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Search for the lepton-flavor-violating decay B0→K*0μ±e∓

Physical Review D 2018年第7期98卷 071101(R)-071101(R)页

作者： S. Sandilya K. Trabelsi A. J. Schwartz I. Adachi H. Aihara S. Al Said D. M. Asner H. Atmacan V. Aulchenko T. Aushev R. Ayad V. Babu I. Badhrees S. Bahinipati A. M. Bakich V. Bansal P. Behera C. Beleño V. Bhardwaj B. Bhuyan T. Bilka J. Biswal A. Bobrov A. Bozek M. Bračko T. E. Browder L. Cao D. Červenkov P. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin K. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe N. Dash S. Di Carlo 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 D. Greenwald Y. Guan J. Haba T. Hara K. Hayasaka H. Hayashii S. Hirose W.-S. Hou C.-L. Hsu 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 A. B. Kaliyar K. H. Kang 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 R. Kulasiri R. Kumar A. Kuzmin Y.-J. Kwon J. S. Lange I. S. Lee S. C. Lee L. K. Li Y. B. Li L. Li Gioi J. Libby D. Liventsev M. Lubej M. Masuda T. Matsuda D. Matvienko M. Merola K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty H. K. Moon T. Mori R. Mussa E. Nakano M. Nakao T. Nanut K. J. Nath Z. Natkaniec M. Nayak M. Niiyama N. K. Nisar S. Nishida K. Ogawa S. Ogawa H. Ono P. Pakhlov G. Pakhlova B. Pal S. Pardi S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen V. Popov K. Prasanth E. Prencipe M. V. Purohit A. Rabusov P. K. Resmi A. Rostomyan G. Russo D. Sahoo Y. Sakai M. Salehi L. Santelj T. Sanuki V. Savinov O. Schneider G. Schnell C. Schwanda Y. Seino K. Senyo O. Seon M. E. Sevior C. P. Shen T.-A. Shibata J.-G. Shiu B. Shwartz J. B. Singh A. Sokolov E. Solovieva M. Starič J. F. Strube M. Sumihama K. Sumisawa T. Sumiyoshi W. Sutcliffe M. Takizawa U. Tamponi K. Tanida F. Tenchini M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo Y. Ushiroda Y. Usov C. Van Hulse R. Van Tonder G. Varner A. V University of Cincinnati Cincinnati 45221 Ohio High Energy Accelerator Research Organization (KEK) 305-0801 Tsukuba SOKENDAI (The Graduate University for Advanced Studies) 240-0193 Hayama Department of Physics University of Tokyo 113-0033 Tokyo Department of Physics Faculty of Science University of Tabuk 71451 Tabuk Department of Physics Faculty of Science King Abdulaziz University 21589 Jeddah Brookhaven National Laboratory Upton 11973 New York University of South Carolina Columbia 29208 South Carolina Budker Institute of Nuclear Physics SB RAS 630090 Novosibirsk Novosibirsk State University 630090 Novosibirsk Moscow Institute of Physics and Technology 141700 Moscow Region Tata Institute of Fundamental Research 400005 Mumbai King Abdulaziz City for Science and Technology 11442 Riyadh Indian Institute of Technology Bhubaneswar 751007 Satya Nagar School of Physics University of Sydney 2006 New South Wales Pacific Northwest National Laboratory Richland 99352 Washington Indian Institute of Technology Madras 600036 Chennai II. Physikalisches Institut Georg-August-Universität Göttingen 37073 Göttingen Indian Institute of Science Education and Research Mohali 140306 SAS Nagar Indian Institute of Technology Guwahati 781039 Assam Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana H. Niewodniczanski Institute of Nuclear Physics 31-342 Krakow University of Maribor 2000 Maribor University of Hawaii Honolulu 96822 Hawaii Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe Department of Physics National Taiwan University 10617 Taipei Max-Planck-Institut für Physik 80805 München National Central University 32054 Chung-li Hanyang University 133-791 Seoul P.N. Lebedev Physical Institute of the Russian Academy of Sciences 119991 Moscow Korea Institute of Science and Technology Information 305-806 Daejeon Gyeongsang National University 660-701 Chinju Sungkyunkwan University 440-746 Suwon I

We have searched for the lepton-flavor-violating decay B0→K*0μ±e∓ using a data sample of 711 fb−1 that contains 772×106 BB¯ pairs. The data were collected near the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. No signals were observed, and we set 90% confidence level upper limits on the branching fractions of B(B0→K*0μ+e−)<1.2×10−7, B(B0→K*0μ−e+)<1.6×10−7, and, for both decays combined, B(B0→K*0μ±e∓)<1.8×10−7. These are the most stringent limits on these decays to date.

关键词： Flavor changing neutral currents Rare decays Flavor symmetries

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Search for the rare decay of B+→ℓ+νℓγ with improved hadronic tagging

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Physical Review D 2018年第11期98卷 112016-112016页

