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Measurement of branching fractions and CP asymmetries for Ds+→K+(η,π0) and Ds+→π+(η,π0) decays at Belle

Physical Review D 2021年第11期103卷 112005-112005页

作者： Y. Guan A. J. Schwartz K. Kinoshita I. Adachi H. Aihara S. Al Said D. M. Asner H. Atmacan V. Aulchenko T. Aushev R. Ayad V. Babu 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 K. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe S. Das G. De Nardo R. Dhamija F. Di Capua J. Dingfelder Z. Doležal T. V. Dong 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 K. Gudkova C. Hadjivasiliou S. Halder T. Hara 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 C. W. Joo K. K. Joo J. Kahn A. B. Kaliyar K. H. Kang T. Kawasaki H. Kichimi 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 M. Kumar K. Kumara A. Kuzmin Y.-J. Kwon K. Lalwani J. S. Lange I. S. Lee S. C. Lee P. Lewis L. K. Li Y. B. Li L. Li Gioi J. Libby K. Lieret D. Liventsev C. MacQueen M. Masuda 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 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. V. Purohit M. Röhrken A. Rostomyan N. Rout G. Russo D. Sahoo S. Sandilya A. Sangal L. Santelj T. Sanuki V. Savinov 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 K. Tanida F. Tenchini K. Trabelsi 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 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 Higher School of Economics (HSE) Moscow 101000 Deutsches Elektronen–Synchrotron 22607 Hamburg Indian Institute of Technology Madras Chennai 600036 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 Wayne State University Detroit Michigan 48202 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 Faculty of Chemistry and Chemical Engineering University of Maribor 2000 Maribor INFN—Sezione di Napoli 80126 Napoli Università di Napoli Federico II 80126 Napoli 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 University Suwon 16419 Indian Institute of Technology Hyderabad Telangana 502285 Malaviya National Institute of Technology Jaipur Jaipur 302017 University of Bonn 53115 Bonn Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institu

We report measurements of the branching fractions and CP asymmetries for Ds+→K+η, Ds+→K+π0, and Ds+→π+η decays, and the branching fraction for Ds+→π+π0. Our results are based on a data sample corresponding to an integrated luminosity of 921 fb−1 collected by the Belle detector at the KEKB e+e− asymmetric-energy collider. Our measurements of CP asymmetries in these decays are the most precise to date; no evidence for CP violation is found.

关键词： Branching fraction Heavy mesons CP violation Lepton colliders

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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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Search for the ηc2(1D) in e+e−→γηc2(1D) at s near 10.6 GeV at Belle

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Physical Review D 2021年第1期104卷 012012-012012页

作者： S. Jia C. P. Shen I. Adachi H. Aihara S. Al Said D. M. Asner T. Aushev R. Ayad V. Babu P. Behera K. Belous J. Bennett M. Bessner V. Bhardwaj B. Bhuyan T. Bilka J. Biswal A. Bobrov G. Bonvicini A. Bozek M. Bračko P. Branchini T. E. Browder A. Budano M. Campajola D. Červenkov M.-C. Chang P. 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 G. De Pietro R. Dhamija F. Di Capua Z. Doležal T. V. Dong D. Epifanov T. Ferber B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig E. Graziani T. Gu K. Gudkova C. Hadjivasiliou S. Halder T. Hara O. Hartbrich K. Hayasaka H. Hayashii W.-S. Hou C.-L. Hsu K. Inami A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs Y. Jin K. K. Joo A. B. Kaliyar K. H. Kang G. Karyan Y. Kato T. Kawasaki C. Kiesling D. Y. Kim K.-H. 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 K. Kumara A. Kuzmin Y.-J. Kwon K. Lalwani J. S. Lange M. Laurenza S. C. Lee C. H. Li J. Li L. K. Li Y. B. Li L. Li Gioi J. Libby K. Lieret D. Liventsev M. Masuda T. Matsuda D. Matvienko M. Merola F. Metzner K. Miyabayashi H. Miyata R. Mizuk R. Mussa M. Nakao Z. Natkaniec A. Natochii L. Nayak M. Niiyama N. K. Nisar S. Nishida K. Nishimura S. Ogawa H. Ono P. Oskin P. Pakhlov G. Pakhlova S. Pardi S.-H. Park S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik V. Popov E. Prencipe M. T. Prim A. Rostomyan N. Rout G. Russo D. Sahoo S. Sandilya A. Sangal L. Santelj T. Sanuki V. Savinov G. Schnell C. Schwanda Y. Seino K. Senyo M. E. Sevior M. Shapkin C. Sharma J.-G. Shiu B. Shwartz A. Sokolov E. Solovieva M. Starič Z. S. Stottler M. Sumihama M. Takizawa K. Tanida Y. Tao F. Tenchini K. Trabelsi T. Uglov Y. Unno K. Uno S. Uno P. Urquijo Y. Usov S. E. Vahsen R. Van Tonder G. Varner A. Vinokurova E. Waheed C. H. Wang E. Wang M.-Z. Wang P. Wang S. Watanuki O. Werbycka E. Won X. Xu B. D. Yabsley W. Yan S. B. Y 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 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 National Research University Higher School of Economics Moscow 101000 Deutsches Electronen-Synchrotron 22607 Hamburg 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 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 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 Natio

