Test of Light-Lepton Universality in the Rates of Inclusive Semileptonic B-Meson Decays at Belle II.

作者信息

Aggarwal L, Ahmed H, Aihara H, Akopov N, Aloisio A, Anh Ky N, Asner D M, Atmacan H, Aushev T, Aushev V, Bae H, Bahinipati S, Bambade P, Banerjee Sw, Bansal S, Barrett M, Baudot J, Bauer M, Baur A, Beaubien A, Becker J, Bennett J V, Bernieri E, Bernlochner F U, Bertacchi V, Bertemes M, Bertholet E, Bessner M, Bettarini S, Bhardwaj V, Bhuyan B, Bianchi F, Bilka T, Bilokin S, Biswas D, Bodrov D, Borah J, Bozek A, Bračko M, Briere R A, Browder T E, Budano A, Bussino S, Campajola M, Cao L, Casarosa G, Cecchi C, Cerasoli J, Chang M-C, Cheaib R, Cheema P, Chekelian V, Cheon B G, Chilikin K, Chirapatpimol K, Cho H-E, Cho K, Cho S-J, Choi S-K, Choudhury S, Cochran J, Corona L, Cunliffe S, Dattola F, De La Cruz-Burelo E, De La Motte S A, De Nardo G, De Nuccio M, De Pietro G, de Sangro R, Destefanis M, Dhamija R, Di Capua F, Dingfelder J, Doležal Z, Dong T V, Dorigo M, Dossett D, Dreyer S, Dubey S, Dujany G, Ecker P, Eliachevitch M, Feichtinger P, Ferber T, Ferlewicz D, Fillinger T, Finocchiaro G, Fodor A, Forti F, Frey A, Fulsom B G, Gabrielli A, Ganiev E, Garcia-Hernandez M, Gaudino G, Gaur V, Gaz A, Gellrich A, Ghevondyan G, Giordano R, Giri A, Glazov A, Gobbo B, Godang R, Goldenzweig P, Gradl W, Grammatico T, Granderath S, Graziani E, Gruberová Z, Gu T, Gudkova K, Halder S, Hara T, Hayasaka K, Hayashii H, Hazra S, Hearty C, Hedges M T, Heredia de la Cruz I, Hernández Villanueva M, Hershenhorn A, Higuchi T, Hill E C, Hohmann M, Hsu C-L, Iijima T, Inami K, Inguglia G, Ipsita N, Ishikawa A, Ito S, Itoh R, Iwasaki M, Jacobs W W, Jang E-J, Ji Q P, Jia S, Jin Y, Junkerkalefeld H, Kaleta M, Kaliyar A B, Karyan G, Kawasaki T, Kiesling C, Kim C-H, Kim D Y, Kim K-H, Kim Y-K, Kindo H, Kinoshita K, Kodyš P, Kohani S, Kojima K, Korobov A, Korpar S, Kovalenko E, Kowalewski R, Križan P, Krokovny P, Kumar J, Kumar R, Kumara K, Kuzmin A, Kwon Y-J, Lacaprara S, Lange J S, Laurenza M, Leboucher R, Le Diberder F R, Levit D, Lewis P M, Li L K, Libby J, Liptak Z, Liu Q Y, Liu Z Q, Liventsev D, Longo S, Lueck T, Lyu C, Ma Y, Maggiora M, Maharana S P, Maiti R, Maity S, Manfredi R, Manoni E, Manthei A C, Mantovano M, Marinas C, Martel L, Martellini C, Martini A, Massaccesi L, Masuda M, Matsuoka K, Matvienko D, Maurya S K, McKenna J A, Meier F, Merola M, Metzner F, Milesi M, Miller C, Miyabayashi K, Mizuk R, Mohanty G B, Moneta S, Mrvar M, Mussa R, Nakamura I, Nakamura K R, Nakao M, Nakazawa Y, Narimani Charan A, Naruki M, Narwal D, Natochii A, Nayak L, Nazaryan G, Nisar N K, Nishida S, Ono H, Onuki Y, Oskin P, Pakhlov P, Pakhlova G, Paladino A, Panta A, Pardi S, Park H, Park J, Paschen B, Passeri A, Patra S, Paul S, Pedlar T K, Peruzzi I, Peschke R, Pestotnik R, Piilonen L E, Pinna Angioni G, Podesta-Lerma P L M, Podobnik T, Pokharel S, Polat L, Praz C, Prell S, Prencipe E, Prim M T, Purwar H, Rad N, Rados P, Raeuber G, Reif M, Reiter S, Ripp-Baudot I, Rizzo G, Rizzuto L B, Rocchetti P, Roney J M, Rostomyan A, Rout N, Sanders D A, Sandilya S, Sangal A, Santelj L, Sato Y, Scavino B, Schwanda C, Seino Y, Selce A, Senyo K, Sevior M E, Sfienti C, Shan W, Sharma C, Shen C P, Shillington T, Shiu J-G, Simon F, Singh J B, Skorupa J, Sobie R J, Soffer A, Sokolov A, Solovieva E, Spataro S, Spruck B, Starič M, Stefkova S, Stroili R, Sue Y, Sumihama M, Sutcliffe W, Suzuki S Y, Svidras H, Takizawa M, Tamponi U, Tanida K, Taniguchi N, Tenchini F, Tiwary R, Tonelli D, Torassa E, Trabelsi K, Tsaklidis I, Ueda I, Uematsu Y, Uglov T, Unger K, Unno Y, Uno K, Uno S, Urquijo P, Ushiroda Y, Vahsen S E, van Tonder R, Varner G S, Varvell K E, Vinokurova A, Vismaya V S, Vitale L, Vossen A, Wallner S, Wang E, Wang M-Z, Wang X L, Warburton A, Watanabe M, Watanuki S, Welsch M, Wessel C, Won E, Xu X P, Yabsley B D, Yamada S, Yan W, Yang S B, Ye H, Yin J H, Yook Y M, Yoshihara K, Zhai Y, Zhang Y, Zhilich V, Zhou Q D, Zhou X Y, Zhukova V I, Žlebčík R

出版信息

Phys Rev Lett. 2023 Aug 4;131(5):051804. doi: 10.1103/PhysRevLett.131.051804.

DOI:10.1103/PhysRevLett.131.051804

PMID:37595249

Abstract

We present the first measurement of the ratio of branching fractions of inclusive semileptonic B-meson decays, R(X_{e/μ})=B(B→Xeν)/B(B→Xμν), a precision test of electron-muon universality, using data corresponding to 189 fb^{-1} from electron-positron collisions collected with the Belle II detector. In events where the partner B meson is fully reconstructed, we use fits to the lepton momentum spectra above 1.3 GeV/c to obtain R(X_{e/μ})=1.007±0.009(stat)±0.019(syst), which is the most precise lepton-universality test of its kind and agrees with the standard-model expectation.

摘要