Measurement of lepton mass squared moments in B -> X(c)l(nu)over-bar(l) decays with the Belle II experiment
F. Abudinen,K. Adamczyk,L. Aggarwal,H. Ahmed,H. Aihara,N. Akopov,A. Aloisio,N. Anh Ky,D. M. Asner,H. Atmacan,T. Aushev,V. Aushev,V. Babu,S. Bacher,H. Bae,S. Baehr,S. Bahinipati P. Bambade,Sw. Banerjee,M. Barrett,J. Baudot,M. Bauer,A. Baur,J. Becker,P. K. Behera,J. V. Bennett,F. U. Bernlochner,M. Bertemes,E. Bertholet,M. Bessner,S. Bettarini,B. Bhuyan,F. Bianchi,T. Bilka,D. Biswas,A. Bobrov,D. Bodrov,A. Bolz,J. Borah,A. Bozek,M. Bracko,P. Branchini,R. A. Briere,T. E. Browder,A. Budano,S. Bussino,M. Campajola,L. Cao,G. Casarosa,C. Cecchi,D. Cervenkov,M. -C. Chang,P. Chang,R. Cheaib,P. Cheema,V. Chekelian,C. Chen,Y. -T. Chen,B. G. Cheon,K. Chilikin,K. Chirapatpimol,H. -E. Cho,K. Cho,S. -J. Cho,S. -K. Choi,S. Choudhury,D. Cinabro,L. Corona,L. M. Cremaldi,S. Cunliffe,T. Czank,F. Dattola,E. De La Cruz-Burelo,G. de Marino,G. De Nardo,M. De Nuccio,G. De Pietro,R. de Sangro,M. Destefanis,S. Dey,A. De Yta-Hernandez,R. Dhamija,A. Di Canto,F. Di Capua,J. Dingfelder,Z. Dolezal,I. Dominguez Jimenez,T. V. Dong,M. Dorigo,K. Dort,D. Dossett,S. Dreyer,S. Dubey,S. Duell,G. Dujany,P. Ecker,M. Eliachevitch,D. Epifanov,P. Feichtinger,T. Ferber,D. Ferlewicz,T. Fillinger,C. Finck,G. Finocchiaro,S. Fiore,K. Flood,A. Fodor,F. Forti,B. G. Fulsom,A. Gabrielli,E. Ganiev,M. Garcia-Hernandez,R. Garg,V. Gaur,A. Gaz,A. Gellrich,R. Giordano,A. Giri,A. Glazov,B. Gobbo,R. Godang,P. Goldenzweig,P. Grace,W. Gradl,E. Graziani,D. Greenwald,T. Gu,K. Gudkova,J. Guilliams,C. Hadjivasiliou,S. Halder,T. Hara,O. Hartbrich,K. Hayasaka,H. Hayashii,S. Hazra,C. Hearty,M. T. Hedges,I. Heredia de la Cruz,M. Hernandez Villanueva,A. Hershenhorn,T. Higuchi,E. C. Hill,M. Hohmann,C. L. Hsu,T. Iijima,K. Inami,G. Inguglia,A. Ishikawa,S. Ito,R. Itoh,M. Iwasaki,P. Jackson,W. W. Jacobs,D. E. Jaffe,E. -J. Jang,Q. P. Ji,S. Jia,Y. Jin,H. Junkerkalefeld,H. Kakuno,M. Kaleta,A. B. Kaliyar,J. Kandra,K. H. Kang,R. Karl,G. Karyan,T. Kawasaki,C. Ketter,H. Kichimi,C. Kiesling,C. -H. Kim,D. Y. Kim,K. -H. Kim,Y. -K. Kim,P. Kodys,T. Koga,S. Kohani,K. Kojima,T. Konno,A. Korobov,S. Korpar,E. Kovalenko,R. Kowalewski,T. M. G. Kraetzschmar,P. Krizan,P. Krokovny,T. Kuhr,J. Kumar,M. Kumar,R. Kumar,K. Kumara,T. Kunigo,S. Kurz,A. Kuzmin,Y. -J. Kwon,S. Lacaprara,Y. -T. Lai,C. La Licata,K. Lalwani,T. Lam,L. Lanceri,J. S. Lange,K. Lautenbach,R. Leboucher,F. R. Le Diberder,S. C. Lee,P. Leitl,D. Levit,P. M. Lewis,C. Li,L. K. Li,S. X. Li,Y. B. Li,J. Libby,K. Lieret,Z. Liptak,Q. Y. Liu,D. Liventsev,S. Longo,A. Lozar,T. Lueck,C. Lyu,M. Maggiora,R. Maiti,S. Maity,R. Manfredi,E. Manoni,C. Marinas,L. Martel,A. Martini,L. Massaccesi,M. Masuda,K. Matsuoka,D. Matvienko,J. A. McKenna,F. Meier,M. Merola,F. Metzner,M. Milesi,C. Miller,K. Miyabayashi,R. Mizuk,G. B. Mohanty,N. Molina-Gonzalez,S. Moneta,H. Moon,H. -G. Moser,M. Mrvar,F. Mueller,C. Murphy,I. Nakamura,K. R. Nakamura,M. Nakao,H. Nakayama,M. Naruki,A. Natochii,L. Nayak,M. Nayak,G. Nazaryan,C. Niebuhr,N. K. Nisar,S. Nishida,K. Nishimura,K. Ogawa,S. Ogawa,Y. Onishchuk,H. Ono,P. Oskin,H. Ozaki,P. Pakhlov,G. Pakhlova,A. Paladino,T. Pang,A. Panta,S. Pardi,K. Parham,H. Park,S. -H. Park,A. Passeri,A. Pathak,S. Patra,S. Paul,T. K. Pedlar,R. Peschke,R. Pestotnik,F. Pham,L. E. Piilonen,G. Pinna