First Measurement of R(X_{τ/ℓ}) as an Inclusive Test of the b→cτν Anomaly.

I Adachi,K Adamczyk,L Aggarwal,H Ahmed,H Aihara,N Akopov,A Aloisio,D M Asner, H Atmacan,T Aushev,V Aushev,M Aversano, V Babu,S Bahinipati,P Bambade,Sw Banerjee,S Bansal,M Barrett,J Baudot, A Baur, A Beaubien,F Becherer,J Becker,J V Bennett,F U Bernlochner,V Bertacchi,M Bertemes,E Bertholet,M Bessner,S Bettarini,B Bhuyan,F Bianchi,T Bilka,S Bilokin,D Biswas,A Bobrov,D Bodrov,A Bolz,A Bondar,A Bozek,M Bračko,P Branchini,R A Briere,T E Browder, A Budano,S Bussino,M Campajola,L Cao,G Casarosa,C Cecchi,J Cerasoli,M-C Chang,P Chang,P Cheema,B G Cheon,K Chilikin,K Chirapatpimol,H-E Cho,K Cho,S-J Cho,S-K Choi, S Choudhury,L Corona,L M Cremaldi,F Dattola,E De La Cruz-Burelo,S A De La Motte,G de Marino,G De Nardo,M De Nuccio,G De Pietro,R de Sangro,M Destefanis,R Dhamija,A Di Canto,F Di Capua,J Dingfelder,Z Doležal,T V Dong,M Dorigo,K Dort, S Dreyer,S Dubey,G Dujany,P Ecker,M Eliachevitch,D Epifanov,P Feichtinger,T Ferber, D Ferlewicz,T Fillinger,G Finocchiaro,A Fodor,F Forti,A Frey,B G Fulsom,E Ganiev,M Garcia-Hernandez,R Garg,G Gaudino,V Gaur,A Gaz,A Gellrich,G Ghevondyan,D Ghosh,H Ghumaryan,G Giakoustidis, R Giordano,A Giri,B Gobbo,R Godang,O Gogota,P Goldenzweig,W Gradl,T Grammatico,S Granderath,E Graziani,D Greenwald,Z Gruberová, T Gu,K Gudkova,S Halder,Y Han,T Hara,H Hayashii,S Hazra,C Hearty,M T Hedges,A Heidelbach, I Heredia de la Cruz,M Hernández Villanueva,T Higuchi,M Hoek,M Hohmann,P Horak,C-L Hsu,T Humair,T Iijima,N Ipsita,A Ishikawa,R Itoh,M Iwasaki,P Jackson,W W Jacobs,D E Jaffe,E-J Jang,S Jia,Y Jin, K K Joo,H Junkerkalefeld,D Kalita,A B Kaliyar,J Kandra, K H Kang,G Karyan, T Kawasaki,F Keil, C Kiesling,C-H Kim,D Y Kim, K-H Kim,Y-K Kim,K Kinoshita, P Kodyš,T Koga,S Kohani,K Kojima,A Korobov, S Korpar, E Kovalenko,R Kowalewski,T M G Kraetzschmar, P Križan,P Krokovny, T Kuhr,Y Kulii, M Kumar,K Kumara,T Kunigo,A Kuzmin,Y-J Kwon,S Lacaprara,T Lam,L Lanceri, J S Lange,M Laurenza,R Leboucher,F R Le Diberder,M J Lee,D Levit,P M Lewis,L K Li,Y Li, Y B Li,J Libby,M Liu, Q Y Liu,Z Q Liu,D Liventsev,S Longo,T Lueck,T Luo,C Lyu,Y Ma,M Maggiora,S P Maharana, R Maiti,S Maity,G Mancinelli,R Manfredi,E Manoni,A C Manthei,M Mantovano,D Marcantonio,S Marcello,C Marinas,L Martel,C Martellini,T Martinov,L Massaccesi,M Masuda, T Matsuda,K Matsuoka,D Matvienko,S K Maurya,J A McKenna,R Mehta,F Meier,M Merola,F Metzner,M Milesi,C Miller,M Mirra,K Miyabayashi,H Miyake,R Mizuk,G B Mohanty,N Molina-Gonzalez, S Mondal,S Moneta,H-G Moser,M Mrvar,R Mussa,I Nakamura,M Nakao,Y Nakazawa,A Narimani Charan, M Naruki,D Narwal, Z Natkaniec,A Natochii,L Nayak,M Nayak,G Nazaryan,C Niebuhr,S Nishida,S Ogawa,H Ono,Y Onuki,P Oskin,F Otani,P Pakhlov,G Pakhlova,A Panta,S Pardi,H Park,S-H Park,B Paschen,A Passeri,S Patra,S Paul, T K Pedlar, R Peschke, R Pestotnik,M Piccolo,L E Piilonen,P L M Podesta-Lerma,T Podobnik,S Pokharel,C Praz,S Prell,E Prencipe,M T Prim,H Purwar,P Rados,G Raeuber,S Raiz,N Rauls,M Reif,S Reiter,I Ripp-Baudot,G Rizzo,S H Robertson,P Rocchetti, M Roehrken,J M Roney,A Rostomyan,N Rout,G Russo,Y Sakai,D A Sanders,S Sandilya,L Santelj,Y Sato,V Savinov,B Scavino,C Schmitt,C Schwanda,Y Seino,A Selce,K Senyo,J Serrano,M E Sevior,C Sfienti,W Shan,C P Shen, X D Shi,T Shillington,T Shimasaki,J-G Shiu,D Shtol, A Sibidanov,F Simon,J B Singh,J Skorupa,R J Sobie,M Sobotzik,A Soffer,A Sokolov,E Solovieva,S Spataro,B Spruck,M Starič,P Stavroulakis,S Stefkova,R Stroili,M Sumihama, K Sumisawa,H Svidras,M Takizawa,U Tamponi,S Tanaka, K Tanida, F Tenchini,O Tittel, R Tiwary,D Tonelli,E Torassa,K Trabelsi,I Tsaklidis, M Uchida,I Ueda,Y Uematsu,T Uglov,K Unger,Y Unno,K Uno,S Uno,P Urquijo,Y Ushiroda,S E Vahsen,R van Tonder,K E Varvell,M Veronesi,A Vinokurova,V S Vismaya,L Vitale,R Volpe,B Wach,M Wakai,S Wallner, M-Z Wang,X L Wang, Z Wang,A Warburton,S Watanuki,C Wessel,E Won,X P Xu,B D Yabsley,S Yamada,S B Yang,J Yelton,J H Yin,K Yoshihara,C Z Yuan,B Zhang,Y Zhang,V Zhilich,Q D Zhou,X Y Zhou,V I Zhukova,Belle II Collaboration

arXiv (Cornell University)（2024）

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摘要

We measure the tau-to-light-lepton ratio of inclusive B-meson branching fractions R(X_{τ/ℓ})≡B(B→Xτν)/B(B→Xℓν), where ℓ indicates an electron or muon, and thereby test the universality of charged-current weak interactions. We select events that have one fully reconstructed B meson and a charged lepton candidate from 189 fb^{-1} of electron-positron collision data collected with the Belle II detector. We find R(X_{τ/ℓ})=0.228±0.016(stat)±0.036(syst), in agreement with standard-model expectations. This is the first direct measurement of R(X_{τ/ℓ}).

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