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Observation of D0→ρ0γ and Search for CP Violation in Radiative Charm Decays

Physical Review Letters 2017年第5期118卷 051801-051801页

作者： T. Nanut A. Zupanc I. Adachi H. Aihara S. Al Said D. M. Asner V. Aulchenko T. Aushev R. Ayad V. Babu I. Badhrees A. M. Bakich V. Bansal P. Behera V. Bhardwaj J. Biswal A. Bondar A. Bozek M. Bračko T. E. Browder D. Červenkov V. Chekelian A. Chen B. G. Cheon R. Chistov K. Cho S.-K. Choi Y. Choi D. Cinabro N. Dash S. Di Carlo Z. Doležal D. Dutta S. Eidelman H. Farhat J. E. Fast T. Ferber B. G. Fulsom V. Gaur N. Gabyshev A. Garmash R. Gillard P. Goldenzweig B. Golob K. Hayasaka H. Hayashii W.-S. Hou T. Iijima K. Inami G. Inguglia A. Ishikawa Y. Iwasaki W. W. Jacobs I. Jaegle D. Joffe K. K. Joo T. Julius A. B. Kaliyar K. H. Kang T. Kawasaki D. Y. Kim J. B. Kim K. T. Kim M. J. Kim S. H. Kim K. Kinoshita P. Kodyš S. Korpar P. Krokovny T. Kuhr R. Kulasiri A. Kuzmin Y.-J. Kwon J. S. Lange I. S. Lee C. H. Li L. Li Y. Li L. Li Gioi J. Libby D. Liventsev M. Lubej M. Masuda T. Matsuda D. Matvienko K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty H. K. Moon M. Nakao K. J. Nath M. Nayak N. K. Nisar S. Nishida S. Ogawa S. Okuno P. Pakhlov G. Pakhlova B. Pal C.-S. Park C. W. Park H. Park S. Paul T. K. Pedlar L. Pesántez R. Pestotnik M. Petrič L. E. Piilonen K. Prasanth C. Pulvermacher J. Rauch M. Ritter A. Rostomyan Y. Sakai S. Sandilya L. Santelj T. Sanuki Y. Sato V. Savinov T. Schlüter O. Schneider G. Schnell C. Schwanda A. J. Schwartz Y. Seino K. Senyo O. Seon M. E. Sevior V. Shebalin C. P. Shen T.-A. Shibata J.-G. Shiu B. Shwartz E. Solovieva S. Stanič M. Starič J. F. Strube J. Stypula T. Sumiyoshi M. Takizawa U. Tamponi F. Tenchini K. Trabelsi M. Uchida S. Uno Y. Ushiroda G. Varner A. Vinokurova V. Vorobyev A. Vossen C. H. Wang M.-Z. Wang P. Wang Y. Watanabe E. Widmann E. Won J. Yamaoka Y. Yamashita J. Yelton Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov J. Stefan Institute 1000 Ljubljana Faculty of Mathematics and Physics University of Ljubljana 1000 Ljubljana 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 Pacific Northwest National Laboratory Richland Washington 99352 Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 Moscow Institute of Physics and Technology Moscow Region 141700 Tata Institute of Fundamental Research Mumbai 400005 King Abdulaziz City for Science and Technology Riyadh 11442 School of Physics University of Sydney New South Wales 2006 Indian Institute of Technology Madras Chennai 600036 Indian Institute of Science Education and Research Mohali SAS Nagar 140306 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 University of Maribor 2000 Maribor University of Hawaii Honolulu Hawaii 96822 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 Moscow Physical Engineering Institute Moscow 115409 Korea Institute of Science and Technology Information Daejeon 305-806 Gyeongsang National University Chinju 660-701 Sungkyunkwan University Suwon 440-746 Wayne State University Detroit Michigan 48202 Indian Institute of Technology Bhubaneswar Satya Nagar 751007 Deutsches Elektronen–Synchrotron 22607 Hamburg Institut für Experimentelle Kernphysik Karlsruher Institut für Technologie 76131 Karlsruhe Niigata University Niigata 950-2181 Nara Women’s University Nara 630-8506 Department of Physics National Taiwan University Taipei 10617 Kob

We report the first observation of the radiative charm decay D0→ρ0γ and the first search for CP violation in decays D0→ρ0γ, ϕγ, and K¯*0(892)γ, using a data sample of 943 fb−1 collected with the Belle detector at the KEKB asymmetric-energy e+e− collider. The branching fraction is measured to be B(D0→ρ0γ)=(1.77±0.30±0.07)×10−5, where the first uncertainty is statistical and the second is systematic. The obtained CP asymmetries ACP(D0→ρ0γ)=+0.056±0.152±0.006, ACP(D0→ϕγ)=−0.094±0.066±0.001, and ACP(D0→K¯*0γ)=−0.003±0.020±0.000 are consistent with no CP violation. We also present an improved measurement of the branching fractions B(D0→ϕγ)=(2.76±0.19±0.10)×10−5 and B(D0→K¯*0γ)=(4.66±0.21±0.21)×10−4.