For the first time we search for the ηc2(1D) in e+e−→γηc2(1D) at s=10.52, 10.58, and 10.867 GeV with data samples of 89.5 fb−1, 711 fb−1, and 121.4 fb−1, respectively, accumulated with the Belle detector at the KEKB asymmetric energy electron-positron collider. No significant ηc2(1D) signal is observed in the mass range between 3.8 and 3.88 GeV/c2. The upper limit at 90% confidence level on the product of the Born cross section for e+e−→γηc2(1D) and branching fraction for ηc2(1D)→γhc(1P) is determined to be σ(e+e−→γηc2(1D))B(ηc2(1D)→γhc(1P))<4.9 fb at s near 10.6 GeV.

关键词： Particle production Quarkonia Lepton colliders

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Measurement of the branching fraction of Λc+→pω decay at Belle

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Physical Review D 2021年第7期104卷 072008-072008页

作者： S. X. Li L. K. Li C. P. Shen I. Adachi H. Aihara S. Al Said D. M. Asner T. Aushev 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 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 Y. Kato 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 R. Kumar K. Kumara Y.-J. Kwon Y.-T. Lai J. S. Lange M. Laurenza S. C. Lee J. Li Y. B. Li L. Li Gioi J. Libby K. Lieret D. Liventsev C. MacQueen M. Masuda T. Matsuda M. Merola K. Miyabayashi R. Mizuk 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 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 Y. Seino K. Senyo M. E. Sevior M. Shapkin C. Sharma J.-G. Shiu F. Simon 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 M. Uchida T. Uglov Y. Unno K. Uno S. Uno P. Urquijo Y. Usov S. E. Vahsen R. Van Tonder G. Varner A. Vinokurova E. Waheed C. H. Wang E. Wang M.-Z. Wang P. Wang E. Won B. D. Yabsley W. Yan S. B. Yang H. Ye J. Yelton J. H. Yin Y. Yusa Z. P. Zhang V. Zhilich V. Zhuk Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics Fudan University Shanghai 200443 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 National Research University Higher School of Economics Moscow 101000 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 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 Technolo

Using 980.6 fb−1 of data collected with the Belle detector operating at the KEKB asymmetric-energy e+e− collider, we present a measurement of the branching fraction of the singly Cabibbo-suppressed decay Λc+→pω. A clear Λc+ signal is observed for Λc+→pω with a statistical significance of 9.1 standard deviations, and we measure the ratio of branching fractions B(Λc+→pω)/B(Λc+→pK−π+)=(1.32±0.12(stat)±0.10(syst))×10−2, from which we infer the branching fraction B(Λc+→pω)=(8.27±0.75(stat)±0.62(syst)±0.42(ref))×10−4. The first quoted uncertainty is statistical, the second systematic, and the third from the reference mode Λc+→pK−π+.