作者： M. Gelb F. U. Bernlochner P. Goldenzweig F. Metzner I. Adachi H. Aihara S. Al Said D. M. Asner H. Atmacan T. Aushev R. Ayad V. Babu I. Badhrees V. Bansal P. Behera C. Beleño B. Bhuyan J. Biswal A. Bobrov M. Bračko N. Braun L. Cao D. Červenkov V. Chekelian A. Chen B. G. Cheon K. Chilikin K. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe N. Dash S. Di Carlo Z. Doležal T. V. Dong S. Eidelman D. Epifanov J. E. Fast T. Ferber A. Frey B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash J. Gemmler A. Giri D. Greenwald J. Haba T. Hara K. Hayasaka H. Hayashii W.-S. Hou K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs S. Jia Y. Jin D. Joffe K. K. Joo J. Kahn A. B. Kaliyar T. Kawasaki H. Kichimi C. Kiesling D. Y. Kim H. J. Kim S. H. Kim P. Kodyš S. Korpar D. Kotchetkov P. Križan R. Kroeger P. Krokovny T. Kuhr R. Kulasiri A. Kuzmin Y.-J. Kwon J. S. Lange I. S. Lee J. K. Lee J. Y. Lee S. C. Lee Y. B. Li L. Li Gioi J. Libby D. Liventsev P.-C. Lu M. Lubej T. Luo J. MacNaughton M. Masuda M. Merola K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty T. Mori M. Mrvar R. Mussa M. Nakao K. J. Nath Z. Natkaniec M. Nayak M. Niiyama N. K. Nisar S. Nishida S. Ogawa P. Pakhlov G. Pakhlova B. Pal S. Pardi S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen V. Popov E. Prencipe M. Prim M. Ritter A. Rostomyan G. Russo D. Sahoo 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 B. Shwartz F. Simon E. Solovieva S. Stanič M. Starič J. F. Strube M. Sumihama T. Sumiyoshi W. Sutcliffe M. Takizawa K. Tanida Y. Tao F. Tenchini M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo R. Van Tonder G. Varner K. E. Varvell B. Wang C. H. Wang M.-Z. Wang P. Wang X. L. Wang M. Watanabe S. Watanuki E. Widmann E. Won H. Yamamoto S. B. Yang H. Ye J. H. Yin C. Z. Yuan Y. Yusa S. Zakharov Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Department of Physics University of Tokyo Tokyo 113-0033 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Department of Physics Faculty of Science King Abdulaziz University Jeddah 21589 Brookhaven National Laboratory Upton New York 11973 University of South Carolina Columbia South Carolina 29208 Moscow Institute of Physics and Technology Moscow Region 141700 Tata Institute of Fundamental Research Mumbai 400005 King Abdulaziz City for Science and Technology Riyadh 11442 Pacific Northwest National Laboratory Richland Washington 99352 Indian Institute of Technology Madras Chennai 600036 II. Physikalisches Institut Georg-August-Universität Göttingen 37073 Göttingen Indian Institute of Technology Guwahati Assam 781039 J. Stefan Institute 1000 Ljubljana Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 University of Maribor 2000 Maribor Faculty of Mathematics and Physics Charles University 121 16 Prague Max-Planck-Institut für Physik 80805 München National Central University Chung-li 32054 Hanyang University Seoul 133-791 P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Korea Institute of Science and Technology Information Daejeon 305-806 Gyeongsang National University Chinju 660-701 Sungkyunkwan University Suwon 440-746 Indian Institute of Technology Hyderabad Telangana 502285 Wayne State University Detroit Michigan 48202 Deutsches Elektronen–Synchrotron 22607 Hamburg Indian Institute of Technology Bhubaneswar Satya Nagar 751007 LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay Panjab University Chandigarh 160014 Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 Department of Physics

We present the result of the search for the rare B meson decay of B+→ℓ+νℓγ with ℓ=e,μ. For the search the full data set recorded by the Belle experiment of 711 fb−1 integrated luminosity near the ϒ(4S) resonance is used. Signal candidates are reconstructed for photon energies Eγ larger than 1 GeV using a novel multivariate tagging algorithm. The novel algorithm fully reconstructs the second B meson produced in the collision using hadronic modes and was specifically trained to recognize the signal signature in combination with hadronic tag-side B meson decays. This approach greatly enhances the performance. Background processes that can mimic this signature, mainly charmless semileptonic decays and continuum processes, are suppressed using multivariate methods. The number of signal candidates is determined by analyzing the missing mass squared distribution as inferred from the signal side particles and the kinematic properties of the tag-side B meson. No significant excess over the background-only hypothesis is observed and upper limits on the partial branching fraction ΔB with Eγ>1 GeV individually for electron and muon final states as well as for the average branching fraction of both lepton final states are reported. We find a Bayesian upper limit of ΔB(B+→ℓ+νℓγ)<3.0×10−6 at 90% CL and also report an upper limit on the first inverse moment of the light-cone distribution amplitude of the B meson of λB>0.24 GeV at 90% CL.

关键词： Branching fraction Leptonic, semileptonic & radiative decays Rare decays

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

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

作者： S. Jia X. L. Wang C. P. Shen C. Z. Yuan I. Adachi H. Aihara S. Al Said D. M. Asner H. Atmacan V. Aulchenko T. Aushev R. Ayad V. Babu V. Bansal P. Behera C. Beleño M. Berger B. Bhuyan T. Bilka J. Biswal A. Bobrov A. Bozek M. Bračko T. E. Browder L. Cao D. Červenkov P. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin K. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe N. Dash S. Di Carlo Z. Doležal T. V. Dong S. Eidelman D. Epifanov J. E. Fast T. Ferber A. Frey B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash M. Gelb A. Giri P. Goldenzweig D. Greenwald J. Haba K. Hayasaka H. Hayashii W.-S. Hou C.-L. Hsu T. Iijima K. Inami G. Inguglia A. Ishikawa R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs Y. Jin D. Joffe J. Kahn A. B. Kaliyar G. Karyan T. Kawasaki H. Kichimi C. Kiesling D. Y. Kim H. J. Kim J. B. Kim S. H. Kim K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan R. Kroeger P. Krokovny T. Kuhr R. Kulasiri R. Kumar A. Kuzmin Y.-J. Kwon K. Lalwani J. S. Lange I. S. Lee J. Y. Lee S. C. Lee C. H. Li L. K. Li Y. B. Li L. Li Gioi J. Libby Z. Liptak D. Liventsev P.-C. Lu M. Lubej J. MacNaughton M. Masuda T. Matsuda D. Matvienko M. Merola H. Miyata R. Mizuk T. Mori R. Mussa E. Nakano M. Nakao K. J. Nath M. Nayak N. K. Nisar S. Nishida S. Ogawa S. L. Olsen H. Ono Y. Onuki W. Ostrowicz G. Pakhlova B. Pal S. Pardi S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen V. Popov E. Prencipe M. Ritter A. Rostomyan G. Russo Y. Sakai M. Salehi S. Sandilya L. Santelj T. Sanuki V. Savinov O. Schneider G. Schnell J. Schueler C. Schwanda Y. Seino K. Senyo M. E. Sevior T.-A. Shibata J.-G. Shiu F. Simon A. Sokolov E. Solovieva M. Starič Z. S. Stottler J. F. Strube T. Sumiyoshi W. Sutcliffe M. Takizawa K. Tanida Y. Tao F. Tenchini M. Uchida S. Uehara T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov R. Van Tonder G. Varner K. E. Varvell V. Vorobyev E. Waheed B. Wang C. H. Wang M.-Z. Wang P. Wang S. Watanuki E. Widmann E. Won H. Yamamoto S. B. Yang H. Ye J. H. Yin Y. Yusa Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov Beihang University Beijing 100191 Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) and Institute of Modern Physics Fudan University Shanghai 200443 Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Department of Physics University of Tokyo Tokyo 113-0033 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Department of Physics Faculty of Science King Abdulaziz University Jeddah 21589 Brookhaven National Laboratory Upton New York 11973 University of South Carolina Columbia South Carolina 29208 Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 Moscow Institute of Physics and Technology Moscow Region 141700 Tata Institute of Fundamental Research Mumbai 400005 Pacific Northwest National Laboratory Richland Washington 99352 Indian Institute of Technology Madras Chennai 600036 II. Physikalisches Institut Georg-August-Universität Göttingen 37073 Göttingen Stefan Meyer Institute for Subatomic Physics Vienna 1090 Indian Institute of Technology Guwahati Assam 781039 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 University of Maribor 2000 Maribor University of Hawaii Honolulu Hawaii 96822 Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe Department of Physics National Taiwan University Taipei 10617 Max-Planck-Institut für Physik 80805 München National Central University Chung-li 32054 Hanyang University Seoul 133-791 P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Korea Institute of Science and Technology Information Daejeon 305-806 Gyeongsang National University Chinju 660-701 Sungkyunkwan University Suwon 440-746 Indian In

