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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2015, vol. 114, 15, p. -

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

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., Bobrov A., Bondar A., Bonvicini G., Bozek A., Bračko M., Browder T. E., Červenkov D., Chekelian V., Chen A., Cheon B. G., Chilikin K., Chistov R., Cho K., Chobanova V., Choi Y., Cinabro D., Dalseno J., DoleŽal Z., Drásal Z., Drutskoy A., Dutta D., Eidelman S., Farhat H., Fast J. E., Ferber T., Frost O., Gaur V., Gabyshev N., Ganguly S., Garmash A., Getzkow D., Gillard R., Goh Y. M., Golob B., Haba J., Hasenbusch J., Hayashii H., He X. H., Heller A., Horiguchi T., Hou W. S., Huschle M., Iijima T., Inami K., Ishikawa A., Itoh R., Iwasaki Y., Jaegle I., Joffe D., Julius T., Kang K. H., Kato E., Kawasaki T., Kiesling C., Kim D. Y., Kim J. B., Kim J. H., Kim K. T., Kim M. J., Kim S. H., Kim Y. J., Ko B. R., Kodyš P., Korpar S., KriŽan P., Krokovny P., Kronenbitter B., Kuhr T., Kumita T.

© 2015 American Physical Society. 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.