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Physical Review D 2020年第5期101卷 052012-052012页

作者： K. Chu M.-Z. Wang I. Adachi H. Aihara S. Al Said D. M. Asner V. Aulchenko T. Aushev R. Ayad V. Babu I. Badhrees S. Bahinipati A. M. Bakich P. Behera C. Beleño J. Bennett V. Bhardwaj B. Bhuyan J. Biswal A. Bobrov G. Bonvicini A. Bozek M. Bračko M. Campajola L. Cao D. Červenkov P. Chang 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 F. Di Capua S. Di Carlo Z. Doležal T. V. Dong S. Eidelman D. Epifanov J. E. Fast T. Ferber A. Frey B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig B. Golob O. Hartbrich K. Hayasaka H. Hayashii W.-S. Hou C.-L. Hsu T. Iijima K. Inami A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs H. B. Jeon Y. Jin D. Joffe K. K. Joo G. Karyan T. Kawasaki D. Y. Kim S. H. Kim K. Kinoshita P. Kodyš S. Korpar P. Križan R. Kroeger P. Krokovny R. Kulasiri Y.-J. Kwon Y.-T. Lai I. S. Lee S. C. Lee L. K. Li L. Li Gioi J. Libby K. Lieret D. Liventsev T. Luo M. Masuda D. Matvienko M. Merola K. Miyabayashi R. Mizuk G. B. Mohanty T. Mori R. Mussa E. Nakano T. Nakano M. Nakao K. J. Nath M. Nayak N. K. Nisar S. Nishida K. Nishimura H. Ono Y. Onuki P. Oskin P. Pakhlov G. Pakhlova B. Pal T. Pang S. Pardi C. W. Park H. Park S.-H. Park S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen V. Popov E. Prencipe M. T. Prim P. K. Resmi M. Ritter A. Rostomyan N. Rout G. Russo D. Sahoo Y. Sakai S. Sandilya L. Santelj V. Savinov O. Schneider G. Schnell J. Schueler C. Schwanda Y. Seino K. Senyo M. E. Sevior C. P. Shen J.-G. Shiu E. Solovieva M. Starič Z. S. Stottler T. Sumiyoshi W. Sutcliffe M. Takizawa U. Tamponi K. Tanida F. Tenchini T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov G. Varner A. Vinokurova A. Vossen B. Wang C. H. Wang P. Wang X. L. Wang J. Wiechczynski E. Won S. B. Yang H. Ye J. Yelton J. H. Yin 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 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 Hamburg 22607 King Abdulaziz City for Science and Technology Riyadh 11442 Indian Institute of Technology Bhubaneswar Satya Nagar 751007 School of Physics University of Sydney New South Wales 2006 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 Indian Institute of Technology Guwahati Assam 781039 J. Stefan Institute Ljubljana 1000 Wayne State University Detroit Michigan 48202 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 University of Maribor Maribor 2000 INFN - Sezione di Napoli Napoli 80126 Università di Napoli Federico II 80055 Napoli Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie Karlsruhe 76131 Faculty of Mathematics and Physics Charles University Prague 121 16 Max-Planck-Institut für Physik Munich 80805 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

Using a data sample of 772×106 BB¯ pairs collected on the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e− collider, we report the observation of B0→pp¯π+π− and the first observation of B+→pp¯π+π0. We measure a decay branching fraction of (0.83±0.17±0.17)×10−6 in B0→pp¯π+π− for Mπ+π−<1.22 GeV/c2 with a significance of 5.5 standard deviations. The contribution from B0→pp¯K0 is excluded. We measure a decay branching fraction of (4.58±1.17±0.67)×10−6 for B+→pp¯π+π0 with Mπ+π0<1.3 GeV/c2 with a significance of 5.4 standard deviations. We study the difference of the Mpp¯ distributions in B0→pp¯π+π− and B+→pp¯π+π0.