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

关键词： Nonrelativistic QCD Perturbative QCD Quantum chromodynamics

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Measurement of time-dependent CP asymmetries in B0→KS0ηγ decays

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Physical Review D 2018年第9期97卷 092003-092003页

作者： H. Nakano A. Ishikawa K. Sumisawa H. Yamamoto I. Adachi H. Aihara S. Al Said D. M. Asner V. Aulchenko T. Aushev R. Ayad V. Babu I. Badhrees V. Bansal P. Behera C. Beleño B. Bhuyan T. Bilka J. Biswal A. Bozek M. Bračko D. Červenkov V. Chekelian B. G. Cheon K. Chilikin K. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe N. Dash S. Di Carlo Z. Doležal S. Eidelman J. E. Fast T. Ferber B. G. Fulsom R. Garg V. Gaur N. Gabyshev A. Garmash M. Gelb A. Giri P. Goldenzweig Y. Guan E. Guido J. Haba T. Hara K. Hayasaka H. Hayashii M. T. Hedges S. Hirose W.-S. Hou T. Iijima K. Inami G. Inguglia R. Itoh M. Iwasaki Y. Iwasaki W. W. Jacobs I. Jaegle H. B. Jeon S. Jia Y. Jin T. Julius A. B. Kaliyar G. Karyan 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 T. Kumita Y.-J. Kwon J. S. Lange I. S. Lee S. C. Lee L. K. Li Y. Li Y. B. Li L. Li Gioi J. Libby D. Liventsev M. Lubej T. Luo J. MacNaughton M. Masuda T. Matsuda M. Merola K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty H. K. Moon R. Mussa E. Nakano M. Nakao T. Nanut K. J. Nath Z. Natkaniec M. Nayak M. Niiyama 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 M. Ritter A. Rostomyan G. Russo D. Sahoo Y. Sakai M. Salehi S. Sandilya L. Santelj T. Sanuki V. Savinov O. Schneider G. Schnell C. Schwanda A. J. Schwartz Y. Seino K. Senyo M. E. Sevior V. Shebalin C. P. Shen T.-A. Shibata N. Shimizu J.-G. Shiu B. Shwartz F. Simon A. Sokolov E. Solovieva S. Stanič M. Starič J. F. Strube M. Sumihama T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida F. Tenchini K. Trabelsi M. Uchida T. Uglov S. Uno P. Urquijo Y. Usov C. Van Hulse G. Varner V. Vorobyev A. Vossen B. Wang C. H. Wang M.-Z. Wang P. Wang X. L. Wang M. Watanabe E. Widmann E. Won H. Ye C. Z. Yuan Y. Yusa S. Zakharov Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov A. Zupanc Department of Physics Tohoku University Sendai 980-8578 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 King Abdulaziz City for Science and Technology Riyadh 11442 Pacific Northwest National Laboratory Richland Washington 99352 Indian Institute of Technology Madras Chennai 600036 II. Physikalisches Institut Georg-August-Universität Göttingen 37073 Göttingen Indian Institute of Technology Guwahati Assam 781039 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 University of Maribor 2000 Maribor Max-Planck-Institut für Physik 80805 München Hanyang University Seoul 133-791 P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Korea Institute of Science and Technology Information Daejeon 305-806 Gyeongsang National University Chinju 660-701 Sungkyunkwan University Suwon 440-746 Indian Institute of Technology Hyderabad Telangana 502285 Wayne State University Detroit Michigan 48202 Deutsches Elektronen–Synchrotron 22607 Hamburg Indian Institute of Technology Bhubaneswar Satya Nagar 751007 LAL Univ. Paris-Sud CNRS/IN2P3 Université Paris-Saclay Orsay Panjab University Chandigarh 160014 Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe Indiana

We report a measurement of time-dependent CP violation parameters in B0→KS0ηγ decays. The study is based on a data sample, containing 772×106BB¯ pairs, that was collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. We obtain the CP violation parameters of S=−1.32±0.77(stat)±0.36(syst) and A=−0.48±0.41(stat)±0.07(syst) for the invariant mass of the KS0η system up to 2.1 GeV/c2.

关键词： Flavor changing neutral currents Bottom quark CP violation Lepton colliders

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Observation of e+e−→π+π−π0χb1,2(1P) and search for e+e−→ϕχb1,2(1P) at s=10.96—11.05 GeV

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Physical Review D 2018年第9期98卷 091102(R)-091102(R)页

