Inclusive measurement of the photon energy spectrum in b --> sgamma decays

P Koppenburg; K Abe; K Abe; T Abe; I Adachi; H Aihara; M Akatsu; Y Asano; V Aulchenko; T Aushev; A M Bakich; Y Ban; A Bay; U Bitenc; I Bizjak; A Bondar; A Bozek; M Bracko; T E Browder; P Chang; Y Chao; K-F Chen; B G Cheon; Y Choi; A Chuvikov; S Cole; M Danilov; M Dash; L Y Dong; A Drutskoy; S Eidelman; V Eiges; Y Enari; F Fang; S Fratina; N Gabyshev; A Garmash; T Gershon; G Gokhroo; B Golob; J Haba; H Hayashii; M Hazumi; T Higuchi; L Hinz; T Hokuue; Y Hoshi; W-S Hou; Y B Hsiung; T Iijima; K Inami; A Ishikawa; R Itoh; H Iwasaki; M Iwasaki; J H Kang; J S Kang; N Katayama; H Kawai; T Kawasaki; H Kichimi; H J Kim; J H Kim; S K Kim; T H Kim; S Korpar; P Krizan; P Krokovny; S Kumar; A Kuzmin; Y-J Kwon; J S Lange; G Leder; S H Lee; T Lesiak; J Li; A Limosani; S-W Lin; J MacNaughton; G Majumder; F Mandl; T Matsumoto; Y Mikami; W Mitaroff; K Miyabayashi; H Miyake; H Miyata; D Mohapatra; G R Moloney; T Mori; T Nagamine; Y Nagasaka; T Nakadaira; E Nakano; M Nakao; Z Natkaniec; K Neichi; S Nishida; O Nitoh; T Nozaki; S Ogawa; T Ohshima; T Okabe; S Okuno; S L Olsen; W Ostrowicz; H Ozaki; P Pakhlov; H Palka; C W Park; H Park; N Parslow; L S Peak; L E Piilonen; F J Ronga; M Rozanska; H Sagawa; S Saitoh; Y Sakai; T R Sarangi; O Schneider; C Schwanda; A J Schwartz; S Semenov; K Senyo; R Seuster; M E Sevior; H Shibuya; N Soni; R Stamen; S Stanic; M Staric; T Sumiyoshi; S Suzuki; O Tajima; F Takasaki; N Tamura; M Tanaka; G N Taylor; T Tomura; K Trabelsi; T Tsuboyama; T Tsukamoto; S Uehara; T Uglov; K Ueno; S Uno; Y Ushiroda; G Varner; K E Varvell; C C Wang; C H Wang; M Watanabe; B D Yabsley; Y Yamada; A Yamaguchi; Y Yamashita; M Yamauchi; H Yanai; Heyoung Yang; J Ying; Y Yusa; C C Zhang; Z P Zhang; T Ziegler; D Zontar; Belle Collaboration

doi:10.1103/PhysRevLett.93.061803

Inclusive measurement of the photon energy spectrum in b --> sgamma decays

Phys Rev Lett. 2004 Aug 6;93(6):061803. doi: 10.1103/PhysRevLett.93.061803. Epub 2004 Aug 6.

Authors

P Koppenburg¹, K Abe, K Abe, T Abe, I Adachi, H Aihara, M Akatsu, Y Asano, V Aulchenko, T Aushev, A M Bakich, Y Ban, A Bay, U Bitenc, I Bizjak, A Bondar, A Bozek, M Bracko, T E Browder, P Chang, Y Chao, K-F Chen, B G Cheon, Y Choi, A Chuvikov, S Cole, M Danilov, M Dash, L Y Dong, A Drutskoy, S Eidelman, V Eiges, Y Enari, F Fang, S Fratina, N Gabyshev, A Garmash, T Gershon, G Gokhroo, B Golob, J Haba, H Hayashii, M Hazumi, T Higuchi, L Hinz, T Hokuue, Y Hoshi, W-S Hou, Y B Hsiung, T Iijima, K Inami, A Ishikawa, R Itoh, H Iwasaki, M Iwasaki, J H Kang, J S Kang, N Katayama, H Kawai, T Kawasaki, H Kichimi, H J Kim, J H Kim, S K Kim, T H Kim, S Korpar, P Krizan, P Krokovny, S Kumar, A Kuzmin, Y-J Kwon, J S Lange, G Leder, S H Lee, T Lesiak, J Li, A Limosani, S-W Lin, J MacNaughton, G Majumder, F Mandl, T Matsumoto, Y Mikami, W Mitaroff, K Miyabayashi, H Miyake, H Miyata, D Mohapatra, G R Moloney, T Mori, T Nagamine, Y Nagasaka, T Nakadaira, E Nakano, M Nakao, Z Natkaniec, K Neichi, S Nishida, O Nitoh, T Nozaki, S Ogawa, T Ohshima, T Okabe, S Okuno, S L Olsen, W Ostrowicz, H Ozaki, P Pakhlov, H Palka, C W Park, H Park, N Parslow, L S Peak, L E Piilonen, F J Ronga, M Rozanska, H Sagawa, S Saitoh, Y Sakai, T R Sarangi, O Schneider, C Schwanda, A J Schwartz, S Semenov, K Senyo, R Seuster, M E Sevior, H Shibuya, N Soni, R Stamen, S Stanic, M Staric, T Sumiyoshi, S Suzuki, O Tajima, F Takasaki, N Tamura, M Tanaka, G N Taylor, T Tomura, K Trabelsi, T Tsuboyama, T Tsukamoto, S Uehara, T Uglov, K Ueno, S Uno, Y Ushiroda, G Varner, K E Varvell, C C Wang, C H Wang, M Watanabe, B D Yabsley, Y Yamada, A Yamaguchi, Y Yamashita, M Yamauchi, H Yanai, Heyoung Yang, J Ying, Y Yusa, C C Zhang, Z P Zhang, T Ziegler, D Zontar; Belle Collaboration

Affiliation

¹ High Energy Accelerator Research Organization (KEK), Tsukuba, Japan.

PMID: 15323621
DOI: 10.1103/PhysRevLett.93.061803

Abstract

We report a fully inclusive measurement of the flavor changing neutral current decay b --> sgamma in the energy range 1.8 GeV < or = E*gamma < or = 2.8 GeV, covering 95% of the total spectrum. Using 140 fb(-1), we obtain B(b --> sgamma) = (3.55+/-0.32(+0.30+0.11)(-0.31-0.07)) x 10(-4), where the errors are statistical, systematic, and from theory corrections. We also measure the first and second moments of the photon energy spectrum above 1.8 GeV and obtain (Egamma) = 2.292+/-0.026+/-0.034 GeV and (E2gamma) - (Egamma)2 = 0.0305+/-0.0074+/-0.0063 GeV2, where the errors are statistical and systematic.