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Measurement of the CKM matrix element |Vcb| from B0→D*−ℓ+νℓ at Belle

Physical Review D 2019年第5期100卷 052007-052007页

作者： E. Waheed P. Urquijo D. Ferlewicz I. Adachi K. Adamczyk H. Aihara S. Al Said D. M. Asner H. Atmacan T. Aushev R. Ayad V. Babu I. Badhrees V. Bansal P. Behera C. Beleño F. Bernlochner B. Bhuyan T. Bilka J. Biswal A. Bobrov G. Bonvicini A. Bozek M. Bračko T. E. Browder M. Campajola 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 S. Di Carlo Z. Doležal T. V. Dong D. Dossett S. Eidelman D. Epifanov J. E. Fast B. G. Fulsom R. Garg V. Gaur A. Garmash A. Giri P. Goldenzweig B. Golob O. Grzymkowska J. Haba T. Hara K. Hayasaka H. Hayashii M. T. Hedges W.-S. Hou C.-L. Hsu T. Iijima K. Inami G. Inguglia A. Ishikawa M. Iwasaki Y. Iwasaki W. W. Jacobs H. B. Jeon S. Jia Y. Jin D. Joffe K. K. Joo J. Kahn A. B. Kaliyar G. Karyan T. Kawasaki C. H. Kim D. Y. 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 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 M. Masuda D. Matvienko M. Merola F. Metzner K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty T. Mori R. Mussa I. Nakamura M. Nakao K. J. Nath Z. Natkaniec M. Nayak M. Niiyama N. K. Nisar S. Nishida K. Nishimura S. Ogawa H. Ono P. Pakhlov G. Pakhlova B. Pal S. Pardi H. Park S.-H. Park S. Paul R. Pestotnik L. E. Piilonen V. Popov E. Prencipe M. Prim A. Rostomyan G. Russo Y. Sakai M. Salehi S. Sandilya 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 A. Sokolov E. Solovieva S. Stanič M. Starič Z. S. Stottler J. F. Strube T. Sumiyoshi M. Takizawa K. Tanida F. Tenchini K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno Y. Usov G. Varner K. E. Varvell A. Vinokurova A. Vossen C. H. Wang M.-Z. Wang P. Wang E. Won S. B. Yang H. Ye Y. Yusa Z. P. Zhang V. Zhilich V. Zhukova 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 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 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 Pacific Northwest National Laboratory Richland Washington 99352 Indian Institute of Technology Madras Chennai 600036 II. Physikalisches Institut Georg-August-Universität Göttingen 37073 Göttingen University of Bonn 53115 Bonn 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 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 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 LAL Univ. Paris-Sud

We present a new measurement of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb| from B0→D*−ℓ+νℓ decays, reconstructed with the full Belle data set of 711 fb−1 integrated luminosity. Two form factor parametrizations, originally conceived by the Caprini-Lellouch-Neubert (CLN) and the Boyd, Grinstein and Lebed (BGL) groups, are used to extract the product F(1)ηEW|Vcb| and the decay form factors, where F(1) is the normalization factor and ηEW is a small electroweak correction. In the CLN parametrization we find F(1)ηEW|Vcb|=(35.06±0.15±0.56)×10−3, ρ2=1.106±0.031±0.007, R1(1)=1.229±0.028±0.009, R2(1)=0.852±0.021±0.006. For the BGL parametrization we obtain F(1)ηEW|Vcb|=(34.93±0.23±0.59)×10−3, which is consistent with the world average when correcting for F(1)ηEW. The branching fraction of B0→D*−ℓ+νℓ is measured to be B(B0→D*−ℓ+νℓ)=(4.90±0.02±0.16)%. We also present a new test of lepton flavor universality violation in semileptonic B decays, B(B0→D*−e+ν)B(B0→D*−μ+ν)=1.01±0.01±0.03. The errors quoted correspond to the statistical and systematic uncertainties, respectively. This is the most precise measurement of F(1)ηEW|Vcb| and form factors to date and the first experimental study of the BGL form factor parametrization in an experimental measurement.

