Search forB+→e+νeandB+→μ+νμdecays using hadronic tagging

Y Yook,V Chobanova,E Nedelkovska,Y Iwasaki,M Sumihama,A Moll,D Červenkov,B Shwartz,V Bansal,A Ishikawa,Z Doležal,Y Sakai,I Adachi,T Uglov,T Sumiyoshi,P Pakhlov,V Chekelian,P Krokovny,R Gillard,V Gaur,G Bonvicini,Y Teramoto,T Sanuki,V Savinov,A Bala,O Frost,R Pestotnik,A Garmash,H Miyata,Y Li,T Kuhr,T Julius,E Kato,Z Drásal,A Kuzmin,Y Usov,Y Hoshi,R Itoh,H Park,T Ferber,R Glattauer,Y Yusa,S Sandilya,T Kawasaki,O Grzymkowska,T Iijima,K Kinoshita,G Tatishvili,P Katrenko,A Rostomyan,A Chen,M Starič,K Senyo,G Schnell,K Trabelsi,O Schneider,K Dutta,J Haba,R Chistov,L Li Gioi,P Vanhoefer,S Wehle,M Nayak,R Ayad,Z Natkaniec,N Gabyshev,A Vinokurova,K Miyabayashi,B Bhuyan,K Chilikin,V Vorobyev,K Arinstein,A Abdesselam,P Križan,A Zupanc,M Röhrken,V Bhardwaj,O Seon,A Drutskoy,E Solovieva,R Mussa,H Farhat,M Nakao,K Hayasaka,S Nishida,T Higuchi,E Nakano,O Nitoh,S Eidelman,T Aushev,C Schwanda,S Yashchenko,C Kiesling,S Korpar,M Steder,B Golob,M Heck,S Okuno,E Won,Y Choi,D Liventsev,M Watanabe,Y Watanabe,M Bračko,I Nakamura,S Al Said,M Uchida,Y Yamashita,H Hayashii,J Klucar,S Ogawa,P Kodyš,V Aulchenko,W.-S Hou,F Simon,G Varner,S Bahinipati,S Ryu,P Urquijo,D Dutta,K Cho,T Iwashita,S Ganguly,M Ritter,Y Horii,J H Kim ,J S Lange ,T A Shibata ,M N Wagner ,X He ,A Bożek ,Z P Zhang ,G B Mohanty ,K M Williams ,M Z Wang ,M J Kim ,L Šantelj ,J G Shiu ,X L Wang ,D Y Kim ,H K Park ,K E Varvell ,B R Ko ,N K Nisar ,C S Park ,T E Browder ,L E Piilonen ,I Jaeglé ,C H Wang ,Y M Goh ,Y S Sohn ,C P Shen ,T K Pedlar ,K T Kim ,Y J Kim ,D M Asner ,Y J Kwon ,J B Kim ,J E Fast ,A M Bakich ,B G Cheon ,M E Sevior ,P Lukin,P Wang,C Liu,Y Sato,M Petrič,Y Liu,C Van Hulse,V Zhilich,K Hara,Y Nagasaka,T Saito,A Bondar,V Shebalin,A Sokolov,A Sibidanov

doi:10.1103/physrevd.91.052016

Abstract

We present a search for the rare leptonic decays B+→e+νe and B+→μ+νμ, using the full ϒ(4S) data sample of 772×106 BB¯ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e− collider. One of the B mesons from the ϒ(4S)→BB¯ decay is fully reconstructed in a hadronic mode, while the recoiling side is analyzed for the signal decay. We find no evidence of a signal in any of the decay modes. Upper limits of the corresponding branching fractions are determined as B(B+→e+νe)<3.5×10−6 and B(B+→μ+νμ)<2.7×10−6 at 90% confidence level.Received 25 June 2014DOI:https://doi.org/10.1103/PhysRevD.91.052016© 2015 American Physical Society

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