关键词： Branching fraction Electroweak interaction Leptonic, semileptonic & radiative decays Rare decays Charmed mesons CP violation Artificial neural networks Lepton colliders

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Search for CP Violation and Measurement of the Branching Fraction in the Decay D0→KS0KS0

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Physical Review Letters 2017年第17期119卷 171801-171801页

作者： N. Dash S. Bahinipati V. Bhardwaj K. Trabelsi I. Adachi H. Aihara S. Al Said D. M. Asner V. Aulchenko T. Aushev R. Ayad V. Babu I. Badhrees A. M. Bakich V. Bansal E. Barberio B. Bhuyan J. Biswal A. Bobrov A. Bondar G. Bonvicini A. Bozek M. Bračko F. Breibeck T. E. Browder D. Červenkov M.-C. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin K. Cho Y. Choi D. Cinabro S. Di Carlo Z. Doležal Z. Drásal D. Dutta S. Eidelman D. Epifanov H. Farhat J. E. Fast T. Ferber B. G. Fulsom V. Gaur N. Gabyshev A. Garmash R. Gillard P. Goldenzweig J. Haba T. Hara K. Hayasaka H. Hayashii M. T. Hedges W.-S. Hou T. Iijima K. Inami A. Ishikawa R. Itoh Y. Iwasaki W. W. Jacobs I. Jaegle H. B. Jeon Y. Jin D. Joffe K. K. Joo T. Julius J. Kahn A. B. Kaliyar G. Karyan P. Katrenko T. Kawasaki C. Kiesling D. Y. Kim H. J. Kim J. B. Kim K. T. Kim M. J. Kim S. H. Kim Y. J. Kim K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan P. Krokovny T. Kuhr R. Kulasiri R. Kumar T. Kumita A. Kuzmin Y.-J. Kwon J. S. Lange I. S. Lee C. H. Li L. Li Y. Li L. Li Gioi J. Libby D. Liventsev M. Lubej T. Luo M. Masuda D. Matvienko M. Merola K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty S. 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 S. Ogawa S. Okuno H. Ono P. Pakhlov G. Pakhlova B. Pal S. Pardi C.-S. Park H. Park S. Paul T. K. Pedlar L. Pesántez R. Pestotnik L. E. Piilonen K. Prasanth M. Ritter A. Rostomyan H. Sahoo Y. Sakai S. Sandilya L. Santelj T. Sanuki Y. Sato 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 J.-G. Shiu B. Shwartz F. Simon A. Sokolov E. Solovieva M. Starič J. F. Strube J. Stypula K. Sumisawa T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida F. Tenchini M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov C. Van Hulse G. Varner V. Vorobyev A. Vossen E. Waheed C. H. Wang M.-Z. Wang P. Wang M. Watanabe Y. Watanabe E. Widmann K. M. Williams E. Won Y. Yamashita H. Ye J. Yelton Y. Yo Indian Institute of Technology Bhubaneswar Satya Nagar 751007 Indian Institute of Science Education and Research Mohali SAS Nagar 140306 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 Pacific Northwest National Laboratory Richland Washington 99352 Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 Moscow Institute of Physics and Technology Moscow Region 141700 Tata Institute of Fundamental Research Mumbai 400005 King Abdulaziz City for Science and Technology Riyadh 11442 School of Physics University of Sydney New South Wales 2006 School of Physics University of Melbourne Victoria 3010 Indian Institute of Technology Guwahati Assam 781039 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 Institute of High Energy Physics Vienna 1050 University of Hawaii Honolulu Hawaii 96822 Faculty of Mathematics and Physics Charles University 121 16 Prague Department of Physics Fu Jen Catholic University Taipei 24205 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 Moscow Physical Engineering Institute Moscow 115409 Korea Institute of Science and Technology Information Daejeon 305-806 Sungkyunkwan University Suwon 440-746 Deutsches Elektronen–Synchrotron 22607 Hamburg Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 Institut für Experimentelle Kernphysik Karlsruher Institut für Technologie 76131 Karlsruhe Niigata Universit

We report a study of the decay D0→KS0KS0 using 921 fb−1 of data collected at or near the ϒ(4S) and ϒ(5S) resonances with the Belle detector at the KEKB asymmetric energy e+e− collider. The measured time-integrated CP asymmetry is ACP(D0→KS0KS0)=(−0.02±1.53±0.02±0.17)%, and the branching fraction is B(D0→KS0KS0)=(1.321±0.023±0.036±0.044)×10−4, where the first uncertainty is statistical, the second is systematic, and the third is due to the normalization mode (D0→KS0π0). These results are significantly more precise than previous measurements available for this mode. The ACP measurement is consistent with the standard model expectation.

关键词： Hadronic decays Charmed mesons CP violation Lepton colliders

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Evidence for Isospin Violation and Measurement of CP Asymmetries in B→K*(892)γ

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Physical Review Letters 2017年第19期119卷 191802-191802页

作者： T. Horiguchi A. Ishikawa H. Yamamoto I. Adachi H. Aihara S. Al Said D. M. Asner V. Aulchenko T. Aushev R. Ayad V. Babu I. Badhrees A. M. Bakich V. Bansal P. Behera V. Bhardwaj B. Bhuyan J. Biswal A. Bobrov G. Bonvicini A. Bozek M. Bračko T. E. Browder D. Červenkov V. Chekelian A. Chen B. G. Cheon K. Chilikin K. Cho Y. Choi D. Cinabro T. Czank N. Dash S. Di Carlo Z. Doležal Z. Drásal D. Dutta S. Eidelman D. Epifanov H. Farhat J. E. Fast T. Ferber B. G. Fulsom V. Gaur N. Gabyshev A. Garmash M. Gelb R. Gillard P. Goldenzweig B. Golob Y. Guan E. Guido J. Haba T. Hara K. Hayasaka H. Hayashii M. T. Hedges T. Higuchi S. Hirose W.-S. Hou T. Iijima K. Inami G. Inguglia R. Itoh 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 D. Y. Kim J. B. Kim K. T. Kim M. J. Kim S. H. Kim Y. J. Kim K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan P. Krokovny T. Kuhr R. Kulasiri R. Kumar T. Kumita A. Kuzmin Y.-J. Kwon J. S. Lange C. H. Li L. Li L. Li Gioi J. Libby D. Liventsev M. Lubej T. Luo M. Masuda T. Matsuda D. Matvienko M. Merola K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty S. Mohanty H. K. Moon T. Mori R. Mussa E. Nakano M. Nakao T. Nanut K. J. Nath Z. Natkaniec M. Nayak N. K. Nisar S. Nishida S. Ogawa S. Okuno H. Ono P. Pakhlov G. Pakhlova B. Pal S. Pardi C.-S. Park H. Park S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen K. Prasanth C. Pulvermacher J. Rauch A. Rostomyan Y. Sakai S. Sandilya L. Santelj V. Savinov O. Schneider G. Schnell C. Schwanda A. J. Schwartz Y. Seino K. Senyo I. S. Seong M. E. Sevior V. Shebalin C. P. Shen T.-A. Shibata J.-G. Shiu F. Simon A. Sokolov E. Solovieva M. Starič J. F. Strube K. Sumisawa T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida F. Tenchini K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo Y. Ushiroda Y. Usov C. Van Hulse G. Varner A. Vinokurova V. Vorobyev A. Vossen C. H. Wang M.-Z. Wang P. Wang Y. Watanabe S. Watanuki T. Weber E. Widmann E. Won Y. Yamashita H. Ye Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov A. Zup 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 Pacific Northwest National Laboratory Richland Washington 99352 Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 Moscow Institute of Physics and Technology Moscow Region 141700 Tata Institute of Fundamental Research Mumbai 400005 King Abdulaziz City for Science and Technology Riyadh 11442 School of Physics University of Sydney Sydney New South Wales 2006 Indian Institute of Technology Madras Chennai 600036 Indian Institute of Science Education and Research Mohali SAS Nagar 140306 Indian Institute of Technology Guwahati Assam 781039 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 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 Moscow Physical Engineering Institute Moscow 115409 Korea Institute of Science and Technology Information Daejeon 305-806 Sungkyunkwan University Suwon 440-746 Indian Institute of Technology Bhubaneswar Satya Nagar 751007 Deutsches Elektronen–Synchrotron 22607 Hamburg Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 Institut für Experimentelle Kernphysik Karlsruher Institut für Technologie 76131 Karlsruhe Faculty of Mathematics and Physics University of Ljubljana 1000