关键词： Electroweak radiative corrections Flavor changing neutral currents Form factors Particle interactions W & Z bosons

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Search for Ω(2012)→KΞ(1530)→KπΞ at Belle

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Physical Review D 2019年第3期100卷 032006-032006页

作者： S. Jia C. P. Shen I. Adachi J. K. Ahn H. Aihara S. Al Said D. M. Asner T. Aushev R. Ayad V. Babu S. Bahinipati A. M. Bakich P. Behera C. Beleño J. Bennett M. Berger V. Bhardwaj 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 G. De Nardo F. Di Capua S. Di Carlo Z. Doležal T. V. Dong S. Eidelman D. Epifanov J. E. Fast B. G. Fulsom V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig B. Golob O. Grzymkowska O. Hartbrich K. Hayasaka H. Hayashii W.-S. Hou K. Huang T. Iijima K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs Y. Jin D. Joffe K. K. Joo A. B. Kaliyar K. H. Kang G. Karyan Y. Kato T. Kawasaki H. Kichimi 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 I. S. Lee J. K. Lee J. Y. Lee S. C. Lee L. K. Li Y. B. Li L. Li Gioi J. Libby K. Lieret D. Liventsev P.-C. Lu J. MacNaughton C. MacQueen M. Masuda T. Matsuda D. Matvienko J. T. McNeil M. Merola H. Miyata R. Mizuk T. Mori R. Mussa T. Nakano M. Nakao K. J. Nath M. Nayak M. Niiyama N. K. Nisar S. Nishida K. Nishimura K. Ogawa S. Ogawa H. Ono Y. Onuki W. Ostrowicz P. Pakhlov G. Pakhlova B. Pal T. Pang S. Pardi S.-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 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 R. Van Tonder G. Varner A. Vinokurova A. Vossen B. Wang C. H. Wang M.-Z. Wang P. Wang E. Won S. B. Yang H. Ye J. Yelton J. H. Yin C. Z. Yuan Y. Yusa Z. P. Zhang V. Zhilich Beihang University Beijing 100191 Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics Fudan University Shanghai 200443 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 Moscow Institute of Physics and Technology Moscow Region 141700 Deutsches Elektronen–Synchrotron 22607 Hamburg 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 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 Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 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 Su

Using data samples of e+e− collisions collected at the ϒ(1S), ϒ(2S), and ϒ(3S) resonances with the Belle detector, we search for the three-body decay of the Ω(2012) baryon to KπΞ. This decay is predicted to dominate for models describing the Ω(2012) as a KΞ(1530) molecule. No significant Ω(2012) signals are observed in the studied channels, and 90% credibility level upper limits on the ratios of the branching fractions relative to KΞ decay modes are obtained.

关键词： Hadronic decays Baryons Bottom mesons Exotic baryons

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Evidence for B+→hcK+ and observation of ηc(2S)→pp¯π+π−

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Physical Review D 2019年第1期100卷 012001-012001页

作者： K. Chilikin I. Adachi D. M. Asner V. Aulchenko T. Aushev R. Ayad V. Babu I. Badhrees V. Bansal P. Behera C. Beleño M. Berger V. Bhardwaj T. Bilka J. Biswal A. Bobrov A. Bondar A. Bozek M. Bračko T. E. Browder M. Campajola L. Cao D. Červenkov V. Chekelian A. Chen B. G. Cheon K. Cho S.-K. Choi Y. Choi D. Cinabro S. Cunliffe 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 M. Gelb A. Giri P. Goldenzweig O. Grzymkowska J. Haba T. Hara K. Hayasaka H. Hayashii W.-S. Hou C.-L. Hsu K. Inami A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs S. Jia Y. Jin D. Joffe K. K. Joo T. Julius A. B. Kaliyar G. Karyan Y. Kato C. Kiesling C. H. Kim D. Y. Kim S. H. Kim K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov R. Kroeger P. Krokovny R. Kulasiri R. Kumar Y.-J. Kwon K. Lalwani J. S. Lange J. K. Lee J. Y. Lee S. C. Lee L. K. Li Y. B. Li L. Li Gioi J. Libby D. Liventsev P.-C. Lu T. Luo J. MacNaughton C. MacQueen M. Masuda T. Matsuda D. Matvienko M. Merola K. Miyabayashi R. Mizuk G. B. Mohanty T. Mori M. Nakao K. J. Nath M. Nayak M. Niiyama N. K. Nisar S. Nishida K. Nishimura 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 M. Ritter A. Rostomyan G. Russo Y. Sakai M. Salehi S. Sandilya T. Sanuki V. Savinov O. Schneider G. Schnell C. Schwanda Y. Seino K. Senyo M. E. Sevior C. P. Shen J.-G. Shiu B. Shwartz F. Simon A. Sokolov E. Solovieva M. Starič Z. S. Stottler J. F. Strube T. Sumiyoshi W. Sutcliffe M. Takizawa U. Tamponi K. Tanida F. Tenchini K. Trabelsi M. Uchida S. Uno P. Urquijo Y. Usov R. Van Tonder G. Varner A. Vinokurova 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 J. Zhang Z. P. Zhang V. Zhilich V. Zhukova 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 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 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Tata Institute of Fundamental Research Mumbai 400005 King Abdulaziz City for Science and Technology Riyadh 11442 Saudi Arabia 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 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana Slovenia 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 Korea Institute of Science and Technology Information Daejeon 305-806 Gyeongsang National University Chinju 660-701 Sungkyunkwan University Suwon 440-746 Wayne State University Detroit Michigan 48202 Deutsches Elektronen–Synchrotron 22607 Hamburg LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay Panjab University Chandigarh 160014 Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 Indian Institute of Technology Hyderabad Telangana