关键词： Branching fraction Charmed baryons Lepton colliders

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Measurements of partial branching fractions of inclusive B→Xuℓ+νℓ decays with hadronic tagging

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Physical Review D 2021年第1期104卷 012008-012008页

作者： L. Cao W. Sutcliffe R. Van Tonder F. U. Bernlochner I. Adachi H. Aihara S. Al Said D. M. Asner H. Atmacan T. Aushev R. Ayad V. Babu M. Bauer P. Behera K. Belous J. Bennett M. Bessner V. Bhardwaj T. Bilka J. Biswal G. Bonvicini A. Bozek M. Bračko T. E. Browder M. Campajola D. Červenkov M.-C. Chang P. 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. Dubey S. Eidelman D. Epifanov T. Ferber D. Ferlewicz A. Frey B. G. Fulsom R. Garg V. Gaur A. Garmash A. Giri P. Goldenzweig Y. Guan C. Hadjivasiliou T. Hara O. Hartbrich K. Hayasaka H. Hayashii M. T. Hedges M. Hernandez Villanueva W.-S. Hou C.-L. Hsu T. Iijima K. Inami A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs E.-J. Jang H. B. Jeon S. Jia Y. Jin C. W. Joo K. K. Joo K. H. Kang G. Karyan T. Kawasaki H. Kichimi C. Kiesling B. H. Kim C. H. Kim D. Y. Kim H. J. Kim K.-H. Kim S. H. Kim Y.-K. Kim K. Kinoshita P. Kodyš T. Konno A. Korobov S. Korpar D. Kotchetkov 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 C. H. Li J. Li L. K. Li Y. B. Li L. Li Gioi J. Libby K. Lieret Z. Liptak D. Liventsev J. MacNaughton C. MacQueen M. Masuda T. Matsuda D. Matvienko M. Merola F. Metzner K. Miyabayashi R. Mizuk G. B. Mohanty T. J. Moon T. Mori 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 C. W. Park 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. Ritter M. Röhrken A. Rostomyan N. Rout M. Rozanska G. Russo D. Sahoo Y. Sakai S. Sandilya A. Sangal L. Santelj T. Sanuki V. Savinov G. Schnell J. Schueler C. Schwanda A. J. Schwartz Y. Seino K. Senyo M. E. Sevior M. Shapkin C. Sharma C. P. Shen J.-G. Shiu F University of Bonn 53115 Bonn 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 Cincinnati Cincinnati Ohio 45221 Higher School of Economics (HSE) Moscow 101000 Deutsches Elektronen–Synchrotron 22607 Hamburg Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe 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 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana Wayne State University Detroit Michigan 48202 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 University of Maribor 2000 Maribor INFN—Sezione di Napoli 80126 Napoli Università di Napoli Federico II 80126 Napoli Department of Physics Fu Jen Catholic University Taipei 24205 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 Yonsei University Seoul 03722 Gyeongsang National University Jinju 52828 Sungkyunkwan University Suwon 16419 Indian Institute of Technology Hyderabad Telangana 502285 Malaviya National Institute of Technology Jaipur Jaipur 302017 Key Laboratory of Nuclear Physics and Ion-bea

We present measurements of partial branching fractions of inclusive semileptonic B→Xuℓ+νℓ decays using the full Belle dataset of 711 fb−1 of integrated luminosity at the ϒ(4S) resonance and for ℓ=e, μ. Inclusive semileptonic B→Xuℓ+νℓ decays are Cabibbo-Kobayashi-Maskawa (CKM) suppressed and measurements are complicated by the large background from CKM favored B→Xcℓ+νℓ transitions, which have a similar signature. Using machine learning techniques, we reduce this and other backgrounds effectively, while retaining access to a large fraction of the B→Xuℓ+νℓ phase space and high signal efficiency. We measure partial branching fractions in three phase-space regions covering about 31% to 86% of the accessible B→Xuℓ+νℓ phase space. The most inclusive measurement corresponds to the phase space with lepton energies of EℓB>1 GeV, and we obtain ΔB(B→Xuℓ+νℓ)=(1.59±0.07±0.16)×10−3 from a two-dimensional fit of the hadronic mass spectrum and the four-momentum-transfer squared distribution, with the uncertainties denoting the statistical and systematic error. We find |Vub|=(4.10±0.09±0.22±0.15)×10−3 from an average of four calculations for the partial decay rate with the third uncertainty denoting the average theory error. This value is higher but compatible with the determination from exclusive semileptonic decays within 1.3 standard deviations. In addition, we report charmless inclusive partial branching fractions separately for B+ and B0 mesons as well as for electron and muon final states. No isospin breaking or lepton flavor universality violating effects are observed.

