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Search for B0 decays to invisible final states (+γ) at Belle

Physical Review D 2020年第1期102卷 012003-012003页

作者： Y. Ku P. Chang I. Adachi K. Adamczyk H. Aihara D. M. Asner T. Aushev R. Ayad P. Behera C. Beleño J. Bennett V. Bhardwaj T. Bilka J. Biswal G. Bonvicini A. Bozek M. Bračko M.-C. Chang V. Chekelian K. Chilikin K. Cho S.-K. Choi Y. Choi D. Cinabro S. Cunliffe N. Dash G. De Nardo T. V. Dong S. Eidelman D. Epifanov J. E. Fast B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash P. Goldenzweig O. Grzymkowska Y. Guan O. Hartbrich K. Hayasaka H. Hayashii M. Hernandez Villanueva T. Higuchi W.-S. Hou C.-L. Hsu K. Huang K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki S. Jia Y. Jin K. H. Kang T. Kawasaki H. Kichimi C. Kiesling C. H. Kim D. Y. Kim T. D. Kimmel K. Kinoshita P. Kodyš S. Korpar P. Križan R. Kroeger P. Krokovny T. Kuhr R. Kulasiri R. Kumar Y.-J. Kwon Y.-T. Lai Y. B. Li L. Li Gioi J. Libby K. Lieret C. MacQueen D. Matvienko M. Merola R. Mizuk G. B. Mohanty T. J. Moon T. Mori R. Mussa Z. Natkaniec M. Nayak N. K. Nisar S. Nishida K. Nishimura K. Ogawa S. Ogawa H. Ono P. Oskin P. Pakhlov G. Pakhlova H. Park S.-H. Park S. Patra T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik V. Popov M. T. Prim M. Ritter M. Röhrken A. Rostomyan N. Rout G. Russo Y. Sakai L. Santelj T. Sanuki V. Savinov G. Schnell J. Schueler C. Schwanda A. J. Schwartz K. Senyo M. Shapkin J.-G. Shiu B. Shwartz A. Sokolov E. Solovieva M. Starič Z. S. Stottler M. Sumihama T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida F. Tenchini K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov G. Varner K. E. Varvell A. Vinokurova C. H. Wang E. Wang M.-Z. Wang P. Wang X. L. Wang M. Watanabe E. Won X. Xu S. B. Yang H. Ye C. Z. Yuan Z. P. Zhang V. Zhukova Department of Physics National Taiwan University Taipei 10617 High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 Department of Physics University of Tokyo Tokyo 113-0033 Brookhaven National Laboratory Upton New York 11973 Higher School of Economics (HSE) Moscow 101000 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Indian Institute of Technology Madras Chennai 600036 II. Physikalisches Institut Georg-August-Universität Göttingen 37073 Göttingen University of Mississippi University Mississippi 38677 Indian Institute of Science Education and Research Mohali SAS Nagar 140306 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana Wayne State University Detroit Michigan 48202 University of Maribor 2000 Maribor Department of Physics Fu Jen Catholic University Taipei 24205 Max-Planck-Institut für Physik 80805 München P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Korea Institute of Science and Technology Information Daejeon 34141 Gyeongsang National University Jinju 52828 Sungkyunkwan University Suwon 16419 Deutsches Elektronen–Synchrotron 22607 Hamburg Indian Institute of Technology Bhubaneswar Satya Nagar 751007 INFN—Sezione di Napoli 80126 Napoli Università di Napoli Federico II 80055 Napoli Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics Fudan University Shanghai 200443 Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 Pacific Northwest National Laboratory Richland Washington 99352 Panjab University Chandigarh 160014 Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe University of Cincinna

We report searches for B0→invisible and B0→invisible+γ decays, where the energy of the photon is required to be larger than 0.5 GeV. These results are obtained from a 711 fb−1 data sample that contains 772×106BB¯ pairs and was collected near the ϒ(4S) resonance with the Belle detector at the KEKB e+e− collider. We observe no significant signal for either decay and set upper limits on their branching fractions at 90% confidence level of B(B0→invisible)<7.8×10−5 and B(B0→invisible+γ)<1.6×10−5.

关键词： Invisible decays Particle dark matter Supersymmetric models

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Measurement of the branching fraction of the decay B+→π+π−ℓ+νℓ in fully reconstructed events at Belle

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Physical Review D 2021年第11期103卷 112001-112001页