关键词： Electroweak interaction Form factors Particle interactions Strong interaction

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Search for the decay Bs0→ηη

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Physical Review D 2022年第1期105卷 012007-012007页

作者： B. Bhuyan K. J. Nath J. Borah 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 V. Bhardwaj T. Bilka J. Biswal A. Bobrov A. Bozek M. Bračko T. E. Browder M. Campajola 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 F. Di Capua S. Di Carlo Z. Doležal T. V. Dong S. Dubey S. Eidelman J. E. Fast T. Ferber B. G. Fulsom V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig B. Golob J. Haba T. Hara O. Hartbrich K. Hayasaka H. Hayashii W.-S. Hou 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 K. H. Kang 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. Kumar A. Kuzmin Y.-J. Kwon J. S. Lange J. K. Lee J. Y. Lee S. C. Lee C. H. Li L. K. Li Y. B. Li L. Li Gioi J. Libby K. Lieret D. Liventsev P.-C. Lu T. Luo J. MacNaughton C. MacQueen M. Masuda D. Matvienko M. Merola K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty T. Mori R. Mussa T. Nakano M. Nakao M. Nayak M. Niiyama N. K. Nisar S. Nishida K. Ogawa S. Ogawa H. Ono Y. Onuki P. Pakhlov G. Pakhlova B. Pal T. Pang 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 A. J. Schwartz Y. Seino K. Senyo M. E. Sevior V. Shebalin C. P. Shen J.-G. Shiu E. Solovieva M. Starič T. Sumiyoshi W. Sutcliffe M. Takizawa U. Tamponi K. Tanida F. Tenchini K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov S. E. Vahsen R. Van Tonder G. Varner A. Vossen C. H. Wang M.-Z. Wang P. Wang J. Wiechczynski E. Won S. B. Yang H. Ye J. H. Yin Y. Yusa Z. P. Zhang V. Zhilich V. Zhukova Indian Institute of Technology Guwahati Assam 781039 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 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 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 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 Bhubaneswar Satya Nagar 751007 LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay Pacific Northwest National Laboratory Richland W

We report results from a search for the decay Bs0→ηη using 121.4 fb−1 of data collected at the ϒ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. We do not observe any signal and set an upper limit on the branching fraction of 14.3×10−5 at 90% confidence level. This result represents a significant improvement over the previous most stringent limit.

关键词： Bottom quark

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Observation of Ξ(1620)0 and Evidence for Ξ(1690)0 in Ξc+→Ξ−π+π+ Decays

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Physical Review Letters 2019年第7期122卷 072501-072501页

作者： M. Sumihama I. Adachi J. K. Ahn H. Aihara S. Al Said D. M. Asner H. Atmacan T. Aushev R. Ayad V. Babu I. Badhrees S. Bahinipati A. M. Bakich V. Bansal C. Beleño M. Berger V. Bhardwaj B. Bhuyan T. Bilka J. Biswal G. Bonvicini A. Bozek M. Bračko T. E. Browder D. Červenkov V. Chekelian A. Chen B. G. Cheon K. Chilikin K. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe T. Czank N. Dash S. Di Carlo Z. Doležal T. V. Dong Z. Drásal S. Eidelman D. Epifanov J. E. Fast 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 K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs H. B. Jeon S. Jia Y. Jin K. K. Joo T. Julius A. B. Kaliyar K. H. Kang G. Karyan Y. Kato 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 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 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 E. Nakano T. Nakano M. Nakao T. Nanut K. J. Nath Z. Natkaniec M. Niiyama N. K. Nisar S. Nishida 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 G. Russo D. Sahoo 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 A. Sokolov E. Solovieva M. Starič J. F. Strube T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida N. Taniguchi F. Tenchini M. Uchida T. Uglov S. Uno P. Urquijo S. E. Vahsen C. Van Hulse G. Varner V. Vorobyev A. Vossen B. Wang C. H. Wang M.-Z. Wang P. Wang X. L. Wang M. Watanabe S. Watanuki E. Widmann E. Won H. Ye J. Yelton C. Z. Yuan Y. Yusa S. Zakharov Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov Gifu University Gifu 501-1193 Research Center for Nuclear Physics Osaka University Osaka 567-0047 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 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 Indian Institute of Technology Bhubaneswar Satya Nagar 751007 School of Physics University of Sydney Sydney New South Wales 2006 Pacific Northwest National Laboratory Richland Washington 99352 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 Mohali 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 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 Deutsches Elektronen–Synchrotron 22607 Hamburg Department of P

We report the first observation of the double strange baryon Ξ(1620)0 in its decay to Ξ−π+ via Ξc+→Ξ−π+π+ decays based on a 980 fb−1 data sample collected with the Belle detector at the KEKB asymmetric-energy e+e− collider. The mass and width are measured to be 1610.4±6.0(stat)−4.2+6.1 (syst) MeV/c2 and 59.9±4.8(stat)−7.1+2.8(syst) MeV, respectively. We obtain 4.0σ evidence of the Ξ(1690)0 with the same data sample. These results shed light on the structure of hyperon resonances with strangeness S=−2.