We report the first evidence for isospin violation in B→K*γ and the first measurement of the difference of CP asymmetries between B+→K*+γ and B0→K*0γ. This analysis is based on the data sample containing 772×106BB¯ pairs that was collected with the Belle detector at the KEKB energy-asymmetric e+e− collider. We find evidence for the isospin violation with a significance of 3.1σ, Δ0+=[+6.2±1.5(stat)±0.6(syst)±1.2(f+−/f00)]%, where the third uncertainty is due to the uncertainty on the fraction of B+B− to B0B¯0 production in ϒ(4S) decays. The measured value is consistent with predictions of the standard model. The result for the difference of CP asymmetries is ΔACP=[+2.4±2.8(stat)±0.5(syst)]%, consistent with zero. The measured branching fractions and CP asymmetries for charged and neutral B meson decays are the most precise to date. We also calculate the ratio of branching fractions of B0→K*0γ to Bs0→ϕγ.

关键词： Leptonic, semileptonic & radiative decays Heavy mesons CP violation Lepton colliders

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Measurement of cos2β in B0→D(*)h0 with D→KS0π+π− decays by a combined time-dependent Dalitz plot analysis of BaBar and Belle data

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Physical Review D 2018年第11期98卷 112012-112012页

作者： I. Adachi T. Adye H. Ahmed J. K. Ahn H. Aihara S. Akar M. S. Alam J. Albert F. Anulli N. Arnaud D. M. Asner D. Aston H. Atmacan T. Aushev R. Ayad I. Badhrees A. M. Bakich Sw. Banerjee V. Bansal R. J. Barlow G. Batignani A. Beaulieu P. Behera M. Bellis E. Ben-Haim D. Bernard F. U. Bernlochner S. Bettarini D. Bettoni A. J. Bevan V. Bhardwaj B. Bhuyan F. Bianchi M. Biasini J. Biswal V. E. Blinov M. Bomben A. Bondar G. R. Bonneaud A. Bozek C. Bozzi M. Bračko T. E. Browder D. N. Brown C. Bünger P. R. Burchat A. R. Buzykaev R. Calabrese A. Calcaterra G. Calderini S. Di Carlo M. Carpinelli C. Cartaro G. Casarosa R. Cenci D. S. Chao J. Chauveau R. Cheaib A. Chen C. Chen C. H. Cheng B. G. Cheon K. Chilikin K. Cho Y. Choi S. Choudhury M. Chrzaszcz G. Cibinetto D. Cinabro J. Cochran J. P. Coleman M. R. Convery G. Cowan R. Cowan L. Cremaldi S. Cunliffe N. Dash M. Davier C. L. Davis F. De Mori G. De Nardo A. G. Denig R. de Sangro B. Dey F. Di Lodovico S. Dittrich Z. Doležal J. Dorfan Z. Drásal V. P. Druzhinin W. Dunwoodie M. Ebert B. Echenard S. Eidelman G. Eigen A. M. Eisner S. Emery D. Epifanov J. A. Ernst R. Faccini J. E. Fast M. Feindt F. Ferrarotto F. Ferroni R. C. Field A. Filippi G. Finocchiaro E. Fioravanti K. T. Flood F. Forti M. Fritsch B. G. Fulsom E. Gabathuler D. Gamba R. Garg A. Garmash J. W. Gary I. Garzia V. Gaur A. Gaz M. Gelb T. J. Gershon L. Li Gioi M. A. Giorgi A. Giri R. Godang P. Goldenzweig B. Golob V. B. Golubev R. Gorodeisky W. Gradl M. T. Graham E. Grauges K. Griessinger A. V. Gritsan O. Grünberg E. Guido N. Guttman A. Hafner T. Hara P. F. Harrison C. Hast K. Hayasaka C. Hearty M. Heck M. T. Hedges M. Heß S. Hirose D. G. Hitlin K. Honscheid W.-S. Hou Z. Huard C. Van Hulse D. E. Hutchcroft K. Inami G. Inguglia W. R. Innes A. Ishikawa R. Itoh Y. Iwasaki J. M. Izen W. W. Jacobs A. Jawahery C. P. Jessop S. Jia Y. Jin K. K. Joo T. Julius A. B. Kaliyar K. H. Kang G. Karyan R. Kass H. Kichimi D. Y. Kim J. B. Kim K. T. Kim S. H. Kim J. Kim P. Kim G. J. King K. Kinoshita H. Koch P. Kodyš Yu. G. Kolomensky S. High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 Japan SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 Japan Rutherford Appleton Laboratory Chilton Didcot Oxon OX11 0QX United Kingdom St. Francis Xavier University Antigonish Nova Scotia Canada B2G 2W5 Korea University Seoul 136-713 South Korea Department of Physics University of Tokyo Tokyo 113-0033 Japan Laboratoire de Physique Nucléaire et de Hautes Energies IN2P3/CNRS Université Pierre et Marie Curie-Paris6 Université Denis Diderot-Paris7 F-75252 Paris France State University of New York Albany New York 12222 USA University of Victoria Victoria British Columbia Canada V8W 3P6 INFN Sezione di Roma I-00185 Roma Italy Brookhaven National Laboratory Upton New York 11973 USA SLAC National Accelerator Laboratory Stanford California 94309 USA University of South Carolina Columbia South Carolina 29208 USA University of Mississippi University Mississippi 38677 USA Department of Physics Faculty of Science University of Tabuk Tabuk 71451 Kingdom of Saudi Arabia King Abdulaziz City for Science and Technology Riyadh 11442 Kingdom of Saudi Arabia School of Physics University of Sydney New South Wales 2006 Australia University of Louisville Louisville Kentucky 40292 USA Pacific Northwest National Laboratory Richland Washington 99352 USA University of Manchester Manchester M13 9PL United Kingdom INFN Sezione di Pisa I-56127 Pisa Italy Dipartimento di Fisica Università di Pisa I-56127 Pisa Italy Indian Institute of Technology Madras Chennai 600036 India Universität Rostock D-18051 Rostock Germany Laboratoire Leprince-Ringuet Ecole Polytechnique CNRS/IN2P3 F-91128 Palaiseau France INFN Sezione di Ferrara I-44122 Ferrara Italy Queen Mary University of London London E1 4NS United Kingdom Indian Institute of Science Education and Research Mohali SAS Nagar 140306 India Indian Institute of Technology Guwahati Assam 781039 India INFN Sezione di Torino I-10125