作者： C. Beleño A. Frey I. Adachi H. Aihara D. M. Asner H. Atmacan T. Aushev R. Ayad P. Behera J. Bennett F. Bernlochner V. Bhardwaj T. Bilka J. Biswal G. Bonvicini A. Bozek M. Bračko T. E. Browder M. Campajola D. Červenkov P. Chang A. Chen K. Chilikin K. Cho Y. Choi D. Cinabro S. Cunliffe N. Dash F. Di Capua J. Dingfelder Z. Doležal T. V. Dong S. Eidelman D. Epifanov J. E. Fast T. Ferber B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig Y. Guan O. Hartbrich K. Hayasaka H. Hayashii W.-S. Hou K. Inami A. Ishikawa M. Iwasaki W. W. Jacobs H. B. Jeon Y. Jin K. K. Joo C. Kiesling B. H. Kim D. Y. Kim K.-H. Kim S. H. Kim Y.-K. Kim T. D. Kimmel K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan R. Kroeger P. Krokovny T. Kuhr R. Kulasiri R. Kumar A. Kuzmin Y.-J. Kwon K. Lalwani S. C. Lee L. K. Li Y. B. Li L. Li Gioi J. Libby K. Lieret D. Liventsev T. Luo J. MacNaughton C. MacQueen M. Masuda T. Matsuda M. Merola K. Miyabayashi G. B. Mohanty T. J. Moon T. Mori M. Mrvar M. Nakao N. K. Nisar S. Nishida S. Ogawa H. Ono P. Oskin P. Pakhlov G. Pakhlova S. Pardi H. Park S. Patra T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik E. Prencipe M. T. Prim A. Rostomyan N. Rout G. Russo D. Sahoo Y. Sakai S. Sandilya A. Sangal T. Sanuki V. Savinov G. Schnell C. Schwanda A. J. Schwartz B. Schwenker Y. Seino K. Senyo M. E. Sevior M. Shapkin J.-G. Shiu B. Shwartz A. Sokolov E. Solovieva M. Starič Z. S. Stottler J. F. Strube T. Sumiyoshi W. Sutcliffe M. Takizawa K. Tanida F. Tenchini M. Uchida T. Uglov S. Uno P. Urquijo S. E. Vahsen R. Van Tonder G. Varner K. E. Varvell C. H. Wang E. Wang M.-Z. Wang P. Wang X. L. Wang M. Watanabe E. Won X. Xu W. Yan S. B. Yang H. Ye Y. Yusa Z. P. Zhang V. Zhilich V. Zhukova II. Physikalisches Institut Georg-August-Universität Göttingen 37073 Göttingen High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Department of Physics University of Tokyo Tokyo 113-0033 Brookhaven National Laboratory Upton New York 11973 University of Cincinnati Cincinnati Ohio 45221 Higher School of Economics (HSE) Moscow 101000 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Indian Institute of Technology Madras Chennai 600036 University of Mississippi University Mississippi 38677 University of Bonn 53115 Bonn Indian Institute of Science Education and Research Mohali SAS Nagar 140306 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana Wayne State University Detroit Michigan 48202 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 University of Maribor 2000 Maribor University of Hawaii Honolulu Hawaii 96822 INFN—Sezione di Napoli 80126 Napoli Università di Napoli Federico II 80055 Napoli Department of Physics National Taiwan University Taipei 10617 National Central University Chung-li 32054 P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Korea Institute of Science and Technology Information Daejeon 34141 Sungkyunkwan University Suwon 16419 Deutsches Elektronen–Synchrotron 22607 Hamburg Indian Institute of Technology Bhubaneswar Satya Nagar 751007 Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics Fudan University Shanghai 200443 Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 Pacific Northwest National Laboratory Richland Washington 99352 Panjab University Chandigarh 160014 Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 Indian Institute of Technology Hyderabad Telangana 502285 Institut für Experimentelle Teilchenphysik

We present an analysis of the exclusive B+→π+π−ℓ+νℓ decay, where ℓ represents an electron or a muon, with the assumption of charge-conjugation symmetry and lepton universality. The study exploits the full ϒ(4S) data sample collected by the Belle detector, corresponding to 711 fb−1 of integrated luminosity. Events are selected by fully reconstructing one B meson in hadronic decay modes, subsequently determining the properties of the other B meson. We extract the signal yields using a binned maximum-likelihood fit to the missing-mass squared distribution in bins of the invariant mass of the two pions or the momentum transfer squared. We measure a total branching fraction of B(B+→π+π−ℓ+νℓ)=[22.7−1.6+1.9(stat)±3.5(syst)]×10−5, where the uncertainties are statistical and systematic, respectively. This result is the first reported measurement of this decay.

关键词： Particle decays Bottom quark Mesons Lepton colliders Particle data analysis Precision measurements

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Measurement of the resonant and nonresonant branching ratios in Ξc0→Ξ0K+K−

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Physical Review D 2021年第11期103卷 112002-112002页

作者： J. T. McNeil J. Yelton J. Bennett I. Adachi K. Adamczyk J. K. Ahn H. Aihara S. Al Said D. M. Asner H. Atmacan V. Aulchenko T. Aushev R. Ayad V. Babu S. Bahinipati P. Behera M. Bessner T. Bilka J. Biswal A. Bobrov G. Bonvicini A. Bozek M. Bračko T. E. Browder M. Campajola L. Cao D. Červenkov P. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin K. Cho S.-J. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe S. Das N. Dash G. De Nardo R. Dhamija F. Di Capua Z. Doležal T. V. Dong S. Eidelman T. Ferber B. G. Fulsom V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig B. Golob O. Grzymkowska Y. Guan K. Gudkova C. Hadjivasiliou K. Hayasaka H. Hayashii W.-S. Hou C.-L. Hsu K. Huang K. Inami A. Ishikawa R. Itoh M. Iwasaki W. W. Jacobs H. B. Jeon S. Jia Y. Jin K. K. Joo A. B. Kaliyar K. H. Kang G. Karyan H. Kichimi B. H. Kim C. H. Kim D. Y. Kim S. H. Kim Y.-K. Kim K. Kinoshita P. Kodyš T. Konno S. Korpar P. Križan R. Kroeger P. Krokovny T. Kuhr R. Kulasiri M. Kumar K. Kumara Y.-J. Kwon K. Lalwani S. C. Lee J. Li L. K. Li Y. B. Li L. Li Gioi J. Libby K. Lieret Z. Liptak D. Liventsev C. MacQueen M. Masuda T. Matsuda D. Matvienko M. Merola F. Metzner K. Miyabayashi R. Mizuk G. B. Mohanty S. Mohanty T. J. Moon R. Mussa M. Nakao A. Natochii L. Nayak M. Nayak M. Niiyama N. K. Nisar S. Nishida K. Ogawa S. Ogawa H. Ono Y. Onuki P. Oskin G. Pakhlova S. Pardi H. Park S.-H. Park S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik V. Popov E. Prencipe M. T. Prim M. Röhrken A. Rostomyan N. Rout G. Russo D. Sahoo Y. Sakai S. Sandilya A. Sangal L. Santelj V. Savinov G. Schnell J. Schueler C. Schwanda Y. Seino K. Senyo M. E. Sevior M. Shapkin C. Sharma V. Shebalin J.-G. Shiu F. Simon E. Solovieva M. Starič Z. S. Stottler J. F. Strube M. Sumihama T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida Y. Tao F. Tenchini M. Uchida S. Uehara Y. Unno S. Uno R. Van Tonder G. Varner A. Vinokurova V. Vorobyev C. H. Wang E. Wang M.-Z. Wang P. Wang M. Watanabe S. Watanuki E. Won X. Xu B. D. Yabsley W. Yan H. Ye J. H. Yin Z. P. Zhang V. Zhi University of Florida Gainesville Florida 32611 USA University of Mississippi University Mississippi 38677 USA High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 Japan SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Japan H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 Poland Korea University Seoul 02841 South Korea Department of Physics University of Tokyo Tokyo 113-0033 Japan Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Saudi Arabia Department of Physics Faculty of Science King Abdulaziz University Jeddah 21589 Saudi Arabia Brookhaven National Laboratory Upton New York 11973 USA University of Cincinnati Cincinnati Ohio 45221 USA Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Russia Novosibirsk State University Novosibirsk 630090 Russia Higher School of Economics (HSE) Moscow 101000 Russia Deutsches Elektronen–Synchrotron 22607 Hamburg Germany Indian Institute of Technology Bhubaneswar Satya Nagar 751007 India Indian Institute of Technology Madras Chennai 600036 India University of Hawaii Honolulu Hawaii 96822 USA Faculty of Mathematics and Physics Charles University 121 16 Prague Czech Republic J. Stefan Institute 1000 Ljubljana Slovenia Wayne State University Detroit Michigan 48202 USA University of Maribor 2000 Maribor Slovenia INFN—Sezione di Napoli 80126 Napoli Italy Università di Napoli Federico II 80126 Napoli Italy University of Bonn 53115 Bonn Germany Department of Physics National Taiwan University Taipei 10617 Taiwan Max-Planck-Institut für Physik 80805 München Germany National Central University Chung-li 32054 Taiwan Department of Physics and Institute of Natural Sciences Hanyang University Seoul 04763 South Korea P. N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Russia Korea Institute of Science and Technology Information Daejeon 34141 South Korea Yonsei University Seoul 03722 South Korea Gyeon

