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Study of electromagnetic decays of orbitally excited Ξc baryons

Physical Review D 2020年第7期102卷 071103(R)-071103(R)页

作者： J. Yelton 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 V. Bhardwaj B. Bhuyan 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 K. Cho S.-J. 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 N. Gabyshev A. Garmash A. Giri P. Goldenzweig C. Hadjivasiliou O. Hartbrich K. Hayasaka H. Hayashii M. T. Hedges M. Hernandez Villanueva 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 C. W. Joo K. K. Joo A. B. Kaliyar K. H. Kang G. Karyan Y. Kato T. Kawasaki H. Kichimi C. Kiesling B. H. Kim D. Y. Kim S. H. Kim Y.-K. Kim K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan R. Kroeger P. Krokovny R. Kulasiri R. Kumar K. Kumara A. Kuzmin Y.-J. Kwon K. Lalwani J. S. Lange S. C. Lee P. Lewis 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 J. T. McNeil M. Merola K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty S. Mohanty T. J. Moon T. Mori M. Mrvar R. Mussa E. Nakano M. Nakao Z. Natkaniec A. Natochii M. Nayak N. K. Nisar S. Nishida K. Ogawa S. Ogawa H. Ono Y. Onuki P. Oskin P. Pakhlov G. Pakhlova S. Pardi H. Park S.-H. Park S. Patra S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik V. Popov E. Prencipe M. T. Prim M. Ritter A. Rostomyan N. Rout G. Russo D. Sahoo Y. Sakai S. Sandilya L. Santelj T. Sanuki V. Savinov G. Schnell J. Schueler C. Schwanda Y. Seino K. Senyo M. E. Sevior M. Shapkin V. Shebalin C. P. Shen J.-G. Shiu B. Shwartz J. B. Singh A. Sokolov E. Solovieva M. Starič Z. S. Stottler J. F. Strube M. Sumihama K. Sumisawa T. Sumiyoshi W. Sutcliffe M. Takizawa U. Tamponi K. Tanida F. Tenchini M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov S. E. Vahsen R. Van Tonde 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 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 Indian Institute of Science Education and Research Mohali SAS Nagar 140306 Indian Institute of Technology Guwahati Assam 781039 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana Wayne State University Detroit Michigan 48202 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 University of Maribor 2000 Maribor University of Hawaii Honolulu Hawaii 96822 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 Key Laboratory of Nuclear Physics and Ion-beam Application (

Using 980 fb−1 of data collected with the Belle detector operating at the KEKB asymmetric-energy e+e− collider, we report a study of the electromagnetic decays of excited charmed baryons Ξc(2790) and Ξc(2815). A clear signal (8.6 standard deviations) is observed for Ξc(2815)0→Ξc0γ, and we measure: B[Ξc(2815)0 → Ξc0γ]B[Ξc(2815)0 → Ξc(2645)+π− → Ξc0π+π−]=0.41±0.05±0.03. We also present evidence (3.8 standard deviations) for the similar decay of the Ξc(2790)0 and measure: B[Ξc(2790)0 → Ξc0γ]B[Ξc(2790)0 → Ξc′+π− → Ξc+γπ−]=0.13±0.03±0.02. The first quoted uncertainties are statistical and the second systematic. We find no hint of the analogous decays of the Ξc(2815)+ and Ξc(2790)+ baryons and set upper limits at the 90% confidence level of: B[Ξc(2815)+ → Ξc+γ]B[Ξc(2815)+ → Ξc(2645)0π+ → Ξc+π−π+]<0.09, and B[Ξc(2790)+ → Ξc+γ]B[Ξc(2790)+ → Ξc′0π+ → Ξc0γπ+]<0.06. Approximate values of the partial widths of the decays are extracted, which can be used to discriminate between models of the underlying quark structure of these excited states.

