Search for B+ →μ+νμ and B+ →μ+N with inclusive tagging

Belle Collaboration

doi:10.1103/PhysRevD.101.032007

Search for B+ →μ+νμ and B+ →μ+N with inclusive tagging

Belle Collaboration

Chair of Physics I

Yonsei University
Humanoid Technologies Lab (H2T)
University of Bonn
KEK and Graduate University for Advanced Studies (Sokendai)
High Energy Accelerator Research Organization (KEK)
Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences
University of Tokyo
Faculty of Sciences, King Abdulaziz University
University of Tabuk
Brookhaven National Laboratory
University of South Carolina
Budker Institute of Nuclear Physics (SB RAS)
Novosibirsk State University
Moscow Institute of Physics and Technology
Deutsches Elektronen-Synchrotron (DESY)
University of Sydney
Pacific Northwest National Laboratory
Indian Institute of Technology Madras
Georg August Universität Göttingen
Indian Institute of Science Education and Research Mohali
Indian Institute of Technology Guwahati
Charles University
Jožef Stefan Institute
University of Maribor
University of Hawaii
INFN Sezione di Napoli
Università di Napoli Federico II
National Taiwan University
Max-Planck-Institut für Physik
National Central University
Hanyang University
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
Korea Institute of Science and Technology Information
Sungkyunkwan University
Indian Institute of Technology Hyderabad
Wayne State University
Panjab University
Virginia Polytechnic Institute and State University
Univ. of Cincinnati
Niigata University
Nara Women's University
Nagoya University
Osaka Prefecture University
Beihang University
Kennesaw State University
Chonnam National University
Kitasato University
Soongsil University
Korea University
Univ. of Ljubljana
University of Mississippi
University of Munich
Punjab Agricultural University
Tokyo Metropolitan University
Malaviya National Institute of Technology Jaipur
Justus-Liebig-Universität Gießen
Seoul National University
Kyungpook National University
Liaoning Normal University
Fudan University
University of Miyazaki
Tata Institute of Fundamental Research, Mumbai
INFN Sez. di Torino
Kyoto University
University of Pittsburgh
Toho University
Nippon Dental University
National Research Nuclear University MEPhI
Luther College, Decorah
Forschungszentrum Jülich (FZJ)
EPFL
Biodonostia Health Research Institute-CIBERNED-UPV-EHU
Basque Foundation for Science
Österreichische Akademie der Wissenschaften
Yamagata University
School of Physics
Institute for High Energy Physics
Gifu University
Riken
Showa Pharmaceutical University
University of Florida
Laboratoire de l'Accélérateur Linéaire
Tokyo Institute of Technology
National United University Taiwan
Institute of High Energy Physics Chinese Academy of Science
Tohoku University
University of Science and Technology of China

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Abstract

We report the result for a search for the leptonic decay of B+→μ+νμ using the full Belle dataset of 711 fb-1 of integrated luminosity at the (4S) resonance. In the Standard Model leptonic B-meson decays are helicity and Cabibbo-Kobayashi-Maskawa suppressed. To maximize sensitivity an inclusive tagging approach is used to reconstruct the second B meson produced in the collision. The directional information from this second B meson is used to boost the observed μ into the signal B-meson rest frame, in which the μ has a monochromatic momentum spectrum. Though its momentum is smeared by the experimental resolution, this technique improves the analysis sensitivity considerably. Analyzing the μ momentum spectrum in this frame we find B(B+→μ+νμ)=(5.3±2.0±0.9)×10-7 with a one-sided significance of 2.8 standard deviations over the background-only hypothesis. This translates to a frequentist upper limit of B(B+→μ+νμ)<8.6×10-7 at 90% confidence level. The experimental spectrum is then used to search for a massive sterile neutrino, B+→μ+N, but no evidence is observed for a sterile neutrino with a mass in a range of 0-1.5 GeV. The determined B+→μ+νμ branching fraction limit is further used to constrain the mass and coupling space of the type II and type III two-Higgs-doublet models.

Original language	English
Article number	032007
Journal	Physical Review D
Volume	101
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevD.101.032007
State	Published - 1 Feb 2020

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10.1103/PhysRevD.101.032007

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@article{46b39001895141d781645ccc6672bb75,

title = "Search for B+ →μ+νμ and B+ →μ+N with inclusive tagging",

abstract = "We report the result for a search for the leptonic decay of B+→μ+νμ using the full Belle dataset of 711 fb-1 of integrated luminosity at the (4S) resonance. In the Standard Model leptonic B-meson decays are helicity and Cabibbo-Kobayashi-Maskawa suppressed. To maximize sensitivity an inclusive tagging approach is used to reconstruct the second B meson produced in the collision. The directional information from this second B meson is used to boost the observed μ into the signal B-meson rest frame, in which the μ has a monochromatic momentum spectrum. Though its momentum is smeared by the experimental resolution, this technique improves the analysis sensitivity considerably. Analyzing the μ momentum spectrum in this frame we find B(B+→μ+νμ)=(5.3±2.0±0.9)×10-7 with a one-sided significance of 2.8 standard deviations over the background-only hypothesis. This translates to a frequentist upper limit of B(B+→μ+νμ)<8.6×10-7 at 90\% confidence level. The experimental spectrum is then used to search for a massive sterile neutrino, B+→μ+N, but no evidence is observed for a sterile neutrino with a mass in a range of 0-1.5 GeV. The determined B+→μ+νμ branching fraction limit is further used to constrain the mass and coupling space of the type II and type III two-Higgs-doublet models.",

