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Simulation and experimental study of resin flow in fibre fabrics

IOP Conference Series: Materials Science and Engineering 2017年第1期207卷

作者： Fei Yan Shilin Yan Yongjing Li Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics Wuhan University of Technology Hubei 430000 China

Liquid Composite Moulding (LCM) is gradually becoming the most competitive manufacturing technology for producing large composite parts with complex geometry with high quality and low cost. These parts include those for airplanes, wind turbine blades and automobile components. Fibre fabrics in liquid composite moulding can be considered as dual-scale porous media. In different gap scales, an unsaturated flow is produced during the mould filling process. This particular flow behaviour deviates from the traditional Darcy's law, which is used to calculate the filling pressure and will cause errors. According to sink theory, the unsaturated flow characteristics of this dual-scale porous media were studied in this paper, and a FEM solution program was developed. The results showed that the pressure curves against the position which simulated by sink functions were departure from the position of traditional theory. In addition, the simulation results of partially-saturated region were consistent with the experimental data.

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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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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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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 integrated luminosity of the Phase 2 data of the Belle Ⅱ experiment

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Chinese Physics C 2020年第2期44卷 1-12页

作者： F.Abudinén I.Adachi P.Ahlburg H.Aihara N.Akopov A.Aloisio F.Ameli L.Andricek N.Anh Ky D.M.Asner H.Atmacan T.Aushev V.Aushev T.Aziz K.Azmi V.Babu S.Baehr S.Bahinipati A.M.Bakich P.Bambade Sw.Banerjee S.Bansal V.Bansal M.Barrett J.Baudot A.Beaulieu J.Becker P.K.Behera J.V.Bennett E.Bernieri F.U.Bernlochner M.Bertemes M.Bessner S.Bettarini V.Bhardwaj F.Bianchi T.Bilka S.Bilokin D.Biswas G.Bonvicini A.Bozek M.Bračko P.Branchini N.Braun T.E.Browder A.Budano S.Bussino M.Campajola L.Cao G.Casarosa C.Cecchi D.Červenkov M.-C.Chang P.Chang R.Cheaib V.Chekelian Y.Q.Chen Y.-T.Chen B.G.Cheon K.Chilikin H.-E.Cho K.Cho S.Cho S.-K.Choi S.Choudhury D.Cinabro L.Corona L.M.Cremaldi S.Cunliffe T.Czank F.Dattola E.De La Cruz-Burelo G.De Nardo M.De Nuccio G.De Pietro R.de Sangro M.Destefanis S.Dey A.De Yta-Hernandez F.Di Capua S.Di Carlo J.Dingfelder Z.Doležal I.Domínguez Jiménez T.V.Dong K.Dort S.Dubey S.Duell S.Eidelman M.Eliachevitch T.Ferber D.Ferlewicz G.Finocchiaro S.Fiore A.Fodor F.Forti A.Frey B.G.Fulsom M.Gabriel E.Ganiev M.Garcia-Hernandez R.Garg A.Garmash V.Gaur A.Gaz U.Gebauer A.Gellrich J.Gemmler T.Geßler R.Giordano A.Giri B.Gobbo R.Godang P.Goldenzweig B.Golob P.Gomis P.Grace W.Gradl E.Graziani D.Greenwald C.Hadjivasiliou S.Halder K.Hara T.Hara O.Hartbrich K.Hayasaka H.Hayashii C.Hearty M.T.Hedges I.Heredia de la Cruz M.Hernández Villanueva A.Hershenhorn T.Higuchi E.C.Hill H.Hirata M.Hoek S.Hollitt T.Hotta C.