We report measurements of sin2β and cos2β using a time-dependent Dalitz plot analysis of B0→D(*)h0 with D→KS0π+π− decays, where the light unflavored and neutral hadron h0 is a π0, η, or ω meson. The analysis uses a combination of the final data sets of the BaBar and Belle experiments containing 471×106 and 772×106 BB¯ pairs collected at the ϒ(4S) resonance at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. We measure sin2β=0.80±0.14(stat)±0.06(syst)±0.03(model) and cos2β=0.91±0.22(stat)±0.09(syst)±0.07(model). The result for the direct measurement of the angle is β=(22.5±4.4(stat)±1.2(syst)±0.6(model))°. The last quoted uncertainties are due to the composition of the D0→KS0π+π− decay amplitude model, which is newly established by a Dalitz plot amplitude analysis of a high-statistics e+e−→cc¯ data sample as part of this analysis. We find the first evidence for cos2β>0 at the level of 3.7 standard deviations. The measurement excludes the trigonometric multifold solution π/2−β=(68.1±0.7)° at the level of 7.3 standard deviations and therefore resolves an ambiguity in the determination of the apex of the CKM Unitarity Triangle. The hypothesis of β=0° is ruled out at the level of 5.1 standard deviations, and thus CP violation is observed in B0→D(*)h0 decays. The measurement assumes no direct CP violation in B0→D(*)h0 decays.

关键词： CP violation

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Measurement of the decays B→ηℓνℓ and B→η′ℓνℓ in fully reconstructed events at Belle

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Physical Review D 2017年第9期96卷 091102(R)-091102(R)页

作者： C. Beleño J. Dingfelder P. Urquijo H. Aihara S. Al Said D. M. Asner T. Aushev R. Ayad V. Babu I. Badhrees A. M. Bakich V. Bansal P. Behera B. Bhuyan J. Biswal A. Bobrov M. Bračko T. E. Browder D. Červenkov A. Chen B. G. Cheon R. Chistov K. Cho S.-K. Choi Y. Choi D. Cinabro N. Dash S. Di Carlo Z. Doležal S. Eidelman H. Farhat J. E. Fast T. Ferber A. Frey B. G. Fulsom V. Gaur N. Gabyshev A. Garmash R. Gillard P. Goldenzweig T. Hara H. Hayashii M. T. Hedges W.-S. Hou T. Iijima K. Inami G. Inguglia A. Ishikawa R. Itoh Y. Iwasaki H. B. Jeon Y. Jin D. Joffe K. K. Joo K. H. Kang G. Karyan D. Y. Kim J. B. Kim K. T. Kim M. J. Kim Y. J. Kim K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan P. Krokovny R. Kulasiri I. S. Lee Y. Li L. Li Gioi J. Libby D. Liventsev M. Lubej T. Luo M. Masuda T. Matsuda D. Matvienko K. Miyabayashi H. Miyata H. K. Moon T. Mori E. Nakano M. Nakao T. Nanut K. J. Nath M. Nayak S. Nishida S. Ogawa S. Okuno H. Ono B. Pal C.-S. Park C. W. Park H. Park T. K. Pedlar R. Pestotnik L. E. Piilonen M. Ritter Y. Sakai M. Salehi S. Sandilya T. Sanuki O. Schneider G. Schnell C. Schwanda Y. Seino K. Senyo O. Seon M. E. Sevior V. Shebalin T.-A. Shibata J.-G. Shiu F. Simon E. Solovieva M. Starič T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida F. Tenchini M. Uchida T. Uglov Y. Unno S. Uno Y. Usov C. Van Hulse G. Varner K. E. Varvell A. Vinokurova V. Vorobyev C. H. Wang M.-Z. Wang P. Wang Y. Watanabe E. Widmann E. Won Y. Yamashita H. Ye J. Yelton Y. Yook Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov A. Zupanc II. Physikalisches Institut Georg-August-Universität Göttingen 37073 Göttingen University of Bonn 53115 Bonn School of Physics University of Melbourne Victoria 3010 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 Pacific Northwest National Laboratory Richland Washington 99352 Moscow Institute of Physics and Technology Moscow Region 141700 Tata Institute of Fundamental Research Mumbai 400005 King Abdulaziz City for Science and Technology Riyadh 11442 School of Physics University of Sydney New South Wales 2006 Indian Institute of Technology Madras Chennai 600036 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 University of Hawaii Honolulu Hawaii 96822 Faculty of Mathematics and Physics Charles University 121 16 Prague National Central University Chung-li 32054 Hanyang University Seoul 133-791 P. N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Moscow Physical Engineering Institute Moscow 115409 Korea Institute of Science and Technology Information Daejeon 305-806 Gyeongsang National University Chinju 660-701 Sungkyunkwan University Suwon 440-746 Wayne State University Detroit Michigan 48202 Indian Institute of Technology Bhubaneswar Satya Nagar 751007 Deutsches Elektronen–Synchrotron 22607 Hamburg Institut für Experimentelle Kernphysik 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 Nara Women’s University Nara 630-8506 Department of Physics National Taiwan University Taipei 10617 Kobayashi-Maskawa Institute Nagoya University Nagoya 464-8602 Graduate Sch

