Search for the rare decay of B++νγ with improved hadronic tagging

Gelb, M. (Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe) ; Bernlochner, F. U. (Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe) ; Goldenzweig, P. (Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe) ; Metzner, F. (Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe) ; Adachi, I. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) (SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193) ; Aihara, H. (Department of Physics, University of Tokyo, Tokyo 113-0033) ; Al Said, S. (Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451) (Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589) ; Asner, D. M. (Brookhaven National Laboratory, Upton, New York 11973) ; Atmacan, H. (University of South Carolina, Columbia, South Carolina 29208) ; Aushev, T. (Moscow Institute of Physics and Technology, Moscow Region 141700) ; Ayad, R. (Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451) ; Babu, V. (Tata Institute of Fundamental Research, Mumbai 400005) ; Badhrees, I. (Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451) (King Abdulaziz City for Science and Technology, Riyadh 11442) ; Bansal, V. (Pacific Northwest National Laboratory, Richland, Washington 99352) ; Behera, P. (Indian Institute of Technology Madras, Chennai 600036) ; Beleño, C. (II. Physikalisches Institut, Georg-August-Universität Göttingen, 37073 Göttingen) ; Bhuyan, B. (Indian Institute of Technology Guwahati, Assam 781039) ; Biswal, J. (J. Stefan Institute, 1000 Ljubljana) ; Bobrov, A. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) ; Bračko, M. (University of Maribor, 2000 Maribor) (J. Stefan Institute, 1000 Ljubljana) ; Braun, N. (Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe) ; Cao, L. (Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe) ; Červenkov, D. (Faculty of Mathematics and Physics, Charles University, 121 16 Prague) ; Chekelian, V. (Max-Planck-Institut für Physik, 80805 München) ; Chen, A. (National Central University, Chung-li 32054) ; Cheon, B. G. (Hanyang University, Seoul 133-791) ; Chilikin, K. (P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991) ; Cho, K. (Korea Institute of Science and Technology Information, Daejeon 305-806) ; Choi, S.K. (Gyeongsang National University, Chinju 660-701) ; Choi, Y. (Sungkyunkwan University, Suwon 440-746) ; Choudhury, S. (Indian Institute of Technology Hyderabad, Telangana 502285) ; Cinabro, D. (Wayne State University, Detroit, Michigan 48202) ; Cunliffe, S. (Deutsches Elektronen–Synchrotron, 22607 Hamburg) ; Dash, N. (Indian Institute of Technology Bhubaneswar, Satya Nagar 751007) ; Di Carlo, S. (LAL, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay) ; Doležal, Z. (Faculty of Mathematics and Physics, Charles University, 121 16 Prague) ; Dong, T. V. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) (SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193) ; Eidelman, S. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) (P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991) ; Epifanov, D. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) ; Fast, J. E. (Pacific Northwest National Laboratory, Richland, Washington 99352) ; Ferber, T. (Deutsches Elektronen–Synchrotron, 22607 Hamburg) ; Frey, A. (II. Physikalisches Institut, Georg-August-Universität Göttingen, 37073 Göttingen) ; Fulsom, B. G. (Pacific Northwest National Laboratory, Richland, Washington 99352) ; Garg, R. (Panjab University, Chandigarh 160014) ; Gaur, V. (Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061) ; Gabyshev, N. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) ; Garmash, A. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) ; Gemmler, J. (Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe) ; Giri, A. (Indian Institute of Technology Hyderabad, Telangana 502285) ; Greenwald, D. (Department of Physics, Technische Universität München, 85748 Garching) ; Haba, J. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) (SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193) ; Hara, T. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) (SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193) ; Hayasaka, K. (Niigata University, Niigata 950-2181) ; Hayashii, H. (Nara Women’s University, Nara 630-8506) ; Hou, W.S. (Department of Physics, National Taiwan University, Taipei 10617) ; Inami, K. (Graduate School of Science, Nagoya University, Nagoya 464-8602) ; Inguglia, G. (Deutsches Elektronen–Synchrotron, 22607 Hamburg) ; Ishikawa, A. (Department of Physics, Tohoku University, Sendai 980-8578) ; Itoh, R. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) (SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193) ; Iwasaki, M. (Osaka City University, Osaka 558-8585) ; Iwasaki, Y. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) ; Jacobs, W. W. (Indiana University, Bloomington, Indiana 47408) ; Jia, S. (Beihang University, Beijing 100191) ; Jin, Y. (Department of Physics, University of Tokyo, Tokyo 113-0033) ; Joffe, D. (Kennesaw State University, Kennesaw, Georgia 30144) ; Joo, K. K. (Chonnam National University, Kwangju 660-701) ; Kahn, J. (Ludwig Maximilians University, 80539 Munich) ; Kaliyar, A. B. (Indian Institute of Technology Madras, Chennai 600036) ; Kawasaki, T. (Kitasato University, Sagamihara 252-0373) ; Kichimi, H. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) ; Kiesling, C. (Max-Planck-Institut für Physik, 80805 München) ; Kim, D. Y. (Soongsil University, Seoul 156-743) ; Kim, H. J. (Kyungpook National University, Daegu 702-701) ; Kim, S. H. (Hanyang University, Seoul 133-791) ; Kodyš, P. (Faculty of Mathematics and Physics, Charles University, 121 16 Prague) ; Korpar, S. (University of Maribor, 2000 Maribor) (J. Stefan Institute, 1000 Ljubljana) ; Kotchetkov, D. (University of Hawaii, Honolulu, Hawaii 96822) ; Križan, P. (Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana) (J. Stefan Institute, 1000 Ljubljana) ; Kroeger, R. (University of Mississippi, University, Mississippi 38677) ; Krokovny, P. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) ; Kuhr, T. (Ludwig Maximilians University, 80539 Munich) ; Kulasiri, R. (Kennesaw State University, Kennesaw, Georgia 30144) ; Kuzmin, A. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) ; Kwon, Y.J. (Yonsei University, Seoul 120-749) ; Lange, J. S. (Justus-Liebig-Universität Gießen, 35392 Gießen) ; Lee, I. S. (Hanyang University, Seoul 133-791) ; Lee, J. K. (Seoul National University, Seoul 151-742) ; Lee, J. Y. (Seoul National University, Seoul 151-742) ; Lee, S. C. (Kyungpook National University, Daegu 702-701) ; Li, Y. B. (Peking University, Beijing 100871) ; Li Gioi, L. (Max-Planck-Institut für Physik, 80805 München) ; Libby, J. (Indian Institute of Technology Madras, Chennai 600036) ; Liventsev, D. (Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061) (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) ; Lu, P.C. (Department of Physics, National Taiwan University, Taipei 10617) ; Lubej, M. (J. Stefan Institute, 1000 Ljubljana) ; Luo, T. (Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443) ; MacNaughton, J. (University of Miyazaki, Miyazaki 889-2192) ; Masuda, M. (Earthquake Research Institute, University of Tokyo, Tokyo 113-0032) ; Merola, M. (INFN - Sezione di Napoli, 80126 Napoli) (Università di Napoli Federico II, 80055 Napoli) ; Miyabayashi, K. (Nara Women’s University, Nara 630-8506) ; Miyata, H. (Niigata University, Niigata 950-2181) ; Mizuk, R. (P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991) (Moscow Physical Engineering Institute, Moscow 115409) (Moscow Institute of Physics and Technology, Moscow Region 141700) ; Mohanty, G. B. (Tata Institute of Fundamental Research, Mumbai 400005) ; Mori, T. (Graduate School of Science, Nagoya University, Nagoya 464-8602) ; Mrvar, M. (J. Stefan Institute, 1000 Ljubljana) ; Mussa, R. (INFN - Sezione di Torino, 10125 Torino) ; Nakao, M. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) (SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193) ; Nath, K. J. (Indian Institute of Technology Guwahati, Assam 781039) ; Natkaniec, Z. (H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342) ; Nayak, M. (Wayne State University, Detroit, Michigan 48202) (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) ; Niiyama, M. (Kyoto University, Kyoto 606-8502) ; Nisar, N. K. (University of Pittsburgh, Pittsburgh, Pennsylvania 15260) ; Nishida, S. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) (SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193) ; Ogawa, S. (Toho University, Funabashi 274-8510) ; Pakhlov, P. (P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991) (Moscow Physical Engineering Institute, Moscow 115409) ; Pakhlova, G. (P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991) (Moscow Institute of Physics and Technology, Moscow Region 141700) ; Pal, B. (Brookhaven National Laboratory, Upton, New York 11973) ; Pardi, S. (INFN - Sezione di Napoli, 80126 Napoli) ; Paul, S. (Department of Physics, Technische Universität München, 85748 Garching) ; Pedlar, T. K. (Luther College, Decorah, Iowa 52101) ; Pestotnik, R. (J. Stefan Institute, 1000 Ljubljana) ; Piilonen, L. E. (Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061) ; Popov, V. (P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991) (Moscow Institute of Physics and Technology, Moscow Region 141700) ; Prencipe, E. (Forschungszentrum Jülich, 52425 Jülich) ; Prim, M. (Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe) ; Ritter, M. (Ludwig Maximilians University, 80539 Munich) ; Rostomyan, A. (Deutsches Elektronen–Synchrotron, 22607 Hamburg) ; Russo, G. (INFN - Sezione di Napoli, 80126 Napoli) ; Sahoo, D. (Tata Institute of Fundamental Research, Mumbai 400005) ; Sakai, Y. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) (SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193) ; Salehi, M. (University of Malaya, 50603 Kuala Lumpur) (Ludwig Maximilians University, 80539 Munich) ; Sandilya, S. (University of Cincinnati, Cincinnati, Ohio 45221) ; Santelj, L. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) ; Sanuki, T. (Department of Physics, Tohoku University, Sendai 980-8578) ; Savinov, V. (University of Pittsburgh, Pittsburgh, Pennsylvania 15260) ; Schneider, O. (École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015) ; Schnell, G. (University of the Basque Country UPV/EHU, 48080 Bilbao) (IKERBASQUE, Basque Foundation for Science, 48013 Bilbao) ; Schueler, J. (University of Hawaii, Honolulu, Hawaii 96822) ; Schwanda, C. (Institute of High Energy Physics, Vienna 1050) ; Seino, Y. (Niigata University, Niigata 950-2181) ; Senyo, K. (Yamagata University, Yamagata 990-8560) ; Seon, O. (Graduate School of Science, Nagoya University, Nagoya 464-8602) ; Sevior, M. E. (School of Physics, University of Melbourne, Victoria 3010) ; Shen, C. P. (Beihang University, Beijing 100191) ; Shibata, T.A. (Tokyo Institute of Technology, Tokyo 152-8550) ; Shiu, J.G. (Department of Physics, National Taiwan University, Taipei 10617) ; Shwartz, B. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) ; Simon, F. (Max-Planck-Institut für Physik, 80805 München) ; Solovieva, E. (P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991) (Moscow Institute of Physics and Technology, Moscow Region 141700) ; Stanič, S. (University of Nova Gorica, 5000 Nova Gorica) ; Starič, M. (J. Stefan Institute, 1000 Ljubljana) ; Strube, J. F. (Pacific Northwest National Laboratory, Richland, Washington 99352) ; Sumihama, M. (Gifu University, Gifu 501-1193) ; Sumiyoshi, T. (Tokyo Metropolitan University, Tokyo 192-0397) ; Sutcliffe, W. (Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe) ; Takizawa, M. (Showa Pharmaceutical University, Tokyo 194-8543) (J-PARC Branch, KEK Theory Center, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) (Theoretical Research Division, Nishina Center, RIKEN, Saitama 351-0198) ; Tanida, K. (Advanced Science