author = "\{Belle Collaboration\} and Prim, \{M. T.\} and Bernlochner, \{F. U.\} and P. Goldenzweig and M. Heck and I. Adachi and K. Adamczyk and H. Aihara and \{Al Said\}, S. and Asner, \{D. M.\} and H. Atmacan and V. Aulchenko and T. Aushev and R. Ayad and V. Babu and Bakich, \{A. M.\} and V. Bansal and P. Behera and C. Bele{\~n}o and V. Bhardwaj and B. Bhuyan and T. Bilka and J. Biswal and A. Bobrov and A. Bozek and M. Bra{\v c}ko and N. Braun and Browder, \{T. E.\} and M. Campajola and L. Cao and D. {\v C}ervenkov and P. Chang and V. Chekelian and A. Chen and Cheon, \{B. G.\} and K. Chilikin and Cho, \{H. E.\} and K. Cho and Y. Choi and S. Choudhury and D. Cinabro and S. Cunliffe and Z. Dole{\v Z}al and S. Eidelman and D. Epifanov and Fast, \{J. E.\} and T. Ferber and Fulsom, \{B. G.\} and R. Garg and V. Gaur and S. Paul",

note = "Publisher Copyright: {\textcopyright} 2020 authors. Published by the American Physical Society.",

year = "2020",

month = feb,

day = "1",

doi = "10.1103/PhysRevD.101.032007",

language = "English",

volume = "101",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "American Physical Society",

number = "3",

}

TY - JOUR

T1 - Search for B+ →μ+νμ and B+ →μ+N with inclusive tagging

AU - Belle Collaboration

AU - Prim, M. T.

AU - Bernlochner, F. U.

AU - Goldenzweig, P.

AU - Heck, M.

AU - Adachi, I.

AU - Adamczyk, K.

AU - Aihara, H.

AU - Al Said, S.

AU - Asner, D. M.

AU - Atmacan, H.

AU - Aulchenko, V.

AU - Aushev, T.

AU - Ayad, R.

AU - Babu, V.

AU - Bakich, A. M.

AU - Bansal, V.

AU - Behera, P.

AU - Beleño, C.

AU - Bhardwaj, V.

AU - Bhuyan, B.

AU - Bilka, T.

AU - Biswal, J.

AU - Bobrov, A.

AU - Bozek, A.

AU - Bračko, M.

AU - Braun, N.

AU - Browder, T. E.

AU - Campajola, M.

AU - Cao, L.

AU - Červenkov, D.

AU - Chang, P.

AU - Chekelian, V.

AU - Chen, A.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Cho, H. E.

AU - Cho, K.

AU - Choi, Y.

AU - Choudhury, S.

AU - Cinabro, D.

AU - Cunliffe, S.

AU - DoleŽal, Z.

AU - Eidelman, S.

AU - Epifanov, D.

AU - Fast, J. E.

AU - Ferber, T.

AU - Fulsom, B. G.

AU - Garg, R.

AU - Gaur, V.

AU - Paul, S.

PY - 2020/2/1

Y1 - 2020/2/1

N2 - We report the result for a search for the leptonic decay of B+→μ+νμ using the full Belle dataset of 711 fb-1 of integrated luminosity at the (4S) resonance. In the Standard Model leptonic B-meson decays are helicity and Cabibbo-Kobayashi-Maskawa suppressed. To maximize sensitivity an inclusive tagging approach is used to reconstruct the second B meson produced in the collision. The directional information from this second B meson is used to boost the observed μ into the signal B-meson rest frame, in which the μ has a monochromatic momentum spectrum. Though its momentum is smeared by the experimental resolution, this technique improves the analysis sensitivity considerably. Analyzing the μ momentum spectrum in this frame we find B(B+→μ+νμ)=(5.3±2.0±0.9)×10-7 with a one-sided significance of 2.8 standard deviations over the background-only hypothesis. This translates to a frequentist upper limit of B(B+→μ+νμ)<8.6×10-7 at 90% confidence level. The experimental spectrum is then used to search for a massive sterile neutrino, B+→μ+N, but no evidence is observed for a sterile neutrino with a mass in a range of 0-1.5 GeV. The determined B+→μ+νμ branching fraction limit is further used to constrain the mass and coupling space of the type II and type III two-Higgs-doublet models.

AB - We report the result for a search for the leptonic decay of B+→μ+νμ using the full Belle dataset of 711 fb-1 of integrated luminosity at the (4S) resonance. In the Standard Model leptonic B-meson decays are helicity and Cabibbo-Kobayashi-Maskawa suppressed. To maximize sensitivity an inclusive tagging approach is used to reconstruct the second B meson produced in the collision. The directional information from this second B meson is used to boost the observed μ into the signal B-meson rest frame, in which the μ has a monochromatic momentum spectrum. Though its momentum is smeared by the experimental resolution, this technique improves the analysis sensitivity considerably. Analyzing the μ momentum spectrum in this frame we find B(B+→μ+νμ)=(5.3±2.0±0.9)×10-7 with a one-sided significance of 2.8 standard deviations over the background-only hypothesis. This translates to a frequentist upper limit of B(B+→μ+νμ)<8.6×10-7 at 90% confidence level. The experimental spectrum is then used to search for a massive sterile neutrino, B+→μ+N, but no evidence is observed for a sterile neutrino with a mass in a range of 0-1.5 GeV. The determined B+→μ+νμ branching fraction limit is further used to constrain the mass and coupling space of the type II and type III two-Higgs-doublet models.

UR - https://www.scopus.com/pages/publications/85126566241

U2 - 10.1103/PhysRevD.101.032007

DO - 10.1103/PhysRevD.101.032007

M3 - Article

AN - SCOPUS:85126566241

SN - 2470-0010

VL - 101

JO - Physical Review D

JF - Physical Review D

IS - 3

M1 - 032007

ER -

Search for B+ →μ+νμ and B+ →μ+N with inclusive tagging

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