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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2004, vol. 93, p. 031803-1

Measurement of the CP asymmetry in B → Xsγ

Nishida S., Abe K., Abe K., Abe T., Aihara H., Asano Y., Aushev T., Bahinipati S., Bakich A. M., Ban Y., Banas E., Bay A., Bitenc U., Bizjak I., Blyth S., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang M. C., Chang P., Chen K. F., Cheon B. G., Chistov R., Choi S. K., Choi Y., Chuvikov A., Cole S., Danilov M., Dash M., Dong L. Y., Dragic J., Eidelman S., Eiges V., Enari Y., Epifanov D., Fang F., Fratina S., Garmash A., Gershon T., Gokhroo G., Golob B., Haba J., Hara T., Hastings N. C., Hayashii H., Hazumi M., Higuchi T., Hinz L., Hoshi Y., Hou W. S., Hsiung Y. B., Iijima T., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Kang J. H., Kang J. S., Kapusta P., Kataoka S. U., Katayama N., Kawasaki T., Kichimi H., Kim H. J., Kim S. K., Kim T. H., Koppenburg P., Korpar S., Križan P., Krokovny P., Kuzmin A., Kwon Y. J., Lange J. S., Leder G., Lee S. E., Lee S. H., Li J., Lin S. W., MacNaughton J., Majumder G., Mandl F., Matsumoto T., Matyja A., Mitaroff W., Miyake H., Mizuk R., Mohapatra D., Moloney G. R., Murakami A., Nagamine T., Nagasaka Y.

The CP asymmetry in the B → Xsγ, where hadronic recoil system Xs is reconstructed, was investigated using pseudoreconstruction technique. Negligible contamination from b → dγ decays was observed, which were expected to have larger CP asymmetry. The qq̄ and BB̄ distributions were obtained from off-resonance data and Monte Carlo (MC) simulation. The results show that 50% error is assigned to Gaussian width and to ratio of the Gaussian and ARGUS function for rare B decays.