A search for the decays B+→hcK+ and B0→hcKS0 is performed. Evidence for the decay B+→hcK+ is found; its significance is 4.8σ. No evidence is found for B0→hcKS0. The branching fraction for B+→hcK+ is measured to be (3.7−0.9+1.0 −0.8+0.8)×10−5; the upper limit for the B0→hcKS0 branching fraction is 1.4×10−5 at 90% C.L. In addition, a study of the pp¯π+π− invariant mass distribution in the channel B+→(pp¯π+π−)K+ results in the first observation of the decay ηc(2S)→pp¯π+π− with 12.1σ significance. The analysis is based on the 711 fb−1 data sample collected by the Belle detector at the asymmetric-energy e+e− collider KEKB at the ϒ(4S) resonance.

关键词： Branching fraction Hadronic decays Bottom mesons Quarkonia

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Search for the decay Bs0→η′η

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Physical Review D 2021年第3期104卷 L031101-L031101页

作者： N. K. Nisar V. Savinov I. Adachi H. Aihara S. Al Said D. M. Asner H. Atmacan T. Aushev R. Ayad V. Babu S. Bahinipati P. Behera J. Bennett M. Bessner V. Bhardwaj B. Bhuyan T. Bilka J. Biswal G. Bonvicini A. Bozek M. Bračko T. E. Browder M. Campajola 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 S. Das N. Dash G. De Nardo R. Dhamija F. Di Capua Z. Doležal T. V. Dong S. Dubey S. Eidelman D. Epifanov T. Ferber D. Ferlewicz A. Frey B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig Y. Guan K. Gudkova C. Hadjivasiliou S. Halder T. Hara O. Hartbrich K. Hayasaka H. Hayashii M. T. Hedges 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 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 R. Mizuk G. B. Mohanty S. Mohanty M. Nakao A. Natochii L. Nayak M. Nayak 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 T. Podobnik E. Prencipe M. T. Prim M. Röhrken A. Rostomyan N. Rout G. Russo D. Sahoo S. Sandilya A. Sangal L. Santelj T. Sanuki G. Schnell J. Schueler C. Schwanda Y. Seino K. Senyo M. E. Sevior M. Shapkin C. Sharma C. P. Shen J.-G. Shiu B. Shwartz F. Simon E. Solovieva S. Stanič 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 R. Van Tonder G. Varner A. Vossen E. Waheed C. H. Wang M.-Z. Wang P. Wang X. L. Wang S. Watanuki E. Won X. Xu B. D. Yab Brookhaven National Laboratory Upton New York 11973 USA University of Pittsburgh Pittsburgh Pennsylvania 15260 USA 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 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 University of Cincinnati Cincinnati Ohio 45221 USA 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 Mississippi University Mississippi 38677 USA University of Hawaii Honolulu Hawaii 96822 USA Indian Institute of Science Education and Research Mohali SAS Nagar 140306 India 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 Wayne State University Detroit Michigan 48202 USA H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 Poland University of Maribor 2000 Maribor Slovenia INFN—Sezione di Napoli 80126 Napoli Italy Università di Napoli Federico II 80126 Napoli Italy Department of Physics Fu Jen Catholic University Taipei 24205 Republic of China 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 Gyeongsang National University Jinju 52828 South Korea Sungkyunkwan University Suwon 16419 Sout

We report the results of the first search for the decay Bs0→η′η 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 observe no signifi... 详细信息

关键词： Hadronic decays Rare decays

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Study of B¯0→D+h−(h=K/π) decays at Belle

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Physical Review D 2022年第1期105卷 012003-012003页