We report branching fraction measurements of the decays B+→ηℓ+νℓ and B+→η′ℓ+νℓ based on 711 fb−1 of data collected near the ϒ(4S) resonance with the Belle experiment at the KEKB asymmetric-energy e+e− collider. This data sample contains 772 million BB¯ events. One of the two B mesons is fully reconstructed in a hadronic decay mode. Among the remaining (“signal-B”) daughters, we search for the η meson in two decay channels, η→γγ and η→π+π−π0, and reconstruct the η′ meson in η′→ηπ+π− with subsequent decay of the η into γγ. Combining the two η modes and using an extended maximum likelihood, the B+→ηℓ+νℓ branching fraction is measured to be (4.2±1.1(stat.)±0.3(syst.))×10−5. For B+→η′ℓ+νℓ, we observe no significant signal and set an upper limit of 0.72×10−4 at 90% confidence level.

关键词： Branching fraction Leptonic, semileptonic & radiative decays Particle decays Bottom mesons Leptons Light mesons Lepton colliders Precision measurements

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Search for D0 decays to invisible final states at Belle

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Physical Review D 2017年第1期95卷 011102(R)-011102(R)页

作者： Y.-T. Lai M.-Z. Wang I. Adachi H. Aihara S. Al Said D. M. Asner T. Aushev R. Ayad I. Badhrees A. M. Bakich V. Bansal E. Barberio M. Berger V. Bhardwaj B. Bhuyan J. Biswal A. Bobrov A. Bozek M. Bračko D. Červenkov P. Chang A. Chen B. G. Cheon K. Chilikin R. Chistov K. Cho V. Chobanova Y. Choi D. Cinabro N. Dash S. Di Carlo Z. Doležal D. Dutta S. Eidelman D. Epifanov H. Farhat J. E. Fast T. Ferber B. G. Fulsom V. Gaur N. Gabyshev A. Garmash R. Gillard P. Goldenzweig B. Golob K. Hayasaka W.-S. Hou C.-L. Hsu T. Iijima K. Inami G. Inguglia A. Ishikawa R. Itoh Y. Iwasaki W. W. Jacobs I. Jaegle H. B. Jeon D. Joffe K. K. Joo T. Julius K. H. Kang T. Kawasaki D. Y. Kim J. B. Kim K. T. Kim M. J. Kim S. H. Kim Y. J. Kim K. Kinoshita P. Kodyš D. Kotchetkov P. Krokovny T. Kuhr R. Kulasiri Y.-J. Kwon J. S. Lange I. S. Lee C. H. Li L. Li Y. Li L. Li Gioi J. Libby D. Liventsev M. Masuda T. Matsuda D. Matvienko K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty S. Mohanty E. Nakano M. Nakao H. Nakazawa T. Nanut K. J. Nath Z. Natkaniec M. Nayak S. Nishida S. Ogawa S. Okuno P. Pakhlov B. Pal H. Park S. Paul T. K. Pedlar L. E. Piilonen C. Pulvermacher J. Rauch M. Ritter H. Sahoo Y. Sakai S. Sandilya Y. Sato V. Savinov T. Schlüter O. Schneider G. Schnell C. Schwanda A. J. Schwartz Y. Seino D. Semmler K. Senyo I. S. Seong V. Shebalin C. P. Shen T.-A. Shibata J.-G. Shiu F. Simon E. Solovieva M. Starič J. Stypula T. Sumiyoshi M. Takizawa U. Tamponi F. Tenchini K. Trabelsi M. Uchida S. Uehara T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov C. Van Hulse G. Varner K. E. Varvell V. Vorobyev C. H. Wang M. Watanabe Y. Watanabe E. Widmann E. Won Y. Yamashita H. Ye Y. Yook C. Z. Yuan Y. Yusa Z. P. Zhang V. Zhilich V. Zhulanov A. Zupanc Department of Physics National Taiwan University Taipei 10617 High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 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 Pacific Northwest National Laboratory Richland Washington 99352 Moscow Institute of Physics and Technology Moscow Region 141700 King Abdulaziz City for Science and Technology Riyadh 11442 School of Physics University of Sydney New South Wales 2006 School of Physics University of Melbourne Victoria 3010 Stefan Meyer Institute for Subatomic Physics Vienna 1090 Indian Institute of Science Education and Research Mohali SAS Nagar 140306 Indian Institute of Technology Guwahati Assam 781039 J. Stefan Institute 1000 Ljubljana Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 University of Maribor 2000 Maribor Faculty of Mathematics and Physics Charles University 121 16 Prague National Central University Chung-li 32054 Hanyang University Seoul 133-791 P.N. Lebedev Physical Institute of the Russian Academy of Sciences Moscow 119991 Moscow Physical Engineering Institute Moscow 115409 Korea Institute of Science and Technology Information Daejeon 305-806 Max-Planck-Institut für Physik 80805 München Sungkyunkwan University Suwon 440-746 Wayne State University Detroit Michigan 48202 Indian Institute of Technology Bhubaneswar Satya Nagar 751007 Tata Institute of Fundamental Research Mumbai 400005 Deutsches Elektronen–Synchrotron 22607 Hamburg Institut für Experimentelle Kernphysik Karlsruher Institut für Technologie 76131 Karlsruhe Faculty of Mathematics and Physics University of Ljubljana 1000 Ljubljana Niigata University Niigata 950-2181 Kobayashi-Maskawa