关键词： Leptonic, semileptonic & radiative decays Particle phenomena

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Search for a Light CP-odd Higgs Boson and Low-Mass Dark Matter at the Belle Experiment

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Physical Review Letters 2019年第1期122卷 011801-011801页

作者： I. S. Seong S. E. Vahsen I. Adachi H. Aihara S. Al Said D. M. Asner V. Aulchenko T. Aushev R. Ayad V. Babu A. M. Bakich V. Bansal P. Behera V. Bhardwaj B. Bhuyan T. Bilka J. Biswal A. Bobrov G. Bonvicini A. Bozek M. Bračko T. E. Browder L. Cao D. Červenkov P. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin K. Cho Y. Choi S. Choudhury D. Cinabro S. Cunliffe N. Dash S. Di Carlo J. Dingfelder T. V. Dong S. Eidelman D. Epifanov J. E. Fast A. Frey B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash M. Gelb A. Giri P. Goldenzweig B. Golob E. Guido J. Haba K. Hayasaka H. Hayashii M. T. Hedges T. Higuchi W.-S. Hou C.-L. Hsu K. Huang T. Iijima K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs H. B. Jeon S. Jia Y. Jin D. Joffe K. K. Joo T. Julius A. B. Kaliyar G. Karyan T. Kawasaki H. Kichimi C. Kiesling D. Y. Kim J. B. Kim K. T. Kim S. H. Kim K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan R. Kroeger P. Krokovny T. Kuhr T. Kumita A. Kuzmin Y.-J. Kwon J. S. Lange I. S. Lee S. C. Lee L. K. Li Y. B. Li L. Li Gioi J. Libby D. Liventsev M. Lubej T. Luo C. MacQueen M. Masuda T. Matsuda M. Merola K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty T. Mori R. Mussa E. Nakano M. Nakao T. Nanut K. J. Nath M. Nayak M. Niiyama N. K. Nisar S. Nishida K. Nishimura S. Ogawa H. Ono W. Ostrowicz P. Pakhlov G. Pakhlova B. Pal H. Park T. K. Pedlar R. Pestotnik L. E. Piilonen 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 C. P. Shen T.-A. Shibata J.-G. Shiu F. Simon E. Solovieva S. Stanič M. Starič M. Sumihama T. Sumiyoshi W. Sutcliffe M. Takizawa K. Tanida F. Tenchini K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno Y. Usov C. Van Hulse R. Van Tonder G. Varner A. Vinokurova A. Vossen B. Wang C. H. Wang P. Wang M. Watanabe S. Watanuki E. Widmann E. Won H. Yamamoto H. Ye J. Yelton C. Z. Yuan Y. Yusa S. Zakharov Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov A. Zupanc University of Hawaii Honolulu Hawaii 96822 High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Department of Physics University of Tokyo Tokyo 113-0033 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Department of Physics Faculty of Science King Abdulaziz University Jeddah 21589 Brookhaven National Laboratory Upton New York 11973 Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 Moscow Institute of Physics and Technology Moscow Region 141700 Tata Institute of Fundamental Research Mumbai 400005 School of Physics University of Sydney New South Wales 2006 Pacific Northwest National Laboratory Richland Washington 99352 Indian Institute of Technology Madras Chennai 600036 Indian Institute of Science Education and Research Mohali SAS Nagar 140306 Indian Institute of Technology Guwahati Assam 781039 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 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 Sungkyunkwan University Suwon 440-746 Indian Institute of Technology Hyderabad Telangana 502285 Deutsches Elektronen–Synchrotron 22607 Hamburg Indian Institute of Technology Bhubaneswar Satya Nagar 751007 LAL University Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay University of Bonn 53115 Bonn II. Physikalisches Institut Georg-August-U

We report on the first Belle search for a light CP-odd Higgs boson, A0, that decays into low mass dark matter, χ, in final states with a single photon and missing energy. We search for events produced via the dipion transition ϒ(2S)→ϒ(1S)π+π−, followed by the on-shell process ϒ(1S)→γA0 with A0→χχ, or by the off-shell process ϒ(1S)→γχχ. Utilizing a data sample of 157.3×106 ϒ(2S) decays, we find no evidence for a signal. We set limits on the branching fractions of such processes in the mass ranges MA0<8.97 GeV/c2 and Mχ<4.44 GeV/c2. We then use the limits on the off-shell process to set competitive limits on WIMP-nucleon scattering in the WIMP mass range below 5 GeV/c2.