Using the entire data sample of 980 fb−1 integrated luminosity collected with the Belle detector at the KEKB asymmetric-energy e+e− collider, we present an amplitude analysis measuring the branching fractions of the Cabibbo-allowed, W-exchange resonant decay Ξc0→Ξ0ϕ(→K+K−) with a polarized ϕ and the nonresonant decay via a direct process Ξc0→Ξ0K+K−. We present these measurements, relative to the normalization mode Ξ−π+, and find branching ratios B(Ξc0→Ξ0ϕ(→K+K−))(BΞc0→Ξ−π+)=0.036±0.004(stat.)±0.002(syst.) and B(Ξc0→Ξ0K+K−)B(Ξc0→Ξ−π+)=0.039±0.004(stat.)±0.002(syst.), which suggest that only minor cusping peaks occur in the combinatorial background of Ω*−→Ξ0K− due to these Ξc0 decays.

关键词： Particle decays Particle interactions W & Z bosons

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Observation of a vector charmoniumlike state in e+e−→Ds+Ds1(2536)−+c.c.

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Physical Review D 2019年第11期100卷 111103(R)-111103(R)页

作者： S. Jia C. P. Shen C. Z. Yuan X. L. Wang I. Adachi H. Aihara D. M. Asner H. Atmacan V. Aulchenko R. Ayad V. Babu I. Badhrees A. M. Bakich P. Behera B. Bhuyan T. Bilka J. Biswal A. Bobrov G. Bonvicini A. Bozek M. Bračko T. E. Browder M. Campajola L. Cao D. Červenkov P. Chang A. Chen B. G. Cheon K. Chilikin H. E. Cho K. Cho S.-K. Choi Y. Choi D. Cinabro S. Cunliffe G. De Nardo F. Di Capua S. Di Carlo Z. Doležal T. V. Dong S. Eidelman D. Epifanov J. E. Fast T. Ferber B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig B. Golob K. Hayasaka H. Hayashii W.-S. Hou C.-L. Hsu T. Iijima K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs Y. Jin K. K. Joo K. H. Kang G. Karyan H. Kichimi B. H. Kim C. H. Kim D. Y. Kim S. H. Kim K. Kinoshita P. Kodyš S. Korpar R. Kroeger P. Krokovny R. Kulasiri A. Kuzmin Y.-J. Kwon K. Lalwani J. S. Lange I. S. Lee S. C. Lee P. Lewis C. H. Li L. K. Li Y. B. Li L. Li Gioi J. Libby K. Lieret D. Liventsev C. MacQueen M. Masuda T. Matsuda D. Matvienko M. Merola K. Miyabayashi H. Miyata R. Mizuk R. Mussa K. J. Nath M. Nayak M. Niiyama N. K. Nisar S. Nishida K. Nishimura S. Ogawa H. Ono Y. Onuki P. Oskin P. Pakhlov G. Pakhlova T. Pang S. Pardi H. Park S.-H. Park S. Patra S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen V. Popov E. Prencipe M. T. Prim M. Röhrken A. Rostomyan N. Rout G. Russo D. Sahoo Y. Sakai S. Sandilya L. Santelj V. Savinov O. Schneider G. Schnell C. Schwanda Y. Seino K. Senyo M. E. Sevior J.-G. Shiu B. Shwartz A. Sokolov E. Solovieva S. Stanič M. Starič Z. S. Stottler T. Sumiyoshi W. Sutcliffe M. Takizawa K. Tanida F. Tenchini K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno Y. Usov R. Van Tonder G. Varner A. Vinokurova V. Vorobyev C. H. Wang M.-Z. Wang M. Watanabe E. Won S. B. Yang H. Ye J. H. Yin Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov Beihang University Beijing 100191 Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics Fudan University Shanghai 200443 Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Department of Physics University of Tokyo Tokyo 113-0033 Brookhaven National Laboratory Upton New York 11973 University of South Carolina Columbia South Carolina 29208 Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Deutsches Elektronen–Synchrotron 22607 Hamburg King Abdulaziz City for Science and Technology Riyadh 11442 School of Physics University of Sydney New South Wales 2006 Indian Institute of Technology Madras Chennai 600036 Indian Institute of Technology Guwahati Assam 781039 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana Wayne State University Detroit Michigan 48202 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 University of Maribor 2000 Maribor University of Hawaii Honolulu Hawaii 96822 National Institute for Nuclear Physics-Sezione di Napoli 80126 Napoli Università di Napoli Federico II 80055 Napoli Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe Department of Physics National Taiwan University Taipei 10617 National Central University Chung-li 32054 Department of Physics and Institute of Natural Sciences Hanyang University Seoul 04763 P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Korea Institute of Science and Technology Information Daejeon 34141 Gyeongsang National University Jinju 52828 Sungkyunkwan University Suwon 16419 Laboratory of the Linear Accelerator Univ. Paris-Sud CNRS/IN2P3 Université

Using a data sample of 921.9 fb−1 collected with the Belle detector, we study the process of e+e−→Ds+Ds1(2536)−+c.c. via initial-state radiation. We report the first observation of a vector charmoniumlike state decaying to Ds+Ds1(2536)−+c.c. with a significance of 5.9σ, including systematic uncertainties. The measured mass and width are (4625.9−6.0+6.2(stat)±0.4(syst)) MeV/c2 and (49.8−11.5+13.9(stat)±4.0(syst)) MeV, respectively. The product of the e+e−→Ds+Ds1(2536)−+c.c. cross section and the branching fraction of Ds1(2536)−→D¯*0K− is measured from the DsD¯s1(2536) threshold to 5.59 GeV.

