Search for B−→μ−ν¯μ Decays at the Belle Experiment
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Search for B−→μ−ν¯μ Decays at the Belle Experiment

A. Sibidanov,K. E. Varvell,I. Adachi,H. Aihara,S. Al Said,D. M. Asner,T. Aushev,R. Ayad,V. Babu,I. Badhrees,S. Bahinipati,A. M. Bakich,V. Bansal,E. Barberio,P. Behera,B. Bhuyan,J. Biswal,A. Bozek,M. Bračko,T. E. Browder,D. Červenkov,P. Chang,V. Chekelian,A. Chen,B. G. Cheon,K. Chilikin,K. Cho,S.-K. Choi,Y. Choi,D. Cinabro,T. Czank,N. Dash,S. Di Carlo,Z. Doležal,Z. Drásal,D. Dutta,S. Eidelman,D. Epifanov,J. E. Fast,T. Ferber,B. G. Fulsom,V. Gaur,N. Gabyshev,A. Garmash,P. Goldenzweig,D. Greenwald,Y. Guan,E. Guido,J. Haba,K. Hayasaka,H. Hayashii,M. T. Hedges,S. Hirose,W.-S. Hou,C.-L. Hsu,T. Iijima,K. Inami,G. Inguglia,A. Ishikawa,R. Itoh,M. Iwasaki,W. W. Jacobs,I. Jaegle,H. B. Jeon,Y. Jin,K. K. Joo,T. Julius,J. Kahn,A. B. Kaliyar,K. H. Kang,G. Karyan,T. Kawasaki,C. Kiesling,D. Y. Kim,J. B. Kim,S. H. Kim,Y. J. Kim,K. Kinoshita,P. Kodyš,S. Korpar,D. Kotchetkov,P. Križan,P. Krokovny,T. Kuhr,R. Kulasiri,R. Kumar,A. Kuzmin,Y.-J. Kwon,J. S. Lange,I. S. Lee,C. H. Li,L. Li,L. Li Gioi,J. Libby,D. Liventsev,M. Lubej,T. Luo,M. Masuda,T. Matsuda,M. Merola,K. Miyabayashi,H. Miyata,R. Mizuk,G. B. Mohanty,H. K. Moon,T. Mori,R. Mussa,E. Nakano,M. Nakao,T. Nanut,K. J. Nath,Z. Natkaniec,M. Nayak,M. Niiyama,N. K. Nisar,S. Nishida,S. Ogawa,S. Okuno,H. Ono,P. Pakhlov,G. Pakhlova,B. Pal,C.-S. Park,H. Park,S. Paul,T. K. Pedlar,R. Pestotnik,L. E. Piilonen,M. Ritter,A. Rostomyan,M. Rozanska,Y. Sakai,M. Salehi,S. Sandilya,Y. Sato,V. Savinov,O. Schneider,G. Schnell,C. Schwanda,Y. Seino,K. Senyo,M. E. Sevior,V. Shebalin,C. P. Shen,T.-A. Shibata,J.-G. Shiu,F. Simon,A. Sokolov,E. Solovieva,M. Starič,J. F. Strube,J. Stypula,M. Sumihama,K. Sumisawa,T. Sumiyoshi,M. Takizawa,U. Tamponi,K. Tanida,F. Tenchini,K. Trabelsi,M. Uchida,S. Uehara,T. Uglov,Y. Unno,S. Uno,P. Urquijo,C. Van Hulse,G. Varner,V. Vorobyev,C. H. Wang,M.-Z. Wang,P. Wang,M. Watanabe,S. Watanuki,E. Widmann,E. Won,Y. Yamashita,H. Ye,J. Yelton,C. Z. Yuan,Y. Yusa,Z. P. Zhang,V. Zhilich,V. Zhukova,V. Zhulanov,A. Zupanc,The Belle Collaboration;A. Sibidanov;K. E. Varvell;I. Adachi;H. Aihara;S. Al Said;D. M. Asner;T. Aushev;R. Ayad;V. Babu;I. Badhrees;S. Bahinipati;A. M. Bakich;V. Bansal;E. Barberio;P. Behera;B. Bhuyan;J. Biswal;A. Bozek;M. Bračko;T. E. Browder;D. Červenkov;P. Chang;V. Chekelian;A. Chen;B. G. Cheon;K. Chilikin;K. Cho;S.-K. Choi;Y. Choi;D. Cinabro;T. Czank;N. Dash;S. Di Carlo;Z. Doležal;Z. Drásal;D. Dutta;S. Eidelman;D. Epifanov;J. E. Fast;T. Ferber;B. G. Fulsom;V. Gaur;N. Gabyshev;A. Garmash;P. Goldenzweig;D. Greenwald;Y. Guan;E. Guido;J. Haba;K. Hayasaka;H. Hayashii;M. T. Hedges;S. Hirose;W.