Observation of b-->dgamma and determination of /Vtd/Vts/

D Mohapatra; M Nakao; S Nishida; K Abe; K Abe; I Adachi; H Aihara; D Anipko; K Arinstein; Y Asano; V Aulchenko; T Aushev; S Bahinipati; A M Bakich; V Balagura; M Barbero; I Bedny; U Bitenc; I Bizjak; S Blyth; A Bondar; A Bozek; M Bracko; T E Browder; Y Chao; A Chen; K-F Chen; W T Chen; B G Cheon; R Chistov; Y Choi; A Chuvikov; S Cole; J Dalseno; M Danilov; M Dash; J Dragic; A Drutskoy; S Eidelman; D Epifanov; S Fratina; N Gabyshev; T Gershon; G Gokhroo; B Golob; A Gorisek; H C Ha; J Haba; T Hara; N C Hastings; K Hayasaka; H Hayashii; M Hazumi; L Hinz; T Hokuue; Y Hoshi; S Hou; W-S Hou; Y B Hsiung; T Iijima; A Imoto; K Inami; A Ishikawa; H Ishino; R Itoh; M Iwasaki; Y Iwasaki; J H Kang; S U Kataoka; N Katayama; T Kawasaki; H R Khan; H Kichimi; H J Kim; H O Kim; S M Kim; K Kinoshita; S Korpar; P Krizan; P Krokovny; R Kulasiri; R Kumar; C C Kuo; A Kuzmin; Y-J Kwon; J S Lange; G Leder; J Lee; T Lesiak; A Limosani; S-W Lin; D Liventsev; G Majumder; F Mandl; D Marlow; T Matsumoto; A Matyja; W Mitaroff; K Miyabayashi; H Miyake; H Miyata; Y Miyazaki; R Mizuk; G R Moloney; T Mori; E Nakano; O Nitoh; T Nozaki; S Ogawa; T Ohshima; T Okabe; S Okuno; S L Olsen; H Ozaki; P Pakhlov; H Palka; C W Park; N Parslow; L S Peak; R Pestotnik; L E Piilonen; A Poluektov; F J Ronga; M Rozanska; Y Sakai; T R Sarangi; N Sato; T Schietinger; O Schneider; J Schümann; C Schwanda; A J Schwartz; R Seidl; M E Sevior; M Shapkin; H Shibuya; B Shwartz; V Sidorov; A Sokolov; A Somov; N Soni; R Stamen; S Stanic; M Staric; T Sumiyoshi; S Suzuki; O Tajima; F Takasaki; K Tamai; N Tamura; M Tanaka; G N Taylor; Y Teramoto; X C Tian; K Trabelsi; T Tsukamoto; S Uehara; T Uglov; K Ueno; Y Unno; S Uno; P Urquijo; Y Usov; G Varner; K E Varvell; S Villa; C C Wang; C H Wang; M-Z Wang; Y Watanabe; J Wicht; E Won; Q L Xie; B D Yabsley; A Yamaguchi; Y Yamashita; M Yamauchi; J Ying; Y Yusa; L M Zhang; Z P Zhang; V Zhilich; D Zürcher; Belle Collaboration

doi:10.1103/PhysRevLett.96.221601

Observation of b-->dgamma and determination of /Vtd/Vts/

Phys Rev Lett. 2006 Jun 9;96(22):221601. doi: 10.1103/PhysRevLett.96.221601. Epub 2006 Jun 9.

Authors

D Mohapatra¹, M Nakao, S Nishida, K Abe, K Abe, I Adachi, H Aihara, D Anipko, K Arinstein, Y Asano, V Aulchenko, T Aushev, S Bahinipati, A M Bakich, V Balagura, M Barbero, I Bedny, U Bitenc, I Bizjak, S Blyth, A Bondar, A Bozek, M Bracko, T E Browder, Y Chao, A Chen, K-F Chen, W T Chen, B G Cheon, R Chistov, Y Choi, A Chuvikov, S Cole, J Dalseno, M Danilov, M Dash, J Dragic, A Drutskoy, S Eidelman, D Epifanov, S Fratina, N Gabyshev, T Gershon, G Gokhroo, B Golob, A Gorisek, H C Ha, J Haba, T Hara, N C Hastings, K Hayasaka, H Hayashii, M Hazumi, L Hinz, T Hokuue, Y Hoshi, S Hou, W-S Hou, Y B Hsiung, T Iijima, A Imoto, K Inami, A Ishikawa, H Ishino, R Itoh, M Iwasaki, Y Iwasaki, J H Kang, S U Kataoka, N Katayama, T Kawasaki, H R Khan, H Kichimi, H J Kim, H O Kim, S M Kim, K Kinoshita, S Korpar, P Krizan, P Krokovny, R Kulasiri, R Kumar, C C Kuo, A Kuzmin, Y-J Kwon, J S Lange, G Leder, J Lee, T Lesiak, A Limosani, S-W Lin, D Liventsev, G Majumder, F Mandl, D Marlow, T Matsumoto, A Matyja, W Mitaroff, K Miyabayashi, H Miyake, H Miyata, Y Miyazaki, R Mizuk, G R Moloney, T Mori, E Nakano, O Nitoh, T Nozaki, S Ogawa, T Ohshima, T Okabe, S Okuno, S L Olsen, H Ozaki, P Pakhlov, H Palka, C W Park, N Parslow, L S Peak, R Pestotnik, L E Piilonen, A Poluektov, F J Ronga, M Rozanska, Y Sakai, T R Sarangi, N Sato, T Schietinger, O Schneider, J Schümann, C Schwanda, A J Schwartz, R Seidl, M E Sevior, M Shapkin, H Shibuya, B Shwartz, V Sidorov, A Sokolov, A Somov, N Soni, R Stamen, S Stanic, M Staric, T Sumiyoshi, S Suzuki, O Tajima, F Takasaki, K Tamai, N Tamura, M Tanaka, G N Taylor, Y Teramoto, X C Tian, K Trabelsi, T Tsukamoto, S Uehara, T Uglov, K Ueno, Y Unno, S Uno, P Urquijo, Y Usov, G Varner, K E Varvell, S Villa, C C Wang, C H Wang, M-Z Wang, Y Watanabe, J Wicht, E Won, Q L Xie, B D Yabsley, A Yamaguchi, Y Yamashita, M Yamauchi, J Ying, Y Yusa, L M Zhang, Z P Zhang, V Zhilich, D Zürcher; Belle Collaboration

Affiliation

¹ Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA.

PMID: 16803300
DOI: 10.1103/PhysRevLett.96.221601

Abstract

We report the observation of the flavor-changing neutral current process b-->dgamma using a sample of 386 x 106 B meson pairs accumulated by the Belle detector at the KEKB e+e- collider. We measure branching fractions for the exclusive modes B--->rho-gamma, B0rho0gamma, and B0omegagamma. Assuming that these three modes are related by isospin, we find B(B-->(rho,gamma)gamma)=[Formula: See Text] with a significance of 5.1sigma. This result is used to determine the ratio of Cabibbo-Kobayashi-Maskawa matrix elements /Vtd/Vts/ to be [Formula: See Text].