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Precise Measurement of the D0 and D+ Lifetimes at Belle II

Physical Review Letters 2021年第21期127卷 211801-211801页

作者： F. Abudinén I. Adachi K. Adamczyk L. Aggarwal H. Ahmed H. Aihara N. Akopov A. Aloisio N. Anh Ky D. M. Asner H. Atmacan V. Aushev V. Babu S. Bacher H. Bae S. Baehr S. Bahinipati P. Bambade Sw. Banerjee S. Bansal M. Barrett J. Baudot M. Bauer A. Baur J. Becker P. K. Behera J. V. Bennett E. Bernieri F. U. Bernlochner M. Bertemes E. Bertholet M. Bessner S. Bettarini V. Bhardwaj F. Bianchi T. Bilka S. Bilokin D. Biswas A. Bobrov D. Bodrov A. Bolz A. Bozek M. Bračko P. Branchini N. Braun R. A. Briere T. E. Browder A. Budano S. Bussino M. Campajola L. Cao G. Casarosa C. Cecchi D. Červenkov M.-C. Chang P. Chang R. Cheaib V. Chekelian C. Chen Y.-T. Chen B. G. Cheon K. Chilikin K. Chirapatpimol H.-E. Cho K. Cho S.-J. Cho S.-K. Choi S. Choudhury D. Cinabro L. Corona L. M. Cremaldi S. Cunliffe T. Czank F. Dattola E. De La Cruz-Burelo G. de Marino G. De Nardo G. De Pietro R. de Sangro M. Destefanis S. Dey A. De Yta-Hernandez A. Di Canto F. Di Capua J. Dingfelder Z. Doležal I. Domínguez Jiménez T. V. Dong M. Dorigo K. Dort D. Dossett S. Dubey S. Duell G. Dujany P. Ecker D. Epifanov T. Ferber D. Ferlewicz G. Finocchiaro K. Flood A. Fodor F. Forti B. G. Fulsom A. Gabrielli N. Gabyshev A. Gaz A. Gellrich G. Giakoustidis R. Giordano A. Giri A. Glazov B. Gobbo R. Godang P. Goldenzweig B. Golob W. Gradl E. Graziani D. Greenwald T. Gu Y. Guan K. Gudkova J. Guilliams C. Hadjivasiliou S. Halder K. Hara T. Hara O. Hartbrich K. Hayasaka H. Hayashii S. Hazra C. Hearty I. Heredia de la Cruz M. Hernández Villanueva A. Hershenhorn T. Higuchi E. C. Hill H. Hirata M. Hoek M. Hohmann C.-L. Hsu T. Humair T. Iijima K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs D. E. Jaffe E.-J. Jang S. Jia Y. Jin H. Junkerkalefeld H. Kakuno A. B. Kaliyar J. Kandra K. H. Kang R. Karl G. Karyan Y. Kato T. Kawasaki C. Kiesling C.-H. Kim D. Y. Kim Y.-K. Kim Y. Kim T. D. Kimmel K. Kinoshita P. Kodyš T. Koga S. Kohani T. Konno S. Korpar E. Kovalenko R. Kowalewski T. M. G. Kraetzschmar F. Krinner P. Križan P. Krokovny T. Kuhr J. Kumar M. Ku INFN Sezione di Trieste I-34127 Trieste Italy High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 Japan The Graduate University for Advanced Studies (SOKENDAI) Hayama 240-0193 Japan H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 Poland Panjab University Chandigarh 160014 India St. Francis Xavier University Antigonish Nova Scotia B2G 2W5 Canada Department of Physics University of Tokyo Tokyo 113-0033 Japan Alikhanyan National Science Laboratory Yerevan 0036 Armenia Dipartimento di Scienze Fisiche Università di Napoli Federico II I-80126 Napoli Italy INFN Sezione di Napoli I-80126 Napoli Italy Institute of Physics Vietnam Academy of Science and Technology (VAST) Hanoi Vietnam Institute of Theoretical and Applied Research (ITAR) Duy Tan University Hanoi 100000 Vietnam Brookhaven National Laboratory Upton New York 11973 USA University of Cincinnati Cincinnati Ohio 45221 USA Taras Shevchenko National Univ. of Kiev Kiev Ukraine Deutsches Elektronen-Synchrotron 22607 Hamburg Germany Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe Germany Indian Institute of Technology Bhubaneswar Satya Nagar 751007 India Université Paris-Saclay CNRS/IN2P3 IJCLab 91405 Orsay France University of Louisville Louisville Kentucky 40292 USA Université de Strasbourg CNRS IPHC UMR 7178 67037 Strasbourg France Indian Institute of Technology Madras Chennai 600036 India University of Mississippi University Mississippi 38677 USA INFN Sezione di Roma Tre I-00146 Roma Italy University of Bonn 53115 Bonn Germany Institute of High Energy Physics Vienna 1050 Austria Tel Aviv University School of Physics and Astronomy Tel Aviv 69978 Israel University of Hawaii Honolulu Hawaii 96822 USA Dipartimento di Fisica Università di Pisa I-56127 Pisa Italy INFN Sezione di Pisa I-56127 Pisa Italy Indian Institute of Science Education and Research Mohali SAS Nagar 140306 India Dipartimento di Fisica Univers

We report a measurement of the D0 and D+ lifetimes using D0→K−π+ and D+→K−π+π+ decays reconstructed in e+e−→cc¯ data recorded by the Belle II experiment at the SuperKEKB asymmetric-energy e+e− collider. The data, collected at center-of-mass energies at or near the ϒ(4S) resonance, correspond to an integrated luminosity of 72 fb−1. The results, τ(D0)=410.5±1.1(stat)±0.8(syst) fs and τ(D+)=1030.4±4.7(stat)±3.1(syst) fs, are the most precise to date and are consistent with previous determinations.