作者： J. H. Yin C. Z. Yuan I. Adachi H. Aihara S. Al Said D. M. Asner V. Aulchenko T. Aushev R. Ayad V. Babu I. Badhrees S. Bahinipati A. M. Bakich V. Bansal P. Behera C. Beleño B. Bhuyan T. Bilka J. Biswal A. Bobrov A. Bozek M. Bračko T. E. Browder L. Cao D. Červenkov P. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin K. Cho S.-K. Choi Y. Choi S. Choudhury D. Cinabro S. Cunliffe N. Dash S. Di Carlo 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 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 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 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 E. Nakano M. Nakao T. Nanut K. J. Nath Z. Natkaniec M. Nayak M. Niiyama N. K. Nisar S. Nishida K. Nishimura K. Ogawa S. Ogawa 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. Rostomyan G. Russo D. Sahoo Y. Sakai M. Salehi S. Sandilya L. Santelj T. Sanuki V. Savinov O. Schneider G. Schnell C. Schwanda Y. Seino K. Senyo O. Seon M. E. Sevior C. P. Shen T.-A. Shibata J.-G. Shiu B. Shwartz F. Simon A. Sokolov E. Solovieva M. Starič T. Sumiyoshi W. Sutcliffe M. Takizawa U. Tamponi K. Tanida F. Tenchini M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo C. Van Hulse R. Van Tonder G. Varner A. Vinokurova V. Vorobyev B. Wang C. H. Wang M.-Z. Wang P. Wang X. L. Wang S. Watanuki E. Widmann E. Won H. Yamamoto H. Ye Y. Yusa Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Department of Physics University of Tokyo Tokyo 113-0033 Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Department of Physics Faculty of Science King Abdulaziz University Jeddah 21589 Brookhaven National Laboratory Upton New York 11973 Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 Moscow Institute of Physics and Technology Moscow Region 141700 Tata Institute of Fundamental Research Mumbai 400005 King Abdulaziz City for Science and Technology Riyadh 11442 Indian Institute of Technology Bhubaneswar Satya Nagar 751007 School of Physics University of Sydney New South Wales 2006 Pacific Northwest National Laboratory Richland Washington 99352 Indian Institute of Technology Madras Chennai 600036 II. Physikalisches Institut Georg-August-Universität Göttingen 37073 Göttingen Indian Institute of Technology Guwahati Assam 781039 Faculty of Mathematics and Physics Charles University 121 16 Prague J. Stefan Institute 1000 Ljubljana H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 University of Maribor 2000 Maribor University of Hawaii Honolulu Hawaii 96822 Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie 76131 Karlsruhe Department of Physics National Taiwan University Taipei 10617 Max-Planck-Institut für Physik 80805 München National Central University Chung-li 32054 Hanyang University Seoul 133-791 P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Korea Institute of Science and Technology Information Daejeon 305-806 Gyeongsang National University Chinju 660-701 Sungkyunkwan University Suwon 440-746 Indian Institute of Technology Hyderabad Telangana 502285 Wayne State University Detroit Michigan 48202 De

We report searches for the processes e+e−→π+π−π0χbJ and e+e−→ϕχbJ (J=1, 2) based on data samples collected by the Belle experiment at the KEKB collider. We report the first observation of the process e+e−→(π+π−π0)non−ωχb1 and first evidence for e+e−→ωχbJ in the vicinity of the ϒ(11020) resonance, with center-of-mass energies from 10.96 to 11.05 GeV. The significances for (π+π−π0)non−ωχb1 and ωχbJ are greater than 5.3σ and 4.0σ, respectively. We also investigate the energy dependence of the e+e−→π+π−π0χbJ cross section, but we cannot determine whether the contributions are from the ϒ(10860) and ϒ(11020) resonances or nonresonant continuum processes. The signals for e+e−→ϕχbJ are not significant, and the upper limits of the Born cross sections at the 90% confidence level are 0.7 and 1.0 pb for e+e−→ϕχb1 and ϕχb2, respectively, for center-of-mass energies from 10.96 to 11.05 GeV.

关键词： Branching fraction Hadronic decays Bottom quark Quark model

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Measurement of the branching fraction of B → D(∗)π`ν at Belle using hadronic tagging in fully reconstructed events

arXiv

引用

arXiv 2018年

作者： Vossen, A. Adachi, I. Adamczyk, K. Aihara, H. Al Said, S. Asner, D.M. Aulchenko, V. Aushev, T. Ayad, R. Badhrees, I. Bansal, V. Beleño, C. Bhuyan, B. Bilka, T. Biswal, J. Bondar, A. Bozek, A. Browder, T.E. Červenkov, D. Chen, A. Cheon, B.G. Chilikin, K. Cho, K. Choi, S.-K. Choi, Y. Choudhury, S. Cinabro, D. Cunliffe, S. Dash, N. Di Carlo, S. Doležal, Z. Eidelman, S. Fast, J.E. Ferber, T. Fulsom, B.G. Garg, R. Gaur, V. Gabyshev, N. Garmash, A. Gelb, M. Goldenzweig, P. Guido, E. Hara, T. Hartbrich, O. Hayasaka, K. Hayashii, H. Hedges, M.T. Hirose, S. Hou, W.-S. Inami, K. Ishikawa, A. Itoh, R. Iwasaki, M. Iwasaki, Y. Jacobs, W.W. Jaegle, I. Jia, S. Jin, Y. Julius, T. Kim, D.Y. Kim, H.J. Kim, J.B. Kim, K.T. Kim, S.H. Kinoshita, K. Korpar, S. Kotchetkov, D. Križan, P. Kroeger, R. Krokovny, P. Kuhr, T. Kulasiri, R. Kumita, T. Kwon, Y.-J. Lange, J.S. Lee, I.S. Lee, S.C. Li, L.K. Li, Y. Li Gioi, L. Libby, J. Liventsev, D. Lubej, M. Masuda, M. Merola, M. Miyabayashi, K. Miyata, H. Mizuk, R. Moon, H.K. Mussa, R. Nakano, E. Nakao, M. Nanut, T. Nath, K.J. Nayak, M. Niiyama, M. Nishida, S. Ono, H. Pakhlov, P. Pakhlova, G. Pal, B. Pardi, S. Park, H. Paul, S. Pedlar, T.K. Pestotnik, R. Piilonen, L.E. Popov, V. Ritter, M. Rostomyan, A. Russo, G. Sahoo, D. Sakai, Y. Salehi, M. Sandilya, S. Santelj, L. Sanuki, T. Savinov, V. Schneider, O. Schnell, G. Schwanda, C. Schwartz, A.J. Seino, Y. Senyo, K. Shebalin, V. Shen, C.P. Shibata, T.-A. Shimizu, N. Shiu, J.-G. Simon, F. Solovieva, E. Starič, M. Strube, J.F. Sumihama, M. Sumiyoshi, T. Takizawa, M. Tamponi, U. Tanida, K. Tenchini, F. Trabelsi, K. Uchida, M. Uglov, T. Unno, Y. Uno, S. Urquijo, P. Usov, Y. van Hulse, C. Varner, G. Varvell, K.E. Vinokurova, A. Vorobyev, V. Wang, B. Wang, C.H. Wang, M.-Z. Wang, P. Watanabe, M. Widmann, E. Won, E. Ye, H. Yusa, Y. Zakharov, S. Zhang, Z.P. Zhilich, V. Zhukova, V. Zhulanov, V. Zupanc, A. University of the Basque Country UPV EHU Bilbao48080 Spain Beihang University Beijing100191 China Brookhaven National Laboratory UptonNY11973 United States Budker Institute of Nuclear Physics SB RAS Novosibirsk630090 Russia Faculty of Mathematics and Physics Charles University Prague121 16 Czech Republic University of Cincinnati CincinnatiOH45221 United States Deutsches Elektronen-Synchrotron Hamburg22607 Germany Duke University DurhamNC27708 United States University of Florida GainesvilleFL32611 United States Justus-Liebig-Universität Gießen Gießen35392 Germany Gifu University Gifu501-1193 Japan II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen37073 Germany SOKENDAI Graduate University for Advanced Studies Hayama240-0193 Japan Gyeongsang National University Chinju660-701 Korea Republic of Hanyang University Seoul133-791 Korea Republic of University of Hawaii HonoluluHI96822 United States Tsukuba305-0801 Japan Tsukuba305-0801 IKERBASQUE Basque Foundation for Science Bilbao48013 Spain Indian Institute of Technology Bhubaneswar Satya Nagar751007 India Indian Institute of Technology Guwahati Assam781039 India Indian Institute of Technology Hyderabad Telangana502285 India Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47408 United States Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Institute of High Energy Physics Vienna1050 Austria INFN Sezione di Napoli Napoli80126 Italy INFN Sezione di Torino Torino10125 Italy Advanced Science Research Center Japan Atomic Energy Agency Naka319-1195 J. Stefan Institute Ljubljana1000 Slovenia Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie Karlsruhe76131 Germany Kennesaw State University KennesawGA30144 United States King Abdulaziz City for Science and Technology Riyadh11442 Saudi Arabia Department of Physics Faculty of Science Ki