-L.Hsu Y.Hu K.Huang T.Iijima K.Inami G.Inguglia J.Irakkathil Jabbar A.Ishikawa R.Itoh M.Iwasaki Y.Iwasaki S.Iwata P.Jackson W.W.Jacobs D.E.Jaffe E.-J.Jang H.B.Jeon S.Jia Y.Jin C.Joo J.Kahn H.Kakuno A.B.Kaliyar G.Karyan Y.Kato T.Kawasaki H.Kichimi C.Kiesling B.H.Kim C.-H.Kim D.Y.Kim S.-H.Kim Y.K.Kim Y.Kim T.D.Kimmel K.Kinoshita C.Kleinwort B.Knysh P.Kodyš T.Koga I.Komarov T.Konno S.Korpar D.Kotchetkov N.Kovalchuk T.M.G.Kraetzschmar P.Križan R.Kroeger J.F.Krohn P.Krokovny W.Kuehn T.Kuhr M.Kumar R.Kumar K.Kumara S.Kurz A.Kuzmin Y.-J.Kwon S.Lacaprara Y.-T.Lai C.La Licata K.Lalwani L.Lanceri J.S.Lange K.Lautenbach I.-S.Le Beihang University Beijing 100191 Brookhaven National Laboratory UptonNew York 11973 Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Centro de Investigacion y de Estudios Avanzados del Instituto Politecnico Nacional Mexico City 07360 Faculty of Mathematics and Physics Charles University12116 Prague Chiba University Chiba 263-8522 Consejo Nacional de Ciencia y Tecnología Mexico City 03940 Deutsches Elektronen–Synchrotron 22607 Hamburg Duke University DurhamNorth Carolina 27708 Earthquake Research Institute University of TokyoTokyo 113-0032 Forschungszentrum Jülich 52425 Jülich Department of Physics Fu Jen Catholic UniversityTaipei 24205 Key Laboratory of Nuclear Physics and Ion-beam Application(MOE)and Institute of Modern Physics Fudan UniversityShanghai 200443 II.Physikalisches Institut Georg-August-Universität Göttingen37073 Göttingen Gifu University Gifu 501-1193 The Graduate University for Advanced Studies(SOKENDAI) Hayama 240-0193 Gyeongsang National University Jinju 52828 Department of Physics and Institute of Natural Sciences Hanyang UniversitySeoul 04763 High Energy Accelerator Research Organization(KEK) Tsukuba 305-0801 J-PARC Branch KEK Theory CenterHigh Energy Accelerator Research Organization(KEK)Tsukuba 305-0801 Indian Institute of Science Education and Research Mohali SAS Nagar140306 Indian Institute of Technology Bhubaneswar Satya Nagar 751007 Indian Institute of Technology Hyderabad Telangana 502285 Indian Institute of Technology Madras Chennai 600036 Indiana University BloomingtonIndiana 47408 Institute for High Energy Physics Protvino 142281 Institute of High Energy Physics Vienna 1050 Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049 Institute of Particle Physics(Canada) VictoriaBritish Columbia V8W 2Y2 Institute of Physics Hanoi Instituto de Fisica Corpuscular Paterna 46980 INFN Laboratori Nazionali di Frascati I-00044 Frascati INFN Sezione di Napoli I-80126 Napoli INFN Sezione di Padova I-35131 Padova INFN Sezione di Perugia I-06123 Perugia