关键词： Extensions of Higgs sector Invisible decays Hypothetical scalars Lepton colliders

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First measurements of absolute branching fractions of the Ξc+ baryon at Belle

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Physical Review D 2019年第3期100卷 031101(R)-031101(R)页

作者： Y. B. Li C. P. Shen I. Adachi J. K. Ahn H. Aihara S. Al Said D. M. Asner H. Atmacan T. Aushev R. Ayad V. Babu A. M. Bakich Y. Ban 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 H. E. Cho K. Cho Y. Choi S. Choudhury D. Cinabro S. Cunliffe S. Di Carlo Z. Doležal 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 B. Grube O. Grzymkowska J. Haba T. Hara K. Hayasaka H. Hayashii W.-S. Hou T. Iijima K. Inami G. Inguglia A. Ishikawa M. Iwasaki Y. Iwasaki W. W. Jacobs S. Jia Y. Jin D. Joffe K. K. Joo A. B. Kaliyar G. Karyan Y. Kato T. Kawasaki H. Kichimi C. H. Kim D. Y. Kim H. J. Kim K. T. Kim S. H. Kim K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan R. Kroeger 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 C. H. Li L. K. Li L. Li Gioi J. Libby K. Lieret D. Liventsev P.-C. Lu J. MacNaughton M. Masuda T. Matsuda D. Matvienko M. Merola K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty T. J. Moon R. Mussa M. Nakao K. J. Nath M. Nayak M. Niiyama N. K. Nisar S. Nishida K. Nishimura S. Ogawa H. Ono Y. Onuki P. Pakhlov G. Pakhlova B. Pal S. Pardi H. Park S.-H. Park S. Patra S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen V. Popov E. Prencipe M. Ritter A. Rostomyan G. Russo D. Sahoo Y. Sakai M. Salehi L. Santelj T. Sanuki V. Savinov O. Schneider G. Schnell J. Schueler C. Schwanda A. J. Schwartz Y. Seino K. Senyo M. E. Sevior V. Shebalin J.-G. Shiu B. Shwartz F. Simon A. Sokolov E. Solovieva M. Starič Z. S. Stottler J. F. Strube M. Sumihama T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida F. Tenchini M. Uchida T. Uglov Y. Unno S. Uno Y. Ushiroda S. E. Vahsen R. Van Tonder G. Varner A. Vinokurova B. Wang C. H. Wang M.-Z. Wang P. Wang S. Watanuki E. Won S. B. Yang H. Ye J. Yelton J. H. Yin C. Z. Yuan Y. Yusa Z. P. Zhang V. Zhilich State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 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 University of South Carolina Columbia South Carolina 29208 Moscow Institute of Physics and Technology Moscow Region 141700 Deutsches Elektronen–Synchrotron 22607 Hamburg School of Physics University of Sydney New South Wales 2006 Pacific Northwest National Laboratory Richland Washington 99352 Indian Institute of Technology Madras Chennai 600036 II. Physikalisches Institut Georg-August-Universität Göttingen 37073 Göttingen Stefan Meyer Institute for Subatomic Physics Vienna 1090 Indian Institute of Science Education and Research Mohali SAS Nagar 140306 Indian Institute of Technology Guwahati Assam 781039 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana 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 Kore

We present the first measurements of the absolute branching fractions of Ξc+ decays into Ξ−π+π+ and pK−π+ final states. Our analysis is based on a data set of (772±11)×106 BB¯ pairs collected at the ϒ(4S) resonance with the Belle detector at the KEKB e+e− collider. We measure the absolute branching fraction of B¯0→Λ¯c−Ξc+ with the Ξc+ recoiling against Λ¯c− in B¯0 decays resulting in B(B¯0→Λ¯c−Ξc+)=[1.16±0.42(stat.)±0.15(syst.)]×10−3. We then measure the product branching fractions B(B¯0→Λ¯c−Ξc+)B(Ξc+→Ξ−π+π+) and B(B¯0→Λ¯c−Ξc+)B(Ξc+→pK−π+). Dividing these product branching fractions by B¯0→Λ¯c−Ξc+ yields B(Ξc+→Ξ−π+π+)=[2.86±1.21(stat.)±0.38(syst.)]% and B(Ξc+→pK−π+)=[0.45±0.21(stat.)±0.07(syst.)]%. Our result for B(Ξc+→Ξ−π+π+) can be combined with Ξc+ branching fractions measured relative to Ξc+→Ξ−π+π+ to set the absolute scale for many Ξc+ branching fractions.

