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

作者信息

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

出版信息

Phys Rev Lett. 2024 May 24;132(21):211804. doi: 10.1103/PhysRevLett.132.211804.

DOI:10.1103/PhysRevLett.132.211804

PMID:38856254

Abstract

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}).

摘要