关键词： Hadronic decays Lifetimes & widths Charmed mesons

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Search for Axionlike Particles Produced in e+e− Collisions at Belle II

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Physical Review Letters 2020年第16期125卷 161806-161806页

作者： F. Abudinén I. Adachi H. Aihara N. Akopov A. Aloisio F. Ameli N. Anh Ky D. M. Asner T. Aushev V. Aushev V. Babu S. Baehr S. Bahinipati P. Bambade Sw. Banerjee S. Bansal J. Baudot J. Becker P. K. Behera J. V. Bennett E. Bernieri F. U. Bernlochner M. Bertemes M. Bessner S. Bettarini V. Bhardwaj F. Bianchi T. Bilka S. Bilokin D. Biswas M. Bračko P. Branchini N. Braun T. E. Browder A. Budano S. Bussino M. Campajola G. Casarosa C. Cecchi D. Červenkov M.-C. Chang P. Chang R. Cheaib V. Chekelian B. G. Cheon K. Chilikin K. Chirapatpimol H.-E. Cho K. Cho S.-J. Cho S.-K. Choi D. Cinabro L. Corona L. M. Cremaldi S. Cunliffe N. Dash F. Dattola E. De La Cruz-Burelo G. De Nardo M. De Nuccio G. De Pietro R. de Sangro M. Destefanis A. De Yta-Hernandez F. Di Capua Z. Doležal T. V. Dong K. Dort D. Dossett G. Dujany S. Eidelman T. Ferber D. Ferlewicz S. Fiore A. Fodor F. Forti B. G. Fulsom E. Ganiev R. Garg A. Garmash V. Gaur A. Gaz U. Gebauer A. Gellrich T. Geßler R. Giordano A. Giri B. Gobbo R. Godang P. Goldenzweig B. Golob P. Gomis W. Gradl E. Graziani D. Greenwald C. Hadjivasiliou S. Halder O. Hartbrich K. Hayasaka H. Hayashii C. Hearty M. T. Hedges I. Heredia de la Cruz M. Hernández Villanueva A. Hershenhorn T. Higuchi E. C. Hill H. Hirata M. Hoek M. Hohmann C.-L. Hsu Y. Hu K. Inami G. Inguglia J. Irakkathil Jabbar A. Ishikawa R. Itoh P. Jackson W. W. Jacobs D. E. Jaffe E.-J. Jang S. Jia Y. Jin C. Joo A. B. Kaliyar J. Kandra G. Karyan Y. Kato H. Kichimi C. Kiesling C.-H. Kim D. Y. Kim H. J. Kim S.-H. Kim Y.-K. Kim T. D. Kimmel K. Kinoshita C. Kleinwort P. Kodyš T. Koga S. Kohani I. Komarov S. Korpar T. M. G. Kraetzschmar P. Križan P. Krokovny T. Kuhr M. Kumar R. Kumar K. Kumara S. Kurz Y.-J. Kwon S. Lacaprara C. La Licata L. Lanceri J. S. Lange I.-S. Lee S. C. Lee P. Leitl D. Levit P. M. Lewis C. Li L. K. Li Y. B. Li J. Libby K. Lieret L. Li Gioi Z. Liptak Q. Y. Liu D. Liventsev S. Longo T. Luo C. MacQueen Y. Maeda R. Manfredi E. Manoni S. Marcello C. Marinas A. Martini M. Masuda K. Matsuoka D. Matvienko F. Meggendorfer F. Me INFN Sezione di Trieste I-34127 Trieste High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 The Graduate University for Advanced Studies (SOKENDAI) Hayama 240-0193 Department of Physics University of Tokyo Tokyo 113-0033 Alikhanyan National Science Laboratory Yerevan 0036 Dipartimento di Scienze Fisiche Università di Napoli Federico II I-80126 Napoli INFN Sezione di Napoli I-80126 Napoli INFN Sezione di Roma I-00185 Roma Institute of Physics Vietnam Academy of Science and Technology (VAST) Hanoi Institute of Theoretical and Applied Research (ITAR) Duy Tan University Hanoi 100000 Brookhaven National Laboratory Upton New York 11973 Higher School of Economics (HSE) Moscow 101000 Taras Shevchenko National University of Kiev Kiev Deutsches Elektronen–Synchrotron 22607 Hamburg Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe Indian Institute of Technology Bhubaneswar Satya Nagar 751007 Université Paris-Saclay CNRS/IN2P3 IJCLab 91405 Orsay University of Louisville Louisville Kentucky 40292 Panjab University Chandigarh 160014 Université de Strasbourg CNRS IPHC UMR 7178 67037 Strasbourg Indian Institute of Technology Madras Chennai 600036 University of Mississippi University Mississippi 38677 INFN Sezione di Roma Tre I-00146 Roma University of Bonn 53115 Bonn Institute of High Energy Physics Vienna 1050 University of Hawaii Honolulu Hawaii 96822 Dipartimento di Fisica Università di Pisa I-56127 Pisa INFN Sezione di Pisa I-56127 Pisa Indian Institute of Science Education and Research Mohali SAS Nagar 140306 Dipartimento di Fisica Università di Torino I-10125 Torino INFN Sezione di Torino I-10125 Torino Faculty of Mathematics and Physics Charles University 121 16 Prague Ludwig Maximilians University 80539 Munich University of Maribor 2000 Maribor J. Stefan Institute 1000 Ljubljana Dipartimento di Matematica e Fisica Università di Roma Tre I-00146 Roma Dipartimento di Fisica Università di Perugia I-06123 Pe