From April to July 2018,a data sample at the peak energy of the T(4 S) resonance was collected with the Belle Ⅱ detector at the SuperKEKB electron-positron *** is the first data sample of the Belle Ⅱ *** Bhabha and digamma events,we measure the integrated luminosity of the data sample to be(496.3±0.3±3.0) pb-1,where the first uncertainty is statistical and the second is *** work provides a basis for future luminosity measurements at Belle Ⅱ.

关键词： luminosity Bhabha digamma Belle II

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Search for the decay Bs0→η′η

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

作者： N. K. Nisar V. Savinov I. Adachi H. Aihara S. Al Said D. M. Asner H. Atmacan T. Aushev R. Ayad V. Babu S. Bahinipati P. Behera J. Bennett M. Bessner V. Bhardwaj B. Bhuyan T. Bilka J. Biswal G. Bonvicini A. Bozek M. Bračko T. E. Browder M. Campajola D. Červenkov M.-C. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin H. E. Cho K. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe S. Das N. Dash G. De Nardo R. Dhamija F. Di Capua Z. Doležal T. V. Dong S. Dubey S. Eidelman D. Epifanov T. Ferber D. Ferlewicz A. Frey B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig Y. Guan K. Gudkova C. Hadjivasiliou S. Halder T. Hara O. Hartbrich K. Hayasaka H. Hayashii M. T. Hedges C.-L. Hsu T. Iijima K. Inami A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs S. Jia Y. Jin C. W. Joo K. K. Joo J. Kahn A. B. Kaliyar K. H. Kang G. Karyan T. Kawasaki H. Kichimi C. Kiesling C. H. Kim D. Y. Kim S. H. Kim Y.-K. Kim K. Kinoshita P. Kodyš T. Konno A. Korobov S. Korpar E. Kovalenko P. Križan R. Kroeger P. Krokovny T. Kuhr M. Kumar R. Kumar K. Kumara A. Kuzmin Y.-J. Kwon K. Lalwani J. S. Lange S. C. Lee Y. B. Li L. Li Gioi J. Libby K. Lieret D. Liventsev C. MacQueen M. Masuda T. Matsuda D. Matvienko M. Merola F. Metzner R. Mizuk G. B. Mohanty S. Mohanty M. Nakao A. Natochii L. Nayak M. Nayak S. Nishida K. Nishimura S. Ogawa H. Ono Y. Onuki P. Oskin P. Pakhlov G. Pakhlova T. Pang S. Pardi H. Park S.-H. Park S. Patra S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik E. Prencipe M. T. Prim M. Röhrken A. Rostomyan N. Rout G. Russo D. Sahoo S. Sandilya A. Sangal L. Santelj T. Sanuki G. Schnell J. Schueler C. Schwanda Y. Seino K. Senyo M. E. Sevior M. Shapkin C. Sharma C. P. Shen J.-G. Shiu B. Shwartz F. Simon E. Solovieva S. Stanič M. Starič Z. S. Stottler M. Sumihama T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida F. Tenchini K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo R. Van Tonder G. Varner A. Vossen E. Waheed C. H. Wang M.-Z. Wang P. Wang X. L. Wang S. Watanuki E. Won X. Xu B. D. Yab Brookhaven National Laboratory Upton New York 11973 USA University of Pittsburgh Pittsburgh Pennsylvania 15260 USA High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 Japan SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Japan Department of Physics University of Tokyo Tokyo 113-0033 Japan Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Saudi Arabia Department of Physics Faculty of Science King Abdulaziz University Jeddah 21589 Saudi Arabia University of Cincinnati Cincinnati Ohio 45221 USA Higher School of Economics (HSE) Moscow 101000 Russia Deutsches Elektronen–Synchrotron 22607 Hamburg Germany Indian Institute of Technology Bhubaneswar Satya Nagar 751007 India Indian Institute of Technology Madras Chennai 600036 India University of Mississippi University Mississippi 38677 USA University of Hawaii Honolulu Hawaii 96822 USA Indian Institute of Science Education and Research Mohali SAS Nagar 140306 India Indian Institute of Technology Guwahati Assam 781039 India Faculty of Mathematics and Physics Charles University 121 16 Prague Czech Republic J. Stefan Institute 1000 Ljubljana Slovenia Wayne State University Detroit Michigan 48202 USA H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 Poland University of Maribor 2000 Maribor Slovenia INFN—Sezione di Napoli 80126 Napoli Italy Università di Napoli Federico II 80126 Napoli Italy Department of Physics Fu Jen Catholic University Taipei 24205 Republic of China Max-Planck-Institut für Physik 80805 München Germany National Central University Chung-li 32054 Taiwan Department of Physics and Institute of Natural Sciences Hanyang University Seoul 04763 South Korea P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Russia Korea Institute of Science and Technology Information Daejeon 34141 South Korea Gyeongsang National University Jinju 52828 South Korea Sungkyunkwan University Suwon 16419 Sout

We report the results of the first search for the decay Bs0→η′η using 121.4 fb−1 of data collected at the ϒ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. We observe no signifi... 详细信息

关键词： Hadronic decays Rare decays

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Measurement of time-dependent CP violation parameters in B0→KS0KS0KS0 decays at Belle

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Physical Review D 2021年第3期103卷 032003-032003页