作者： E. Waheed P. Urquijo I. Adachi H. Aihara S. Al Said D. M. Asner H. Atmacan V. Aulchenko T. Aushev S. Bahinipati P. Behera K. Belous J. Bennett M. Bessner V. Bhardwaj B. Bhuyan T. Bilka J. Biswal A. Bobrov D. Bodrov J. Borah 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 S. Das G. De Nardo G. De Pietro R. Dhamija F. Di Capua Z. Doležal T. V. Dong D. Epifanov T. Ferber D. Ferlewicz B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Giri P. Goldenzweig B. Golob E. Graziani T. Gu Y. Guan K. Gudkova C. Hadjivasiliou S. Halder 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 S. Jia Y. Jin K. K. Joo A. B. Kaliyar K. H. Kang H. Kichimi C. H. Kim D. Y. Kim K.-H. Kim K. T. Kim Y.-K. Kim K. Kinoshita P. Kodyš T. Konno A. Korobov S. Korpar E. Kovalenko P. Križan R. Kroeger P. Krokovny M. Kumar R. Kumar K. Kumara Y.-J. Kwon Y.-T. Lai J. S. Lange 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 M. Merola F. Metzner K. Miyabayashi R. Mizuk G. B. Mohanty R. Mussa M. Nakao A. Natochii L. Nayak M. Nayak M. Niiyama N. K. Nisar S. Nishida S. Ogawa H. Ono P. Oskin P. Pakhlov G. Pakhlova T. Pang H. Park S.-H. Park A. Passeri S. Patra 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 S. Sandilya L. Santelj T. Sanuki V. Savinov G. Schnell C. Schwanda A. J. Schwartz Y. Seino K. Senyo M. E. Sevior M. Shapkin C. Sharma C. P. Shen J.-G. Shiu F. Simon J. B. Singh A. Sokolov E. Solovieva M. Starič Z. S. Stottler J. F. Strube 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 Y. Usov S. E. Vahsen R. Van Tonder G. Varner K. E. Varvell A. Vinokurova C. H. Wan High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 School of Physics University of Melbourne Victoria 3010 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 Cincinnati Cincinnati Ohio 45221 Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 National Research University Higher School of Economics Moscow 101000 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 P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 Faculty of Chemistry and Chemical Engineering University of Maribor 2000 Maribor INFN—Sezione di Roma Tre I-00146 Roma INFN—Sezione di Napoli I-80126 Napoli Università di Napoli Federico II I-80126 Napoli Department of Physics Fu Jen Catholic University Taipei 24205 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 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 Hyderaba

We present a measurement of the branching fractions of the Cabibbo favored B¯0→D+π− and the Cabibbo suppressed B¯0→D+K− decays. We find B(B¯0→D+π−)=(2.48±0.01±0.09±0.04)×10−3 and B(B¯0→D+K−)=(2.03±0.05±0.07±0.03)×10−4 decays, where the first uncertainty is statistical, the second is systematic, and the third uncertainty is due to the D+→K−π+π+ branching fraction. The ratio of branching fractions of B¯0→D+K− and B¯0→D+π− is measured to be RD=[8.19±0.20(stat)±0.23(syst)]×10−2. These measurements are performed using the full Belle dataset, which corresponds to 772×106BB¯ pairs and use the Belle II software framework for data analysis.

关键词： Form factors Particle decays Particle interactions Particle mixing & oscillations W & Z bosons

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Transverse momentum dependent production cross sections of charged pions, kaons and protons produced in inclusive e+e− annihilation at s=10.58 GeV

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Physical Review D 2019年第11期99卷 112006-112006页