We present a search for the direct production of a light pseudoscalar a decaying into two photons with the Belle II detector at the SuperKEKB collider. We search for the process e+e−→γa, a→γγ in the mass range 0.2data corresponding to an integrated luminosity of (445±3) pb−1. Light pseudoscalars interacting predominantly with standard model gauge bosons (so-called axionlike particles or ALPs) are frequently postulated in extensions of the standard model. We find no evidence for ALPs and set 95% confidence level upper limits on the coupling strength gaγγ of ALPs to photons at the level of 10−3 GeV−1. The limits are the most restrictive to date for 0.2

关键词： Extensions of gauge sector Axions Hypothetical gauge bosons Lepton colliders

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Search for an Invisibly Decaying Z′ Boson at Belle II in e+e−→μ+μ−(e±μ∓) Plus Missing Energy Final States

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Physical Review Letters 2020年第14期124卷 141801-141801页

作者： I. Adachi P. Ahlburg H. Aihara N. Akopov A. Aloisio N. Anh Ky D. M. Asner H. Atmacan T. Aushev V. Aushev T. Aziz V. Babu S. Baehr P. Bambade Sw. Banerjee V. Bansal M. Barrett J. Baudot J. Becker P. K. Behera J. V. Bennett E. Bernieri F. U. Bernlochner M. Bertemes M. Bessner S. Bettarini F. Bianchi D. Biswas A. Bozek M. Bračko P. Branchini R. A. Briere T. E. Browder A. Budano L. Burmistrov S. Bussino M. Campajola L. Cao G. Casarosa C. Cecchi D. Červenkov M.-C. Chang R. Cheaib V. Chekelian Y. Q. Chen Y.-T. Chen B. G. Cheon K. Chilikin K. Cho S. Cho S.-K. Choi S. Choudhury D. Cinabro L. Corona L. M. Cremaldi S. Cunliffe T. Czank F. Dattola E. De La Cruz-Burelo G. De Nardo M. De Nuccio G. De Pietro R. de Sangro M. Destefanis S. Dey A. De Yta-Hernandez F. Di Capua Z. Doležal I. Domínguez Jiménez T. V. Dong K. Dort D. Dossett S. Dubey S. Duell G. Dujany S. Eidelman M. Eliachevitch J. E. Fast T. Ferber D. Ferlewicz G. Finocchiaro S. Fiore A. Fodor F. Forti B. G. Fulsom E. Ganiev M. Garcia-Hernandez R. Garg V. Gaur A. Gaz A. Gellrich J. Gemmler T. Geßler R. Giordano A. Giri B. Gobbo R. Godang P. Goldenzweig B. Golob P. Gomis W. Gradl E. Graziani D. Greenwald Y. Guan C. Hadjivasiliou S. Halder T. Hara O. Hartbrich K. Hayasaka H. Hayashii C. Hearty M. T. Hedges I. Heredia de la Cruz M. Hernández Villanueva A. Hershenhorn T. Higuchi E. C. Hill M. Hoek C.-L. Hsu Y. Hu T. Iijima K. Inami G. Inguglia J. Irakkathil Jabbar A. Ishikawa R. Itoh Y. Iwasaki W. W. Jacobs D. E. Jaffe E.-J. Jang H. B. Jeon S. Jia Y. Jin C. Joo K. K. Joo J. Kahn H. Kakuno A. B. Kaliyar J. Kandra G. Karyan Y. Kato T. Kawasaki B. H. Kim C.-H. Kim D. Y. Kim K.-H. Kim S.-H. Kim Y. K. Kim Y. Kim T. D. Kimmel H. Kindo C. Kleinwort P. Kodyš T. Koga S. Kohani I. Komarov S. Korpar N. Kovalchuk T. M. G. Kraetzschmar P. Križan R. Kroeger P. Krokovny T. Kuhr J. Kumar M. Kumar R. Kumar K. Kumara S. Kurz A. Kuzmin Y.-J. Kwon S. Lacaprara C. La Licata L. Lanceri J. S. Lange K. Lautenbach I.-S. Lee S. C. Lee P. Leitl D. Levit L. K. Li Y. B. Li J. Libby K. Lieret L. Li High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 The Graduate University for Advanced Studies (SOKENDAI) Hayama 240-0193 University of Bonn 53115 Bonn Department of Physics University of Tokyo Tokyo 113-0033 Alikhanyan National Science Laboratory Yerevan 0036 Dipartimento di Scienze Fisiche Università di Napoli Federico II I-80126 Napoli INFN Sezione di Napoli I-80126 Napoli Institute of Physics Hanoi Institute of Theoretical and Applied Research (ITAR) Duy Tan University Hanoi 100000 Vietnam Brookhaven National Laboratory Upton New York 11973 University of Cincinnati Cincinnati Ohio 45221 Moscow Institute of Physics and Technology Moscow Region 141700 Taras Shevchenko National Univ. of Kiev Kiev Tata Institute of Fundamental Research Mumbai 400005 Deutsches Elektronen–Synchrotron 22607 Hamburg Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe Laboratoire de l’Accélérateur Linéaire IN2P3/CNRS et Université Paris-Sud 11 Centre Scientifique d’Orsay F-91898 Orsay Cedex University of Louisville Louisville Kentucky 40292 Pacific Northwest National Laboratory Richland Washington 99352 Université de Strasbourg CNRS IPHC UMR 7178 67037 Strasbourg Indian Institute of Technology Madras Chennai 600036 University of Mississippi University Mississippi 38677 INFN Sezione di Roma Tre I-00146 Roma Institute of High Energy Physics Vienna 1050 Austria University of Hawaii Honolulu Hawaii 96822 Dipartimento di Fisica Università di Pisa I-56127 Pisa INFN Sezione di Pisa I-56127 Pisa Dipartimento di Fisica Università di Torino I-10125 Torino INFN Sezione di Torino I-10125 Torino H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 University of Maribor 2000 Maribor J. Stefan Institute 1000 Ljubljana Carnegie Mellon University Pittsburgh Pennsylvania 15213 Dipartimento di Matematica e Fisica Università di Roma Tre I-00146 Roma Dipartimento di Fisica Università di Perugia I-06123 Perugia INFN Sezione di Per

