Measurement of the $\tau$-lepton mass with the Belle~II experiment
Belle II Collaboration,I. Adachi,K. Adamczyk,L. Aggarwal,H. Ahmed,H. Aihara,N. Akopov,A. Aloisio,N. Anh Ky,D. M. Asner,H. Atmacan,T. Aushev,V. Aushev,M. Aversano,V. Babu,H. Bae,S. Bahinipati,P. Bambade,Sw. Banerjee,M. Barrett,J. Baudot,M. Bauer,A. Baur,A. Beaubien,F. Becherer,J. Becker,P. K. Behera,J. V. Bennett,F. U. Bernlochner,V. Bertacchi,M. Bertemes,E. Bertholet,M. Bessner,S. Bettarini,B. Bhuyan,F. Bianchi,T. Bilka,D. Biswas,A. Bobrov,D. Bodrov,A. Bolz,A. Bondar,J. Borah,A. Bozek,M. Bračko,P. Branchini,T. E. Browder,A. Budano,S. Bussino,M. Campajola,L. Cao,G. Casarosa,C. Cecchi,J. Cerasoli,M. -C. Chang,P. Chang,R. Cheaib,P. Cheema,V. Chekelian,B. G. Cheon,K. Chilikin,K. Chirapatpimol,H. -E. Cho,K. Cho,S. -J. Cho,S. -K. Choi,S. Choudhury,J. Cochran,L. Corona,L. M. Cremaldi,S. Das,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,S. Dey,A. De Yta-Hernandez,R. Dhamija,A. Di Canto,F. Di Capua,J. Dingfelder,Z. Doležal,I. Domínguez Jiménez,T. V. Dong,M. Dorigo,K. Dort,S. Dreyer,S. Dubey,G. Dujany,P. Ecker,M. Eliachevitch,P. Feichtinger,T. Ferber,D. Ferlewicz,T. Fillinger,C. Finck,G. Finocchiaro,A. Fodor,F. Forti,A. Frey,B. G. Fulsom,A. Gabrielli,E. Ganiev,M. Garcia-Hernandez,A. Garmash,G. Gaudino,V. Gaur,A. Gaz,A. Gellrich,G. Ghevondyan,D. Ghosh,H. Ghumaryan,G. Giakoustidis,R. Giordano,A. Giri,A. Glazov,B. Gobbo,R. Godang,O. Gogota,P. Goldenzweig,P. Grace,W. Gradl,T. Grammatico,S. Granderath,E. Graziani,D. Greenwald,Z. Gruberová,T. Gu,Y. Guan,K. Gudkova,S. Halder,Y. Han,T. Hara,K. Hayasaka,H. Hayashii,S. Hazra,C. Hearty,M. T. Hedges,I. Heredia de la Cruz,M. Hernández Villanueva,A. Hershenhorn,T. Higuchi,E. C. Hill,M. Hoek,M. Hohmann,C. -L. Hsu,T. Iijima,K. Inami,G. Inguglia,N. Ipsita,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,A. Johnson,K. K. Joo,H. Junkerkalefeld,D. Kalita,A. B. Kaliyar,J. Kandra,K. H. Kang,G. Karyan,T. Kawasaki,F. Keil,C. Ketter,C. Kiesling,C. -H. Kim,D. Y. Kim,K. -H. Kim,Y. -K. Kim,H. Kindo,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,J. Kumar,M. Kumar,K. Kumara,T. Kunigo,A. Kuzmin,Y. -J. Kwon,S. Lacaprara,Y. -T. Lai,T. Lam,L. Lanceri,J. S. Lange,M. Laurenza,K. Lautenbach,R. Leboucher,F. R. Le Diberder,P. Leitl,D. Levit,P. M. Lewis,C. Li,L. K. Li,Y. Li,J. Libby,Q. Y. Liu,Z. Q. Liu,D. Liventsev,S. Longo,T. Lueck,C. Lyu,Y. Ma,M. Maggiora,S. P. Maharana,R. Maiti,S. Maity,G. Mancinelli,R. Manfredi,E. Manoni,M. Mantovano,D. Marcantonio,S. Marcello,C. Marinas,L. Martel,C. Martellini,A. Martini,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,R. Mizuk,G. B. Mohanty,N. Molina-Gonzalez,S. Mondal,S. Moneta,H. -G. Moser,M. Mrvar,R. Mussa,I. Nakamura,Y. Nakazawa,A. Narimani Charan,M. Naruki,Z. Natkaniec,A. Natochii,L. Nayak,M. Nayak,G. Nazaryan,C. Niebuhr,N. K. Nisar,S. Nishida,H. Ono,Y. Onuki,P. Oskin,F. Otani,P. Pakhlov,G. Pakhlova,A. Paladino,A. Panta,E. Paoloni,S. Pardi,K. Parham,H. Park,S. -H. Park,A. Passeri,S. Patra,S. Paul,T. K. Pedlar,I. Peruzzi,R. Peschke,R. Pestotnik,F. Pham,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,N. Rad,P. Rados,G. Raeuber,S. Raiz,M. Reif,S. Reiter,M. Remnev,I. Ripp-Baudot,G. Rizzo,S. H. Robertson,M. Roehrken,J. M. Roney,A. Rostomyan,N. Rout,G. Russo,D. Sahoo,S. Sandilya,A. Sangal,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. Sharma,C. P. Shen,X. D. Shi,T. Shillington,J. -G. Shiu,D. Shtol,B. Shwartz,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,Z. S. Stottler,R. Stroili,M. Sumihama,K. Sumisawa,W. Sutcliffe,H. Svidras,M. Takahashi,M. Takizawa,U. Tamponi,K. Tanida,F. Tenchini,A. Thaller,O. Tittel,R. Tiwary,D. Tonelli,E. Torassa,N. Toutounji,K. Trabelsi,I. Tsaklidis,I. Ueda,T. Uglov,K. Unger,Y. Unno,K. Uno,S. Uno,P. Urquijo,Y. Ushiroda,S. E. Vahsen,R. van Tonder,G. S. Varner,K. E. Varvell,M. Veronesi,V. S. Vismaya,L. Vitale,V. Vobbilisetti,R. Volpe,B. Wach,M. Wakai,S. Wallner,E. Wang,M. -Z. Wang,Z. Wang,A. Warburton,M. Watanabe,S. Watanuki,M. Welsch,C. Wessel,E. Won,X. P. Xu,B. D. Yabsley,S. Yamada,W. Yan,S. B. Yang,J. H. Yin,K. Yoshihara,C. Z. Yuan,Y. Yusa,L. Zani,V. Zhilich,J. S. Zhou,Q. D. Zhou,V. I. Zhukova,R. Žlebčík
arXiv (Cornell University)（2023）
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摘要
We present a measurement of the $\tau$-lepton mass using a sample of about 175 million $e^+e^- \to \tau^+\tau^-$ events collected with the Belle II detector at the SuperKEKB $e^+e^-$ collider at a center-of-mass energy of $10.579\,\mathrm{Ge\kern -0.1em V}$. This sample corresponds to an integrated luminosity of $190\,\mathrm{fb^{-1}}$. We use the kinematic edge of the $\tau $ pseudomass distribution in the decay ${\tau^-\to\pi^-\pi^+\pi^-\nu_\tau}$ and measure the $\tau$ mass to be $1777.09 \pm 0.08 \pm 0.11 \,\mathrm{Me\kern -0.1em V\!/c^2}$, where the first uncertainty is statistical and the second systematic. This result is the most precise to date.