关键词： Hybrid mesons Quarkonia Mass Lepton colliders

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Observation of Transverse Λ/Λ¯ Hyperon Polarization in e+e− Annihilation at Belle

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Physical Review Letters 2019年第4期122卷 042001-042001页

作者： Y. Guan A. Vossen I. Adachi K. Adamczyk J. K. Ahn H. Aihara S. Al Said D. M. Asner H. Atmacan V. Aulchenko T. Aushev R. Ayad V. Babu I. Badhrees A. M. Bakich V. Bansal P. Behera C. Beleño M. Berger V. Bhardwaj B. Bhuyan T. Bilka J. Biswal A. Bobrov G. Bonvicini A. Bozek M. Bračko T. E. Browder L. Cao D. Červenkov P. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin K. Cho S.-K. Choi Y. Choi D. Cinabro S. Cunliffe N. Dash S. Di Carlo J. Dingfelder Z. Doležal T. V. Dong Z. Drásal S. Eidelman D. Epifanov J. E. Fast T. Ferber B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash M. Gelb A. Giri P. Goldenzweig B. Golob E. Guido J. Haba K. Hayasaka H. Hayashii S. Hirose W.-S. Hou T. Iijima K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs I. Jaegle H. B. Jeon S. Jia Y. Jin D. Joffe K. K. Joo T. Julius K. H. Kang T. Kawasaki C. Kiesling D. Y. Kim H. J. Kim J. B. Kim K. T. Kim S. H. Kim K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan R. Kroeger P. Krokovny T. Kuhr R. Kulasiri A. Kuzmin Y.-J. Kwon J. S. Lange I. S. Lee S. C. Lee L. K. Li Y. B. Li L. Li Gioi J. Libby D. Liventsev M. Lubej T. Luo M. Masuda T. Matsuda D. Matvienko M. Merola H. Miyata R. Mizuk G. B. Mohanty H. K. Moon T. Mori R. Mussa 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 S. Pardi H. Park S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen V. Popov E. Prencipe A. Rabusov A. Rostomyan G. Russo D. Sahoo Y. Sakai M. Salehi S. Sandilya L. Santelj T. Sanuki V. Savinov O. Schneider G. Schnell C. Schwanda R. Seidl Y. Seino K. Senyo O. Seon 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 M. Sumihama T. Sumiyoshi W. Sutcliffe K. Suzuki M. Takizawa U. Tamponi K. Tanida F. Tenchini M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov S. E. Vahsen C. Van Hulse R. Van Tonder G. Varner A. Vinokurova V. Vorobyev E. Waheed B. Wang C. H. Wang M.-Z. Wang P. Wang X. L. Wang S. Wat Indiana University Bloomington Indiana 47408 High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 Duke University Durham North Carolina 27708 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 Korea University Seoul 136-713 Department of Physics University of Tokyo Tokyo 113-0033 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Department of Physics Faculty of Science King Abdulaziz University Jeddah 21589 Brookhaven National Laboratory Upton New York 11973 University of South Carolina Columbia South Carolina 29208 Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 Moscow Institute of Physics and Technology Moscow Region 141700 Tata Institute of Fundamental Research Mumbai 400005 King Abdulaziz City for Science and Technology Riyadh 11442 School of Physics University of Sydney New South Wales 2006 Pacific Northwest National Laboratory Richland Washington 99352 Indian Institute of Technology Madras Chennai 600036 II. Physikalisches Institut Georg-August-Universität Göttingen 37073 Göttingen Stefan Meyer Institute for Subatomic Physics Vienna 1090 Indian Institute of Science Education and Research Mohali SAS Nagar 140306 Indian Institute of Technology Guwahati Assam 781039 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana Wayne State University Detroit Michigan 48202 University of Maribor 2000 Maribor University of Hawaii Honolulu Hawaii 96822 Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe Department of Physics National Taiwan University Taipei 10617 Max-Planck-Institut für Physik 80805 München National Central University Chung-li 32054 Hanyang University Seoul 133-791 P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Korea Institute of Science and Technol

We report the first observation of the spontaneous polarization of Λ and Λ¯ hyperons transverse to the production plane in e+e− annihilation, which is attributed to the effect arising from a polarizing fragmentation function. For inclusive Λ/Λ¯ production, we also report results with subtracted feed-down contributions from Σ0 and charm. This measurement uses a dataset of 800.4 fb−1 collected by the Belle experiment at or near a center-of-mass energy of 10.58 GeV. We observe a significant polarization that rises with the fractional energy carried by the Λ/Λ¯ hyperon.

关键词： Fragmentation into hadrons Quantum chromodynamics

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Search for the lepton-flavor-violating decay B0→K*0μ±e∓

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Physical Review D 2018年第7期98卷 071101(R)-071101(R)页