Theories beyond the standard model often predict the existence of an additional neutral boson, the Z′. Using data collected by the Belle II experiment during 2018 at the SuperKEKB collider, we perform the first searches for the invisible decay of a Z′ in the process e+e−→μ+μ−Z′ and of a lepton-flavor-violating Z′ in e+e−→e±μ∓Z′. We do not find any excess of events and set 90% credibility level upper limits on the cross sections of these processes. We translate the former, in the framework of an Lμ−Lτ theory, into upper limits on the Z′ coupling constant at the level of 5×10−2−1 for MZ′≤6 GeV/c2.

关键词： Extensions of gauge sector Invisible decays Particle dark matter Hypothetical gauge bosons Lepton colliders

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First Evidence for cos2β>0 and Resolution of the Cabibbo-Kobayashi-Maskawa Quark-Mixing Unitarity Triangle Ambiguity

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Physical Review Letters 2018年第26期121卷 261801-261801页

作者： I. Adachi T. Adye H. Ahmed J. K. Ahn H. Aihara S. Akar M. S. Alam J. Albert F. Anulli N. Arnaud D. M. Asner D. Aston H. Atmacan T. Aushev R. Ayad V. Babu I. Badhrees A. M. Bakich Sw. Banerjee V. Bansal R. J. Barlow G. Batignani A. Beaulieu P. Behera M. Bellis E. Ben-Haim D. Bernard F. U. Bernlochner S. Bettarini D. Bettoni A. J. Bevan V. Bhardwaj B. Bhuyan F. Bianchi M. Biasini J. Biswal V. E. Blinov M. Bomben A. Bondar G. R. Bonneaud A. Bozek C. Bozzi M. Bračko T. E. Browder D. N. Brown C. Bünger P. R. Burchat A. R. Buzykaev R. Calabrese A. Calcaterra G. Calderini S. Di Carlo M. Carpinelli C. Cartaro G. Casarosa R. Cenci D. S. Chao J. Chauveau R. Cheaib A. Chen C. Chen C. H. Cheng B. G. Cheon K. Chilikin K. Cho Y. Choi S. Choudhury M. Chrzaszcz G. Cibinetto D. Cinabro J. Cochran J. P. Coleman M. R. Convery G. Cowan R. Cowan L. Cremaldi S. Cunliffe N. Dash M. Davier C. L. Davis F. De Mori G. De Nardo A. G. Denig R. de Sangro B. Dey F. Di Lodovico S. Dittrich Z. Doležal J. Dorfan Z. Drásal V. P. Druzhinin W. Dunwoodie M. Ebert B. Echenard S. Eidelman G. Eigen A. M. Eisner S. Emery D. Epifanov J. A. Ernst R. Faccini J. E. Fast M. Feindt T. Ferber F. Ferrarotto F. Ferroni R. C. Field A. Filippi G. Finocchiaro E. Fioravanti K. T. Flood F. Forti M. Fritsch B. G. Fulsom E. Gabathuler D. Gamba R. Garg A. Garmash J. W. Gary I. Garzia V. Gaur A. Gaz M. Gelb T. J. Gershon L. Li Gioi M. A. Giorgi A. Giri R. Godang P. Goldenzweig B. Golob V. B. Golubev R. Gorodeisky W. Gradl M. T. Graham E. Grauges K. Griessinger A. V. Gritsan O. Grünberg Y. Guan E. Guido N. Guttman J. Haba A. Hafner T. Hara P. F. Harrison C. Hast K. Hayasaka H. Hayashii C. Hearty M. Heck M. T. Hedges M. Heß S. Hirose D. G. Hitlin K. Honscheid W.-S. Hou C.-L. Hsu Z. Huard C. Van Hulse D. E. Hutchcroft K. Inami G. Inguglia W. R. Innes A. Ishikawa R. Itoh Y. Iwasaki J. M. Izen W. W. Jacobs A. Jawahery C. P. Jessop S. Jia Y. Jin K. K. Joo T. Julius A. B. Kaliyar K. H. Kang G. Karyan R. Kass H. Kichimi D. Y. Kim J. B. Kim K. T. Kim S. H. Kim J. Kim P. Kim G. J. High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 Japan SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Japan Rutherford Appleton Laboratory Chilton Didcot Oxon OX11 0QX United Kingdom St. Francis Xavier University Antigonish Nova Scotia Canada B2G 2W5 Korea University Seoul 136-713 South Korea Department of Physics University of Tokyo Tokyo 113-0033 Japan Laboratoire de Physique Nucléaire et de Hautes Energies IN2P3/CNRS Université Pierre et Marie Curie-Paris6 Université Denis Diderot-Paris7 F-75252 Paris France State University of New York Albany New York 12222 USA University of Victoria Victoria British Columbia Canada V8W 3P6 INFN Sezione di Roma I-00185 Roma Italy Laboratoire de l’Accélérateur Linéaire IN2P3/CNRS et Université Paris-Sud 11 Centre Scientifique d’Orsay F-91898 Orsay Cedex France Brookhaven National Laboratory Upton New York 11973 USA SLAC National Accelerator Laboratory Stanford California 94309 USA University of South Carolina Columbia South Carolina 29208 USA Moscow Institute of Physics and Technology Moscow Region 141700 Russian Federation Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Kingdom of Saudi Arabia Tata Institute of Fundamental Research Mumbai 400005 India King Abdulaziz City for Science and Technology Riyadh 11442 Kingdom of Saudi Arabia School of Physics University of Sydney New South Wales 2006 Australia University of Louisville Louisville Kentucky 40292 USA Pacific Northwest National Laboratory Richland Washington 99352 USA University of Manchester Manchester M13 9PL United Kingdom INFN Sezione di Pisa I-56127 Pisa Italy Dipartimento di Fisica Università di Pisa I-56127 Pisa Italy Indian Institute of Technology Madras Chennai 600036 India Stanford University Stanford California 94305 USA Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS/IN2P3 F-91128 Palaiseau France INFN Sezione di Ferrara I-44122 Ferrara Italy Queen Mary Un

