Measurement of the branching fractions of the B+ -> eta l(+)nu(l) and B+ -> eta ' l(+)nu(l) decays with signal-side only reconstruction in the full q(2) range
U. Gebauer,C. Beleno,A. Frey,I Adachi,K. Adamczyk,H. Aihara,S. Al Said,D. M. Asner,H. Atmacan,T. Aushev,R. Ayad,V Babu,S. Bahinipati,P. Behera,K. Belous,J. Bennett,M. Bessner,V Bhardwaj,B. Bhuyan,T. Bilka,J. Biswal,A. Bobrov,G. Bonvicini,A. Bozek,M. Bracko,T. E. Browder,M. Campajola,L. Cao,D. Cervenkov,M-C Chang,V Chekelian,A. Chen,B. G. Cheon,K. Chilikin,H. E. Cho,K. Cho,S-J Cho,S-K Choi,Y. Choi,S. Choudhury,D. Cinabro,S. Cunliffe,S. Das,N. Dash,G. De Nardo,F. Di Capua,J. Dingfelder,Z. Dolezal,T. Dong,S. Eidelman,D. Epifanov,T. Ferber,D. Ferlewicz,B. G. Fulsom,R. Garg,V Gaur,N. Gabyshev,A. Garmash,A. Giri,P. Goldenzweig,B. Golob,K. Gudkova,C. Hadjivasiliou,S. Halder,T. Hara,O. Hartbrich,K. Hayasaka,H. Hayashii,M. T. Hedges,W-S Hou,C-L Hsu,T. Iijima,K. Inami,A. Ishikawa,R. Itoh,M. Iwasaki,Y. Iwasaki,W. W. Jacobs,S. Jia,Y. Jin,C. W. Joo,K. K. Joo,J. Kahn,A. B. Kaliyar,K. H. Kang,G. Karyan,T. Kawasaki,H. Kichimi,C. Kiesling,C. H. Kim,D. Y. Kim,S. H. Kim,Y-K Kim,K. Kinoshita,P. Kodys,T. Konno,A. Korobov,S. Korpar,E. Kovalenko,P. Krizan,R. Kroeger,P. Krokovny,T. Kuhr,M. Kumar,R. Kumar,K. Kumara,A. Kuzmin,Y-J Kwon,K. Lalwani,J. S. Lange,I. S. Lee,S. C. Lee,P. Lewis,Y. B. Li,L. Li Gioi,J. Libby,K. Lieret,D. Liventsev,C. MacQueen,M. Masuda,T. Matsuda,D. Matvienko,M. Merola,F. Metzner,K. Miyabayashi,R. Mizuk,G. B. Mohanty,M. Mrvar,R. Mussa,M. Nakao,Z. Natkaniec,A. Natochii,L. Nayak,M. Nayak,N. K. Nisar,S. Nishida,K. Nishimura,S. Ogawa,H. Ono,Y. Onuki,P. Oskin,P. Pakhlov,G. Pakhlova,S. Pardi,H. Park,S-H Park,S. Patra,S. Paul,T. K. Pedlar,R. Pestotnik,L. E. Piilonen,T. Podobnik,E. Prencipe,M. T. Prim,M. Purohit,M. Roehrken,A. Rostomyan,N. Rout,G. Russo,D. Sahoo,S. Sandilya,A. Sangal,L. Santelj,T. Sanuki,V Savinov,G. Schnell,J. Schueler,C. Schwanda,Y. Seino,K. Senyo,M. E. Sevior,M. Shapkin,C. Sharma,J-G Shiu,B. Shwartz,F. Simon,E. Solovieva,S. Stanic,M. Staric,Z. S. Stottler,T. Sumiyoshi,M. Takizawa,U. Tamponi,F. Tenchini,K. Trabelsi,M. Uchida,T. Uglov,Y. Unno,S. Uno,P. Urquijo,R. Van Tonder,G. Varner,K. E. Varvell,A. Vossen,E. Waheed,C. H. Wang,M-Z Wang,P. Wang,X. L. Wang,S. Watanuki,J. Wiechczynski,E. Won,X. Xu,B. D. Yabsley,W. Yan,S. B. Yang,H. Ye,J. H. Yin,C. Z. Yuan,Z. P. Zhang,V Zhilich,V Zhukova
PHYSICAL REVIEW D（2022）
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摘要
The branching fractions of the decays B+ -> eta l(+)nu(l) and B+ -> eta'l(+)nu(l) are measured, where l is either an electron or a muon, using a data sample of 711 fb(-1) containing 772 x 10(6)B (B) over bar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. To reduce the dependence of the result on the form factor model, the measurement is performed over the entire q(2) range. The resulting branching fractions are B(B+ -> eta l(+)nu(l)) = (2.83 +/- 0.55((stat.)) +/- 0.34((syst.))) x 10(-5) and B(B+ -> eta'l(+)nu(l)) = (2.79 +/- 1.29((stat.)) +/- 0.30((syst.))) x 10(-5).