Research Center, Japan Atomic Energy Agency, Naka 319-1195) ; Tao, Y. (University of Florida, Gainesville, Florida 32611) ; Tenchini, F. (Deutsches Elektronen–Synchrotron, 22607 Hamburg) ; Uchida, M. (Tokyo Institute of Technology, Tokyo 152-8550) ; Uglov, T. (P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991) (Moscow Institute of Physics and Technology, Moscow Region 141700) ; Unno, Y. (Hanyang University, Seoul 133-791) ; Uno, S. (High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801) (SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193) ; Urquijo, P. (School of Physics, University of Melbourne, Victoria 3010) ; Van Tonder, R. (Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe) ; Varner, G. (University of Hawaii, Honolulu, Hawaii 96822) ; Varvell, K. E. (School of Physics, University of Sydney, New South Wales 2006) ; Wang, B. (University of Cincinnati, Cincinnati, Ohio 45221) ; Wang, C. H. (National United University, Miao Li 36003) ; Wang, M.Z. (Department of Physics, National Taiwan University, Taipei 10617) ; Wang, P. (Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049) ; Wang, X. L. (Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics, Fudan University, Shanghai 200443) ; Watanabe, M. (Niigata University, Niigata 950-2181) ; Watanuki, S. (Department of Physics, Tohoku University, Sendai 980-8578) ; Widmann, E. (Stefan Meyer Institute for Subatomic Physics, Vienna 1090) ; Won, E. (Korea University, Seoul 136-713) ; Yamamoto, H. (Department of Physics, Tohoku University, Sendai 980-8578) ; Yang, S. B. (Korea University, Seoul 136-713) ; Ye, H. (Deutsches Elektronen–Synchrotron, 22607 Hamburg) ; Yin, J. H. (Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049) ; Yuan, C. Z. (Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049) ; Yusa, Y. (Niigata University, Niigata 950-2181) ; Zakharov, S. (P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991) (Moscow Institute of Physics and Technology, Moscow Region 141700) ; Zhang, Z. P. (University of Science and Technology of China, Hefei 230026) ; Zhilich, V. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090) ; Zhukova, V. (P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Moscow 119991) ; Zhulanov, V. (Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090) (Novosibirsk State University, Novosibirsk 630090)

28 December 2018

Abstract: We present the result of the search for the rare B meson decay of B++νγ with =e,μ. For the search the full data set recorded by the Belle experiment of 711 fb1 integrated luminosity near the ϒ(4S) resonance is used. Signal candidates are reconstructed for photon energies Eγ larger than 1 GeV using a novel multivariate tagging algorithm. The novel algorithm fully reconstructs the second B meson produced in the collision using hadronic modes and was specifically trained to recognize the signal signature in combination with hadronic tag-side B meson decays. This approach greatly enhances the performance. Background processes that can mimic this signature, mainly charmless semileptonic decays and continuum processes, are suppressed using multivariate methods. The number of signal candidates is determined by analyzing the missing mass squared distribution as inferred from the signal side particles and the kinematic properties of the tag-side B meson. No significant excess over the background-only hypothesis is observed and upper limits on the partial branching fraction ΔB with Eγ>1 GeV individually for electron and muon final states as well as for the average branching fraction of both lepton final states are reported. We find a Bayesian upper limit of ΔB(B++νγ)<3.0×106 at 90% CL and also report an upper limit on the first inverse moment of the light-cone distribution amplitude of the B meson of λB>0.24 GeV at 90% CL.


Published in: Physical Review D 98 (2018)
Published by: APS
DOI: 10.1103/PhysRevD.98.112016
arXiv: 1810.12976
License: CC-BY-4.0



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