作者： R. Seidl I. Adachi J. K. Ahn H. Aihara D. M. Asner V. Aulchenko T. Aushev R. Ayad A. M. Bakich V. Bansal P. Behera C. Beleño M. Berger V. Bhardwaj T. Bilka J. Biswal A. Bobrov A. Bozek M. Bračko L. Cao D. Červenkov 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 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 O. Grzymkowska K. Hayasaka H. Hayashii W.-S. Hou T. Iijima K. Inami A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs S. Jia Y. Jin D. Joffe K. K. Joo T. Julius A. B. Kaliyar T. Kawasaki H. Kichimi C. Kiesling C. H. Kim D. Y. Kim H. J. Kim J. B. Kim S. H. Kim P. Kodyš S. Korpar D. Kotchetkov P. Križan R. Kroeger P. Krokovny T. Kuhr R. Kulasiri A. Kuzmin Y.-J. Kwon K. Lalwani J. S. Lange I. S. Lee J. K. Lee J. Y. Lee S. C. Lee D. Levit C. H. Li L. K. Li Y. B. Li L. Li Gioi J. Libby D. Liventsev M. Lubej T. Luo J. MacNaughton M. Masuda T. Matsuda D. Matvienko M. Merola K. Miyabayashi R. Mizuk S. Mohanty T. Mori R. Mussa E. Nakano T. Nakano M. Nakao K. J. Nath Z. Natkaniec M. Nayak S. Nishida K. Nishimura S. Ogawa H. Ono Y. Onuki P. Pakhlov G. Pakhlova B. Pal S. Pardi 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 Y. Sakai M. Salehi S. Sandilya L. Santelj T. Sanuki O. Schneider G. Schnell J. Schueler C. Schwanda Y. Seino K. Senyo M. E. Sevior V. Shebalin C. P. Shen T.-A. Shibata 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 Y. Tao F. Tenchini M. Uchida S. Uehara T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov R. Van Tonder G. Varner A. Vossen E. Waheed B. Wang C. H. Wang M.-Z. Wang P. Wang X. L. Wang M. Watanabe E. Won S. B. Yang H. Ye J. Yelton J. H. Yin C. Z. Yuan Z. P. Zhang V. Zhilich V. Zhukova RIKEN BNL Research Center Upton New York 11973 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 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 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 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 Sahibzada Ajit Singh Nagar Punjab 140306 India 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 Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe 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 Wayne State University Detroit Michigan 48202 Deutsches Elektronen-Synchrotron 22607 Hamburg LAL Université Paris-Sud CNRS/IN2P3 Université Paris-Saclay 91400 Orsay Panjab University Chandigarh 160014 Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 Faculty of Mathematics and Physics University of Ljubljana 1000 Ljubljana Niigata University Niigata 950-2

We report measurements of the production cross sections of charged pions, kaons, and protons as a function of fractional energy, the event-shape variable called thrust, and the transverse momentum with respect to the thrust axis. These measurements access the transverse momenta created in the fragmentation process, which are of critical importance to the understanding of any transverse-momentum-dependent distribution and fragmentation functions. The low transverse-momentum part of the cross sections can be well described by Gaussians in transverse momentum as is generally assumed but the fractional-energy dependence is nontrivial and different hadron types have varying Gaussian widths. The width of these Gaussians decreases with thrust and shows an initially rising, then decreasing fractional-energy dependence. The widths for pions and kaons are comparable within uncertainties, while those for protons are significantly narrower. These single-hadron cross sections and Gaussian widths are obtained from a 558 fb−1 data sample collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider.

关键词： Fragmentation into hadrons Particle production Quantum chromodynamics Lepton colliders

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Observation of e+e−→γχc1 and search for e+e−→γχc0, γχc2, and γηc at s near 10.6 GeV at Belle

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Physical Review D 2018年第9期98卷 092015-092015页

作者： S. Jia X. L. Wang C. P. Shen C. Z. Yuan I. Adachi H. Aihara S. Al Said D. M. Asner H. Atmacan V. Aulchenko T. Aushev R. Ayad V. Babu V. Bansal P. Behera C. Beleño M. Berger 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 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 M. Gelb A. Giri P. Goldenzweig D. Greenwald J. Haba 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 D. Joffe J. Kahn A. B. Kaliyar G. Karyan T. Kawasaki H. Kichimi C. Kiesling D. Y. Kim H. J. Kim J. B. 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 K. Lalwani J. S. Lange I. S. Lee J. Y. Lee S. C. Lee C. H. Li L. K. Li Y. B. Li L. Li Gioi J. Libby Z. Liptak D. Liventsev P.-C. Lu M. Lubej J. MacNaughton M. Masuda T. Matsuda D. Matvienko M. Merola H. Miyata R. Mizuk T. Mori R. Mussa E. Nakano M. Nakao K. J. Nath M. Nayak N. K. Nisar S. Nishida S. Ogawa S. L. Olsen H. Ono Y. Onuki W. Ostrowicz G. Pakhlova B. Pal S. Pardi 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 M. E. Sevior T.-A. Shibata J.-G. Shiu F. Simon A. Sokolov E. Solovieva M. Starič Z. S. Stottler J. F. Strube T. Sumiyoshi W. Sutcliffe M. Takizawa K. Tanida Y. Tao F. Tenchini M. Uchida S. Uehara T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov R. Van Tonder G. Varner K. E. Varvell V. Vorobyev E. Waheed B. Wang C. H. Wang M.-Z. Wang P. Wang S. Watanuki E. Widmann E. Won H. Yamamoto S. B. Yang H. Ye J. H. Yin Y. Yusa 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 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 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 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 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 Technology Information Daejeon 305-806 Gyeongsang National University Chinju 660-701 Sungkyunkwan University Suwon 440-746 Indian In