关键词： Resonance reactions Hyperons

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Observation of the Radiative Decays of ϒ(1S) to χc1

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Physical Review Letters 2020年第12期124卷 122001-122001页

作者： P. Katrenko I. Adachi H. Aihara S. Al Said D. M. Asner T. Aushev I. Badhrees S. Bahinipati P. Behera C. Beleño J. Bennett V. Bhardwaj B. Bhuyan J. Biswal A. Bobrov G. Bonvicini M. Bračko 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 F. Di Capua S. Di Carlo Z. Doležal T. V. Dong S. Eidelman D. Epifanov J. E. Fast B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig B. Golob O. Grzymkowska O. Hartbrich K. Hayasaka H. Hayashii W.-S. Hou T. Iijima K. Inami A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs H. B. Jeon S. Jia Y. Jin D. Joffe K. K. Joo G. Karyan H. Kichimi D. Y. Kim K. T. Kim S. H. Kim K. Kinoshita P. Kodyš S. Korpar P. Križan R. Kroeger T. Kuhr I. S. Lee S. C. Lee P. Lewis Y. B. Li L. Li Gioi J. Libby K. Lieret C. MacQueen M. Masuda T. Matsuda D. Matvienko M. Merola K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty T. J. Moon T. Mori R. Mussa E. Nakano T. Nakano M. Nakao M. Nayak N. K. Nisar S. Nishida K. Nishimura H. Ono Y. Onuki P. Oskin P. Pakhlov G. Pakhlova T. Pang S. Pardi C. W. Park H. Park S.-H. Park S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen V. Popov E. Prencipe M. T. Prim M. Ritter A. Rostomyan N. Rout G. Russo D. Sahoo Y. Sakai S. Sandilya T. Sanuki V. Savinov O. Schneider G. Schnell J. Schueler C. Schwanda Y. Seino K. Senyo M. E. Sevior C. P. Shen J.-G. Shiu E. Solovieva M. Starič Z. S. Stottler T. Sumiyoshi W. Sutcliffe M. Takizawa U. Tamponi K. Tanida F. Tenchini K. Trabelsi M. Uchida S. Uehara T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov R. Van Tonder G. Varner A. Vossen B. Wang C. H. Wang M.-Z. Wang P. Wang X. L. Wang E. Won S. B. Yang H. Ye J. Yelton J. H. Yin C. Z. Yuan Y. Yusa Z. P. Zhang V. Zhilich V. Zhukova Moscow Institute of Physics and Technology Moscow Region 141700 P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 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 King Abdulaziz City for Science and Technology Riyadh 11442 Indian Institute of Technology Bhubaneswar Satya Nagar 751007 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 Indian Institute of Technology Guwahati Assam 781039 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 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 Faculty of Mathematics and Physics Charles University 121 16 Prague Max-Planck-Institut für Physik 80805 München National Central University Chung-li 32054 Department of Physics and Institute of Natural Sciences Hanyang University Seoul 04763 Korea Institute of Science and Technology Information Daejeon 34141 Gyeongsang National University Jinju 52828 Sungkyunkwan University Suwon 16419 Indian Institute of Technology Hyderabad Telangana 502285 Deutsches Elektronen–Synchrotron 22607 Hamburg LAL Université Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay 91898 Key Laboratory of Nuclear Physics and Ion-be

We report the first observation of the radiative decay of the ϒ(1S) into a charmonium state. The significance of the observed signal of ϒ(1S)→γχc1 is 6.3 standard deviations including systematics. The branching fraction is calculated to be B[ϒ(1S)→γχc1]=[4.7−1.8+2.4(stat)−0.5+0.4(sys)×10−5]. We also searched for ϒ(1S) radiative decays into χc0,2 and ηc(1S,2S), and set upper limits on their branching fractions. These results are obtained from a 24.9 fb−1 data sample collected with the Belle detector at the KEKB asymmetric-energy e+e− collider at a center-of-mass energy equal to the ϒ(2S) mass using ϒ(1S) tagging by the ϒ(2S)→ϒ(1S)π+π− transitions.