We report a measurement of the branching fractions of the decays B → D(∗)π`ν. The analysis uses 772×106 BB¯ pairs produced in e+e− → Υ(4S) data recorded by the Belle experiment at the KEKB asymmetric-energy e+e− collider. The tagging B meson in the decay is fully reconstructed in a hadronic decay mode. On the signal side, we reconstruct the decay B → D(∗)π`ν (` = e, µ). The measured branching fractions are B(B+ → D−π+`+ν ) = [4.55 ± 0.27 (stat.) ± 0.39 (syst.)]×10−3, B(B0 → D¯ 0π−`+ν ) = [4.05 ± 0.36 (stat.) ± 0.41 (syst.)]×10−3, B(B+ → D∗−π+`+ν ) = [6.03 ± 0.43 (stat.) ± 0.38 (syst.)]×10−3, and B(B0 → D¯ ∗0π−`+ν ) = [6.46 ± 0.53 (stat.) ± 0.52 (syst.)]×10−3. These are in good agreement with the current world average values. Copyright © 2018, The Authors. All rights reserved.

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Observation of γ(4S) → η′γ(1S)

arXiv

引用

arXiv 2018年

作者： Guido, E. Mussa, R. Tamponi, U. Aihara, H. Al Said, S. Asner, D.M. Atmacan, H. Aulchenko, V. Aushev, T. Ayad, R. Babu, V. Badhrees, I. Bakich, A.M. Bansal, V. Behera, P. Berger, M. Bhardwaj, V. Biswal, J. Bondar, A. Bonvicini, G. Bozek, A. Bračko, M. Browder, T.E. Cervenkov, D. Chekelian, V. Chen, A. Cheon, B.G. Chilikin, K. Cho, K. Choi, S.-K. Choi, Y. Choudhury, S. Cinabro, D. Cunliffe, S. Di Carlo, S. Doležal, Z. Eidelman, S. Epifanov, D. Fast, J.E. Ferber, T. Fulsom, B.G. Garg, R. Gaur, V. Gabyshev, N. Garmash, A. Gelb, M. Giri, A. Goldenzweig, P. Haba, J. Hara, T. Hayashii, H. Hedges, M.T. Hou, W.-S. Inami, K. Inguglia, G. Ishikawa, A. Itoh, R. Iwasaki, M. Iwasaki, Y. Jacobs, W.W. Jeon, H.B. Jia, S. Jin, Y. Julius, T. Kang, K.H. Karyan, G. Kawasaki, T. Kiesling, C. Kim, D.Y. Kim, J.B. Kim, K.T. Kim, S.H. Kinoshita, K. Kodyš, P. Korpar, S. Kotchetkov, D. Križan, P. Kroeger, R. Krokovny, P. Kulasiri, R. Kumar, R. Kumita, T. Kuzmin, A. Kwon, Y.-J. Lee, I.S. Lee, S.C. Li, L.K. Li, Y.B. Li Gioi, L. Libby, J. Liventsev, D. Lubej, M. Luo, T. MacNaughton, J. Masuda, M. Matsuda, T. Matvienko, D. Merola, M. Miyabayashi, K. Miyata, H. Mizuk, R. Mohanty, G.B. Moon, H.K. Mori, T. Nakano, E. Nakao, M. Nanut, T. Nath, K.J. Nayak, M. Niiyama, M. Nishida, S. Ogawa, S. Ono, H. Ostrowicz, W. Pakhlova, G. Pal, B. Pardi, S. Park, C.W. Paul, S. Pedlar, T.K. Pestotnik, R. Piilonen, L.E. Popov, V. Rostomyan, A. Russo, G. Sakai, Y. Salehi, M. Sanuki, T. Schneider, O. Schnell, G. Schwanda, C. Seino, Y. Shebalin, V. Shen, C.P. Shibata, T.-A. Shiu, J.-G. Shwartz, B. Sokolov, A. Starič, M. Strube, J.F. Sumihama, M. Sumiyoshi, T. Takizawa, M. Tanida, K. Tenchini, F. Uchida, M. Uglov, T. Unno, Y. Usov, Y. Van Hulse, C. Varner, G. Vinokurova, A. Wang, B. Wang, C.H. Wang, M.-Z. Wang, P. Wang, X.L. Watanabe, M. Watanabe, Y. Widmann, E. Won, E. Ye, H. Yelton, J. Yuan, C.Z. Yusa, Y. Zakharov, S. Zhang, Z.P. Zhilich, V. Zhukova, V. Zhulanov, V. University of the Basque Country UPV EHU Bilbao48080 Spain Beihang University Beijing100191 China Budker Institute of Nuclear Physics SB RAS Novosibirsk630090 Russia Faculty of Mathematics and Physics Charles University Prague121 16 Czech Republic University of Cincinnati CincinnatiOH45221 United States Deutsches Elektronen-Synchrotron Hamburg22607 Germany University of Florida GainesvilleFL32611 United States Fudan University Shanghai200443 China Gifu University Gifu501-1193 Japan Hayama240-0193 Japan Gyeongsang National University Chinju660-701 Korea Republic of Hanyang University Seoul133-791 Korea Republic of University of Hawaii HonoluluHI96822 United States Tsukuba305-0801 Japan Tsukuba305-0801 IKERBASQUE Basque Foundation for Science Bilbao48013 Spain Indian Institute of Science Education and Research Mohali SAS Nagar140306 India Indian Institute of Technology Guwahati Assam781039 India Indian Institute of Technology Hyderabad Telangana502285 India Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47408 United States Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Institute of High Energy Physics Vienna1050 Austria Institute for High Energy Physics Protvino142281 Russia INFN - Sezione di Napoli Napoli80126 Italy INFN - Sezione di Torino Torino10125 Italy Advanced Science Research Center Japan Atomic Energy Agency Naka319-1195 J. Stefan Institute Ljubljana1000 Slovenia Kanagawa University Yokohama221-8686 Japan Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie Karlsruhe76131 Germany Kennesaw State University KennesawGA30144 United States King Abdulaziz City for Science and Technology Riyadh11442 Saudi Arabia Department of Physics Faculty of Science King Abdulaziz University Jeddah21589 Korea Institute of Science and Technology Information Daejeon305-806 Korea Republic of Korea University S