Using data samples of 89.5 fb−1, 711.0 fb−1, and 121.4 fb−1 collected with the Belle detector at the KEKB asymmetric-energy e+e− collider at center-of-mass energies 10.52, 10.58, and 10.867 GeV, respectively, we study the exclusive reactions e+e−→γχcJ (J=0, 1, 2) and e+e−→γηc. A significant γχc1 signal is observed for the first time at s=10.58 GeV with a significance of 5.1σ including systematic uncertainties. No significant excesses for γχc0, γχc2, and γηc final states are found, and we set 90% credibility level upper limits on the Born cross sections (σB) at 10.52 GeV, 10.58 GeV, and 10.867 GeV. Together with cross sections measured by BESIII at lower center-of-mass energies, the energy dependency of σB(e+e−→γχc1) is obtained.

关键词： Nonrelativistic QCD Perturbative QCD Quantum chromodynamics

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Study of γγ→γψ(2S) at Belle

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Physical Review D 2022年第11期105卷 112011-112011页

作者： X. L. Wang B. S. Gao W. J. Zhu I. Adachi H. Aihara S. Al Said D. M. Asner H. Atmacan V. Aulchenko T. Aushev R. Ayad V. Babu S. Bahinipati P. Behera V. Bhardwaj B. Bhuyan T. Bilka J. Biswal A. Bobrov G. Bonvicini A. Bozek M. Bračko M. Campajola 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 S. Das G. De Nardo R. Dhamija F. Di Capua Z. Doležal T. V. Dong S. Eidelman T. Ferber D. Ferlewicz A. Frey B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig B. Golob C. Hadjivasiliou 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 K. H. Kang T. Kawasaki C. Kiesling C. H. Kim D. Y. Kim S. H. Kim Y.-K. Kim P. Kodyš T. Konno A. Korobov S. Korpar E. Kovalenko P. Križan R. Kroeger P. Krokovny R. Kulasiri M. Kumar R. Kumar K. Kumara A. Kuzmin Y.-J. Kwon K. Lalwani J. S. Lange I. S. Lee S. C. Lee P. Lewis 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. Mrvar R. Mussa M. Nakao Z. Natkaniec A. Natochii L. Nayak 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 T. Podobnik V. Popov E. Prencipe M. T. Prim M. Röhrken A. Rostomyan N. Rout G. Russo D. Sahoo S. Sandilya A. Sangal L. Santelj T. Sanuki G. Schnell C. Schwanda Y. Seino K. Senyo M. E. Sevior M. Shapkin C. Sharma C. P. Shen J.-G. Shiu B. Shwartz F. Simon J. B. Singh A. Sokolov E. Solovieva S. Stanič M. Starič Z. S. Stottler M. Sumihama M. Takizawa U. Tamponi F. Tenchini M. Uchida S. Uehara T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov R. Van Tonder G. Varner A. Vossen E. Waheed C. H. Wang M.-Z. Wang P. Wang M. Watanabe S. Watanuki O. Werbycka E. Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics Fudan University Shanghai 200443 People’s Republic of 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 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 Russian Federation Novosibirsk State University Novosibirsk 630090 Russian Federation Higher School of Economics (HSE) Moscow 101000 Russian Federation Deutsches Elektronen–Synchrotron 22607 Hamburg Germany Indian Institute of Technology Bhubaneswar Bhubaneswar 752050 India Indian Institute of Technology Madras Chennai 600036 India Indian Institute of Science Education and Research Mohali Sahibzada Ajit Singh Nagar 140306 India Indian Institute of Technology Guwahati Assam 781039 India Faculty of Mathematics and Physics Charles University 121 16 Prague The Czech Republic J. Stefan Institute 1000 Ljubljana Slovenia Wayne State University Detroit Michigan 48202 USA 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 Napoli 80126 Napoli Italy Università di Napoli Federico II 80126 Napoli Italy Department of Physics Fu Jen Catholic University Taipei 24205 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 Scien