关键词： Leptonic, semileptonic & radiative decays Quarkonia

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Dalitz analysis of D0→K−π+η decays at Belle

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Physical Review D 2020年第1期102卷 012002-012002页

作者： Y. Q. Chen L. K. Li W. B. Yan I. Adachi H. Aihara S. Al Said D. M. Asner H. Atmacan V. Aulchenko T. Aushev R. Ayad V. Babu I. Badhrees S. Bahinipati P. Behera J. Bennett V. Bhardwaj T. Bilka J. Biswal A. Bozek M. Bračko T. E. Browder M. Campajola L. Cao D. Červenkov M.-C. Chang 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 G. De Nardo F. Di Capua Z. Doležal T. V. Dong S. Eidelman D. Epifanov J. E. Fast T. Ferber D. Ferlewicz B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig B. Golob Y. Guan O. Hartbrich K. Hayasaka H. Hayashii W.-S. Hou C.-L. Hsu K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs E.-J. Jang H. B. Jeon S. Jia Y. Jin K. K. Joo K. H. Kang G. Karyan T. Kawasaki D. Y. Kim S. H. Kim T. D. Kimmel K. Kinoshita P. Kodyš S. Korpar P. Križan R. Kroeger P. Krokovny T. Kuhr R. Kulasiri R. Kumar A. Kuzmin Y.-J. Kwon K. Lalwani J. S. Lange I. S. Lee S. C. Lee Y. B. Li L. Li Gioi J. Libby K. Lieret D. Liventsev J. MacNaughton C. MacQueen M. Masuda D. Matvienko M. Merola K. Miyabayashi R. Mizuk S. Mohanty M. Mrvar R. Mussa M. Nakao Z. Natkaniec M. Nayak S. Nishida S. Ogawa H. Ono P. Oskin P. Pakhlov G. Pakhlova S. Pardi H. Park S. Patra S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik V. Popov E. Prencipe M. T. Prim A. Rabusov M. Ritter M. Röhrken N. Rout G. Russo D. Sahoo Y. Sakai T. Sanuki V. Savinov O. Schneider G. Schnell J. Schueler C. Schwanda A. J. Schwartz Y. Seino K. Senyo M. E. Sevior M. Shapkin V. Shebalin J.-G. Shiu A. Sokolov E. Solovieva M. Starič Z. S. Stottler M. Sumihama T. Sumiyoshi W. Sutcliffe M. Takizawa K. Tanida F. Tenchini K. Trabelsi M. Uchida T. Uglov S. Uno P. Urquijo G. Varner V. Vorobyev E. Waheed C. H. Wang E. Wang M.-Z. Wang P. Wang M. Watanabe E. Won X. Xu S. B. Yang H. Ye J. H. Yin C. Z. Yuan Y. Yusa Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov Department of Modern Physics and State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China Hefei 230026 Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 University of Cincinnati Cincinnati Ohio 45221 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 Deutsches Elektronen–Synchrotron 22607 Hamburg King Abdulaziz City for Science and Technology Riyadh 11442 Indian Institute of Technology Bhubaneswar Satya Nagar 751007 Indian Institute of Technology Madras Chennai 600036 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 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 University of Bonn 53115 Bonn Department of Physics Fu Jen Catholic University Taipei 24205 Max-Planck-Institut für Physik 80805 München 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

We present the results of the first Dalitz plot analysis of the decay D0→K−π+η. The analysis is performed on a data set corresponding to an integrated luminosity of 953 fb−1 collected by the Belle detector at the asymmetric-energy e+e− KEKB collider. The Dalitz plot is well described by a combination of the six resonant decay channels K¯*(892)0η, K−a0(980)+, K−a2(1320)+, K¯*(1410)0η, K*(1680)−π+ and K2*(1980)−π+, together with Kπ and Kη S-wave components. The decays K*(1680)−→K−η and K2*(1980)−→K−η are observed for the first time. We measure ratio of the branching fractions, B(D0→K−π+η)B(D0→K−π+)=0.500±0.002(stat)±0.020(syst)±0.003(BPDG). Using the Dalitz fit result, the ratio B(K*(1680)→Kη)B(K*(1680)→Kπ) is measured to be 0.11±0.02(stat)−0.04+0.06(syst)±0.04(BPDG); this is much lower than the theoretical expectations (≈1) made under the assumption that K*(1680) is a pure 13D1 state. The product branching fraction B(D0→[K2*(1980)−→K−η]π+)=(2.2−1.9+1.7)×10−4 is determined. In addition, the πη′ contribution to the a0(980)± resonance shape is confirmed with 10.1σ statistical significance using the three-channel Flatté model. We also measure B(D0→K¯*(892)0η)=(1.41−0.12+0.13)%. This is consistent with, and more precise than, the current world average (1.02±0.30)%, deviates with a significance of more than 3σ from the theoretical predictions of (0.51–0.92)%.