We present first evidence that the cosine of the CP-violating weak phase 2β is positive, and hence exclude trigonometric multifold solutions of the Cabibbo-Kobayashi-Maskawa (CKM) Unitarity Triangle using a time-dependent Dalitz plot analysis of B0→D(*)h0 with D→KS0π+π− decays, where h0∈{π0,η,ω} denotes a light unflavored and neutral hadron. The measurement is performed combining the final data sets of the BABAR and Belle experiments collected at the ϒ(4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain (471±3)×106BB¯ pairs recorded by the BABAR detector and (772±11)×106BB¯ pairs recorded by the Belle detector. The results of the measurement are sin2β=0.80±0.14(stat)±0.06(syst)±0.03(model) and cos2β=0.91±0.22(stat)±0.09(syst)±0.07(model). The result for the direct measurement of the angle β of the CKM Unitarity Triangle is β=[22.5±4.4(stat)±1.2(syst)±0.6(model)]°. The measurement assumes no direct CP violation in B0→D(*)h0 decays. The quoted model uncertainties are due to the composition of the D0→KS0π+π− decay amplitude model, which is newly established by performing a Dalitz plot amplitude analysis using a high-statistics e+e−→cc¯ data sample. CP violation is observed in B0→D(*)h0 decays at the level of 5.1 standard deviations. The significance for cos2β>0 is 3.7 standard deviations. The trigonometric multifold solution π/2−β=(68.1±0.7)° is excluded at the level of 7.3 standard deviations. The measurement resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle.

关键词： Hadronic decays Quark mixing Bottom mesons Charmed mesons CP violation Lepton colliders

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Study of e+e−→ϒ(1S,2S)η and e+e−→ϒ(1S)η′ at s=10.866 GeV with the Belle detector

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Physical Review D 2021年第11期104卷 112006-112006页

作者： E. Kovalenko A. Garmash P. Krokovny I. Adachi H. Aihara D. M. Asner V. Aulchenko T. Aushev R. Ayad V. Babu S. Bahinipati P. Behera J. Bennett M. Bessner T. Bilka J. Biswal A. Bobrov A. Bondar G. Bonvicini A. Bozek M. Bračko T. E. Browder M. Campajola L. Cao D. Červenkov M.-C. Chang B. G. Cheon K. Chilikin H. E. Cho K. Cho S.-J. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe S. Das G. De Nardo F. Di Capua Z. Doležal T. V. Dong S. Eidelman D. Epifanov T. Ferber A. Frey B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Giri P. Goldenzweig D. Greenwald K. Gudkova C. Hadjivasiliou T. Hara K. Hayasaka W.-S. Hou C.-L. Hsu T. Iijima K. Inami A. Ishikawa R. Itoh M. Iwasaki W. W. Jacobs Y. Jin K. K. Joo G. Karyan H. Kichimi C. Kiesling C. H. Kim D. Y. Kim K.-H. Kim S. H. Kim Y.-K. Kim K. Kinoshita P. Kodyš T. Konno A. Korobov S. Korpar P. Križan R. Kroeger T. Kuhr M. Kumar R. Kumar K. Kumara A. Kuzmin Y.-J. Kwon K. Lalwani J. S. Lange S. C. Lee Y. B. Li L. Li Gioi J. Libby K. Lieret D. Liventsev C. MacQueen M. Masuda T. Matsuda D. Matvienko M. Merola F. Metzner K. Miyabayashi R. Mizuk G. B. Mohanty M. Nakao A. Natochii L. Nayak M. Niiyama N. K. Nisar S. Nishida K. Ogawa S. Ogawa H. Ono P. Oskin P. Pakhlov G. Pakhlova S. Pardi H. Park S.-H. Park S. Patra S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik E. Prencipe M. T. Prim A. Rabusov M. Röhrken A. Rostomyan N. Rout G. Russo D. Sahoo Y. Sakai S. Sandilya A. Sangal T. Sanuki V. Savinov G. Schnell C. Schwanda Y. Seino K. Senyo M. E. Sevior C. Sharma J.-G. Shiu B. Shwartz A. Sokolov E. Solovieva M. Starič Z. S. Stottler M. Sumihama T. Sumiyoshi W. Sutcliffe M. Takizawa U. Tamponi K. Tanida F. Tenchini K. Trabelsi M. Uchida T. Uglov Y. Unno K. Uno S. Uno P. Urquijo Y. Usov R. Van Tonder G. Varner A. Vinokurova E. Waheed C. H. Wang M.-Z. Wang P. Wang M. Watanabe O. Werbycka E. Won W. Yan S. B. Yang H. Ye J. H. Yin Y. Yusa Z. P. Zhang V. Zhilich V. Zhukova 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 University of Tokyo Tokyo 113-0033 Brookhaven National Laboratory Upton New York 11973 National Research University Higher School of Economics Moscow 101000 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Deutsches Elektronen–Synchrotron 22607 Hamburg Indian Institute of Technology Bhubaneswar Satya Nagar 751007 Indian Institute of Technology Madras Chennai 600036 University of Mississippi University Mississippi 38677 University of Hawaii Honolulu Hawaii 96822 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 Faculty of Chemistry and Chemical Engineering University of Maribor 2000 Maribor INFN–Sezione di Napoli 80126 Napoli Università di Napoli Federico II 80126 Napoli University of Bonn 53115 Bonn Department of Physics Fu Jen Catholic University Taipei 24205 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 Yonsei University Seoul 03722 Gyeongsang National University Jinju 52828 Sungkyunkwan University Suwon 16419 Indian Institute of Technology Hyderabad Telangana 502285 Malaviya National Institute of Technology Jaipur Jaipur 302017 Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics Fudan University Shanghai 200443 II. Physikalisches Institut Georg-August-Universität Göttingen 37073 Göttingen Pacific Northwest National Laboratory Richland Washington 99352 Panjab University Chandigarh