We report the result from the first search for D0 decays to invisible final states. The analysis is performed on a data sample of 924 fb−1 collected at and near the ϒ(4S) and ϒ(5S) resonances with the Belle detector at the KEKB asymmetric-energy e+e− collider. The absolute branching fraction is determined using an inclusive D0 sample, obtained by fully reconstructing the rest of the particle system including the other charmed particle. No significant signal yield is observed and an upper limit of 9.4×10−5 is set on the branching fraction of D0 to invisible final states at 90% confidence level.

关键词： Particle decays Charmed mesons

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Measurement of branching fraction and direct CP asymmetry in charmless B+→K+K−π+ decays at Belle

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Physical Review D 2017年第3期96卷 031101(R)-031101(R)页

作者： C.-L. Hsu D. Dossett M. E. Sevior I. Adachi H. Aihara S. Al Said D. M. Asner H. Atmacan V. Aulchenko T. Aushev R. Ayad I. Badhrees A. M. Bakich E. Barberio P. Behera M. Berger V. Bhardwaj B. Bhuyan J. Biswal T. Bloomfield A. Bondar G. Bonvicini A. Bozek M. Bračko T. E. Browder P. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin R. Chistov K. Cho Y. Choi D. Cinabro N. Dash S. Di Carlo Z. Doležal Z. Drásal S. Eidelman H. Farhat J. E. Fast B. G. Fulsom V. Gaur N. Gabyshev A. Garmash P. Goldenzweig B. Golob O. Grzymkowska E. Guido J. Haba T. Hara K. Hayasaka H. Hayashii M. T. Hedges W.-S. Hou K. Inami G. Inguglia A. Ishikawa W. W. Jacobs I. Jaegle H. B. Jeon Y. Jin D. Joffe K. K. Joo T. Julius A. B. Kaliyar K. H. Kang P. Katrenko T. Kawasaki C. Kiesling D. Y. Kim H. J. Kim J. B. Kim K. T. Kim M. J. Kim S. H. Kim P. Kodyš S. Korpar D. Kotchetkov P. Križan P. Krokovny T. Kuhr R. Kulasiri A. Kuzmin Y.-J. Kwon Y.-T. Lai J. S. Lange C. H. Li L. Li L. Li Gioi J. Libby D. Liventsev M. Lubej T. Luo M. Masuda T. Matsuda D. Matvienko K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty T. Mori R. Mussa E. Nakano M. Nakao T. Nanut K. J. Nath Z. Natkaniec M. Nayak N. K. Nisar S. Nishida S. Ogawa S. Okuno H. Ono Y. Onuki G. Pakhlova B. Pal C.-S. Park C. W. Park H. Park S. Paul T. K. Pedlar L. Pesántez L. E. Piilonen M. Ritter A. Rostomyan Y. Sakai S. Sandilya T. Sanuki Y. Sato V. Savinov O. Schneider G. Schnell C. Schwanda Y. Seino K. Senyo V. Shebalin T.-A. Shibata J.-G. Shiu B. Shwartz F. Simon E. Solovieva M. Starič J. F. Strube K. Sumisawa M. Takahashi M. Takizawa F. Tenchini M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov C. Van Hulse G. Varner K. E. Varvell V. Vorobyev E. Waheed C. H. Wang M.-Z. Wang X.-L. Wang M. Watanabe Y. Watanabe E. Widmann K. M. Williams E. Won Y. Yamashita H. Ye Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov A. Zupanc School of Physics University of Melbourne Victoria 3010 High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 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 Pacific Northwest National Laboratory Richland Washington 99352 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 King Abdulaziz City for Science and Technology Riyadh 11442 School of Physics University of Sydney New South Wales 2006 Indian Institute of Technology Madras Chennai 600036 Stefan Meyer Institute for Subatomic Physics Vienna 1090 Indian Institute of Science Education and Research Mohali SAS Nagar 140306 Indian Institute of Technology Guwahati Assam 781039 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 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 Moscow Physical Engineering Institute Moscow 115409 Korea Institute of Science and Technology Information Daejeon 305-806 Sungkyunkwan University Suwon 440-746 Indian Institute of Technology Bhubaneswar Satya Nagar 751007 Faculty of Mathematics and Physics Charles University 121 16 Prague Tata Institute of Fundamental Research Mumbai 400005 Institut für Experimentelle Kernphysik Karlsruher Institut für Technologie 76131 Karlsruhe Faculty of Mathema

We report a study of the charmless hadronic decay of the charged B meson to the three-body final state K+K−π+. The results are based on a data sample that contains 772×106 BB¯ pairs collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. The measured inclusive branching fraction and direct CP asymmetry are (5.38±0.40±0.35)×10−6 and −0.170±0.073±0.017, respectively, where the first uncertainties are statistical and the second are systematic. The K+K− invariant mass distribution of the signal candidates shows an excess in the region below 1.5 GeV/c2, which is consistent with the previous studies from BABAR and LHCb. In addition, strong evidence of a large direct CP asymmetry is found in the low K+K− invariant-mass region.