作者： S. Sandilya K. Trabelsi A. J. Schwartz I. Adachi H. Aihara S. Al Said D. M. Asner H. Atmacan V. Aulchenko T. Aushev R. Ayad V. Babu I. Badhrees S. Bahinipati A. M. Bakich V. Bansal P. Behera C. Beleño V. Bhardwaj B. Bhuyan T. Bilka J. Biswal A. Bobrov A. Bozek M. Bračko T. E. Browder L. Cao D. Červenkov P. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin K. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe N. Dash S. Di Carlo J. Dingfelder Z. Doležal T. V. Dong Z. Drásal S. Eidelman D. Epifanov J. E. Fast T. Ferber B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash M. Gelb A. Giri P. Goldenzweig B. Golob D. Greenwald Y. Guan J. Haba T. Hara K. Hayasaka H. Hayashii S. Hirose W.-S. Hou C.-L. Hsu T. Iijima K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs I. Jaegle H. B. Jeon S. Jia Y. Jin D. Joffe K. K. Joo T. Julius A. B. Kaliyar K. H. Kang T. Kawasaki H. Kichimi C. Kiesling D. Y. Kim J. B. Kim K. T. Kim S. H. Kim K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan R. Kroeger P. Krokovny T. Kuhr R. Kulasiri R. Kumar A. Kuzmin Y.-J. Kwon J. S. Lange I. S. Lee S. C. Lee L. K. Li Y. B. Li L. Li Gioi J. Libby D. Liventsev M. Lubej M. Masuda T. Matsuda D. Matvienko 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 K. Ogawa S. Ogawa H. Ono P. Pakhlov G. Pakhlova B. Pal S. Pardi S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen V. Popov K. Prasanth E. Prencipe M. V. Purohit A. Rabusov P. K. Resmi A. Rostomyan G. Russo D. Sahoo Y. Sakai M. Salehi L. Santelj T. Sanuki V. Savinov O. Schneider G. Schnell C. Schwanda Y. Seino K. Senyo O. Seon M. E. Sevior C. P. Shen T.-A. Shibata J.-G. Shiu B. Shwartz J. B. Singh A. Sokolov E. Solovieva M. Starič J. F. Strube M. Sumihama K. Sumisawa T. Sumiyoshi W. Sutcliffe M. Takizawa U. Tamponi K. Tanida F. Tenchini M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo Y. Ushiroda Y. Usov C. Van Hulse R. Van Tonder G. Varner A. V University of Cincinnati Cincinnati 45221 Ohio High Energy Accelerator Research Organization (KEK) 305-0801 Tsukuba SOKENDAI (The Graduate University for Advanced Studies) 240-0193 Hayama Department of Physics University of Tokyo 113-0033 Tokyo Department of Physics Faculty of Science University of Tabuk 71451 Tabuk Department of Physics Faculty of Science King Abdulaziz University 21589 Jeddah Brookhaven National Laboratory Upton 11973 New York University of South Carolina Columbia 29208 South Carolina Budker Institute of Nuclear Physics SB RAS 630090 Novosibirsk Novosibirsk State University 630090 Novosibirsk Moscow Institute of Physics and Technology 141700 Moscow Region Tata Institute of Fundamental Research 400005 Mumbai King Abdulaziz City for Science and Technology 11442 Riyadh Indian Institute of Technology Bhubaneswar 751007 Satya Nagar School of Physics University of Sydney 2006 New South Wales Pacific Northwest National Laboratory Richland 99352 Washington Indian Institute of Technology Madras 600036 Chennai II. Physikalisches Institut Georg-August-Universität Göttingen 37073 Göttingen Indian Institute of Science Education and Research Mohali 140306 SAS Nagar Indian Institute of Technology Guwahati 781039 Assam Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana H. Niewodniczanski Institute of Nuclear Physics 31-342 Krakow University of Maribor 2000 Maribor University of Hawaii Honolulu 96822 Hawaii Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe Department of Physics National Taiwan University 10617 Taipei Max-Planck-Institut für Physik 80805 München National Central University 32054 Chung-li Hanyang University 133-791 Seoul P.N. Lebedev Physical Institute of the Russian Academy of Sciences 119991 Moscow Korea Institute of Science and Technology Information 305-806 Daejeon Gyeongsang National University 660-701 Chinju Sungkyunkwan University 440-746 Suwon I

We have searched for the lepton-flavor-violating decay B0→K*0μ±e∓ using a data sample of 711 fb−1 that contains 772×106 BB¯ pairs. The data were collected near the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. No signals were observed, and we set 90% confidence level upper limits on the branching fractions of B(B0→K*0μ+e−)<1.2×10−7, B(B0→K*0μ−e+)<1.6×10−7, and, for both decays combined, B(B0→K*0μ±e∓)<1.8×10−7. These are the most stringent limits on these decays to date.

关键词： Flavor changing neutral currents Rare decays Flavor symmetries

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Observation of B+→pΛ¯K+K− and B+→p¯ΛK+K+

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Physical Review D 2019年第3期99卷 032003-032003页

作者： P.-C. Lu M.-Z. Wang R. Chistov P. Chang I. Adachi J. K. Ahn H. Aihara S. Al Said D. M. Asner H. Atmacan V. Aulchenko T. Aushev R. Ayad V. Babu I. Badhrees A. M. Bakich V. Bansal P. Behera C. Beleño M. Berger V. Bhardwaj B. Bhuyan T. Bilka J. Biswal G. Bonvicini A. Bozek M. Bračko T. E. Browder L. Cao D. Červenkov M.-C. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin K. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe N. Dash S. Di Carlo Z. Doležal T. V. Dong Z. Drásal S. Eidelman D. Epifanov J. E. Fast T. Ferber B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash M. Gelb A. Giri P. Goldenzweig E. Guido J. Haba K. Hayasaka H. Hayashii S. Hirose W.-S. Hou C.-L. Hsu T. Iijima K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs H. B. Jeon S. Jia Y. Jin D. Joffe K. K. Joo T. Julius A. B. Kaliyar T. Kawasaki H. Kichimi C. Kiesling D. Y. Kim H. J. Kim J. B. Kim K. T. Kim S. H. Kim K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan R. Kroeger P. Krokovny T. Kuhr R. Kulasiri A. Kuzmin Y.-J. Kwon Y.-T. Lai J. S. Lange I. S. Lee S. C. Lee L. K. Li Y. B. Li L. Li Gioi J. Libby D. Liventsev M. Lubej T. Luo M. Masuda T. Matsuda D. Matvienko M. Merola K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty H. K. Moon T. Mori R. Mussa M. Nakao T. Nanut K. J. Nath Z. Natkaniec M. Nayak N. K. Nisar S. Nishida S. Ogawa S. Okuno H. Ono H. Ozaki P. Pakhlov G. Pakhlova B. Pal S. Pardi H. Park S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen V. Popov E. Prencipe A. Rabusov M. Ritter A. Rostomyan G. Russo Y. Sakai M. Salehi S. Sandilya L. Santelj T. Sanuki 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 B. Shwartz F. Simon J. B. Singh A. Sokolov E. Solovieva M. Starič J. F. Strube M. Sumihama T. Sumiyoshi W. Sutcliffe M. Takizawa U. Tamponi K. Tanida F. Tenchini M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov S. E. Vahsen C. Van Hulse R. Van Tonder G. Varner A. Vinokurova V. Vorobyev A. Vossen B. Wang C. H. Wang X. L. Wan Department of Physics National Taiwan University Taipei 10617 P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Moscow Physical Engineering Institute Moscow 115409 High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Korea University Seoul 136-713 Department of Physics University of Tokyo Tokyo 113-0033 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Department of Physics Faculty of Science King Abdulaziz University Jeddah 21589 Brookhaven National Laboratory Upton New York 11973 University of South Carolina Columbia South Carolina 29208 Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 Moscow Institute of Physics and Technology Moscow Region 141700 Tata Institute of Fundamental Research Mumbai 400005 King Abdulaziz City for Science and Technology Riyadh 11442 School of Physics University of Sydney New South Wales 2006 Pacific Northwest National Laboratory Richland Washington 99352 Indian Institute of Technology Madras Chennai 600036 II. Physikalisches Institut Georg-August-Universität Göttingen 37073 Göttingen Stefan Meyer Institute for Subatomic Physics Vienna 1090 Indian Institute of Science Education and Research Mohali SAS Nagar 140306 Indian Institute of Technology Guwahati Assam 781039 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana Wayne State University Detroit Michigan 48202 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 University of Maribor 2000 Maribor University of Hawaii Honolulu Hawaii 96822 Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe Department of Physics Fu Jen Catholic University Taipei 24205 Max-Planck-Institut für Physik 80805 München National Central University Chung-li 32054 Hanyang University Seoul 133-791 Korea Institut