We report the first observation of the hadronic transition γ(4S) → η′γ(1S), using 496 fb-1data collected at the γ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e-collider. We reconstruct the η′ meson through its decays to ρ0γ and to π+π-η, with η → γγ. We measure: B(γ(4S) → n′γ(1S)) = (3.43 ± 0.88(stat.) ± 0.21(syst.)) × 10-5, with a significance of 5.7σ. Copyright © 2018, The Authors. All rights reserved.

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Measurement of ηc(1S), ηc(2S) and non-resonant η′π+π− production via two-photon collisions

arXiv

引用

arXiv 2018年

作者： Xu, Q.N. Adachi, I. Aihara, H. Al Said, S. Asner, D.M. Atmacan, H. Aulchenko, V. Aushev, T. Ayad, R. Babu, V. Badhrees, I. Bakich, A.M. Bansal, V. Barberio, E. Behera, P. Berger, M. Bhardwaj, V. Bhuyan, B. Biswal, J. Bondar, A. Bozek, A. Bračko, M. Červenkov, D. Chen, A. Cheon, B.G. Chilikin, K. Cho, K. Choi, S.-K. Choi, Y. Cinabro, D. Cunliffe, S. Czank, T. Dash, N. Di Carlo, S. Doležal, Z. Drásal, Z. Eidelman, S. Epifanov, D. Fast, J.E. Ferber, T. Fulsom, B.G. Garg, R. Gaur, V. Gabyshev, N. Garmash, A. Gelb, M. Goldenzweig, P. Guan, Y. Guido, E. Haba, J. Hayasaka, K. Hayashii, H. Hedges, M.T. Hou, W.-S. Inami, K. Inguglia, G. Ishikawa, A. Itoh, R. Iwasaki, M. Iwasaki, Y. Jaegle, I. Jeon, H.B. Jin, Y. Joo, K.K. Julius, T. Kaliyar, A.B. Kang, K.H. Karyan, G. Kawasaki, T. Kichimi, H. Kiesling, C. Kim, D.Y. Kim, H.J. Kim, J.B. Kodyš, P. Korpar, S. Kotchetkov, D. Križan, P. Kroeger, R. Krokovny, P. Kulasiri, R. Kwon, Y.-J. Lee, I.S. Lee, S.C. Li, L.K. Li, Y. Li Gioi, L. Libby, J. Liventsev, D. Lubej, M. Luo, T. Masuda, M. Matsuda, T. Matvienko, D. Merola, M. Miyabayashi, K. Miyata, H. Mizuk, R. Moon, H.K. Mori, T. Mussa, R. Nanut, T. Nath, K.J. Natkaniec, Z. Nayak, M. Nisar, N.K. Nishida, S. Okuno, S. Ono, H. Onuki, Y. Pakhlov, P. Pakhlova, G. Pal, B. Park, H. Paul, S. Pedlar, T.K. Pestotnik, R. Piilonen, L.E. Popov, V. Ritter, M. Rostomyan, A. Russo, G. Sakai, Y. Salehi, M. Sandilya, S. Sanuki, T. Savinov, V. Schneider, O. Schnell, G. Schwanda, C. Seino, Y. Senyo, K. Seon, O. Sevior, M.E. Shebalin, V. Shen, C.P. Shibata, T.-A. Shimizu, N. Shiu, J.-G. Sokolov, A. Solovieva, E. Starič, M. Strube, J.F. Sumiyoshi, T. Takizawa, M. Tamponi, U. Tanida, K. Tenchini, F. Uchida, M. Uehara, S. Uglov, T. Unno, Y. Uno, S. Urquijo, P. Van Hulse, C. Varner, G. Vinokurova, A. Vorobyev, V. Vossen, A. Wang, B. Wang, C.H. Wang, M.-Z. University of the Basque Country UPV/EHU Bilbao48080 Spain Beihang University Beijing100191 China Budker Institute of Nuclear Physics SB RAS Novosibirsk630090 Russia Faculty of Mathematics and Physics Charles University Prague121 16 Czech Republic Chonnam National University Kwangju660-701 Korea Republic of University of Cincinnati CincinnatiOH45221 United States Deutsches Elektronen-Synchrotron Hamburg22607 Germany University of Florida GainesvilleFL32611 United States SOKENDAI Graduate University for Advanced Studies Hayama240-0193 Japan Hanyang University Seoul133-791 Korea Republic of University of Hawaii HonoluluHI96822 United States Tsukuba305-0801 Japan Tsukuba305-0801 IKERBASQUE Basque Foundation for Science Bilbao48013 Spain Indian Institute of Science Education and Research Mohali SAS Nagar140306 India Indian Institute of Technology Bhubaneswar Satya Nagar751007 India Indian Institute of Technology Guwahati Assam781039 India Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47408 United States Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Institute of High Energy Physics Vienna1050 Austria Institute for High Energy Physics Protvino142281 Russia INFN - Sezione di Napoli Napoli80126 Italy INFN - Sezione di Torino Torino10125 Italy Advanced Science Research Center Japan Atomic Energy Agency Naka319-1195 J. Stefan Institute Ljubljana1000 Slovenia Kanagawa University Yokohama221-8686 Japan Institut für Experimentelle Kernphysik Karlsruher Institut für Technologie Karlsruhe76131 Germany Kennesaw State University KennesawGA30144 United States King Abdulaziz City for Science and Technology Riyadh11442 Saudi Arabia Department of Physics Faculty of Science King Abdulaziz University Jeddah21589 Korea Institute of Science and Technology Information Daejeon305-806 Korea Republic of Korea University Seoul136-713 Korea Republic of