关键词： Branching fraction Hadronic decays Rare decays

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Mobile security education on portable labs

Mobile security education on portable labs

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Frontiers in Education (FIE) Conference

作者： Chia-Tien Lo Dan Kai Qian Wei Chen Computer Science and Software Engineering Southern Polytechnic State University Marietta GA USA College of Engineering Tennessee State University Nashville TN USA

Mobile computing has become extremely popular in our daily lives [1] and hence it is an important platform for software developers. Mobile platforms enable students to learn in a modern context when they are used as teaching tools in Computer Science (CS) or Information technology (IT) education. Meanwhile, mobile security is an important topic in security curricula partly due to the popularity of consumer mobile devices and a shift in computing landscape towards mobile devices' apps development. Due to the rapid demand and popularity of mobile devices [2-3], the security of mobile computing is vital to the growing army of users and for the future of our social, economic and political systems. Hence, it is important and needed to develop hands-on learning materials on mobile security that produce a well-educated and trained workforce, who understands the many concerns of security, privacy, integrity and reliability, and is able to develop strong protection mechanisms and apply fundamental principles and best practices in solving real world problems [4-6]. Many colleges and universities are developing and offering courses on mobile programming and development. However, pedagogical materials based on real world applications running on a portable isolated network are still in infant stage.

关键词： Security Mobile communication Programming Education Mobile handsets Communication networks

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Invariant-mass and fractional-energy dependence of inclusive production of dihadrons in e+e− annihilation at s=10.58 GeV

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Physical Review D 2017年第3期96卷 032005-032005页

作者： R. Seidl I. Adachi H. Aihara S. Al Said D. M. Asner T. Aushev R. Ayad I. Badhrees A. M. Bakich V. Bansal P. Behera V. Bhardwaj B. Bhuyan J. Biswal A. Bobrov A. Bozek M. Bračko T. E. Browder D. Červenkov V. Chekelian A. Chen B. G. Cheon K. Chilikin K. Cho S.-K. Choi Y. Choi D. Cinabro N. Dash S. Di Carlo Z. Doležal Z. Drásal S. Eidelman H. Farhat J. E. Fast T. Ferber B. G. Fulsom V. Gaur N. Gabyshev A. Garmash R. Gillard P. Goldenzweig E. Guido J. Haba K. Hayasaka H. Hayashii W.-S. Hou T. Iijima K. Inami A. Ishikawa R. Itoh Y. Iwasaki W. W. Jacobs I. Jaegle H. B. Jeon S. Jia Y. Jin D. Joffe K. K. Joo T. Julius K. H. Kang G. Karyan D. Y. Kim J. B. Kim K. T. Kim M. J. Kim S. H. Kim Y. J. Kim K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan P. Krokovny R. Kulasiri T. Kumita A. Kuzmin Y.-J. Kwon J. S. Lange L. Li L. Li Gioi J. Libby D. Liventsev M. Lubej T. Luo M. Masuda T. Matsuda D. Matvienko M. Merola K. Miyabayashi H. Miyata R. Mizuk H. K. Moon T. Mori R. Mussa E. Nakano M. Nakao T. Nanut K. J. Nath Z. Natkaniec M. Niiyama N. K. Nisar S. Nishida S. Ogawa H. Ono P. Pakhlov G. Pakhlova B. Pal S. Pardi H. Park S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen C. Pulvermacher M. Ritter A. Rostomyan Y. Sakai L. Santelj V. Savinov O. Schneider G. Schnell C. Schwanda Y. Seino K. Senyo M. E. Sevior V. Shebalin C. P. Shen T.-A. Shibata J.-G. Shiu B. Shwartz F. Simon A. Sokolov E. Solovieva M. Starič J. F. Strube K. Sumisawa T. Sumiyoshi M. Takizawa U. Tamponi K. Tanida F. Tenchini M. Uchida T. Uglov Y. Unno S. Uno C. Van Hulse G. Varner V. Vorobyev A. Vossen C. H. Wang P. Wang M. Watanabe Y. Watanabe S. Watanuki E. Widmann E. Won Y. Yamashita H. Ye Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov A. Zupanc RIKEN BNL Research Center Upton New York 11973 High Energy Accelerator Research Organization (KEK) Tsukuba 305-0801 SOKENDAI (The Graduate University for Advanced Studies) Hayama 240-0193 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 Pacific Northwest National Laboratory Richland Washington 99352 Moscow Institute of Physics and Technology Moscow Region 141700 King Abdulaziz City for Science and Technology Riyadh 11442 School of Physics University of Sydney New South Wales 2006 Indian Institute of Technology Madras Chennai 600036 Indian Institute of Science Education and Research Mohali SAS Nagar Punjab 140306 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 H. Niewodniczanski Institute of Nuclear Physics Krakow 31-342 University of Maribor 2000 Maribor University of Hawaii Honolulu Hawaii 96822 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 Moscow Physical Engineering Institute Moscow 115409 Korea Institute of Science and Technology Information Daejeon 305-806 Gyeongsang National University Chinju 660-701 Sungkyunkwan University Suwon 440-746 Wayne State University Detroit Michigan 48202 Indian Institute of Technology Bhubaneswar Satya Nagar 751007 Deutsches Elektronen–Synchrotron 22607 Hamburg Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 Institut für Experimentelle Kernphysik Karlsruher Institut für Technologie 76131 Karlsruhe INFN—Sezione di Torino 10125 Torino Niigata University Niigata 950-2181 Nara Wom

The inclusive cross sections for dihadrons of charged pions and kaons (e+e−→hhX) in electron-positron annihilation are reported. They are obtained as a function of the total fractional energy and invariant mass for any di-hadron combination in the same hemisphere as defined by the thrust event-shape variable and its axis. Since same-hemisphere dihadrons can be assumed to originate predominantly from the same initial parton, di-hadron fragmentation functions are probed. These di-hadron fragmentation functions are needed as an unpolarized baseline in order to quantitatively understand related spin-dependent measurements in other processes and to apply them to the extraction of quark transversity distribution functions in the nucleon. The di-hadron cross sections are obtained from a 655 fb−1 data sample collected at or near the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider.