We report the first observation of the processes e+e−→ϒ(1S,2S)η at s=10.866 GeV, with significance exceeding 10σ for both processes. The measured Born cross sections are σ(e+e−→ϒ(2S)η)=2.07±0.21±0.19 pb, and σ(e+e−→ϒ(1S)η)=0.42±0.08±0.04 pb. We also set the upper limit on the cross section of the process e+e−→ϒ(1S)η′ to be σ(e+e−→ϒ(1S)η′)<0.037 pb at 90% C.L. The results are obtained with the data sample collected with the Belle detector at the KEKB asymmetric-energy e+e− collider in the energy range from 10.63 to 11.02 GeV.

关键词： Hadronic decays Bottom mesons

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Measurement of cos2β in B0→D(*)h0 with D→KS0π+π− decays by a combined time-dependent Dalitz plot analysis of BaBar and Belle data

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Physical Review D 2018年第11期98卷 112012-112012页

作者： I. Adachi T. Adye H. Ahmed J. K. Ahn H. Aihara S. Akar M. S. Alam J. Albert F. Anulli N. Arnaud D. M. Asner D. Aston H. Atmacan T. Aushev R. Ayad I. Badhrees A. M. Bakich Sw. Banerjee V. Bansal R. J. Barlow G. Batignani A. Beaulieu P. Behera M. Bellis E. Ben-Haim D. Bernard F. U. Bernlochner S. Bettarini D. Bettoni A. J. Bevan V. Bhardwaj B. Bhuyan F. Bianchi M. Biasini J. Biswal V. E. Blinov M. Bomben A. Bondar G. R. Bonneaud A. Bozek C. Bozzi M. Bračko T. E. Browder D. N. Brown C. Bünger P. R. Burchat A. R. Buzykaev R. Calabrese A. Calcaterra G. Calderini S. Di Carlo M. Carpinelli C. Cartaro G. Casarosa R. Cenci D. S. Chao J. Chauveau R. Cheaib A. Chen C. Chen C. H. Cheng B. G. Cheon K. Chilikin K. Cho Y. Choi S. Choudhury M. Chrzaszcz G. Cibinetto D. Cinabro J. Cochran J. P. Coleman M. R. Convery G. Cowan R. Cowan L. Cremaldi S. Cunliffe N. Dash M. Davier C. L. Davis F. De Mori G. De Nardo A. G. Denig R. de Sangro B. Dey F. Di Lodovico S. Dittrich Z. Doležal J. Dorfan Z. Drásal V. P. Druzhinin W. Dunwoodie M. Ebert B. Echenard S. Eidelman G. Eigen A. M. Eisner S. Emery D. Epifanov J. A. Ernst R. Faccini J. E. Fast M. Feindt F. Ferrarotto F. Ferroni R. C. Field A. Filippi G. Finocchiaro E. Fioravanti K. T. Flood F. Forti M. Fritsch B. G. Fulsom E. Gabathuler D. Gamba R. Garg A. Garmash J. W. Gary I. Garzia V. Gaur A. Gaz M. Gelb T. J. Gershon L. Li Gioi M. A. Giorgi A. Giri R. Godang P. Goldenzweig B. Golob V. B. Golubev R. Gorodeisky W. Gradl M. T. Graham E. Grauges K. Griessinger A. V. Gritsan O. Grünberg E. Guido N. Guttman A. Hafner T. Hara P. F. Harrison C. Hast K. Hayasaka C. Hearty M. Heck M. T. Hedges M. Heß S. Hirose D. G. Hitlin K. Honscheid W.-S. Hou Z. Huard C. Van Hulse D. E. Hutchcroft K. Inami G. Inguglia W. R. Innes A. Ishikawa R. Itoh Y. Iwasaki J. M. Izen W. W. Jacobs A. Jawahery C. P. Jessop S. Jia Y. Jin K. K. Joo T. Julius A. B. Kaliyar K. H. Kang G. Karyan R. Kass H. Kichimi D. Y. Kim J. B. Kim K. T. Kim S. H. Kim J. Kim P. Kim G. J. King K. Kinoshita H. Koch P. Kodyš Yu. G. Kolomensky S. High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 Japan SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Japan Rutherford Appleton Laboratory Chilton Didcot Oxon OX11 0QX United Kingdom St. Francis Xavier University Antigonish Nova Scotia Canada B2G 2W5 Korea University Seoul 136-713 South Korea Department of Physics University of Tokyo Tokyo 113-0033 Japan Laboratoire de Physique Nucléaire et de Hautes Energies IN2P3/CNRS Université Pierre et Marie Curie-Paris6 Université Denis Diderot-Paris7 F-75252 Paris France State University of New York Albany New York 12222 USA University of Victoria Victoria British Columbia Canada V8W 3P6 INFN Sezione di Roma I-00185 Roma Italy Brookhaven National Laboratory Upton New York 11973 USA SLAC National Accelerator Laboratory Stanford California 94309 USA University of South Carolina Columbia South Carolina 29208 USA University of Mississippi University Mississippi 38677 USA Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Kingdom of Saudi Arabia King Abdulaziz City for Science and Technology Riyadh 11442 Kingdom of Saudi Arabia School of Physics University of Sydney New South Wales 2006 Australia University of Louisville Louisville Kentucky 40292 USA Pacific Northwest National Laboratory Richland Washington 99352 USA University of Manchester Manchester M13 9PL United Kingdom INFN Sezione di Pisa I-56127 Pisa Italy Dipartimento di Fisica Università di Pisa I-56127 Pisa Italy Indian Institute of Technology Madras Chennai 600036 India Universität Rostock D-18051 Rostock Germany Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS/IN2P3 F-91128 Palaiseau France INFN Sezione di Ferrara I-44122 Ferrara Italy Queen Mary University of London London E1 4NS United Kingdom Indian Institute of Science Education and Research Mohali SAS Nagar 140306 India Indian Institute of Technology Guwahati Assam 781039 India INFN Sezione di Torino I-10125

