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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2005, vol. 72, p. 1-5

Search for the b→dγ process

Mohapatra D., Nakao M., Yabsley B. D., Abe K., Abe K., Aihara H., Arinstein K., Asano Y., Aushev T., Aziz T., Bahinipati S., Bakich A. M., Barberio E., Barbero M., Bedny I., Bitenc U., Bizjak I., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chao Y., Chen A., Chen W. T., Cheon B. G., Chistov R., Choi S. K., Choi Y., Chuvikov A., Dalseno J., Danilov M., Dash M., Dragic J., Eidelman S., Gershon T., Gokhroo G., Golob B., Gorišek A., Hara T., Hayasaka K., Hazumi M., Hinz L., Hokuue T., Hoshi Y., Hou S., Hou W. S., Hsiung Y. B., Iijima T., Ikado K., Imoto A., Inami K., Ishikawa A., Iwasaki M., Iwasaki Y., Kang J. H., Kang J. S., Kawai H., Kawasaki T., Khan H. R., Kim H. J., Kim S. M., Kinoshita K., Križan P., Krokovny P., Kulasiri R., Kuo C. C., Kuzmin A., Kwon Y. J., Leder G., Lee S. E., Lesiak T., Li J., Limosani A., Lin S. W., Liventsev D., Majumder G., Mandl F., Matyja A., Mikami Y., Mitaroff W., Miyata H., Moloney G. R., Nagamine T., Nagasaka Y., Nakano E., Nakazawa H., Nishida S., Nitoh O., Nozaki T., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Onuki Y.

We report the results of a search for the flavor-changing neutral current process b→dγ using a sample of 275×106 B meson pairs accumulated by the Belle detector at KEKB. We find no significant signal for the exclusive decays B-→ρ-γ, B̄0→ρ0γ, or B̄0→ωγ. Assuming an isospin relation between the three modes, we set an upper limit for the combined branching fraction B(B→(ρ,ω)γ), of 1.4×10-6 at the 90% confidence level. This limit can be used to constrain the ratio of CKM matrix elements |Vtd/Vts|. © 2005 The American Physical Society.