关键词： Leptonic, semileptonic & radiative decays Quark mixing Bottom quark Particle data analysis Precision measurements

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Measurement of branching fractions of Λc+→ηΛπ+, ηΣ0π+, Λ(1670)π+, and ηΣ(1385)+

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Physical Review D 2021年第5期103卷 052005-052005页

作者： J. Y. Lee K. Tanida Y. Kato S. K. Kim S. B. Yang I. Adachi J. K. Ahn H. Aihara S. Al Said D. M. Asner T. Aushev R. Ayad V. Babu S. Bahinipati P. Behera C. Beleño J. Bennett M. Bessner B. Bhuyan T. Bilka J. Biswal G. Bonvicini A. Bozek M. Bračko T. E. Browder M. Campajola L. Cao D. Červenkov M.-C. Chang P. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin K. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe G. De Nardo F. Di Capua Z. Doležal T. V. Dong S. Eidelman D. Epifanov T. Ferber B. G. Fulsom R. Garg V. Gaur A. Garmash A. Giri P. Goldenzweig B. Golob C. Hadjivasiliou O. Hartbrich K. Hayasaka H. Hayashii M. T. Hedges M. Hernandez Villanueva C.-L. Hsu K. Inami A. Ishikawa R. Itoh M. Iwasaki W. W. Jacobs E.-J. Jang S. Jia Y. Jin C. W. Joo K. K. Joo K. H. Kang G. Karyan H. Kichimi C. Kiesling B. H. Kim D. Y. Kim K.-H. Kim K. T. Kim S. H. Kim Y. J. Kim Y.-K. Kim K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan R. Kroeger P. Krokovny T. Kuhr R. Kulasiri K. Kumara A. Kuzmin Y.-J. Kwon S. C. Lee C. H. Li L. K. Li Y. B. Li L. Li Gioi J. Libby K. Lieret Z. Liptak D. Liventsev T. Luo C. MacQueen M. Masuda T. Matsuda D. Matvienko M. Merola K. Miyabayashi R. Mizuk G. B. Mohanty T. J. Moon T. Mori R. Mussa T. Nakano M. Nakao A. Natochii M. Nayak M. Niiyama N. K. Nisar S. Nishida K. Ogawa S. Ogawa S. L. Olsen H. Ono Y. Onuki P. Oskin P. Pakhlov G. Pakhlova S. Pardi S.-H. Park S. Patra S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik V. Popov E. Prencipe M. T. Prim A. Rostomyan N. Rout G. Russo D. Sahoo Y. Sakai S. Sandilya A. Sangal L. Santelj V. Savinov G. Schnell J. Schueler C. Schwanda A. J. Schwartz R. Seidl Y. Seino K. Senyo M. E. Sevior M. Shapkin V. Shebalin J.-G. Shiu B. Shwartz A. Sokolov E. Solovieva S. Stanič M. Starič Z. S. Stottler M. Sumihama T. Sumiyoshi W. Sutcliffe M. Takizawa U. Tamponi F. Tenchini M. Uchida T. Uglov S. Uno Y. Usov S. E. Vahsen R. Van Tonder G. Varner A. Vinokurova V. Vorobyev A. Vossen C. H. Wang E. Wang M.-Z. Wang P. Wang M. Watanabe S. Watanuki S. Wehle J. Seoul National University Seoul 08826 Advanced Science Research Center Japan Atomic Energy Agency Naka 319-1195 Graduate School of Science Nagoya University Nagoya 464-8602 Korea University Seoul 02841 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 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 II. Physikalisches Institut Georg-August-Universität Göttingen 37073 Göttingen University of Mississippi University Mississippi 38677 University of Hawaii Honolulu Hawaii 96822 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 INFN—Sezione di Napoli 80126 Napoli Università di Napoli Federico II 80126 Napoli University of Bonn 53115 Bonn Department of Physics Fu Jen Catholic University Taipei 24205 Department of Physics 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 Gyeongsang National University Jinju 52828 Sungkyunkwan University Suwon 16419 Indian Institute of Technology Hyderabad Telangana 502285 Key Labor