We report the measurement of γγ → ηc(1S), ηc(2S) → η′π+π− with η′ decays to γρ and ηπ+π− using 941 fb−1 of data collected with the Belle detector at the KEKB asymmetric-energy e+e− collider. The ηc(1S) mass and width are measured to be M = [2984.6 ± 0.7 (stat) ± 2.2 (syst) ± 0.3 (model)] MeV/c2 and Γ = [30.8+2−2..32 (stat) ± 2.5 (syst) ± 1.4 (model)] MeV, respectively. First observation of ηc(2S) → η′π+π− with a significance of 5.5σ including systematic error is obtained, and the ηc(2S) mass is measured to be M = [3635.1 ± 3.7 (stat) ± 2.9 (syst) ± 0.4 (model)] MeV/c2. The products of the two-photon decay width and branching fraction (B) of decays to η′π+π− are determined to be ΓγγB = [65.4 ± 2.6 (stat) ± 7.8 (syst)] eV for ηc(1S) and [5.6+1−1..21 (stat) ± 1.1 (syst)] eV for ηc(2S). The cross sections for γγ → η′π+π− and η′f2(1270) are measured for the first time. Copyright © 2018, The Authors. All rights reserved.

关键词： Photons

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Measurement of the branching fraction and time-dependent CP asymmetry for B0 → J/ψπ0 decays

arXiv

引用

arXiv 2018年

作者： Pal, B. Schwartz, A.J. Aihara, H. Al Said, S. Asner, D.M. Atmacan, H. Aulchenko, V. Aushev, T. Ayad, R. Badhrees, I. Bahinipati, S. Bansal, V. Behera, P. Beleño, C. Bhuyan, B. Bilka, T. Biswal, J. Bozek, A. Bračko, M. Cao, L. Červenkov, D. Chekelian, V. Chen, A. Cheon, B.G. Chilikin, K. Cho, K. Choi, Y. Choudhury, S. Cinabro, D. Cunliffe, S. Dash, N. Di Carlo, S. Doležal, Z. Eidelman, S. Epifanov, D. Fast, J.E. Fulsom, B.G. Garg, R. Gaur, V. Garmash, A. Gelb, M. Giri, A. Goldenzweig, P. Golob, B. Guan, Y. Hara, T. Hayasaka, K. Hayashii, H. Higuchi, T. Hou, W.-S. Hsu, C.-L. Inami, K. Ishikawa, A. Itoh, R. Iwasaki, M. Iwasaki, Y. Jacobs, W.W. Jia, S. Joffe, D. Julius, T. Karyan, G. Kim, D.Y. Kim, K.T. Kim, S.H. Kinoshita, K. Kodyš, P. Kotchetkov, D. Križan, P. Kroeger, R. Krokovny, P. Kulasiri, R. Kumar, R. Kuzmin, A. Kwon, Y.-J. Lalwani, K. Lee, S.C. Li, L.K. Li, Y.B. Li Gioi, L. Libby, J. Lu, P.-C. Masuda, M. Matsuda, T. Matvienko, D. Merola, M. Miyabayashi, K. Miyata, H. Mizuk, R. Mohanty, G.B. Mori, T. Nakano, E. Nakao, M. Nath, K.J. Natkaniec, Z. Nishida, S. Ogawa, S. Ono, H. Pakhlova, G. Pardi, S. Park, H. Paul, S. Pedlar, T.K. Pestotnik, R. Piilonen, L.E. Popov, V. Prencipe, E. Purohit, M.V. Ritter, M. Russo, G. Sahoo, D. Sakai, Y. Sandilya, S. Santelj, L. Sanuki, T. Savinov, V. Schneider, O. Schnell, G. Schueler, J. Schwanda, C. Seino, Y. Senyo, K. Seon, O. Sevior, M.E. Shibata, T.-A. Simon, F. Sokolov, A. Solovieva, E. Starič, M. Sumihama, M. Sumiyoshi, T. Takizawa, M. Tamponi, U. Tanida, K. Tao, Y. Tenchini, F. Trabelsi, K. Uchida, M. Uehara, S. Uglov, T. Unno, Y. Uno, S. Vahsen, S.E. van Tonder, R. Varner, G. Varvell, K.E. Vorobyev, V. Wang, B. Wang, C.H. Wang, M.-Z. Wang, P. Wang, X.L. Widmann, E. Won, E. Yelton, J. Yin, J.H. Zhang, Z.P. Zhilich, V. Zhukova, V. University of the Basque Country UPV/EHU Bilbao48080 Spain Beihang University Beijing100191 China Brookhaven National Laboratory UptonNY11973 United States Budker Institute of Nuclear Physics SB RAS Novosibirsk630090 Russia Faculty of Mathematics and Physics Charles University Prague121 16 Czech Republic University of Cincinnati CincinnatiOH45221 United States Deutsches Elektronen–Synchrotron Hamburg22607 Germany University of Florida GainesvilleFL32611 United States Institute of Modern Physics Fudan University Shanghai200443 Gifu University Gifu501-1193 Japan II. Physikalisches Institut Georg-August-Universität Göttingen Göttingen37073 Germany SOKENDAI Graduate University for Advanced Studies Hayama240-0193 Japan Hanyang University Seoul133-791 Korea Republic of University of Hawaii HonoluluHI96822 United States Tsukuba305-0801 Japan Tsukuba305-0801 Forschungszentrum Jülich Jülich52425 Germany IKERBASQUE Basque Foundation for Science Bilbao48013 Spain Indian Institute of Technology Bhubaneswar Satya Nagar751007 India Indian Institute of Technology Guwahati Assam781039 India Indian Institute of Technology HyderabadTelangana502285 India Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47408 United States Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Institute of High Energy Physics Vienna1050 Austria Institute for High Energy Physics Protvino 142281 Russia INFN - Sezione di Napoli Napoli80126 Italy INFN - Sezione di Torino Torino10125 Italy Advanced Science Research Center Japan Atomic Energy Agency Naka319-1195 J. Stefan Institute Ljubljana1000 Slovenia Institut für Experimentelle Teilchenphysik Karlsruher Institut für Technologie Karlsruhe76131 Germany University of Tokyo Kashiwa277-8583 Japan Kennesaw State University Kennesaw Georgia30144 United States King Abdulaziz City for Science and Technology Riyadh11442 Saudi

We measure the branching fraction and time-dependent CP-violating asymmetry for B0 → J/ψπ0 decays using a data sample of 711 fb−1 collected on the Υ(4S) resonance by the Belle experiment running at the KEKB e+e− collider. The branching fraction is measured to be B(B0 → J/ψπ0) = [1.62 ± 0.11 (stat) ± 0.06 (syst)] × 10−5, which is the most precise measurement to date. The measured CP asymmetry parameters are S = −0.59 ± 0.19 (stat) ± 0.03 (syst) and A = −0.15 ± 0.14 (stat) +0−0..0403 (syst). The mixing-induced CP asymmetry (S) differs from the case of no CP violation by 3.0 standard deviations, and the direct CP asymmetry (A) is consistent with zero. Copyright © 2018, The Authors. All rights reserved.

