Goh, B. Golob, J. Haba, J. Hasenbusch, H. Hayashii, X. H. He, A. Heller, T. Horiguchi, W. S. Hou, M. Huschle, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, Y. Iwasaki, I. Jaegle, D. Joffe, T. Julius, K. H. Kang, E. Kato, T. Kawasaki, C. Kiesling, D. Y. Kim, J. B. Kim, J. H. Kim, K. T. Kim, M. J. Kim, S. H. Kim, Y. J. Kim, B. R. Ko, P. Kodyš, S. Korpar, P. KriŽan, P. Krokovny, B. Kronenbitter, T. Kuhr, T. Kumita, A. Kuzmin, Y. J. Kwon, J. S. Lange, I. S. Lee, Y. Li, L. Li Gioi, J. Libby, D. Liventsev, P. Lukin, D. Matvienko, K. Miyabayashi, H. Miyata, R. Mizuk, G. B. Mohanty, A. Moll, H. K. Moon, E. Nakano, M. Nakao, T. Nanut, Z. Natkaniec, M. Nayak, C. Ng, N. K. Nisar, S. Nishida, S. Ogawa, S. Okuno, S. L. Olsen, C. Oswald, P. Pakhlov, G. Pakhlova, C. W. Park, H. Park, T. K. Pedlar, R. Pestotnik, M. Petrič, L. E. Piilonen, E. RibeŽl, M. Ritter, A. Rostomyan, M. Rozanska, Y. Sakai, S. Sandilya, L. Santelj, T. Sanuki, Y. Sato, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, A. J. Schwartz, K. Senyo, O. Seon, M. E. Sevior, V. Shebalin, C. P. Shen, T. A. Shibata, J. G. Shiu, B. Shwartz, A. Sibidanov, F. Simon, Y. S. Sohn, A. Sokolov, E. Solovieva, M. Starič, M. Steder, T. Sumiyoshi, U. Tamponi, N. Taniguchi, G. Tatishvili, Y. Teramoto, K. Trabelsi, M. Uchida, T. Uglov, Y. Unno, S. Uno, Y. Usov, C. Van Hulse, P. Vanhoefer, G. Varner, A. Vinokurova, V. Vorobyev, M. N. Wagner, B. Wang, C. H. Wang, M. Z. Wang, P. Wang, Y. Watanabe, K. M. Williams, E. Won, J. Yamaoka, S. Yashchenko, Y. Yook, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc

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Abstract

We report the measurement of the direct CP asymmetry in the radiative B¯→Xs+dγ decay using a data sample of (772±11)×106 BB¯ pairs collected at the (4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. The CP asymmetry is measured as a function of the photon energy threshold. For Eγ∗≥2.1GeV, where Eγ∗ is the photon energy in the center-of-mass frame, we obtain ACP(B¯→Xs+dγ)=(2.2±3.9±0.9)%, consistent with the standard model prediction.

Original languageEnglish
Article number151601
JournalPhysical review letters
Volume114
Issue number15
DOIs
Publication statusPublished - 2015 Apr 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Pesántez, L., Urquijo, P., Dingfelder, J., Abdesselam, A., Adachi, I., Adamczyk, K., Aihara, H., Al Said, S., Arinstein, K., Asner, D. M., Aulchenko, V., Aushev, T., Ayad, R., Bahinipati, S., Bakich, A. M., Bansal, V., Barberio, E., Bhardwaj, V., Bhuyan, B., ... Zupanc, A. (2015). Measurement of the direct CP asymmetry in B ¯ →xs+dγ decays with a lepton tag. Physical review letters, 114(15), [151601]. https://doi.org/10.1103/PhysRevLett.114.151601