Inclusive measurement of the photon energy spectrum in b → sγ decays

Patrick Koppenburg,Kazuo Abe, T. Abe,I. Adachi,Hiroaki Aihara,M. Akatsu,Y. Asano, V. M. Aulchenko,T. Aushev, A. M. Bakich,Y. Ban, A. Bay, U. Bitenc,I. Bizjak,A. Bondar, A. Bozek, M. Bračko,T. E. Browder,P. Chang,Y. Chao,K. F. Chen,Byung Gu Cheon,Y. Choi, A. Chuvikov,S. Cole, M. Danilov,M. Dash,L. Y. Dong, A. Drutskoy,S. Eidelman, V. Eiges,Yuji Enari, F. Fang, S. Fratina, N. Gabyshev, A. Garmash, T. J. Gershon,G. Gokhroo, B. Golob,J. Haba,H. Hayashii,Masashi Hazumi,Takuya Higuchi, L. Hinz, T. Hokuue,Y. Hoshi,W. S. Hou,Y. B. Hsiung,T. Iijima, K. Inami,A. Ishikawa, R. Itoh,Hiroyuki Iwasaki,M. Iwasaki,J. H. Kang,J. S. Kang,N. Katayama, H. Kawai, T. Kawasaki,H. Kichimi,H. J. Kim,Jung-Hyun Kim,Seong Keun Kim, T.H. Kim,S. Korpar,P. Križan,P. Krokovny,Suneel Kumar,A.S. Kuzmin,Y. J. Kwon,J. S. Lange,G. Leder,S. H. Lee,T. Lesiak,J. Li,Antonio Limosani,S. W. Lin,J. MacNaughton,Gobinda Majumder,F. Mandl,T. Matsumoto,Y. Mikami,W. A. Mitaroff, K. Miyabayashi,H. Miyake,H. Miyata, D. Mohapatra,G. R. Moloney,Takehiko Mori,T. Nagamine, Yasushi 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,Frederic Jean Ronga,M. Rozanska,Hiroyuki Sagawa,S. Saitoh,Y. Sakai, T. R. Sarangi,O. Schneider, C. Schwanda,A. J. Schwartz, S. Semenov,K. Senyo,Rolf Seuster,M. E. Sevior,H. Shibuya,N. Soni,Rainer Stamen, S. Stanič, M. Starič,T. Sumiyoshi,S. Y. Suzuki,Osamu Tajima,F. Takasaki,N. Tamura,M. H. Tanaka,G. N. Taylor,T. Tomura,K. Trabelsi,T. Tsuboyama,T. Tsukamoto, S. Uehara,T. Uglov,K. Ueno,S. Uno,Y. Ushiroda, G. S. Varner,Kevin Varvell,C. C. Wang,C. H. Wang,M. Watanabe,B. D. Yabsley,Yasuhiko Yamada,A. Yamaguchi,Y. Yamashita,M. Yamauchi, H. Yanai,Heyoung Yang,J. Ying, Y. Yusa, C. C. Zhang,Zhenyu Zhang,T. Ziegler,D. Žontar

Physical Review Letters(2004)

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摘要
We report a fully inclusive measurement of the flavor changing neutral current decay $b\\ensuremath{\\rightarrow}s\\ensuremath{\\gamma}$ in the energy range $1.8\\text{ }\\mathrm{G}\\mathrm{e}\\mathrm{V}\\ensuremath{\\le}{E}_{\\ensuremath{\\gamma}}^{*}\\ensuremath{\\le}2.8\\text{ }\\mathrm{G}\\mathrm{e}\\mathrm{V}$, covering 95% of the total spectrum. Using $140\\text{ }\\mathrm{f}{\\mathrm{b}}^{\\mathrm{\\ensuremath{-}}\\mathrm{1}}$, we obtain $\\mathcal{B}(b\\ensuremath{\\rightarrow}s\\ensuremath{\\gamma})=(3.55\\ifmmode\\pm\\else\\textpm\\fi{}{0.32}_{\\ensuremath{-}0.31\\ensuremath{-}0.07}^{+0.30+0.11})\\ifmmode\\times\\else\\texttimes\\fi{}{10}^{\\ensuremath{-}4}$, where the errors are statistical, systematic, and from theory corrections. We also measure the first and second moments of the photon energy spectrum above $1.8\\text{ }\\mathrm{G}\\mathrm{e}\\mathrm{V}$ and obtain $\\ensuremath{\\langle}{E}_{\\ensuremath{\\gamma}}\\ensuremath{\\rangle}=2.292\\ifmmode\\pm\\else\\textpm\\fi{}0.026\\ifmmode\\pm\\else\\textpm\\fi{}0.034\\text{ }\\mathrm{G}\\mathrm{e}\\mathrm{V}$ and $\\ensuremath{\\langle}{E}_{\\ensuremath{\\gamma}}^{2}\\ensuremath{\\rangle}\\ensuremath{-}\\ensuremath{\\langle}{E}_{\\ensuremath{\\gamma}}{\\ensuremath{\\rangle}}^{2}=0.0305\\ifmmode\\pm\\else\\textpm\\fi{}0.0074\\ifmmode\\pm\\else\\textpm\\fi{}0.0063\\text{ }{\\mathrm{G}\\mathrm{e}\\mathrm{V}}^{2}$, where the errors are statistical and systematic.
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