作者： K. H. Kang H. Park T. Higuchi K. Miyabayashi K. Sumisawa I. Adachi J. K. Ahn H. Aihara S. Al Said D. M. Asner V. Aulchenko T. Aushev R. Ayad V. Babu S. Bahinipati A. M. Bakich P. Behera C. Beleño J. Bennett V. Bhardwaj T. Bilka J. Biswal G. Bonvicini A. Bozek M. Bračko T. E. Browder M. Campajola L. Cao D. Červenkov M.-C. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin K. Cho S.-K. Choi Y. Choi D. Cinabro S. Cunliffe N. Dash G. De Nardo Z. Doležal T. V. Dong S. Eidelman J. E. Fast T. Ferber B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig B. Golob D. Greenwald Y. Guan O. Hartbrich K. Hayasaka H. Hayashii M. Hernandez Villanueva W.-S. Hou C.-L. Hsu K. Inami G. Inguglia A. Ishikawa M. Iwasaki Y. Iwasaki W. W. Jacobs E.-J. Jang H. B. Jeon S. Jia Y. Jin K. K. Joo A. B. Kaliyar G. Karyan T. Kawasaki H. Kichimi C. Kiesling C. H. Kim D. Y. Kim K.-H. 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 A. Kuzmin Y.-J. Kwon J. S. Lange I. S. Lee S. C. Lee J. Li L. K. Li Y. B. Li L. Li Gioi J. Libby K. Lieret D. Liventsev J. MacNaughton C. MacQueen M. Masuda T. Matsuda D. Matvienko M. Merola H. Miyata R. Mizuk G. B. Mohanty T. J. Moon T. Mori T. Morii M. Mrvar R. Mussa M. Nakao H. Nakazawa Z. Natkaniec M. Nayak N. K. Nisar S. Nishida K. Nishimura K. Ogawa S. Ogawa 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 M. V. Purohit 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 V. Shebalin J.-G. Shiu E. Solovieva S. Stanič M. Starič Z. S. Stottler T. Sumiyoshi W. Sutcliffe M. Takizawa U. Tamponi K. Tanida F. Tenchini K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo Y. Ushiroda G. Varner A. Vinokurova V. Vorobyev C. H. Wang E. Wa Kyungpook National University Daegu 41566 Kavli Institute for the Physics and Mathematics of the Universe (WPI) University of Tokyo Kashiwa 277-8583 Nara Women’s University Nara 630-8506 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 School of Physics University of Sydney New South Wales 2006 Indian Institute of Technology Madras Chennai 600036 II. Physikalisches Institut Georg-August-Universität Göttingen 37073 Göttingen University of Mississippi University Mississippi 38677 Indian Institute of Science Education and Research Mohali SAS Nagar 140306 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 University of Bonn 53115 Bonn Department of Physics Fu Jen Catholic University Taipei 24205 Max-Planck-Institut für Physik 80805 München National Central University Chung-li 32054 Department of Physics and Institute of Natural Sciences Hanyang University Seoul 04763 P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Korea Institute of Science and Technology Information Daejeon 34141 Gye

We measure the time-dependent CP violation parameters in B0→KS0KS0KS0 decays using 772×106BB¯ pairs collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. The obtained mixing-induced and direct CP asymmetries are −0.71±0.23 (stat)±0.05 (syst) and 0.12±0.16 (stat)±0.05 (syst), respectively. These values are consistent with the Standard Model predictions. The significance of CP violation differs from zero by 2.5 standard deviations.

关键词： Bottom mesons Quark mixing Lepton colliders Particle decays Particle mixing & oscillations