关键词： Branching fraction Hadronic decays Charmed mesons

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Measurement of R(D) and R(D*) with a Semileptonic Tagging Method

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Physical Review Letters 2020年第16期124卷 161803-161803页

作者： G. Caria P. Urquijo I. Adachi H. Aihara S. Al Said D. M. Asner H. Atmacan T. Aushev V. Babu I. Badhrees S. Bahinipati A. M. Bakich P. Behera C. Beleño J. Bennett B. Bhuyan T. Bilka J. Biswal A. Bozek M. Bračko T. E. Browder M. Campajola D. Červenkov P. Chang R. Cheaib V. Chekelian A. Chen B. G. Cheon K. Chilikin H. E. Cho K. Cho Y. Choi S. Choudhury D. Cinabro S. Cunliffe N. Dash G. De Nardo F. Di Capua S. Di Carlo Z. Doležal T. V. Dong S. Eidelman D. Epifanov J. E. Fast T. Ferber D. Ferlewicz B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig D. Greenwald O. Grzymkowska Y. Guan O. Hartbrich K. Hayasaka H. Hayashii T. Higuchi 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 A. B. Kaliyar K. H. Kang G. Karyan T. Kawasaki H. Kichimi C. H. Kim D. Y. Kim H. J. Kim K. T. Kim S. H. Kim K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan R. Kroeger J.-F. Krohn P. Krokovny T. Kuhr R. Kumar Y.-J. Kwon J. S. Lange I. S. Lee J. K. Lee S. C. Lee L. K. Li Y. B. Li L. Li Gioi J. Libby K. Lieret D. Liventsev T. Luo C. MacQueen M. Masuda T. Matsuda D. Matvienko M. Merola F. Metzner K. Miyabayashi G. B. Mohanty T. J. Moon T. Mori R. Mussa K. R. Nakamura M. Nakao K. J. Nath M. Nayak N. K. Nisar S. Nishida K. Nishimura K. Ogawa H. Ono Y. Onuki P. Oskin P. Pakhlov G. Pakhlova B. Pal T. Pang H. Park S.-H. Park S. Patra S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen V. Popov E. Prencipe M. T. Prim A. Rabusov P. K. Resmi M. Ritter M. Rozanska G. Russo D. Sahoo Y. Sakai S. Sandilya L. Santelj T. Sanuki V. Savinov O. Schneider G. Schnell J. Schueler C. Schwanda A. J. Schwartz Y. Seino K. Senyo M. E. Sevior V. Shebalin J.-G. Shiu B. Shwartz F. Simon A. Sokolov E. Solovieva M. Starič Z. S. Stottler T. Sumiyoshi W. Sutcliffe M. Takizawa U. Tamponi K. Tanida F. Tenchini K. Trabelsi M. Uchida T. Uglov S. Uno Y. Usov S. E. Vahsen R. Van Tonder G. Varner K. E. Varvell A. Vossen E. Waheed B. Wang C. H. Wang M.-Z. Wan School of Physics University of Melbourne Victoria 3010 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 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 School of Physics University of Sydney New South Wales 2006 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 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 Department of Physics National Taiwan University Taipei 10617 Max-Planck-Institut für Physik 80805 München 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 Sungkyunkwan University Suwon 16419 Indian Institute of Technology Hyderabad Telangana 502285 Wayne State University Detroit Michigan 48202 LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay 91898 Key Laboratory of Nuclear

The experimental results on the ratios of branching fractions R(D)=B(B¯→Dτ−ν¯τ)/B(B¯→Dℓ−ν¯ℓ) and R(D*)=B(B¯→D*τ−ν¯τ)/B(B¯→D*ℓ−ν¯ℓ), where ℓ denotes an electron or a ... 详细信息

The experimental results on the ratios of branching fractions R(D)=B(B¯→Dτ−ν¯τ)/B(B¯→Dℓ−ν¯ℓ) and R(D*)=B(B¯→D*τ−ν¯τ)/B(B¯→D*ℓ−ν¯ℓ), where ℓ denotes an electron or a muon, show a long-standing discrepancy with the standard model predictions, and might hint at a violation of lepton flavor universality. We report a new simultaneous measurement of R(D) and R(D*), based on a data sample containing 772×106 BB¯ events recorded at the ϒ(4S) resonance with the Belle detector at the KEKB e+e− collider. In this analysis the tag-side B meson is reconstructed in a semileptonic decay mode and the signal-side τ is reconstructed in a purely leptonic decay. The measured values are R(D)=0.307±0.037±0.016 and R(D*)=0.283±0.018±0.014, where the first uncertainties are statistical and the second are systematic. These results are in agreement with the standard model predictions within 0.2, 1.1, and 0.8 standard deviations for R(D), R(D*), and their combination, respectively. This work constitutes the most precise measurements of R(D) and R(D*) performed to date as well as the first result for R(D) based on a semileptonic tagging method.

