Observation of B+-->K1(1270)+gamma.

Heyoung Yang,M Nakao,K Abe,K Abe,H Aihara,Y Asano,T Aushev,S Bahinipati,A M Bakich,Y Ban,I Bedny,U Bitenc,I Bizjak,S Blyth,A Bondar,A Bozek,M Bracko,J Brodzicka,T E Browder,M-C Chang,P Chang,Y Chao,A Chen,W T Chen,B G Cheon,R Chistov,S-K Choi,Y Choi,Y K Choi,A Chuvikov,S Cole,J Dalseno,M Dash,S Eidelman,Y Enari,F Fang,N Gabyshev,A Garmash,T Gershon,G Gokhroo,B Golob,J Haba,K Hayasaka,H Hayashii,M Hazumi,L Hinz,T Hokuue,Y Hoshi,Y B Hsiung,T Iijima,A Imoto,K Inami,Y Iwasaki,J H Kang,J S Kang,S U Kataoka,N Katayama,H Kawai,T Kawasaki,H R Khan,H Kichimi,H J Kim,J H Kim,S K Kim,S M Kim,T H Kim,K Kinoshita,S Korpar,P Krokovny,C C Kuo,A Kuzmin,Y-J Kwon,J S Lange,G Leder,S H Lee,T Lesiak,J Li,S-W Lin,G Majumder,T Matsumoto,A Matyja,W Mitaroff,K Miyabayashi,H Miyake,H Miyata,R Mizuk,T Nagamine,Y Nagasaka,E Nakano,Z Natkaniec,S Nishida,O Nitoh,S Ogawa,T Ohshima,T Okabe,S Okuno,S L Olsen,W Ostrowicz,P Pakhlov,H Palka,C W Park,N Parslow,R Pestotnik,L E Piilonen,M Rozanska,H Sagawa,Y Sakai,N Sato,T Schietinger,O Schneider,J Schümann,C Schwanda,A J Schwartz,R Seuster,H Shibuya,A Somov,N Soni,R Stamen,S Stanic,M Staric,K Sumisawa,T Sumiyoshi,S Suzuki,S Y Suzuki,O Tajima,F Takasaki,N Tamura,M Tanaka,G N Taylor,Y Teramoto,X C Tian,T Tsukamoto,S Uehara,T Uglov,K Ueno,S Uno,Y Ushiroda,G Varner,K E Varvell,S Villa,C H Wang,M-Z Wang,M Watanabe,A Yamaguchi,Y Yamashita,M Yamauchi,Y Yuan,L M Zhang,Z P Zhang,V Zhilich,D Zontar,D Zürcher,

PHYSICAL REVIEW LETTERS（2005）

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Abstract

We report the observation of the radiative decay B+-->K1(1270)(+) gamma using a data sample of 140 fb(-1) taken at the Upsilon(4S) resonance with the Belle detector at the KEKB e+e- collider. We find the branching fraction to be B(B+-->K1(1270)(+)gamma)=(4.3+/-0.9(stat.)+/-0.9(syst.))x10(-5) with a significance of 7.3sigma. We find no significant signal for B+-->K1(1400)(+)gamma and set an upper limit B(B+-->K1(1400)(+)gamma)<1.5 x 10(-5) at the 90% confidence level. We also measure inclusive branching fractions for B+-->K+pi+pi-gamma and B0-->K0pi+pi-gamma in the mass range 1 GeV/c(2)More

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statistical significance

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