We report measurements of sin2β and cos2β using a time-dependent Dalitz plot analysis of B0→D(*)h0 with D→KS0π+π− decays, where the light unflavored and neutral hadron h0 is a π0, η, or ω meson. The analysis uses a combination of the final data sets of the BaBar and Belle experiments containing 471×106 and 772×106 BB¯ pairs collected at the ϒ(4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. We measure sin2β=0.80±0.14(stat)±0.06(syst)±0.03(model) and cos2β=0.91±0.22(stat)±0.09(syst)±0.07(model). The result for the direct measurement of the angle is β=(22.5±4.4(stat)±1.2(syst)±0.6(model))°. The last quoted uncertainties are due to the composition of the D0→KS0π+π− decay amplitude model, which is newly established by a Dalitz plot amplitude analysis of a high-statistics e+e−→cc¯ data sample as part of this analysis. We find the first evidence for cos2β>0 at the level of 3.7 standard deviations. The measurement excludes the trigonometric multifold solution π/2−β=(68.1±0.7)° at the level of 7.3 standard deviations and therefore resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle. The hypothesis of β=0° is ruled out at the level of 5.1 standard deviations, and thus CP violation is observed in B0→D(*)h0 decays. The measurement assumes no direct CP violation in B0→D(*)h0 decays.

关键词： CP violation

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Search for ϒ(1S,2S)→Zc+Zc(′)− and e+e−→Zc+Zc(′)− at s=10.52, 10.58, and 10.867 GeV

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Physical Review D 2018年第11期97卷 112004-112004页

作者： S. Jia C. P. Shen C. Z. Yuan I. Adachi H. Aihara S. Al Said D. M. Asner V. Aulchenko T. Aushev R. Ayad V. Babu I. Badhrees V. Bansal P. Behera C. Beleño B. Bhuyan T. Bilka J. Biswal A. Bozek M. Bračko D. Červenkov 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 S. Eidelman 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 T. Hara K. Hayasaka H. Hayashii M. T. Hedges S. Hirose W.-S. Hou T. Iijima K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki W. W. Jacobs I. Jaegle H. B. Jeon Y. Jin T. Julius G. Karyan 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 T. Kumita Y.-J. Kwon J. S. Lange I. S. Lee S. C. Lee L. K. Li Y. Li Y. B. Li L. Li Gioi J. Libby D. Liventsev M. Lubej T. Luo J. MacNaughton M. Masuda T. Matsuda M. Merola K. Miyabayashi H. Miyata R. Mizuk H. K. Moon R. Mussa E. Nakano M. Nakao T. Nanut K. J. Nath Z. Natkaniec M. Nayak M. Niiyama 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 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 T.-A. Shibata J.-G. Shiu B. Shwartz F. Simon A. Sokolov E. Solovieva S. Stanič M. Starič J. F. Strube M. Sumihama T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida F. Tenchini K. Trabelsi M. Uchida T. Uglov S. Uno P. Urquijo Y. Usov C. Van Hulse G. Varner A. Vinokurova V. Vorobyev A. Vossen B. Wang C. H. Wang M.-Z. Wang P. Wang X. L. Wang M. Watanabe E. Widmann E. Won H. Ye S. Zakharov Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov A. Zupanc Beihang University Beijing 100191 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 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 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 Pacific Northwest National Laboratory Richland Washington 99352 Indian Institute of Technology Madras Chennai 600036 II. Physikalisches Institut Georg-August-Universität Göttingen 37073 Göttingen 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 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 Deutsches Elektronen–Synchrotron 22607 Hamburg Indian Institute of Technology Bhubaneswar Satya Nagar 751007 LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay Panjab University Chandigarh 160014 Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 Inst

The first search for double charged charmoniumlike state production in ϒ(1S) and ϒ(2S) decays and in e+e− annihilation at s=10.52, 10.58, and 10.867 GeV is conducted using data collected with the Belle detector at the KEKB asymmetric energy electron-positron collider. No significant signals are observed in any of the studied modes, and the 90% credibility level upper limits on their product branching fractions in ϒ(1S) and ϒ(2S) decays [B(ϒ(1S,2S)→Zc+Zc(′)−)×B(Zc+→π++cc¯) (cc¯=J/ψ, χc1(1P), ψ(2S))] and the product of Born cross section and branching fraction for e+e−→Zc+Zc(′)− (σ(e+e−→Zc+Zc(′)−)×B(Zc+→π++cc¯)) at s=10.52, 10.58, and 10.867 GeV are determined. Here, Zc refers to the Zc(3900) and Zc(4200) observed in the πJ/ψ final state, the Zc1(4050) and Zc2(4250) in the πχc1(1P) final state, and the Zc(4050) and Zc(4430) in the πψ(2S) final state.