关键词： Branching fraction Electroweak interaction Leptonic, semileptonic & radiative decays Lepton colliders

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Observation of ϒ(2S)→γηb(1S) Decay

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Physical Review Letters 2018年第23期121卷 232001-232001页

作者： B. G. Fulsom T. K. Pedlar 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 V. Bansal P. Behera C. Beleño M. Berger V. Bhardwaj B. Bhuyan T. Bilka J. Biswal A. Bondar G. Bonvicini A. Bozek M. Bračko T. E. Browder L. Cao 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 J. Dingfelder Z. Doležal T. V. Dong Z. Drásal S. Eidelman D. Epifanov J. E. Fast T. Ferber 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 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 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 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 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 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 K. Sumisawa T. Sumiyoshi W. Sutcliffe M. Takizawa U. Tamponi K. Tanida F. Tenchini M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo S. E. Vahsen C. Van Hulse R. Van Tonder G. Varner A. Vinokurova V. Vorobyev A. Vossen B. Wang C. H. Wang P. Wang X. L. Wang M. Watanabe S. Watanuki E. Widmann E. Won H. Ye J. H. Yi Pacific Northwest National Laboratory Richland Washington 99352 Luther College Decorah Iowa 52101 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 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 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 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 Hyd

We report the observation of ϒ(2S)→γηb(1S) decay based on an analysis of the inclusive photon spectrum of 24.7 fb−1 of e+e− collisions at the ϒ(2S) center-of-mass energy collected with the Belle detector at the KEKB asymmetric-energy e+e− collider. We measure a branching fraction of B[ϒ(2S)→γηb(1S)]=(6.1−0.7−0.6+0.6+0.9)×10−4 and derive an ηb(1S) mass of 9394.8−3.1−2.7+2.7+4.5 MeV/c2, where the uncertainties are statistical and systematic, respectively. The significance of our measurement is greater than 7 standard deviations, constituting the first observation of this decay mode.

关键词： Branching fraction Leptonic, semileptonic & radiative decays Quarkonia Mass

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Measurement of the branching fractions of the B+→ηℓ+νℓ and B+→η′ℓ+νℓ decays with signal-side only reconstruction in the full q2 range

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Physical Review D 2022年第3期106卷 032013-032013页

作者： U. Gebauer C. Beleño A. Frey I. Adachi K. Adamczyk H. Aihara S. Al Said D. M. Asner H. Atmacan T. Aushev R. Ayad V. Babu S. Bahinipati P. Behera K. Belous J. Bennett M. Bessner V. Bhardwaj B. Bhuyan T. Bilka J. Biswal A. Bobrov G. Bonvicini A. Bozek M. Bračko T. E. Browder M. Campajola L. Cao D. Červenkov M.-C. Chang V. Chekelian 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 S. Das N. Dash G. De Nardo F. Di Capua J. Dingfelder Z. Doležal T. V. Dong S. Eidelman D. Epifanov T. Ferber D. Ferlewicz B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig B. Golob K. Gudkova C. Hadjivasiliou S. Halder T. Hara O. Hartbrich K. Hayasaka H. Hayashii M. T. Hedges W.-S. Hou C.-L. Hsu T. Iijima K. Inami A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs S. Jia Y. Jin C. W. Joo K. K. Joo J. Kahn A. B. Kaliyar K. H. Kang G. Karyan T. Kawasaki H. Kichimi C. Kiesling C. H. Kim D. Y. Kim S. H. Kim Y.-K. Kim K. Kinoshita P. Kodyš T. Konno A. Korobov S. Korpar E. Kovalenko P. Križan R. Kroeger P. Krokovny T. Kuhr M. Kumar R. Kumar K. Kumara A. Kuzmin Y.-J. Kwon K. Lalwani J. S. Lange I. S. Lee S. C. Lee P. Lewis 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. Mrvar R. Mussa M. Nakao Z. Natkaniec A. Natochii L. Nayak M. Nayak 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 E. Prencipe M. T. Prim M. V. Purohit M. Röhrken 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 B. Shwartz F. Simon E. Solovieva S. Stanič M. Starič Z. S. Stottler T. Sumiyoshi M. Takizawa U. Tamponi F. Tenchini K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo R. Van Tonder G. 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 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 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 Cincinnati Cincinnati Ohio 45221 Higher School of Economics (HSE) Moscow 101000 Deutsches Elektronen–Synchrotron 22607 Hamburg Indian Institute of Technology Bhubaneswar Satya Nagar 751007 Indian Institute of Technology Madras Chennai 600036 Institute for High Energy Physics Protvino 142281 University of Mississippi University Mississippi 38677 University of Hawaii Honolulu Hawaii 96822 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 Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 Wayne State University Detroit Michigan 48202 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 Max-Planck-Institut für Physik 80805 München 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 Yonsei University Seoul 03722 Gyeongsang National University Jinju 52828 Sungkyunkw