关键词： Fragmentation into hadrons Light mesons Lepton colliders

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Study of η and dipion transitions in ϒ(4S) decays to lower bottomonia

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Physical Review D 2017年第5期96卷 052005-052005页

作者： E. Guido R. Mussa U. Tamponi I. Adachi H. Aihara S. Al Said D. M. Asner V. Aulchenko T. Aushev R. Ayad I. Badhrees A. M. Bakich V. Bansal P. Behera V. Bhardwaj B. Bhuyan J. Biswal A. Bobrov A. Bondar A. Bozek M. Bračko T. E. Browder D. Červenkov V. Chekelian A. Chen B. G. Cheon K. Chilikin K. Cho S.-K. Choi Y. Choi D. Cinabro N. Dash S. Di Carlo Z. Doležal Z. Drásal S. Eidelman D. Epifanov H. Farhat J. E. Fast T. Ferber B. G. Fulsom V. Gaur N. Gabyshev A. Garmash M. Gelb R. Gillard P. Goldenzweig J. Haba T. Hara K. Hayasaka H. Hayashii M. T. Hedges W.-S. Hou T. Iijima K. Inami G. Inguglia A. Ishikawa R. Itoh Y. Iwasaki W. W. Jacobs I. Jaegle H. B. Jeon S. Jia Y. Jin D. Joffe K. K. Joo T. Julius K. H. Kang G. Karyan T. Kawasaki D. Y. Kim J. B. Kim K. T. Kim M. J. Kim S. H. Kim Y. J. Kim K. Kinoshita P. Kodyš S. Korpar D. Kotchetkov P. Križan P. Krokovny R. Kulasiri T. Kumita A. Kuzmin Y.-J. Kwon J. S. Lange P. Lewis C. H. Li L. Li L. Li Gioi J. Libby D. Liventsev M. Lubej T. Luo M. Masuda T. Matsuda D. Matvienko M. Merola K. Miyabayashi H. Miyata R. Mizuk H. K. Moon T. Mori E. Nakano M. Nakao T. Nanut K. J. Nath Z. Natkaniec M. Nayak M. Niiyama N. K. Nisar S. Nishida S. Ogawa H. Ono P. Pakhlov G. Pakhlova B. Pal S. Pardi C.-S. Park H. Park S. Paul T. K. Pedlar R. Pestotnik L. E. Piilonen C. Pulvermacher M. Ritter A. Rostomyan Y. Sakai S. Sandilya L. Santelj T. Sanuki V. Savinov O. Schneider G. Schnell C. Schwanda Y. Seino K. Senyo M. E. Sevior V. Shebalin C. P. Shen T.-A. Shibata J.-G. Shiu B. Shwartz F. Simon A. Sokolov E. Solovieva M. Starič J. F. Strube K. Sumisawa T. Sumiyoshi M. Takizawa K. Tanida F. Tenchini K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno Y. Usov C. Van Hulse G. Varner A. Vinokurova V. Vorobyev A. Vossen C. H. Wang P. Wang X. L. Wang M. Watanabe Y. Watanabe S. Watanuki E. Widmann K. M. Williams E. Won Y. Yamashita H. Ye C. Z. Yuan Z. P. Zhang V. Zhilich V. Zhukova V. Zhulanov A. Zupanc INFN—Sezione di Torino 10125 Torino University of Torino 10124 Torino 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 Pacific Northwest National Laboratory Richland Washington 99352 Budker Institute of Nuclear Physics SB RAS Novosibirsk 630090 Novosibirsk State University Novosibirsk 630090 Moscow Institute of Physics and Technology Moscow Region 141700 King Abdulaziz City for Science and Technology Riyadh 11442 School of Physics University of Sydney New South Wales 2006 Indian Institute of Technology Madras Chennai 600036 Indian Institute of Science Education and Research Mohali SAS Nagar Punjab 140306 Indian Institute of Technology Guwahati Assam 781039 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 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 Moscow Physical Engineering Institute Moscow 115409 Korea Institute of Science and Technology Information Daejeon 305-806 Gyeongsang National University Chinju 660-701 Sungkyunkwan University Suwon 440-746 Wayne State University Detroit Michigan 48202 Indian Institute of Technology Bhubaneswar Satya Nagar 751007 Deutsches Elektronen–Synchrotron 22607 Hamburg Virginia Polytechnic Institute and State University Blacksburg Virginia 24061 Institut für Experimentelle Kernphysik Karlsruher Institut für Technologie 76131 Karlsruhe Niigata University Niigata 950-2181 Nara Women’s Universit

We study hadronic transitions between bottomonium states using 496 fb−1 data collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e− collider. We measure B(ϒ(4S)→π+π−ϒ(1S))=(8.2±0.5(stat)±0.4(syst))×10−5, B(ϒ(4S)→π+π−ϒ(2S))=(7.9±1.0(stat)±0.4(syst))×10−5, and B(ϒ(4S)→ηϒ(1S))=(1.70±0.23(stat)±0.08(syst))×10−4. We measure the ratio of branching fractions R=B(ϒ(4S)→ηϒ(1S))/B(ϒ(4S)→π+π−ϒ(1S))=2.07±0.30(stat)±0.11(syst). We search for the decay ϒ(1D31,2)→ηϒ(1S), but do not find significant evidence for such a transition. We also measure the initial-state radiation production cross sections of the ϒ(2S,3S) resonances and we find values compatible with the expected ones. Finally, the analysis of the ϒ(4S)→π+π−ϒ(1S) events shows indications for a resonant contribution due to the f0(980) meson.

关键词： Particle decays

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