Measurement of Differential Branching Fractions of Inclusive
B→Xuℓ+νℓ
Decays
L. Cao,W. Sutcliffe,R. Van Tonder,F. U. Bernlochner,I. Adachi,H. Aihara,D. M. Asner,T. Aushev,R. Ayad,V. Babu,S. Bahinipati,P. Behera,K. Belous,J. Bennett,M. Bessner,T. Bilka,J. Biswal,A. Bobrov,M. Bračko,P. Branchini,T. E. Browder,A. Budano,M. Campajola,D. Červenkov,M.-C. Chang,P. Chang,B. G. Cheon,K. Chilikin,H. E. Cho,K. Cho,S.-J. Cho,Y. Choi,S. Choudhury,D. Cinabro,S. Cunliffe,T. Czank,N. Dash,G. De Pietro,R. Dhamija,F. Di Capua,J. Dingfelder,Z. Doležal,T. V. Dong,S. Dubey,D. Epifanov,T. Ferber,D. Ferlewicz,A. Frey,B. G. Fulsom,R. Garg,V. Gaur,N. Gabyshev,A. Garmash,A. Giri,P. Goldenzweig,T. Gu,K. Gudkova,S. Halder,T. Hara,O. Hartbrich,K. Hayasaka,M. Hernandez Villanueva,W.-S. Hou,C.-L. Hsu,K. Inami,A. Ishikawa,R. Itoh,M. Iwasaki,W. W. Jacobs,E.-J. Jang,S. Jia,Y. Jin,K. K. Joo,J. Kahn,K. H. Kang,H. Kichimi,C. Kiesling,C. H. Kim,D. Y. Kim,S. H. Kim,Y.-K. Kim,T. D. Kimmel,K. Kinoshita,P. Kodyš,T. Konno,A. Korobov,S. Korpar,E. Kovalenko,P. Križan,R. Kroeger,P. Krokovny,T. Kuhr,R. Kulasiri,M. Kumar,R. Kumar,K. Kumara,A. Kuzmin,Y.-J. Kwon,S. C. Lee,C. H. Li,J. Li,L. K. Li,Y. B. Li,L. Li Gioi,J. Libby,K. Lieret,D. Liventsev,C. MacQueen,M. Masuda,M. Merola,F. Metzner,K. Miyabayashi,R. Mizuk,G. B. Mohanty,S. Mohanty,M. Mrvar,M. Nakao,A. Natochii,L. Nayak,M. Niiyama,N. K. Nisar,S. Nishida,K. Nishimura,S. Ogawa,H. Ono,Y. Onuki,P. Oskin,G. Pakhlova,S. Pardi,H. Park,S.-H. Park,A. Passeri,S. Patra,S. Paul,T. K. Pedlar,L. E. Piilonen,T. Podobnik,V. Popov,E. Prencipe,M. T. Prim,M. Röhrken,A. Rostomyan,N. Rout,M. Rozanska,G. Russo,D. Sahoo,S. Sandilya,A. Sangal,L. Santelj,T. Sanuki,V. Savinov,G. Schnell,J. Schueler,C. Schwanda,A. J. Schwartz,Y. Seino,K. Senyo,M. E. Sevior,M. Shapkin,C. Sharma,C. P. Shen,J.-G. Shiu,B. Shwartz,F. Simon,A. Sokolov,E. Solovieva,M. Starič,J. F. Strube,M. Sumihama,T. Sumiyoshi,M. Takizawa,U. Tamponi,K. Tanida,Y. Tao,F. Tenchini,K. Trabelsi,M. Uchida,T. Uglov,S. Uno,P. Urquijo,S. E. Vahsen,G. Varner,K. E. Varvell,E. Waheed,C. H. Wang,E. Wang,M.-Z. Wang,P. Wang,X. L. Wang,M. Watanabe,S. Watanuki,O. Werbycka,E. Won,B. D. Yabsley,W. Yan,S. B. Yang,H. Ye,J. H. Yin,Z. P. Zhang,V. Zhilich,V. Zhukova
Physical Review Letters（2021）
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摘要
The first measurements of differential branching fractions of inclusive semileptonic B→X_{u}ℓ^{+}ν_{ℓ} decays are performed using the full Belle data set of 711 fb^{-1} of integrated luminosity at the ϒ(4S) resonance and for ℓ=e, μ. With the availability of these measurements, new avenues for future shape-function model-independent determinations of the Cabibbo-Kobayashi-Maskawa matrix element |V_{ub}| can be pursued to gain new insights in the existing tension with respect to exclusive determinations. The differential branching fractions are reported as a function of the lepton energy, the four-momentum-transfer squared, light-cone momenta, the hadronic mass, and the hadronic mass squared. They are obtained by subtracting the backgrounds from semileptonic B→X_{c}ℓ^{+}ν_{ℓ} decays and other processes, and corrected for resolution and acceptance effects.