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Measurement of the Decays Λc → Σππ at Belle

arXiv

引用

arXiv 2018年

作者： Berger, M. Schwanda, C. Suzuki, K. Adachi, I. Ahn, J.K. Aihara, H. Al Said, S. Asner, D.M. Atmacan, H. Aulchenko, V. Aushev, T. Ayad, R. Babu, V. Badhrees, I. Bakich, A.M. Bansal, V. Behera, P. Bhardwaj, V. Bhuyan, B. Biswal, J. Bonvicini, G. Bozek, A. Bračko, M. Browder, T.E. Červenkov, D. Chen, A. Cheon, B.G. Chilikin, K. Cho, K. Choi, Y. Cinabro, D. Czank, T. Dash, N. Di Carlo, S. Doležal, Z. Dutta, D. Eidelman, S. Epifanov, D. Fast, J.E. Ferber, T. Fulsom, B.G. Garg, R. Gaur, V. Gabyshev, N. Garmash, A. Gelb, M. Giri, A. Goldenzweig, P. Grzymkowska, O. Guan, Y. Guido, E. Haba, J. Hara, T. Hayasaka, K. Hayashii, H. Hedges, M.T. Hou, W.-S. Iijima, T. Inami, K. Inguglia, G. Ishikawa, A. Itoh, R. Iwasaki, M. Iwasaki, Y. Jacobs, W.W. Jaegle, I. Jia, S. Jin, Y. Joo, K.K. Julius, T. Kaliyar, A.B. Kang, K.H. Karyan, G. Kawasaki, T. Kichimi, H. Kiesling, C. Kim, D.Y. Kim, H.J. Kim, J.B. Kim, K.T. Kim, S.H. Kinoshita, K. Kodyš, P. Korpar, S. Kotchetkov, D. Križan, P. Kroeger, R. Krokovny, P. Kuhr, T. Kulasiri, R. Kuzmin, A. Kwon, Y.-J. Lange, J.S. Lee, I.S. Lee, S.C. Li, L.K. Li, Y. Li Gioi, L. Libby, J. Liventsev, D. Lubej, M. Luo, T. Masuda, M. Matsuda, T. Matvienko, D. Merola, M. Miyabayashi, K. Miyata, H. Mizuk, R. Mohanty, G.B. Moon, H.K. Mori, T. Mussa, R. Nakano, T. Nakao, M. Nanut, T. Nath, K.J. Natkaniec, Z. Nayak, M. Niiyama, M. Nisar, N.K. Nishida, S. Okuno, S. Ono, H. Onuki, Y. Pakhlov, P. Pakhlova, G. Pal, B. Park, H. Paul, S. Pavelkin, I. Pedlar, T.K. Pestotnik, R. Piilonen, L.E. Popov, V. Ritter, M. Rostomyan, A. Russo, G. Sakai, Y. Salehi, M. Sandilya, S. Santelj, L. Sanuki, T. Savinov, V. Schneider, O. Schnell, G. Schwartz, A.J. Seino, Y. Senyo, K. Seon, O. Sevior, M.E. Shebalin, V. Shen, C.P. Shibata, T.-A. Shimizu, N. Shiu, J.-G. Shwartz, B. Simon, F. Sokolov, A. Solovieva, E. Starič, M. Strube, J.F. Sumihama, M. University of the Basque Country UPV EHU Bilbao48080 Spain Beihang University Beijing100191 China Budker Institute of Nuclear Physics SB RAS Novosibirsk630090 Russia Faculty of Mathematics and Physics Charles University Prague121 16 Czech Republic Chonnam National University Kwangju660-701 Korea Republic of University of Cincinnati CincinnatiOH45221 United States Deutsches Elektronen-Synchrotron Hamburg22607 Germany University of Florida GainesvilleFL32611 United States Gifu University Gifu501-1193 Japan SOKENDAI Graduate University for Advanced Studies Hayama240-0193 Japan Hanyang University Seoul133-791 Korea Republic of University of Hawaii HonoluluHI96822 United States Tsukuba305-0801 Japan Tsukuba305-0801 IKERBASQUE Basque Foundation for Science Bilbao48013 Spain Indian Institute of Science Education and Research Mohali SAS Nagar140306 India Indian Institute of Technology Bhubaneswar Satya Nagar751007 India Indian Institute of Technology Guwahati Assam781039 India Indian Institute of Technology Hyderabad Telangana502285 India Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47408 United States Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China Institute of High Energy Physics Vienna1050 Austria Institute for High Energy Physics Protvino142281 Russia INFN - Sezione di Napoli Napoli80126 Italy INFN - Sezione di Torino Torino10125 Italy Advanced Science Research Center Japan Atomic Energy Agency Naka319-1195 J. Stefan Institute Ljubljana1000 Slovenia Kanagawa University Yokohama221-8686 Japan Institut für Experimentelle Kernphysik Karlsruher Institut für Technologie Karlsruhe76131 Germany Kennesaw State University Kennesaw30144 Georgia King Abdulaziz City for Science and Technology Riyadh11442 Saudi Arabia Department of Physics Faculty of Science King Abdulaziz University Jeddah21589 Korea Institute of Science and Technology Info

We report measurements of the branching fractions of the decays Λ+c → Σ+π−π+, Λ+c → Σ0π+π0 and Λ+c → Σ+π0π0 relative to the reference channel Λ+c → pK−π+. The analysis is based on the full data sample collected at and near the Υ(4S) resonance by the Belle detector at the KEKB asymmetric-energy e+e− collider, corresponding to an integrated luminosity of 711 fb−1. We measure B(Λ+c → Σ+π−π+)/B(Λ+c → pK−π+) = 0.719 ± 0.003 ± 0.024, B(Λ+c → Σ0π+π0)/B(Λ+c → pK−π+) = 0.575 ±0.005 ±0.036 and B(Λ+c → Σ+π0π0)/B(Λ+c → pK−π+) = 0.247 ±0.006 ±0.019. The listed uncertainties are statistical and systematic, respectively. Copyright © 2018, The Authors. All rights reserved.

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