We report branching fraction measurements of four decay modes of the Λc+ baryon, each of which includes an η meson and a Λ baryon in the final state, and all of which are measured relative to the Λc+→pK−π+ decay mode. The results are based on a 980 fb−1 data sample collected by the Belle detector at the KEKB asymmetric-energy e+e− collider. Two decays, Λc+→ηΣ0π+ and Λ(1670)π+, are observed for the first time, while the measurements of the other decay modes, Λc+→ηΛπ+ and ηΣ(1385)+, are more precise than those made previously. We obtain relative branching fractions of B(Λc+→ηΛπ+)/B(Λc+→pK−π+)=0.293±0.003±0.014, B(Λc+→ηΣ0π+)/B(Λc+→pK−π+)=0.120±0.006±0.010, B(Λc+→Λ(1670)π+)×B(Λ(1670)→ηΛ)/B(Λc+→pK−π+)=(5.54±0.29±0.73)×10−2, and B(Λc+→ηΣ(1385)+)/B(Λc+→pK−π+)=0.192±0.006±0.016. The mass and width of the Λ(1670) are also precisely determined to be 1674.3±0.8±4.9 MeV/c2 and 36.1±2.4±4.8 MeV, respectively, where the uncertainties are statistical and systematic, respectively.

关键词： Branching fraction Hadronic decays Charmed baryons Hyperons Mass Lepton colliders Particle decays Precision measurements

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Measurement of the masses and widths of the Σc(2455)+ and Σc(2520)+ baryons

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Physical Review D 2021年第5期104卷 052003-052003页

作者： J. Yelton I. Adachi J. K. Ahn H. Aihara S. Al Said D. M. Asner H. Atmacan V. Aulchenko T. Aushev R. Ayad V. Babu S. Bahinipati P. Behera K. Belous J. Bennett M. Bessner V. Bhardwaj B. Bhuyan T. Bilka J. Biswal A. Bozek M. Bračko P. Branchini T. E. Browder A. Budano M. Campajola D. Červenkov M.-C. Chang P. 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 G. De Pietro R. Dhamija F. Di Capua J. Dingfelder Z. Doležal T. V. Dong D. Epifanov T. Ferber D. Ferlewicz B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig E. Graziani T. Gu K. Gudkova C. Hadjivasiliou T. Hara O. Hartbrich 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 K. K. Joo A. B. Kaliyar K. H. Kang Y. Kato C. Kiesling C. H. Kim D. Y. Kim K.-H. Kim S. H. Kim Y.-K. Kim K. Kinoshita P. Kodyš T. Konno A. Korobov S. Korpar E. Kovalenko P. Križan R. Kroeger P. Krokovny T. Kuhr R. Kulasiri K. Kumara Y.-J. Kwon 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 D. Matvienko J. T. McNeil M. Merola K. Miyabayashi R. Mizuk G. B. Mohanty T. J. Moon R. Mussa M. Nakao Z. Natkaniec A. Natochii L. Nayak M. Nayak M. Niiyama N. K. Nisar S. Nishida S. Ogawa H. Ono Y. Onuki P. Oskin P. Pakhlov G. Pakhlova S. Pardi H. Park S.-H. Park S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik E. Prencipe M. T. Prim A. Rostomyan N. Rout G. Russo D. Sahoo Y. Sakai S. Sandilya A. Sangal L. Santelj T. Sanuki V. Savinov G. Schnell J. Schueler C. Schwanda Y. Seino K. Senyo M. E. Sevior M. Shapkin C. Sharma C. P. Shen J.-G. Shiu A. Sokolov E. Solovieva M. Starič Z. S. Stottler M. Sumihama K. Sumisawa T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida Y. Tao 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. Vinokurova E. Waheed C. H. Wa University of Florida Gainesville Florida 32611 High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Korea University Seoul 02841 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 Deutsches Electronen-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 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 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 Gyeo

Using 980 fb−1 of data collected with the Belle detector operating at the KEKB asymmetric-energy e+e− collider, we report the measurements of the masses, and the first measurements of the instrinsic widths, of the Σc(2455)+ and Σc(2520)+ charmed baryons. We find M(Σc(2455)+)−M(Λc+)=166.17±0.05−0.07+0.16 MeV/c2, Γ(Σc(2455)+)=2.3±0.3±0.3 MeV/c2, M(Σc(2520)+)−M(Λc+)=230.9±0.5−0.1+0.5 MeV/c2, and Γ(Σc(2520)+)=17.2−2.1−0.7+2.3+3.1 MeV/c2, where the uncertainties are statistical and systematic, respectively. These measurements can be used to test models of the underlying quark structure of the Σc states.

