%O © 2005 The American Physical Society
%D 2005
%V 94
%N 11
%I AMERICAN PHYSICAL SOC
%L discovery1308459
%X We report the observation of the radiative decay B+-> K-1(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+-> K-1(1270)(+)gamma)=(4.3 +/- 0.9(stat.)+/- 0.9(syst.))x10(-5) with a significance of 7.3 sigma. We find no significant signal for B+-> K-1(1400)(+)gamma and set an upper limit B(B+-> K-1(1400)(+)gamma)< 1.5x10(-5) at the 90% confidence level. We also measure inclusive branching fractions for B+-> K(+)pi(+)pi(-)gamma and B-0-> K(0)pi(+)pi(-)gamma in the mass range 1 GeV/c(2)< M(K)(+(0))pi(+)pi(-)< 2 GeV/c(2).
%K B DECAYS
%J PHYS REV LETT
%A HY Yang
%A M Nakao
%A K Abe
%A K Abe
%A H Aihara
%A Y Asano
%A T Aushev
%A S Bahinipati
%A AM Bakich
%A Y Ban
%A I Bedny
%A U Bitenc
%A I Bizjak
%A S Blyth
%A A Bondar
%A A Bozek
%A M Bracko
%A J Brodzicka
%A TE Browder
%A MC Chang
%A P Chang
%A Y Chao
%A A Chen
%A WT Chen
%A BG Cheon
%A R Chistov
%A SK Choi
%A Y Choi
%A YK Choi
%A A Chuvikov
%A S Cole
%A J Dalseno
%A M Dash
%A S Eidelman
%A Y Enari
%A F Fang
%A N Gabyshev
%A A Garmash
%A T Gershon
%A G Gokhroo
%A B Golob
%A J Haba
%A K Hayasaka
%A H Hayashii
%A M Hazumi
%A L Hinz
%A T Hokuue
%A Y Hoshi
%A YB Hsiung
%A T Iijima
%A A Imoto
%A K Inami
%A Y Iwasaki
%A JH Kang
%A JS Kang
%A SU Kataoka
%A N Katayama
%A H Kawai
%A T Kawasaki
%A HR Khan
%A H Kichimi
%A HJ Kim
%A JH Kim
%A SK Kim
%A SM Kim
%A TH Kim
%A K Kinoshita
%A S Korpar
%A P Krokovny
%A CC Kuo
%A A Kuzmin
%A YJ Kwon
%A JS Lange
%A G Leder
%A SH Lee
%A T Lesiak
%A J Li
%A SW Lin
%A G Majumder
%A T Matsumoto
%A A Matyja
%A W Mitaroff
%A K Miyabayashi
%A H Miyake
%A H Miyata
%A R Mizuk
%A T Nagamine
%A Y Nagasaka
%A E Nakano
%A Z Natkaniec
%A S Nishida
%A O Nitoh
%A S Ogawa
%A T Ohshima
%A T Okabe
%A S Okuno
%A SL Olsen
%A W Ostrowicz
%A P Pakhlov
%A H Palka
%A CW Park
%A N Parslow
%A R Pestotnik
%A LE Piilonen
%A M Rozanska
%A H Sagawa
%A Y Sakai
%A N Sato
%A T Schietinger
%A O Schneider
%A J Schumann
%A C Schwanda
%A AJ Schwartz
%A R Seuster
%A H Shibuya
%A A Somov
%A N Soni
%A R Stamen
%A S Stanic
%A M Staric
%A K Sumisawa
%A T Sumiyoshi
%A S Suzuki
%A SY Suzuki
%A O Tajima
%A F Takasaki
%A N Tamura
%A M Tanaka
%A GN Taylor
%A Y Teramoto
%A XC Tian
%A T Tsukamoto
%A S Uehara
%A T Uglov
%A K Ueno
%A S Uno
%A Y Ushiroda
%A G Varner
%A KE Varvell
%A S Villa
%A CH Wang
%A MZ Wang
%A M Watanabe
%A A Yamaguchi
%A Y Yamashita
%A M Yamauchi
%A Y Yuan
%A LM Zhang
%A ZP Zhang
%A V Zhilich
%A D Zontar
%A D Zurcher
%T Observation of B+-> K-1(1270)(+)gamma