关键词： Branching fraction Bottom mesons Charmed baryons

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First determination of the spin and parity of the charmed-strange baryon Ξc(2970)+

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Physical Review D 2021年第11期103卷 L111101-L111101页

作者： T. J. Moon K. Tanida Y. Kato S. K. Kim I. Adachi J. K. Ahn H. Aihara S. Al Said D. M. Asner V. Aulchenko 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 A. Chen B. G. Cheon K. Chilikin K. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe N. Dash G. De Nardo F. Di Capua Z. Doležal T. V. Dong D. Dossett S. Dubey S. Eidelman D. Epifanov T. Ferber B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig B. Golob C. Hadjivasiliou O. Hartbrich K. Hayasaka H. Hayashii M. T. Hedges W.-S. Hou C.-L. Hsu K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs S. Jia Y. Jin K. K. Joo K. H. Kang G. Karyan T. Kawasaki H. Kichimi C. Kiesling B. H. Kim D. Y. Kim K. T. Kim S. H. Kim Y. J. Kim Y.-K. Kim T. D. Kimmel K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan R. Kroeger P. Krokovny T. Kuhr R. Kumar K. Kumara A. Kuzmin Y.-J. Kwon I. S. Lee J. Y. Lee S. C. Lee L. K. Li Y. B. Li L. Li Gioi J. Libby Z. Liptak D. Liventsev T. Luo C. MacQueen M. Masuda T. Matsuda D. Matvienko M. Merola K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty S. Mohanty T. Mori R. Mussa T. Nakano M. Nakao Z. Natkaniec A. Natochii M. Nayak M. Niiyama N. K. Nisar S. Nishida K. Ogawa S. Ogawa H. Ono P. Pakhlov G. Pakhlova S. Pardi H. Park S.-H. Park S. Patra S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik V. Popov E. Prencipe M. T. Prim M. Ritter N. Rout G. Russo D. Sahoo Y. Sakai S. Sandilya A. Sangal L. Santelj V. Savinov G. Schnell J. Schueler C. Schwanda R. Seidl Y. Seino K. Senyo M. E. Sevior M. Shapkin C. P. Shen J.-G. Shiu B. Shwartz E. Solovieva M. Starič Z. S. Stottler M. Sumihama K. Sumisawa T. Sumiyoshi W. Sutcliffe M. Takizawa U. Tamponi F. Tenchini K. Trabelsi M. Uchida S. Uehara T. Uglov Y. Unno S. Uno P. Urquijo S. E. Vahsen R. Van Tonder G. Varner A. Vinokurova V. Vorobyev A. Vossen C. H. Wang E. Wang M.-Z. Wang P. Wang 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 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 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 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 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

We report results from a study of the spin and parity of Ξc(2970)+ using a 980 fb−1 data sample collected by the Belle detector at the KEKB asymmetric-energy e+e− collider. The decay angle distributions in the chain Ξc(2970)+→Ξc(2645)0π+→Ξc+π−π+ are analyzed to determine the spin of this charmed-strange baryon. The angular distributions strongly favor the Ξc(2970)+ spin J=1/2 over 3/2 or 5/2, under an assumption that the lowest partial wave dominates in the decay. We also measure the ratio of Ξc(2970)+ decay branching fractions R=B[Ξc(2970)+→Ξc(2645)0π+]/B[Ξc(2970)+→Ξc′0π+]=1.67±0.29(stat)−0.09+0.15(syst)±0.25(IS), where the last uncertainty is due to possible isospin-symmetry-breaking effects. This R value favors the spin-parity JP=1/2+ with the spin of the light-quark degrees of freedom sl=0. This is the first determination of the spin and parity of a charmed-strange baryon.