关键词： Particle decays

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Test of Lepton-Flavor Universality in B→K*ℓ+ℓ− Decays at Belle

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Physical Review Letters 2021年第16期126卷 161801-161801页

作者： S. Wehle I. Adachi K. Adamczyk H. Aihara D. M. Asner H. Atmacan V. Aulchenko T. Aushev R. Ayad V. Babu P. Behera M. Berger V. Bhardwaj J. Biswal A. Bozek M. Bračko T. E. Browder M. Campajola L. Cao M.-C. Chang A. Chen B. G. Cheon K. Chilikin K. Cho Y. Choi S. Choudhury D. Cinabro S. Cunliffe N. Dash G. De Nardo F. Di Capua S. Dubey S. Eidelman D. Epifanov T. Ferber B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig D. Greenwald Y. Guan J. Haba O. Hartbrich K. Hayasaka H. Hayashii M. T. Hedges 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 S. Jia Y. Jin D. Joffe J. Kahn A. B. Kaliyar G. Karyan H. Kichimi D. Y. Kim K. T. Kim S. H. Kim Y.-K. Kim K. Kinoshita I. Komarov S. Korpar D. Kotchetkov R. Kroeger P. Krokovny T. Kuhr R. Kulasiri R. Kumar K. Kumara A. Kuzmin Y.-J. Kwon J. S. Lange J. Y. Lee S. C. Lee Y. B. Li J. Libby Z. Liptak D. Liventsev T. Luo J. MacNaughton M. Masuda T. Matsuda J. T. McNeil M. Merola F. Metzner H. Miyata R. Mizuk G. B. Mohanty T. J. Moon R. Mussa M. Nakao A. Natochii M. Nayak C. Niebuhr M. Niiyama N. K. Nisar S. Nishida K. Ogawa S. Ogawa H. Ono Y. Onuki P. Pakhlov G. Pakhlova H. Park S.-H. Park T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik V. Popov E. Prencipe M. T. Prim P. K. Resmi M. Ritter A. Rostomyan N. Rout G. Russo D. Sahoo Y. Sakai S. Sandilya A. Sangal L. Santelj V. Savinov O. Schneider G. Schnell J. Schueler C. Schwanda A. J. Schwartz Y. Seino K. Senyo M. E. Sevior M. Shapkin J.-G. Shiu B. Shwartz E. Solovieva M. Starič J. F. Strube T. Sumiyoshi W. Sutcliffe M. Takizawa U. Tamponi K. Tanida Y. Tao F. Tenchini K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno Y. Ushiroda S. E. Vahsen R. Van Tonder G. Varner K. E. Varvell V. Vorobyev C. H. Wang M.-Z. Wang P. Wang X. L. Wang E. Won X. Xu S. B. Yang H. Ye J. H. Yin C. Z. Yuan Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov Deutsches Elektronen–Synchrotron 22607 Hamburg High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 Department of Physics University of Tokyo Tokyo 113-0033 Brookhaven National Laboratory Upton New York 11973 University of Cincinnati Cincinnati Ohio 45221 Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 Higher School of Economics (HSE) Moscow 101000 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Indian Institute of Technology Madras Chennai 600036 Stefan Meyer Institute for Subatomic Physics Vienna 1090 Indian Institute of Science Education and Research Mohali SAS Nagar 140306 J. Stefan Institute 1000 Ljubljana University of Maribor 2000 Maribor University of Hawaii Honolulu Hawaii 96822 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 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 Pacific Northwest National Laboratory Richland Washington 99352 Panjab University Chandigarh 160014 Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe Department of Physics Technische Universität München 85748 Garching Niigata University Niigata 950-2181 Nara Women’s University Nara 630-8506 Kavli Institute for the Physics and Mathematics of the U

We present a measurement of RK*, the branching fraction ratio B(B→K*μ+μ−)/B(B→K*e+e−), for both charged and neutral B mesons. The ratio for the charged case RK*+ is the first measurement ever performed. In addition, we report absolute branching fractions for the individual modes in bins of the squared dilepton invariant mass q2. The analysis is based on a data sample of 711 fb−1, containing 772×106 BB¯ events, recorded at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. The obtained results are consistent with standard model expectations.