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

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

作者： F. Abudinén I. Adachi K. Adamczyk P. Ahlburg H. Aihara N. Akopov A. Aloisio N. Anh Ky D. M. Asner H. Atmacan T. Aushev V. Aushev A. Baur V. Babu S. Baehr P. Bambade Sw. Banerjee S. Bansal J. Baudot J. Becker P. K. Behera J. V. Bennett E. Bernieri F. U. Bernlochner M. Bertemes E. Bertholet M. Bessner S. Bettarini F. Bianchi T. Bilka D. Biswas A. Bozek M. Bračko P. Branchini N. Braun T. E. Browder A. Budano S. Bussino M. Campajola L. Cao G. Casarosa C. Cecchi D. Červenkov P. Chang R. Cheaib V. Chekelian C. Chen Y.-T. Chen B. G. Cheon K. Chilikin K. Chirapatpimol K. Cho S.-J. Cho S. Choudhury D. Cinabro L. Corona L. M. Cremaldi S. Cunliffe T. Czank F. Dattola E. De La Cruz-Burelo G. de Marino G. De Nardo M. De Nuccio G. De Pietro R. de Sangro M. Destefanis S. Dey A. De Yta-Hernandez A. Di Canto F. Di Capua J. Dingfelder Z. Doležal I. Domínguez Jiménez T. V. Dong K. Dort S. Dubey S. Duell G. Dujany S. Eidelman M. Eliachevitch D. Epifanov T. Ferber D. Ferlewicz T. Fillinger G. Finocchiaro S. Fiore A. Fodor F. Forti A. Frey B. G. Fulsom N. Gabyshev E. Ganiev M. Garcia-Hernandez A. Garmash V. Gaur A. Gaz A. Gellrich R. Giordano A. Giri A. Glazov B. Gobbo R. Godang P. Goldenzweig B. Golob P. Grace W. Gradl E. Graziani D. Greenwald Y. Guan K. Gudkova C. Hadjivasiliou S. Halder K. Hara O. Hartbrich K. Hayasaka H. Hayashii S. Hazra C. Hearty I. Heredia de la Cruz M. Hernández Villanueva A. Hershenhorn T. Higuchi E. C. Hill H. Hirata M. Hoek M. Hohmann C.-L. Hsu T. Humair T. Iijima K. Inami G. Inguglia J. Irakkathil Jabbar A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki P. Jackson W. W. Jacobs D. E. Jaffe Y. Jin C. Joo H. Junkerkalefeld A. B. Kaliyar J. Kandra K. H. Kang R. Karl G. Karyan T. Kawasaki C. Ketter H. Kichimi C. Kiesling C.-H. Kim D. Y. Kim Y.-K. Kim T. D. Kimmel P. Kodyš T. Koga S. Kohani T. Konno A. Korobov S. Korpar E. Kovalenko T. M. G. Kraetzschmar F. Krinner P. Križan P. Krokovny T. Kuhr J. Kumar M. Kumar R. Kumar K. Kumara T. Kunigo S. Kurz A. Kuzmin Y.-J. Kwon S. Lacaprara Y.-T. Lai C. La Licata L. Lanceri J. S INFN Sezione di Trieste I-34127 Trieste High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 The Graduate University for Advanced Studies (SOKENDAI) Hayama 240-0193 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 University of Bonn 53115 Bonn Department of Physics University of Tokyo Tokyo 113-0033 Alikhanyan National Science Laboratory Yerevan 0036 Dipartimento di Scienze Fisiche Università di Napoli Federico II I-80126 Napoli INFN Sezione di Napoli I-80126 Napoli Institute of Physics Vietnam Academy of Science and Technology (VAST) Hanoi Institute of Theoretical and Applied Research (ITAR) Duy Tan University Hanoi 100000 Brookhaven National Laboratory Upton New York 11973 University of Cincinnati Cincinnati Ohio 45221 National Research University Higher School of Economics Moscow 101000 Taras Shevchenko National University of Kiev Kiev Deutsches Elektronen–Synchrotron 22607 Hamburg Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe Université Paris-Saclay CNRS/IN2P3 IJCLab 91405 Orsay University of Louisville Louisville Kentucky 40292 Panjab University Chandigarh 160014 Université de Strasbourg CNRS IPHC UMR 7178 67037 Strasbourg Indian Institute of Technology Madras Chennai 600036 University of Mississippi University Mississippi 38677 INFN Sezione di Roma Tre I-00146 Roma Institute of High Energy Physics Vienna 1050 School of Physics and Astronomy Tel Aviv University Tel Aviv 69978 University of Hawaii Honolulu Hawaii 96822 Dipartimento di Fisica Università di Pisa I-56127 Pisa INFN Sezione di Pisa I-56127 Pisa Dipartimento di Fisica Università di Torino I-10125 Torino INFN Sezione di Torino I-10125 Torino Faculty of Mathematics and Physics Charles University 121 16 Prague Faculty of Chemistry and Chemical Engineering University of Maribor 2000 Maribor J. Stefan Institute 1000 Ljubljana Dipartimento di Matematica e Fisica Università di Roma Tre I-00146 Roma Dipartimento di Fisica