The branching fractions of the decays B+→ηℓ+νℓ and B+→η′ℓ+νℓ are measured, where ℓ is either an electron or a muon, using a data sample of 711 fb−1 containing 772×106BB¯ pairs collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. To reduce the dependence of the result on the form factor model, the measurement is performed over the entire q2 range. The resulting branching fractions are B(B+→ηℓ+νℓ)=(2.83±0.55(stat.)±0.34(syst.))×10−5 and B(B+→η′ℓ+νℓ)=(2.79±1.29(stat.)±0.30(syst.))×10−5.

关键词： Branching fraction Leptonic, semileptonic & radiative decays Bottom quark Lepton colliders

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Measurement of time-dependent CP violation in B0→KS0π0π0 decays

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Physical Review D 2019年第1期99卷 011102(R)-011102(R)页

作者： Y. Yusa 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 V. Bhardwaj B. Bhuyan J. Biswal A. Bozek M. Bračko T. E. Browder L. Cao D. Červenkov V. Chekelian A. Chen B. G. Cheon K. Chilikin S.-K. Choi Y. Choi D. Cinabro S. Cunliffe N. Dash S. Di Carlo T. V. Dong Z. Drásal S. Eidelman D. Epifanov J. E. Fast B. G. Fulsom R. Garg V. Gaur A. Garmash A. Giri P. Goldenzweig B. Golob Y. Guan J. Haba K. Hayasaka H. Hayashii S. Hirose K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs S. Jia Y. Jin K. K. Joo K. H. Kang T. Kawasaki 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 T. Kuhr R. Kumar 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 M. Merola K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty H. K. Moon E. Nakano M. Nakao T. Nanut K. J. Nath Z. Natkaniec N. K. Nisar S. Nishida K. Nishimura K. Ogawa S. Ogawa H. Ono G. Pakhlova B. Pal S. Pardi H. Park S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen V. Popov E. Prencipe A. Rostomyan G. Russo Y. Sakai S. Sandilya T. Sanuki V. Savinov O. Schneider G. Schnell C. Schwanda A. J. Schwartz Y. Seino K. Senyo O. Seon M. E. Sevior C. P. Shen T.-A. Shibata J.-G. Shiu M. Starič M. Sumihama T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida F. Tenchini M. Uchida T. Uglov Y. Unno S. Uno Y. Ushiroda Y. Usov C. Van Hulse R. Van Tonder G. Varner K. E. Varvell V. Vorobyev A. Vossen E. Waheed B. Wang C. H. Wang M.-Z. Wang P. Wang E. Won H. Ye J. H. Yin Z. P. Zhang V. Zhilich V. Zhulanov Niigata University Niigata 950-2181 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 Indian Institute of Technology Bhubaneswar Satya Nagar 751007 School of Physics University of Sydney New South Wales 2006 Pacific Northwest National Laboratory Richland Washington 99352 Indian Institute of Technology Madras Chennai 600036 Indian Institute of Science Education and Research Mohali SAS Nagar 140306 Indian Institute of Technology Guwahati Assam 781039 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 Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe Faculty of Mathematics and Physics Charles University 121 16 Prague 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 Gyeongsang National University Chinju 660-701 Sungkyunkwan University Suwon 440-746 Wayne State University Detroit Michigan 48202 Deutsches Elektronen–Synchrotron 22607 Hamburg LAL University Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Panjab University Chandigarh 160014 Virginia Polytechnic Inst

We report a measurement of time-dependent CP violation in B0→KS0π0π0 decays using a data sample of 772×106 BB¯ pairs collected by the Belle experiment running at the ϒ(4S) resonance at the KEKB e+e− collider. This decay proceeds mainly via a b→sdd¯ “penguin” amplitude. The results are sin2ϕ1eff=0.92−0.31+0.27 (stat.) ±0.11 (syst.) and A=0.28±0.21 (stat.) ±0.04 (syst.), which are the most precise measurements of CP violation in this decay mode to date. The value for the CP-violating parameter sin2ϕ1eff is consistent with that obtained using decay modes proceeding via a b→cc¯s “tree” amplitude.