Angioni,P. L. M. Podesta-Lerma,T. Podobnik,S. Pokharel,L. Polat,V. Popov,C. Praz,S. Prell,E. Prencipe,M. T. Prim,H. Purwar,P. Rados,S. Raiz,S. Reiter,M. Remnev,I. Ripp-Baudot,G. Rizzo,L. B. Rizzuto,S. H. Robertson,D. Rodriguez Perez,J. M. Roney,A. Rostomyan,N. Rout,M. Rozanska,G. Russo,D. Sahoo,D. A. Sanders,S. Sandilya,A. Sangal,L. Santelj,Y. Sato,V. Savinov,B. Scavino,J. Schueler,C. Schwanda,A. J. Schwartz,Y. Seino,A. Selce,K. Senyo,J. Serrano,M. E. Sevior,C. Sfienti,V. Shebalin,T. Shillington,J. -G. Shiu,B. Shwartz,A. Sibidanov,F. Simon,J. B. Singh,J. Skorupa,R. J. Sobie,A. Soffer,A. Sokolov,E. Solovieva,S. Spataro,B. Spruck,M. Staric,S. Stefkova,Z. S. Stottler,R. Stroili,M. Sumihama,K. Sumisawa,W. Sutcliffe,S. Y. Suzuki,H. Svidras,M. Tabata,M. Takahashi,M. Takizawa,U. Tamponi,S. Tanaka,K. Tanida,H. Tanigawa,N. Taniguchi,F. Tenchini,R. Tiwary,D. Tonelli,E. Torassa,N. Toutounji,K. Trabelsi,M. Uchida,I. Ueda,S. Uehara,T. Uglov,K. Unger,Y. Unno,K. Uno,S. Uno,Y. Ushiroda,S. E. Vahsen,R. van Tonder,G. S. Varner,K. E. Varvell,A. Vinokurova,L. Vitale,V. Vobbilisetti,A. Vossen,E. Waheed,H. M. Wakeling,E. Wang,M. -Z. Wang,X. L. Wang,A. Warburton,M. Watanabe,S. Watanuki,M. Welsch,C. Wessel,H. Windel,E. Won,X. P. Xu,B. D. Yabsley,S. Yamada,W. Yan,S. B. Yang,H. Ye,J. H. Yin,Y. M. Yook,K. Yoshihara,C. Z. Yuan,Y. Yusa,L. Zani,Y. Zhai,Y. Zhang,V. Zhilich,Q. D. Zhou,X. Y. Zhou,V. I. Zhukova,R. Zlebcik
PHYSICAL REVIEW D（2023）
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摘要
We present measurements of the first to fourth moments of the lepton mass squared q(2) of B -> X(c)l (nu) over bar (l) decays for l = e, mu and with X-c a hadronic system containing a charm quark. These results use a sample of electron-positron collisions at the Upsilon(4S) resonance corresponding to 62.8 fb(-1) of integrated luminosity and collected by the Belle II 2 experiment in 2019 and 2020. To identify the X-c system and reconstruct q(2), one of the B mesons from an Upsilon(4S) -> B (B) over bar decay is fully reconstructed in a hadronic decay mode using a multivariate B tagging algorithm. We report raw and central moments for q(2) > 1.5 GeV2/c(4) up to q(2) > 8.5 GeV2/c(4), probing up to 77% of the accessible B -> X(c)l (nu) over bar (l) phase space. This is the first measurement of moments in the experimentally challenging range of [1.5, 2.5] GeV2/c(4). The results can be used for a new determination of vertical bar V-cb vertical bar using inclusive B -> X(c)l (nu) over bar (l) decays.