Using 980 fb−1 of data at and around the ϒ(nS) (n=1, 2, 3, 4, 5) resonances collected with the Belle detector at the KEKB asymmetric-energy e+e− collider, the two-photon process γγ→γψ(2S) is studied from the threshold to 4.2 GeV for the first time. Two structures are seen in the invariant mass distribution of γψ(2S): one at MR1=3922.4±6.5±2.0 MeV/c2 with a width of ΓR1=22±17±4 MeV, and another at MR2=4014.3±4.0±1.5 MeV/c2 with a width of ΓR2=4±11±6 MeV; the signals are parametrized with the incoherent sum of two Breit-Wigner functions. The first structure is consistent with the X(3915) or the χc2(3930), and the local statistical significance is determined to be 3.1σ with the systematic uncertainties included. The second matches none of the known charmonium or charmoniumlike states, and its global significance is determined to be 2.8σ including the look-elsewhere effect. The production rates are ΓγγB(R1→γψ(2S))=9.8±3.6±1.3 eV assuming (JPC,|λ|)=(0++,0) or 2.0±0.7±0.2 eV with (2++,2) for the first structure and ΓγγB(R2→γψ(2S))=6.2±2.2±0.8 eV with (0++,0) or 1.2±0.4±0.2 eV with (2++,2) for the second. Here, the first errors are statistical and the second systematic, and λ is the helicity.

关键词： Particle interactions

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Evidence for the decay B0→pp¯π0

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Physical Review D 2019年第9期99卷 091104(R)-091104(R)页

作者： B. Pal I. Adachi K. Adamczyk H. Aihara D. M. Asner H. Atmacan V. Aulchenko T. Aushev R. Ayad V. Babu I. Badhrees V. Bansal P. Behera C. Beleño M. Berger V. Bhardwaj 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 K. Cho S.-K. Choi Y. Choi D. Cinabro S. Cunliffe S. Di Carlo Z. Doležal T. V. Dong D. Dossett 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 J. Haba T. Hara 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 S. Jia Y. Jin D. Joffe K. K. Joo A. B. Kaliyar G. Karyan H. Kichimi C. Kiesling C. H. Kim D. Y. Kim K. T. Kim S. H. Kim K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan R. Kroeger P. Krokovny R. Kulasiri Y.-J. Kwon J. Y. Lee S. C. Lee L. K. Li Y. B. Li L. Li Gioi J. Libby D. Liventsev P.-C. Lu T. Luo J. MacNaughton C. MacQueen M. Masuda T. Matsuda D. Matvienko M. Merola K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty M. Nakao K. J. Nath M. Nayak N. K. Nisar S. Nishida K. Nishimura S. Ogawa H. Ono Y. Onuki P. Pakhlov G. Pakhlova S. Pardi S.-H. Park S. Patra S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen V. Popov E. Prencipe A. Rostomyan G. Russo Y. Sakai M. Salehi S. Sandilya T. Sanuki V. Savinov O. Schneider G. Schnell J. Schueler C. Schwanda A. J. Schwartz Y. Seino K. Senyo M. E. Sevior C. P. Shen J.-G. Shiu F. Simon A. Sokolov E. Solovieva M. Starič Z. S. Stottler J. F. Strube T. Sumiyoshi W. Sutcliffe M. Takizawa U. Tamponi K. Tanida F. Tenchini M. Uchida T. Uglov S. Uno P. Urquijo R. Van Tonder G. Varner A. Vinokurova B. Wang C. H. Wang M.-Z. Wang P. Wang M. Watanabe S. Watanuki E. Won S. B. Yang H. Ye J. Yelton Y. Yusa J. Zhang Z. P. Zhang V. Zhilich V. Zhukova Brookhaven National Laboratory Upton New York 11973 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 Department of Physics University of Tokyo Tokyo 113-0033 Japan University of South Carolina Columbia South Carolina 29208 USA Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Russia Novosibirsk State University Novosibirsk 630090 Russia Moscow Institute of Physics and Technology Moscow Region 141700 Russia Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Saudi Arabia Tata Institute of Fundamental Research Mumbai 400005 India King Abdulaziz City for Science and Technology Riyadh 11442 Saudi Arabia Pacific Northwest National Laboratory Richland Washington 99352 USA Indian Institute of Technology Madras Chennai 600036 India II. Physikalisches Institut Georg-August-Universität Göttingen 37073 Göttingen Germany Stefan Meyer Institute for Subatomic Physics Vienna 1090 Austria Indian Institute of Science Education and Research Mohali SAS Nagar 140306 India 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 University of Maribor 2000 Maribor Slovenia University of Hawaii Honolulu Hawaii 96822 USA INFN—Sezione di Napoli 80126 Napoli Italy Università di Napoli Federico II 80055 Napoli Italy Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe Germany Max-Planck-Institut für Physik 80805 München Germany National Central University Chung-li 32054 Taiwan Hanyang University Seoul 133-791 South Korea P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Russia Korea Institute of Science and Technology Information Daejeon 305-806 South Korea Gyeongsa

We report a search for the charmless baryonic decay B0→pp¯π0 with a data sample corresponding to an integrated luminosity of 711 fb−1 containing (772±10)×106 BB¯ pairs. The data were collected by the Belle experiment running on the ϒ(4S) resonance at the KEKB e+e− collider. We measure a branching fraction B(B0→pp¯π0)=(5.0±1.8±0.6)×10−7, where the first uncertainty is statistical and the second is systematic. The signal has a significance of 3.1 standard deviations and constitutes the first evidence for this decay mode. We also search for the intermediate two-body decays B0→Δ+p¯ and B0→Δ¯−p, and set an upper limit on the branching fraction, B(B0→Δ+p¯)+B(B0→Δ¯−p)<1.6×10−6 at 90% confidence level.