关键词： Branching fraction Flavor changing neutral currents Particle decays Rare decays Bottom mesons Lepton colliders

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Evidence for the decay Ωc0→π+Ω(2012)−→π+(K¯Ξ)−

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Physical Review D 2021年第5期104卷 052005-052005页

作者： Y. Li S. S. Tang S. Jia C. P. Shen I. Adachi H. Aihara S. Al Said D. M. Asner H. Atmacan V. Aulchenko T. Aushev R. Ayad V. Babu S. Bahinipati P. Behera M. Bessner T. Bilka J. Biswal A. Bozek M. Bračko P. Branchini T. E. Browder A. Budano M. Campajola D. Červenkov M.-C. Chang P. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin H. E. Cho K. Cho S.-J. Cho Y. Choi S. Choudhury D. Cinabro S. Cunliffe S. Das N. Dash G. De Nardo G. De Pietro F. Di Capua Z. Doležal T. V. Dong D. Epifanov T. Ferber B. G. Fulsom R. Garg V. Gaur A. Giri P. Goldenzweig B. Golob E. Graziani T. Gu K. Gudkova C. Hadjivasiliou S. Halder K. Hayasaka H. Hayashii W.-S. Hou K. Inami A. Ishikawa M. Iwasaki Y. Iwasaki W. W. Jacobs E.-J. Jang Y. Jin K. K. Joo K. H. Kang G. Karyan C. Kiesling C. H. Kim D. Y. Kim K.-H. Kim S. H. Kim Y.-K. Kim K. Kinoshita P. Kodyš T. Konno A. Korobov S. Korpar E. Kovalenko P. Križan R. Kroeger P. Krokovny T. Kuhr M. Kumar K. Kumara A. Kuzmin Y.-J. Kwon K. Lalwani M. Laurenza S. C. Lee C. H. Li L. K. Li L. Li Gioi J. Libby K. Lieret D. Liventsev M. Masuda T. Matsuda D. Matvienko J. T. McNeil M. Merola K. Miyabayashi R. Mizuk G. B. Mohanty T. Mori R. Mussa M. Nakao Z. Natkaniec A. Natochii L. Nayak M. Nayak M. Niiyama N. K. Nisar S. Nishida K. Nishimura H. Ono Y. Onuki P. Oskin P. Pakhlov G. Pakhlova S. Pardi S.-H. Park A. Passeri S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik V. Popov E. Prencipe M. T. Prim N. Rout G. Russo D. Sahoo Y. Sakai S. Sandilya A. Sangal L. Santelj T. Sanuki V. Savinov G. Schnell C. Schwanda Y. Seino K. Senyo M. Shapkin C. Sharma 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 Y. Unno K. Uno S. Uno Y. Usov S. E. Vahsen R. Van Tonder G. Varner A. Vinokurova E. Waheed C. H. Wang E. Wang M.-Z. Wang P. Wang S. Watanuki O. Werbycka E. Won B. D. Yabsley W. Yan S. B. Yang H. Ye J. Yelton J. H. Yin C. Z. Yuan Y. Yusa Z. P. Zhang V. Zhilich V. Zhukova 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 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 Deutsches Elektronen–Synchrotron 22607 Hamburg Indian Institute of Technology Bhubaneswar Satya Nagar 751007 Indian Institute of Technology Madras Chennai 600036 University of Hawaii Honolulu Hawaii 96822 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana 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 80126 Napoli Università di Napoli Federico II 80126 Napoli Department of Physics Fu Jen Catholic University Taipei 24205 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 Yonsei University Seoul 03722 Sungkyunkwan University Suwon 16419 Indian Institute of Technology Hyderabad Telangana 502285 Wayne State University Detroit Michigan 48202 Malaviya National Institute of Technology Jaipur J

Using a data sample of 980 fb−1 collected with the Belle detector operating at the KEKB asymmetric-energy e+e− collider, we present evidence for the Ω(2012)− in the resonant substructure of Ωc0→π+(K¯Ξ)− ((K¯Ξ)−=K−Ξ0+K¯0Ξ−) decays. The significance of the Ω(2012)− signal is 4.2σ after considering the systematic uncertainties. The ratio of the branching fraction of Ωc0→π+Ω(2012)−→π+(K¯Ξ)− relative to that of Ωc0→π+Ω− is calculated to be 0.220±0.059(stat.)±0.035(syst.). The individual ratios of the branching fractions of the two isospin modes are also determined and found to be B(Ωc0→π+Ω(2012)−)×B(Ω(2012)−→K−Ξ0)/B(Ωc0→π+K−Ξ0)=(9.6±3.2(stat.) ±1.8(syst.))% and B(Ωc0→π+Ω(2012)−)×B(Ω(2012)−→K¯0Ξ−)/B(Ωc0→π+K¯0Ξ−)=(5.5±2.8(stat.) ±0.7(syst.))%.