-S. Hou;C.-L. Hsu;T. Iijima;K. Inami;G. Inguglia;A. Ishikawa;R. Itoh;M. Iwasaki;W. W. Jacobs;I. Jaegle;H. B. Jeon;Y. Jin;K. K. Joo;T. Julius;J. Kahn;A. B. Kaliyar;K. H. Kang;G. Karyan;T. Kawasaki;C. Kiesling;D. Y. Kim;J. B. Kim;S. H. Kim;Y. J. Kim;K. Kinoshita;P. Kodyš;S. Korpar;D. Kotchetkov;P. Križan;P. Krokovny;T. Kuhr;R. Kulasiri;R. Kumar;A. Kuzmin;Y.-J. Kwon;J. S. Lange;I. S. Lee;C. H. Li;L. Li;L. Li Gioi;J. Libby;D. Liventsev;M. Lubej;T. Luo;M. Masuda;T. Matsuda;M. Merola;K. Miyabayashi;H. Miyata;R. Mizuk;G. B. Mohanty;H. K. Moon;T. Mori;R. Mussa;E. Nakano;M. Nakao;T. Nanut;K. J. Nath;Z. Natkaniec;M. Nayak;M. Niiyama;N. K. Nisar;S. Nishida;S. Ogawa;S. Okuno;H. Ono;P. Pakhlov;G. Pakhlova;B. Pal;C.-S. Park;H. Park;S. Paul;T. K. Pedlar;R. Pestotnik;L. E. Piilonen;M. Ritter;A. Rostomyan;M. Rozanska;Y. Sakai;M. Salehi;S. Sandilya;Y. Sato;V. Savinov;O. Schneider;G. Schnell;C. Schwanda;Y. Seino;K. Senyo;M. E. Sevior;V. Shebalin;C. P. Shen;T.-A. Shibata;J.-G. Shiu;F. Simon;A. Sokolov;E. Solovieva;M. Starič;J. F. Strube;J. Stypula;M. Sumihama;K. Sumisawa;T. Sumiyoshi;M. Takizawa;U. Tamponi;K. Tanida;F. Tenchini;K. Trabelsi;M. Uchida;S. Uehara;T. Uglov;Y. Unno;S. Uno;P. Urquijo;C. Van Hulse;G. Varner;V. Vorobyev;C. H. Wang;M.-Z. Wang;P. Wang;M. Watanabe;S. Watanuki;E. Widmann;E. Won;Y. Yamashita;H. Ye;J. Yelton;C. Z. Yuan;Y. Yusa;Z. P. Zhang;V. Zhilich;V. Zhukova;V. Zhulanov;A. Zupanc;The Belle Collaboration;
physical review letters 2018 Vol. 121 pp. 031801-
251
collaboration2018physicalsearch12

Abstract

We report the results of a search for the rare, purely leptonic decay B−→μ−ν¯μ performed with a 711 fb−1 data sample that contains 772×106 BB¯ pairs, collected near the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. The signal events are selected based on the presence of a high momentum muon and the topology of the rest of the event showing properties of a generic B-meson decay, as well as the missing energy and momentum being consistent with the hypothesis of a neutrino from the signal decay. We find a 2.4 standard deviation excess above background including systematic uncertainties, which corresponds to a branching fraction of B(B−→μ−ν¯μ)=(6.46±2.22±1.60)×10−7 or a frequentist 90% confidence level interval on the B−→μ−ν¯μ branching fraction of [2.9,10.7]×10−7.

Keywords

topology branching confidence resonance decay neutrino belle kekb

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DOI:
10.1103/physrevlett.121.031801
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https://sciprofiles.com/publication/view/a6eaed312...

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ID: 273336
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