关键词： Branching fraction Hadronic decays Rare decays

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Search for B+→K+νν¯ Decays Using an Inclusive Tagging Method at Belle II

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Physical Review Letters 2021年第18期127卷 181802-181802页

作者： F. Abudinén I. Adachi K. Adamczyk P. Ahlburg H. Aihara N. Akopov A. Aloisio N. Anh Ky D. M. Asner H. Atmacan T. Aushev V. Aushev A. Baur V. Babu S. Baehr P. Bambade Sw. Banerjee S. Bansal J. Baudot J. Becker P. K. Behera J. V. Bennett E. Bernieri F. U. Bernlochner M. Bertemes E. Bertholet M. Bessner S. Bettarini F. Bianchi T. Bilka D. Biswas A. Bozek M. Bračko P. Branchini N. Braun T. E. Browder A. Budano S. Bussino M. Campajola L. Cao G. Casarosa C. Cecchi D. Červenkov P. Chang R. Cheaib V. Chekelian C. Chen Y.-T. Chen B. G. Cheon K. Chilikin K. Chirapatpimol K. Cho S.-J. Cho 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 M. De Nuccio 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 K. Dort S. Dubey S. Duell G. Dujany S. Eidelman M. Eliachevitch D. Epifanov T. Ferber D. Ferlewicz T. Fillinger G. Finocchiaro S. Fiore A. Fodor F. Forti A. Frey B. G. Fulsom N. Gabyshev E. Ganiev M. Garcia-Hernandez A. Garmash V. Gaur A. Gaz A. Gellrich R. Giordano A. Giri A. Glazov B. Gobbo R. Godang P. Goldenzweig B. Golob P. Grace W. Gradl E. Graziani D. Greenwald Y. Guan K. Gudkova C. Hadjivasiliou S. Halder K. 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 J. Irakkathil Jabbar A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki P. Jackson W. W. Jacobs D. E. Jaffe Y. Jin C. Joo H. Junkerkalefeld A. B. Kaliyar J. Kandra K. H. Kang R. Karl G. Karyan T. Kawasaki C. Ketter H. Kichimi C. Kiesling C.-H. Kim D. Y. Kim Y.-K. Kim T. D. Kimmel P. Kodyš T. Koga S. Kohani T. Konno A. Korobov S. Korpar E. Kovalenko T. M. G. Kraetzschmar F. Krinner P. Križan P. Krokovny T. Kuhr J. Kumar M. Kumar R. Kumar K. Kumara T. Kunigo S. Kurz A. Kuzmin Y.-J. Kwon S. Lacaprara Y.-T. Lai C. La Licata L. Lanceri J. S 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 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 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 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 University of Cincinnati Cincinnati Ohio 45221 National Research University Higher School of Economics Moscow 101000 Taras Shevchenko National University of Kiev Kiev Deutsches Elektronen–Synchrotron 22607 Hamburg Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe 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 Institute of High Energy Physics Vienna 1050 School of Physics and Astronomy Tel Aviv University Tel Aviv 69978 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 Faculty of Mathematics and Physics Charles University 121 16 Prague Faculty of Chemistry and Chemical Engineering 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

A search for the flavor-changing neutral-current decay B+→K+νν¯ is performed at the Belle II experiment at the SuperKEKB asymmetric energy electron-positron collider. The data sample corresponds to an integrated luminosity of 63 fb−1 collected at the ϒ(4S) resonance and a sample of 9 fb−1 collected at an energy 60 MeV below the resonance. Because the measurable decay signature involves only a single charged kaon, a novel measurement approach is used that exploits not only the properties of the B+→K+νν¯ decay, but also the inclusive properties of the other B meson in the ϒ(4S)→BB¯ event, to suppress the background from other B meson decays and light-quark pair production. This inclusive tagging approach offers a higher signal efficiency compared to previous searches. No significant signal is observed. An upper limit on the branching fraction of B+→K+νν¯ of 4.1×10−5 is set at the 90% confidence level.

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

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