关键词： Exotic mesons Quarkonia

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Search for the decay B0→K*0τ+τ− at the Belle experiment

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Physical Review D 2023年第1期108卷 L011102-L011102页

作者： T. V. Dong T. Luo I. Adachi H. Aihara D. M. Asner H. Atmacan V. Aulchenko T. Aushev R. Ayad V. Babu S. Bahinipati P. Behera K. Belous F. Bernlochner M. Bessner B. Bhuyan T. Bilka J. Biswal A. Bobrov A. Bozek M. Bračko P. Branchini T. E. Browder A. Budano M. Campajola D. Červenkov M.-C. Chang P. Chang A. Chen B. G. Cheon K. Chilikin H. E. Cho K. Cho S.-J. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe T. Czank S. Das G. De Nardo G. De Pietro R. Dhamija F. Di Capua J. Dingfelder Z. Doležal S. Dubey D. Epifanov T. Ferber D. Ferlewicz B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig E. Graziani T. Gu K. Gudkova T. Hara O. Hartbrich K. Hayasaka M. Hernandez Villanueva W.-S. Hou C.-L. Hsu K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki W. W. Jacobs E.-J. Jang S. Jia Y. Jin K. K. Joo J. Kahn K. H. Kang H. Kichimi C. Kiesling C. H. Kim D. Y. Kim S. H. Kim Y.-K. Kim T. D. Kimmel P. Kodyš T. Konno A. Korobov S. Korpar E. Kovalenko P. Križan R. Kroeger P. Krokovny T. Kuhr R. Kulasiri M. Kumar R. Kumar K. Kumara A. Kuzmin Y.-J. Kwon M. Laurenza S. C. Lee J. 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 F. Metzner K. Miyabayashi R. Mizuk G. B. Mohanty M. Nakao A. Natochii L. Nayak M. Niiyama N. K. Nisar S. Nishida K. Nishimura S. Ogawa H. Ono Y. Onuki P. Oskin P. Pakhlov G. Pakhlova S. Pardi H. Park S.-H. Park S. Patra S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik V. Popov E. Prencipe M. T. Prim A. Rostomyan N. Rout G. Russo D. Sahoo S. Sandilya A. Sangal L. Santelj T. Sanuki V. Savinov G. Schnell J. Schueler C. Schwanda Y. Seino K. Senyo M. E. Sevior M. Shapkin C. Sharma J.-G. Shiu F. Simon E. Solovieva M. Starič M. Sumihama K. Sumisawa T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida F. Tenchini K. Trabelsi M. Uchida Y. Unno S. Uno R. Van Tonder G. Varner K. E. Varvell E. Waheed C. H. Wang E. Wang P. Wang M. Watanabe S. Watanuki O. Werbycka E. Won B. D. Yabsley W. Yan S. B. Yang H. Ye J. H. Yin Z. Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics Fudan University Shanghai 200443 China High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 Japan SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Japan Department of Physics University of Tokyo Tokyo 113-0033 Japan 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 National Research University Higher School of Economics Moscow 101000 Russia Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Saudi Arabia Deutsches Elektronen–Synchrotron 22607 Hamburg Germany Indian Institute of Technology Bhubaneswar Satya Nagar 751007 India Indian Institute of Technology Madras Chennai 600036 India Institute for High Energy Physics Protvino 142281 Russia University of Bonn 53115 Bonn Germany University of Hawaii Honolulu Hawaii 96822 USA Indian Institute of Technology Guwahati Assam 781039 India Faculty of Mathematics and Physics Charles University 121 16 Prague Czech Republic J. Stefan Institute 1000 Ljubljana Slovenia H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 Poland Faculty of Chemistry and Chemical Engineering University of Maribor 2000 Maribor Slovenia INFN - Sezione di Roma Tre I-00146 Roma Italy INFN - Sezione di Napoli I-80126 Napoli Italy Università di Napoli Federico II I-80126 Napoli Italy Department of Physics Fu Jen Catholic University Taipei 24205 Taiwan Department of Physics National Taiwan University Taipei 10617 Taiwan 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

This paper presents a search for the rare flavor-changing neutral current process B0→K*0τ+τ− using data taken with the Belle detector at the KEKB asymmetric energy e+e− collider. The analysis is based on the entire ϒ(4S) resonance data sample of 711 fb−1, corresponding to 772×106BB¯ pairs. In our search we fully reconstruct the companion B meson produced in the process e+e−→ϒ(4S)→BB¯ from its hadronic decay modes, and look for the decay B0→K*0τ+τ− in the rest of the event. No evidence for a signal is found. We report an upper limit on the branching fraction B(B0→K*0τ+τ−)<3.1×10−3 at 90% confidence level. This is the first direct limit on B(B0→K*0τ+τ−).

关键词： Branching fraction Flavor changing neutral currents Leptonic, semileptonic & radiative decays Particle decays Rare decays Bottom mesons Flavor symmetries Lepton colliders

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