We report the study of B+→pΛ¯K+K− and B+→p¯ΛK+K+ decays using a 772×106 BB¯ pair data sample recorded on the ϒ(4S) resonance with the Belle detector at KEKB. The following branching fractions are measured: B(B+→pΛ¯K+K−)=(4.10−0.43+0.45±0.50)×10−6, B(B+→p¯ΛK+K+)=(3.70−0.37+0.39±0.44)×10−6, B(ηc→pΛ¯K−+c.c.)=(2.83−0.34+0.36±0.35)×10−3 and B(B+→pΛ¯ϕ)=( 7.95±2.09±0.77)×10−7, where c.c. denotes the corresponding charge-conjugation process. The intermediate resonance decays are excluded in the four-body decay measurements. We also find evidence for B(ηc→Λ(1520)Λ¯+c.c.)=(3.48±1.48±0.46)×10−3 and B(B+→Λ(1520)Λ¯K+)=( 2.23±0.63±0.25)×10−6. No significant signals are found for J/ψ→Λ(1520)Λ¯+c.c. and B+→Λ¯(1520)ΛK+; we set the 90% confidence level upper limits on their decay branching fractions as <1.80×10−3 and <2.08×10−6, respectively.

关键词： Branching fraction Electroweak interaction Hadronic decays Rare decays Bottom mesons Hyperons

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Search for B0→X(3872)γ

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Physical Review D 2019年第1期100卷 012002-012002页

作者： P.-C. Chou P. Chang I. Adachi H. Aihara S. Al Said D. M. Asner H. Atmacan V. Aulchenko T. Aushev R. Ayad V. Babu I. Badhrees A. M. Bakich P. Behera J. Bennett M. Berger B. Bhuyan T. Bilka J. Biswal A. Bobrov A. Bozek M. Bračko T. E. Browder M. Campajola L. Cao D. Červenkov V. Chekelian A. Chen B. G. Cheon K. Chilikin H. E. Cho K. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe N. Dash S. Di Carlo Z. Doležal T. V. Dong S. Eidelman D. Epifanov J. E. Fast T. Ferber B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig O. Grzymkowska J. Haba O. Hartbrich K. Hayasaka H. Hayashii W.-S. Hou C.-L. Hsu T. Iijima K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs S. Jia Y. Jin D. Joffe K. K. Joo A. B. Kaliyar Y. Kato T. Kawasaki H. Kichimi C. Kiesling D. Y. Kim S. H. Kim K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan R. Kroeger P. Krokovny R. Kulasiri R. Kumar T. Kumita A. Kuzmin Y.-J. Kwon Y.-T. Lai J. S. Lange J. K. Lee J. Y. Lee S. C. Lee C. H. Li Y. B. Li L. Li Gioi J. Libby K. Lieret D. Liventsev T. Luo J. MacNaughton M. Masuda T. Matsuda M. Merola K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty T. Mori R. Mussa K. J. Nath M. Nayak M. Niiyama S. Nishida K. Nishimura K. Ogawa S. Ogawa H. Ono Y. Onuki P. Pakhlov G. Pakhlova B. Pal S. Pardi H. Park S. Patra S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen V. Popov E. Prencipe M. Ritter A. Rostomyan G. Russo Y. Sakai M. Salehi S. Sandilya L. Santelj T. Sanuki V. Savinov O. Schneider G. Schnell J. Schueler C. Schwanda Y. Seino K. Senyo O. Seon M. E. Sevior V. Shebalin J.-G. Shiu B. Shwartz J. B. Singh E. Solovieva M. Starič Z. S. Stottler J. F. Strube M. Sumihama T. Sumiyoshi W. Sutcliffe M. Takizawa K. Tanida Y. Tao F. Tenchini M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo Y. Ushiroda S. E. Vahsen R. Van Tonder G. Varner A. Vossen E. Waheed B. Wang C. H. Wang M.-Z. Wang P. Wang M. Watanabe S. Watanuki E. Won S. B. Yang H. Ye J. Yelton J. H. Yin C. Z. Yuan Y. Yusa Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov Department of Physics National Taiwan University Taipei 10617 High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Department of Physics University of Tokyo Tokyo 113-0033 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Department of Physics Faculty of Science King Abdulaziz University Jeddah 21589 Brookhaven National Laboratory Upton New York 11973 University of South Carolina Columbia South Carolina 29208 Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 Moscow Institute of Physics and Technology Moscow Region 141700 Deutsches Elektronen-Synchrotron 22607 Hamburg King Abdulaziz City for Science and Technology Riyadh 11442 School of Physics University of Sydney New South Wales 2006 Indian Institute of Technology Madras Chennai 600036 University of Mississippi University Mississippi 38677 Stefan Meyer Institute for Subatomic Physics Vienna 1090 Indian Institute of Technology Guwahati Assam 781039 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 University of Maribor 2000 Maribor University of Hawaii Honolulu Hawaii 96822 INFN-Sezione di Napoli 80126 Napoli Università di Napoli Federico II 80055 Napoli Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe Max-Planck-Institut für Physik 80805 München National Central University Chung-li 32054 Hanyang University Seoul 133-791 P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Korea Institute of Science and Technology Information Daejeon 305-806 Gyeongsang National University Chinju 660-701 Sungkyunkwan University Suwon 440-746 Indian Institute of Technology Hyderabad Telangana 502285 Wayne State University Detroit Michigan 48202 Indian Institute of Technology Bhuba