关键词： Quark mixing Bottom mesons CP violation

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Azimuthal asymmetries of back-to-back π±−(π0, η, π±) pairs in e+e− annihilation

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Physical Review D 2019年第9期100卷 092008-092008页

作者： H. Li A. Vossen H. Aihara D. M. Asner V. Aulchenko T. Aushev V. Babu I. Badhrees A. M. Bakich J. Bennett V. Bhardwaj T. Bilka J. Biswal A. Bobrov M. Bračko M. Campajola L. Cao D. Červenkov V. Chekelian A. Chen B. G. Cheon H. E. Cho K. Cho Y. Choi S. Choudhury D. Cinabro S. Cunliffe F. Di Capua S. Di Carlo T. V. Dong S. Eidelman T. Ferber B. G. Fulsom V. Gaur A. Garmash A. Giri P. Goldenzweig O. Hartbrich K. Hayasaka H. Hayashii K. Huang K. Inami A. Ishikawa R. Itoh M. Iwasaki W. W. Jacobs E.-J. Jang S. Jia Y. Jin K. H. Kang G. Karyan D. Y. Kim S. H. Kim P. Kodyš S. Korpar D. Kotchetkov P. Križan R. Kroeger P. Krokovny Y.-J. Kwon S. C. Lee Y. B. Li L. Li Gioi J. Libby K. Lieret D. Liventsev T. Luo C. MacQueen M. Masuda T. Matsuda M. Merola K. Miyabayashi H. Miyata R. Mizuk R. Mussa T. Nakano M. Nakao M. Naruki K. J. Nath Z. Natkaniec S. Nishida H. Ono W. Ostrowicz P. Pakhlov G. Pakhlova B. Pal S. Pardi S. Patra S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen V. Popov E. Prencipe M. T. Prim G. Russo D. Sahoo Y. Sakai L. Santelj T. Sanuki V. Savinov O. Schneider G. Schnell J. Schueler C. Schwanda R. Seidl Y. Seino K. Senyo J.-G. Shiu F. Simon E. Solovieva M. Starič Z. S. Stottler M. Takizawa K. Tanida F. Tenchini M. Uchida T. Uglov S. Uno R. Van Tonder G. Varner B. Wang C. H. Wang M.-Z. Wang P. Wang M. Watanabe E. Won S. B. Yang H. Ye Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov Indiana University Bloomington Indiana 47408 Duke University Durham North Carolina 27708 Department of Physics University of Tokyo Tokyo 113-0033 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 Deutsches Elektronen–Synchrotron 22607 Hamburg Department of Physics Faculty of Science University of Tabuk Tabuk 71451 King Abdulaziz City for Science and Technology Riyadh 11442 School of Physics University of Sydney New South Wales 2006 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 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 Department of Physics and Institute of Natural Sciences Hanyang University Seoul 04763 Korea Institute of Science and Technology Information Daejeon 34141 Sungkyunkwan University Suwon 16419 Indian Institute of Technology Hyderabad Telangana 502285 Wayne State University Detroit Michigan 48202 LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay 91898 High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Pacific Northwest National Laboratory Richland Washington 99352 Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 University of Hawaii Honolulu Hawaii 96822 Niigata University Niigata 950-2181 Nara Women’s University Nara 630-8506 Depart

This work reports the first observation of azimuthal asymmetries around the thrust axis in e+e− annihilation of pairs of back-to-back charged pions in one hemisphere, and π0 and η mesons in the opposite hemisphere. These results are complemented by a new analysis of pairs of back-to-back charged pions. The π0 and η asymmetries rise with the relative momentum z of the detected hadrons as well as with the transverse momentum with respect to the thrust axis. These asymmetries are sensitive to the Collins fragmentation function H1⊥ and provide complementary information to previous measurements with charged pions and kaons in the final state. In particular, the η final states will provide additional information on the flavor structure of H1⊥. This is the first measurement of the explicit transverse-momentum dependence of the Collins fragmentation function from Belle data. It uses a dataset of 980.4 fb−1 collected by the Belle experiment at or near a center-of-mass energy of 10.58 GeV.

关键词： Fragmentation into hadrons Lepton-lepton interactions Polarization in interactions & scattering

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