关键词： Branching fraction Baryons Charmed baryons

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Measurements of q2 moments of inclusive B→Xcℓ+νℓ decays with hadronic tagging

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Physical Review D 2021年第11期104卷 112011-112011页

作者： R. van Tonder L. Cao W. Sutcliffe M. Welsch F. U. Bernlochner I. Adachi H. Aihara D. M. Asner T. Aushev R. Ayad V. Babu 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 A. Budano M. Campajola D. Červenkov M.-C. Chang P. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin H. E. Cho K. Cho S.-J. Cho Y. Choi S. Choudhury D. Cinabro S. Cunliffe S. Das G. De Nardo G. De Pietro R. Dhamija F. Di Capua J. Dingfelder Z. Doležal T. V. Dong S. Dubey D. Epifanov T. Ferber B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Giri P. Goldenzweig 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 W. W. Jacobs S. Jia Y. Jin K. K. Joo A. B. Kaliyar K. H. Kang G. Karyan H. Kichimi C. Kiesling C. H. Kim D. Y. Kim K.-H. Kim Y.-K. Kim K. Kinoshita P. Kodyš T. Konno S. Korpar E. Kovalenko P. Križan R. Kroeger P. Krokovny T. Kuhr M. Kumar R. Kumar K. Kumara A. Kuzmin Y.-J. Kwon J. S. Lange M. Laurenza S. C. Lee P. Lewis C. H. Li 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 S. Mohanty M. Mrvar M. Nakao Z. Natkaniec A. Natochii L. Nayak N. K. Nisar S. Nishida K. Nishimura K. Ogawa S. Ogawa H. Ono P. Oskin P. Pakhlov G. Pakhlova T. Pang S. Pardi 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 A. Rabusov M. Röhrken A. Rostomyan N. Rout G. Russo D. Sahoo L. Santelj V. Savinov G. Schnell C. Schwanda Y. Seino K. Senyo M. E. Sevior M. Shapkin C. Sharma C. P. Shen J.-G. Shiu A. Sokolov E. Solovieva M. Starič Z. S. Stottler J. F. Strube M. Sumihama T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida F. Tenchini K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo S. E. Vahsen G. Varner K. E. Varvell E. Waheed C. H. Wang E. Wang M.-Z. Wang University of Bonn 53115 Bonn High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Department of Physics University of Tokyo Tokyo 113-0033 Brookhaven National Laboratory Upton New York 11973 National Research University Higher School of Economics Moscow 101000 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Deutsches Elektronen–Synchrotron 22607 Hamburg Indian Institute of Technology 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 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 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 Yonsei University Seoul 03722 Sungkyunkwan University Suwon 16419 Indian Institute of Technology Hyderabad Telangana 502285 Wayne State University Detroit Michigan 48202 Malaviya National Institute of Technology Jaipur Jaipur 302017 Key Laboratory of Nuclear Physics and Io

We present the measurement of the first to fourth order moments of the four-momentum transfer squared, q2, of inclusive B→Xcℓ+νℓ decays using the full Belle dataset of 711 fb−1 of integrated luminosity at the ϒ(4S) resonance where ℓ=e, μ. The determination of these moments and their systematic uncertainties open new pathways to determine the absolute value of the Cabibbo-Kobayashi-Maskawa matrix element Vcb using a reduced set of matrix elements of the heavy quark expansion. In order to identify and reconstruct the Xc system, we reconstruct one of the two B-mesons using machine learning techniques in fully hadronic decay modes. The moments are measured with progressively increasing threshold selections on q2 starting with a lower value of 3.0 GeV2 in steps of 0.5 GeV2 up to a value of 10.0 GeV2. The measured moments are further unfolded, correcting for reconstruction and selection effects as well as QED final state radiation. We report the moments separately for electron and muon final states and observe no lepton flavor universality violating effects.

关键词： Leptonic, semileptonic & radiative decays Bottom quark Particle data analysis Precision measurements

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