We report the results of a search for the decay B0→X(3872)(→J/ψπ+π−)γ. The analysis is performed on a data sample corresponding to an integrated luminosity of 711 fb−1 and containing 772×106BB¯ pairs, collected with the Belle detector at the KEKB asymmetric-energy e+e− collider running at the ϒ(4S) resonance energy. We find no evidence for a signal and place an upper limit of B(B0→X(3872)γ)×B(X(3872)→J/ψπ+π−)<5.1×10−7 at 90% confidence level.

关键词： Branching fraction Particle decays Rare decays Exotic mesons

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Measurements of isospin asymmetry and difference of direct CP asymmetries in inclusive B→Xsγ decays

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Physical Review D 2019年第3期99卷 032012-032012页

作者： S. Watanuki A. Ishikawa I. Adachi H. Aihara S. Al Said D. M. Asner T. Aushev R. Ayad V. Babu I. Badhrees A. M. Bakich V. Bansal P. Behera C. Beleño M. Berger V. Bhardwaj B. Bhuyan T. Bilka J. Biswal A. Bobrov G. Bonvicini A. Bozek M. Bračko T. E. Browder L. Cao D. Červenkov P. Chang B. G. Cheon K. Chilikin K. Cho Y. Choi S. Choudhury D. Cinabro S. Cunliffe S. Di Carlo J. Dingfelder T. V. Dong S. Eidelman D. Epifanov J. E. Fast T. Ferber A. Frey B. G. Fulsom V. Gaur N. Gabyshev A. Garmash M. Gelb A. Giri P. Goldenzweig Y. Guan E. Guido J. Haba K. Hayasaka H. Hayashii W.-S. Hou T. Iijima K. Inami G. Inguglia R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs I. Jaegle H. B. Jeon S. Jia Y. Jin K. K. Joo T. Julius G. Karyan T. Kawasaki C. Kiesling D. Y. Kim J. B. Kim S. H. Kim K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan R. Kroeger P. Krokovny T. Kuhr R. Kumar A. Kuzmin Y.-J. Kwon I. S. Lee S. C. Lee L. K. Li Y. B. 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 T. Mori M. Nakao T. Nanut K. J. Nath M. Niiyama S. Nishida K. Nishimura K. Ogawa S. Ogawa S. Okuno H. Ono W. Ostrowicz P. Pakhlov G. Pakhlova B. Pal H. Park S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen E. Prencipe M. Ritter A. Rostomyan G. Russo Y. Sakai S. Sandilya L. Santelj V. Savinov O. Schneider G. Schnell J. Schueler C. Schwanda A. J. Schwartz Y. Seino K. Senyo O. Seon V. Shebalin T.-A. Shibata J.-G. Shiu B. Shwartz A. Sokolov E. Solovieva S. Stanič M. Starič T. Sumiyoshi W. Sutcliffe M. Takizawa K. Tanida N. Taniguchi F. Tenchini M. Uchida T. Uglov Y. Unno S. Uno S. E. Vahsen C. Van Hulse R. Van Tonder G. Varner K. E. Varvell A. Vossen B. Wang C. H. Wang M.-Z. Wang P. Wang M. Watanabe E. Widmann E. Won H. Ye J. H. Yin Y. Yusa S. Zakharov Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov A. Zupanc Department of Physics Tohoku University Sendai 980-8578 High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Department of Physics University of Tokyo Tokyo 113-0033 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Department of Physics Faculty of Science King Abdulaziz University Jeddah 21589 Brookhaven National Laboratory Upton New York 11973 Moscow Institute of Physics and Technology Moscow Region 141700 Tata Institute of Fundamental Research Mumbai 400005 King Abdulaziz City for Science and Technology Riyadh 11442 School of Physics University of SydneySydney New South Wales 2006 Pacific Northwest National Laboratory Richland Washington 99352 Indian Institute of Technology Madras Chennai 600036 II. Physikalisches Institut Georg-August-Universität Göttingen 37073 Göttingen Stefan Meyer Institute for Subatomic Physics Vienna 1090 Indian Institute of Science Education and Research Mohali SAS Nagar 140306 Mohali Indian Institute of Technology Guwahati Assam 781039 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 Wayne State University Detroit Michigan 48202 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 University of Maribor 2000 Maribor University of Hawaii Honolulu Hawaii 96822 Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe Department of Physics National Taiwan University Taipei 10617 Hanyang University Seoul 133-791 P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Korea Institute of Science and Technology Information Daejeon 305-806 Sungkyunkwan University Suwon 440-746 Indian Institute of Technology Hyderabad Telangana 502285 Deutsches Elektronen–Synchrotron 22607 Hamburg LAL Univ. Paris-Sud C

We report measurements of isospin asymmetry Δ0− and difference of direct CP asymmetries ΔACP between charged and neutral B→Xsγ decays. This analysis is based on the data sample containing 772×106BB¯ pairs that was collected with the Belle detector at the KEKB energy-asymmetric e+e− collider. Using a sum-of-exclusive technique with invariant Xs mass up to 2.8 GeV/c2, we obtain Δ0−=[−0.48±1.49(stat)±0.97(syst)±1.15(f+−/f00)]% and ΔACP=[+3.69±2.65(stat)±0.76(syst)]%, where the last uncertainty for Δ0− is due to the uncertainty on the production ratio of B+B− to B0B¯0 in ϒ(4S) decays. The measured value of Δ0− is consistent with zero, allowing us to constrain the resolved photon contribution in the B→Xsγ, and improve the branching fraction prediction. The result for ΔACP is consistent with the prediction of the SM. We also measure the direct CP asymmetries for charged and neutral B→Xsγ decays. All the measurements are the most precise to date.