关键词： Quark model Strong interaction Baryons Charmed baryons Parity Spin

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Evidence for X(3872)→J/ψπ+π− Produced in Single-Tag Two-Photon Interactions

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Physical Review Letters 2021年第12期126卷 122001-122001页

作者： Y. Teramoto S. Uehara M. Masuda I. Adachi H. Aihara S. Al Said D. M. Asner H. Atmacan T. Aushev R. Ayad V. Babu P. Behera C. Beleño J. Bennett V. Bhardwaj B. Bhuyan 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 K. Cho S.-J. 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 T. Ferber B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig D. Greenwald 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 G. Inguglia A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs E.-J. Jang S. Jia Y. Jin C. W. Joo K. K. Joo J. Kahn A. B. Kaliyar K. H. Kang G. Karyan Y. Kato T. Kawasaki H. Kichimi C. Kiesling B. H. Kim D. Y. Kim S. H. Kim Y.-K. Kim T. D. Kimmel K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan R. Kroeger P. Krokovny T. Kuhr R. Kulasiri R. Kumar 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 Z. Liptak D. Liventsev T. Luo C. MacQueen T. Matsuda D. Matvienko M. Merola K. Miyabayashi H. Miyata G. B. Mohanty S. Mohanty T. J. Moon T. Mori M. Mrvar R. Mussa E. Nakano M. Nakao H. Nakazawa Z. Natkaniec A. Natochii M. Nayak N. K. Nisar S. Nishida K. Ogawa S. Ogawa H. Ono Y. Onuki P. Pakhlov G. Pakhlova S. Pardi H. Park S.-H. Park S. Patra S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik V. Popov E. Prencipe M. T. Prim M. Ritter 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 V. Shebalin J.-G. Shiu J. B. Singh E. Solovieva M. Starič Z. S. Stottler M. Sumihama K. Sumisawa T. Sumiyoshi W. Sutcliffe M. Takizawa U. Tamponi F. Tenchini M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov R. Van Tonder G. Varner A. Vinok Osaka City University Osaka 558-8585 High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Earthquake Research Institute University of Tokyo Tokyo 113-0032 Research Center for Nuclear Physics Osaka University Osaka 567-0047 Department of Physics University of Tokyo Tokyo 113-0033 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Department of Physics Faculty of Science King Abdulaziz University Jeddah 21589 Brookhaven National Laboratory Upton New York 11973 University of Cincinnati Cincinnati Ohio 45221 Higher School of Economics (HSE) Moscow 101000 Deutsches Elektronen–Synchrotron 22607 Hamburg Indian Institute of Technology Madras Chennai 600036 II. Physikalisches Institut Georg-August-Universität Göttingen 37073 Göttingen University of Mississippi University Mississippi 38677 Indian Institute of Science Education and Research Mohali SAS Nagar 140306 Indian Institute of Technology Guwahati Assam 781039 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana Wayne State University Detroit Michigan 48202 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 University of Maribor 2000 Maribor University of Hawaii Honolulu Hawaii 96822 INFN—Sezione di Napoli 80126 Napoli Università di Napoli Federico II 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 Hydera

We report the first evidence for X(3872) production in two-photon interactions by tagging either the electron or the positron in the final state, exploring the highly virtual photon region. The search is performed in e+e−→e+e−J/ψπ+π−, using 825 fb−1 of data collected by the Belle detector operated at the KEKB e+e− collider. We observe three X(3872) candidates, where the expected background is 0.11±0.10 events, with a significance of 3.2σ. We obtain an estimated value for Γ˜γγB(X(3872)→J/ψπ+π−) assuming the Q2 dependence predicted by a cc¯ meson model, where −Q2 is the invariant mass squared of the virtual photon. No X(3915)→J/ψπ+π− candidates are found.

关键词： Particle production

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

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

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

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

关键词： Invisible decays Particle dark matter Supersymmetric models

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

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

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

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

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

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

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

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

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

关键词： Particle decays Particle interactions W & Z bosons

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

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

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

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

关键词： Hybrid mesons Quarkonia Mass Lepton colliders

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

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

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

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

关键词： Fragmentation into hadrons Quantum chromodynamics

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