Search for B→πℓ+ℓ- decays at Belle
J. T. Wei,K. F. Chen,I. Adachi,Hiroaki Aihara, K. Arinstein, V. M. Aulchenko,T. Aushev, A. M. Bakich,Vladislav Balagura, K. Belous, U. Bitenc, A. Bondar, A. Bozek, M. Bračko,T. E. Browder,P. Chang, Y. Chao,A. Chen,W. T. Chen, B. G. Cheon, R. Chistov, I. S. Cho,Y. Choi,Jeremy Dalseno,S. Eidelman, B. Golob, H. Hayashii,D. Heffernan, Y. Hoshi,W. S. Hou, H. J. Hyun,T. Iijima,K. Inami,Hirokazu Ishino, R. Itoh,M. Iwasaki, Y. Iwasaki,D. H. Kah,J. H. Kang,P. Kapusta, T. Kawasaki,H. Kichimi,H. O. Kim,Jung-Hyun Kim,S. K. Kim,Y. I. Kim,Y. J. Kim,K. Kinoshita, S. Korpar,P. Krokovny,Rakesh Kumar,Y. J. Kwon,S. H. Kyeong,Joowon Lee,T. Lesiak,Antonio Limosani,S. W. Lin,D. Liventsev, F. Mandl, A. Matyja, S. McOnie,Tatiana Medvedeva,H. Miyata, Y. Miyazaki,G. R. Moloney, M. Nakao,S. Nishida,O. Nitoh, S. Ogawa,T. Ohshima, S. Okuno,H. Ozaki,P. Pakhlov,G. Pakhlova,C. W. Park,H. K. Park, R. Pestotnik, M. D. Peters,L. E. Piilonen, H. Sahoo, Y. Sakai,O. Schneider, C. Schwanda, K. Senyo, M. Shapkin, J. G. Shiu,Jasvinder A. Singh,A. Somov,Samo Stanič, M. Starič, K. Sumisawa,T. Sumiyoshi, F. Takasaki,M. Tanaka,G. N. Taylor, Y. Teramoto,I. Tikhomirov, S. Uehara,T. Uglov,Yoshinobu Unno Physical Review D（2008）
摘要
We present a search for the decays B+→π+l+l- and B0→π0l+l-, where l+l- is either a μ+μ- or e+e- pair, with a data sample of 657×106 BB pairs collected with the Belle detector at the KEKB e+e- collider. Signal events are reconstructed from a charged or a neutral pion candidate and a pair of oppositely charged electrons or muons. No significant signal is observed and we set an upper limit on the isospin-averaged branching fraction B(B→πl+l-)<6.2×10-8 at the 90% confidence level. © 2008 The American Physical Society.
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