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

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

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

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

作者： T. V. Dong T. Luo I. Adachi H. Aihara D. M. Asner H. Atmacan V. Aulchenko T. Aushev R. Ayad V. Babu S. Bahinipati P. Behera K. Belous F. Bernlochner M. Bessner B. Bhuyan T. Bilka J. Biswal A. Bobrov A. Bozek M. Bračko P. Branchini T. E. Browder A. Budano M. Campajola D. Červenkov M.-C. Chang P. Chang A. Chen B. G. Cheon K. Chilikin H. E. Cho K. Cho S.-J. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe T. Czank S. Das G. De Nardo G. De Pietro R. Dhamija F. Di Capua J. Dingfelder Z. Doležal S. Dubey D. Epifanov T. Ferber D. Ferlewicz B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash A. Giri P. Goldenzweig E. Graziani T. Gu K. Gudkova T. Hara O. Hartbrich K. Hayasaka M. Hernandez Villanueva W.-S. Hou C.-L. Hsu K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki W. W. Jacobs E.-J. Jang S. Jia Y. Jin K. K. Joo J. Kahn K. H. Kang H. Kichimi C. Kiesling C. H. Kim D. Y. Kim S. H. Kim Y.-K. Kim T. D. Kimmel P. Kodyš T. Konno A. Korobov S. Korpar E. Kovalenko P. Križan R. Kroeger P. Krokovny T. Kuhr R. Kulasiri M. Kumar R. Kumar K. Kumara A. Kuzmin Y.-J. Kwon M. Laurenza S. C. Lee J. Li L. K. Li Y. B. Li L. Li Gioi J. Libby K. Lieret D. Liventsev C. MacQueen M. Masuda T. Matsuda D. Matvienko M. Merola F. Metzner K. Miyabayashi R. Mizuk G. B. Mohanty M. Nakao A. Natochii L. Nayak M. Niiyama N. K. Nisar S. Nishida K. Nishimura S. Ogawa H. Ono Y. Onuki P. Oskin P. Pakhlov G. Pakhlova S. Pardi H. Park S.-H. Park S. Patra S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen T. Podobnik V. Popov E. Prencipe M. T. Prim A. Rostomyan N. Rout G. Russo D. Sahoo S. Sandilya A. Sangal L. Santelj T. Sanuki V. Savinov G. Schnell J. Schueler C. Schwanda Y. Seino K. Senyo M. E. Sevior M. Shapkin C. Sharma J.-G. Shiu F. Simon E. Solovieva M. Starič M. Sumihama K. Sumisawa T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida F. Tenchini K. Trabelsi M. Uchida Y. Unno S. Uno R. Van Tonder G. Varner K. E. Varvell E. Waheed C. H. Wang E. Wang P. Wang M. Watanabe S. Watanuki O. Werbycka E. Won B. D. Yabsley W. Yan S. B. Yang H. Ye J. H. Yin Z. Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics Fudan University Shanghai 200443 China High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 Japan SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Japan Department of Physics University of Tokyo Tokyo 113-0033 Japan Brookhaven National Laboratory Upton New York 11973 USA University of Cincinnati Cincinnati Ohio 45221 USA Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Russia Novosibirsk State University Novosibirsk 630090 Russia National Research University Higher School of Economics Moscow 101000 Russia Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Saudi Arabia Deutsches Elektronen–Synchrotron 22607 Hamburg Germany Indian Institute of Technology Bhubaneswar Satya Nagar 751007 India Indian Institute of Technology Madras Chennai 600036 India Institute for High Energy Physics Protvino 142281 Russia University of Bonn 53115 Bonn Germany University of Hawaii Honolulu Hawaii 96822 USA Indian Institute of Technology Guwahati Assam 781039 India Faculty of Mathematics and Physics Charles University 121 16 Prague Czech Republic J. Stefan Institute 1000 Ljubljana Slovenia H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 Poland Faculty of Chemistry and Chemical Engineering University of Maribor 2000 Maribor Slovenia INFN - Sezione di Roma Tre I-00146 Roma Italy INFN - Sezione di Napoli I-80126 Napoli Italy Università di Napoli Federico II I-80126 Napoli Italy Department of Physics Fu Jen Catholic University Taipei 24205 Taiwan Department of Physics National Taiwan University Taipei 10617 Taiwan National Central University Chung-li 32054 Taiwan Department of Physics and Institute of Natural Sciences Hanyang University Seoul 04763 South Korea P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Russia Korea Institute of Science and Technology

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

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

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