关键词： Flavor changing neutral currents Leptonic, semileptonic & radiative decays Particle decays Particle interactions Rare decays Bottom quark Photons Strange quark CP symmetry CP violation

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Observation of τ−→π−ντe+e− and search for τ−→π−ντμ+μ−

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Physical Review D 2019年第7期100卷 071101(R)-071101(R)页

作者： Y. Jin H. Aihara D. Epifanov I. Adachi S. Al Said D. M. Asner V. Aulchenko T. Aushev R. Ayad V. Babu I. Badhrees S. Bahinipati V. Bansal P. Behera M. Berger V. Bhardwaj T. Bilka J. Biswal A. Bobrov G. Bonvicini A. Bozek M. Bračko M. Campajola L. Cao D. Červenkov V. Chekelian A. Chen B. G. Cheon K. Chilikin H. E. Cho K. Cho Y. Choi S. Choudhury D. Cinabro S. Cunliffe S. Di Carlo Z. Doležal T. V. Dong D. Dossett S. Eidelman J. E. Fast T. Ferber B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig B. Golob D. Greenwald O. Grzymkowska J. Haba K. Hayasaka H. Hayashii M. T. Hedges W.-S. Hou K. Huang T. Iijima K. Inami G. Inguglia A. Ishikawa M. Iwasaki Y. Iwasaki W. W. Jacobs H. B. Jeon S. Jia D. Joffe K. K. Joo J. Kahn A. B. Kaliyar G. Karyan T. Kawasaki H. Kichimi C. Kiesling D. Y. Kim H. J. Kim K. T. Kim S. H. Kim K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan R. Kroeger P. Krokovny R. Kulasiri R. Kumar A. Kuzmin Y.-J. Kwon K. Lalwani J. S. Lange J. Y. Lee S. C. Lee C. H. Li L. K. Li Y. B. Li L. Li Gioi J. Libby K. Lieret Z. Liptak D. Liventsev P.-C. Lu T. Luo J. MacNaughton M. Masuda T. Matsuda D. Matvienko M. Merola K. Miyabayashi H. Miyata R. Mizuk T. Mori R. Mussa E. Nakano M. Nakao K. J. Nath Z. Natkaniec M. Nayak M. Niiyama N. K. Nisar S. Nishida S. Ogawa H. Ono Y. Onuki P. Pakhlov G. Pakhlova B. Pal S. Pardi H. Park S.-H. Park S. Patra S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen V. Popov E. Prencipe M. V. Purohit A. Rostomyan G. Russo D. Sahoo Y. Sakai M. Salehi S. Sandilya L. Santelj T. Sanuki V. Savinov O. Schneider G. Schnell J. Schueler C. Schwanda Y. Seino K. Senyo O. Seon M. E. Sevior V. Shebalin C. P. Shen J.-G. Shiu B. Shwartz F. Simon J. B. Singh A. Sokolov E. Solovieva S. Stanič M. Starič Z. S. Stottler J. F. Strube T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida F. Tenchini K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov R. Van Tonder G. Varner A. Vinokurova V. Vorobyev A. Vossen B. Wang C. H. Wang M.-Z. Wang P. Wang S. Watanuki E. Won S. B. Yang H Department of Physics University of Tokyo Tokyo 113-0033 Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Department of Physics Faculty of Science King Abdulaziz University Jeddah 21589 Brookhaven National Laboratory Upton New York 11973 Moscow Institute of Physics and Technology Moscow Region 141700 Deutsches Elektronen–Synchrotron 22607 Hamburg King Abdulaziz City for Science and Technology Riyadh 11442 Indian Institute of Technology Bhubaneswar Satya Nagar 751007 Pacific Northwest National Laboratory Richland Washington 99352 Indian Institute of Technology Madras Chennai 600036 Stefan Meyer Institute for Subatomic Physics Vienna 1090 Indian Institute of Science Education and Research Mohali SAS Nagar 140306 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana Wayne State University Detroit Michigan 48202 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 University of Maribor 2000 Maribor INFN—Sezione di Napoli 80126 Napoli Università di Napoli Federico II 80055 Napoli Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe Max-Planck-Institut für Physik 80805 München National Central University Chung-li 32054 Hanyang University Seoul 133-791 P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Korea Institute of Science and Technology Information Daejeon 305-806 Sungkyunkwan University Suwon 440-746 Indian Institute of Technology Hyderabad Telangana 502285 LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay School of Physics University of Melbourne Victoria 3010 Panjab University Chandigarh 160014 Virginia Polytechnic Institute and State University Blacksbu

We present the first measurements of branching fractions of rare tau-lepton decays, τ−→π−ντℓ+ℓ− (ℓ=e or μ), using a data sample corresponding to 562 fb−1 collected at a center-of-mass energy of 10.58 GeV with the Belle detector at the KEKB asymmetric-energy e+e− collider. The τ−→π−ντe+e− decay is observed for the first time with 7.0σ significance. The partial branching fraction determined by the structure-dependent mechanisms mediated by either a vector or an axial-vector current for the mass region Mπee>1.05 GeV/c2 is measured to be B(τ−→π−ντe+e−)[Mπ−e+e−>1.05 GeV/c2]=(5.90±0.53±0.85±0.11)×10−6, where the first uncertainty is statistical, the second is systematic, and the third is due to model dependence. In the full phase space, due to the different detection efficiencies for the structure-dependent mechanisms mediated by axial-vector and vector currents, the branching fraction varies from BA(τ−→π−ντe+e−)=(1.46±0.13±0.21)×10−5 to BV(τ−→π−ντe+e−)=(3.01±0.27±0.43)×10−5, respectively. An upper limit is set on the branching fraction of the τ−→π−ντμ+μ− decay, B(τ−→π−ντμ+μ−)<1.14×10−5, at the 90% confidence level.

关键词： Branching fraction Particle decays Rare decays

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