检索结果-内蒙古大学图书馆

arXiv 2019年

作者： Ablikim, M. Achasov, M.N. Ahmed, S. Albrecht, M. Alekseev, M. Amoroso, A. An, F.F. An, Q. Bai, Y. Bakina, O. Ferroli, R. Baldini Ban, Y. Begzsuren, K. Bennett, D.W. Bennett, J.V. Berger, N. Bertani, M. Bettoni, D. Bianchi, F. Boger, E. Boyko, I. Briere, R.A. Cai, H. Cai, X. Calcaterra, A. Cao, G.F. Cetin, S.A. Chai, J. Chang, J.F. Chang, W.L. Chelkov, G. Chen, G. Chen, H.S. Chen, J.C. Chen, M.L. Chen, S.J. Chen, X.R. Chen, Y.B. Cheng, W. Chu, X.K. Cibinetto, G. Cossio, F. Dai, H.L. Dai, J.P. Dbeyssi, A. Dedovich, D. Deng, Z.Y. Denig, A. Denysenko, I. Destefanis, M. Mori, F. De Ding, Y. Dong, C. Dong, J. Dong, L.Y. Dong, M.Y. Dou, Z.L. Du, S.X. Fan, J.Z. Fang, J. Fang, S.S. Fang, Y. Farinelli, R. Fava, L. Feldbauer, F. Felici, G. Feng, C.Q. Fritsch, M. Fu, C.D. Gao, Q. Gao, X.L. Gao, Y. Gao, Y.G. Gao, Z. Garillon, B. Garzia, I. Gilman, A. Goetzen, K. Gong, L. Gong, W.X. Gradl, W. Greco, M. Gu, L.M. Gu, M.H. Gu, Y.T. Guo, A.Q. Guo, L.B. Guo, R.P. Guo, Y.P. Guskov, A. Han, S. Hao, X.Q. Harris, F.A. He, K.L. Heinsius, F.H. Held, T. Heng, Y.K. Hou, Z.L. Hu, H.M. Hu, J.F. Hu, T. Hu, Y. Huang, G.S. Huang, J.S. Huang, X.T. Huang, X.Z. Huang, Z.L. Hussain, T. Hsken, N. Andersson, W. Ikegami Imoehl, W. Irshad, M. Ji, Q. Ji, Q.P. Ji, X.B. Ji, X.L. Jiang, H.L. Jiang, X.S. Jiang, X.Y. Jiao, J.B. Jiao, Z. Jin, D.P. Jin, S. Jin, Y. Johansson, T. Kalantar-Nayestanaki, N. Kang, X.S. Kavatsyuk, M. Ke, B.C. Keshk, I.K. Khan, T. Khoukaz, A. Kiese, P. Kiuchi, R. Kliemt, R. Koch, L. Kolcu, O.B. Kopf, B. Kuemmel, M. Kuessner, M. Kupsc, A. Kurth, M. Kühn, W. Lange, J.S. Larin, P. Lavezzi, L. Leiber, S. Leithoff, H. Li, C. Li, Cheng Li, D.M. Li, F. Li, F.Y. Li, G. Li, H.B. Li, H.J. Li, J.C. Li, J.W. Li, K.J. Li, Kang Li, Ke Li, L.K. Li, Lei Li, P.L. Li, P.R. Li, Q.Y. Li, W.D. Li, W.G. Li, X.L. Institute of High Energy Physics Beijing100049 China Beihang University Beijing100191 China Beijing Institute of Petrochemical Technology Beijing102617 China Bochum Ruhr-University BochumD-44780 Germany Carnegie Mellon University PittsburghPA15213 United States Central China Normal University Wuhan430079 China China Center of Advanced Science and Technology Beijing100190 China COMSATS Institute of Information Technology Lahore Defence Road Off Raiwind Road Lahore54000 Pakistan Fudan University Shanghai200443 China Novosibirsk630090 Russia GSI Helmholtzcentre for Heavy Ion Research GmbH DarmstadtD-64291 Germany Guangxi Normal University Guilin541004 China Guangxi University Nanning530004 China Hangzhou Normal University Hangzhou310036 China Helmholtz Institute Mainz Johann-Joachim-Becher-Weg 45 MainzD-55099 Germany Henan Normal University Xinxiang453007 China Henan University of Science and Technology Luoyang471003 China Huangshan College Huangshan245000 China Hunan Normal University Changsha410081 China Hunan University Changsha410082 China Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47405 United States INFN Laboratori Nazionali di Frascati FrascatiI-00044 Italy INFN and University of Perugia PerugiaI-06100 Italy INFN Sezione di Ferrara FerraraI-44122 Italy University of Ferrara FerraraI-44122 Italy Institute of Physics and Technology Peace Ave. 54B Ulaanbaatar13330 Mongolia Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 MainzD-55099 Germany Joint Institute for Nuclear Research Dubna Moscow region141980 Russia Justus-Liebig-Universitaet Giessen II. Physikalisches Institut Heinrich-Buff-Ring 16 GiessenD-35392 Germany KVI-CART University of Groningen GroningenNL-9747 AA Netherlands Lanzhou University Lanzhou730000 China Liaoning University Shenyang110036 China Nanjing Normal University Nanjing210023 China Nanjing University Nanjing210

Using a sample of (1310.6 ± 7.0) × 106 J/ψ events recorded with the BESIII detector at the symmetric electron positron collider BEPCII, we report the observation of the decay of the (11S0) charmonium state ηc into a pair of ω mesons in the process J/ψ → γωω. The branching fraction is measured for the first time to be B(ηc → ωω) = (2.88 ± 0.10 ± 0.46 ± 0.68) × 10−3, where the first uncertainty is statistical, the second systematic and the third is from the uncertainty of B(J/ψ → γηc). The mass and width of the ηc are determined as M = (2985.9 ± 0.7 ± 2.1) MeV/c2 and Γ = (33.8 ± 1.6 ± 4.1) MeV. Copyright © 2019, The Authors. All rights reserved.

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Measurement of branching fractions for ψ(3686) → γη′, γη and γπ0

arXiv

引用

arXiv 2017年

作者： Ablikim, M. Achasov, M.N. Ahmed, S. Albrecht, M. Alekseev, M. Amoroso, A. An, F.F. An, Q. Bai, J.Z. Bai, Y. Bakina, O. Baldini Ferroli, R. Ban, Y. Bennett, D.W. Bennett, J.V. Berger, N. Bertani, M. Bettoni, D. Bianchi, F. Boger, E. Boyko, I. Briere, R.A. Cai, H. Cai, X. Cakir, O. Calcaterra, A. Cao, G.F. Cetin, S.A. Chang, J.F. Chelkov, G. Chen, G. Chen, H.S. Chen, J.C. Chen, M.L. Chen, S.J. Chen, X.R. Chen, Y.B. Chu, X.K. Cibinetto, G. Dai, H.L. Dai, J.P. Dbeyssi, A. Dedovich, D. Deng, Z.Y. Denig, A. Denysenko, I. Destefanis, M. de Mori, F. Ding, Y. Dong, C. Dong, J. Dong, L.Y. Dong, M.Y. Dorjkhaidav, O. Dou, Z.L. Du, S.X. Duan, P.F. Fang, J. Fang, S.S. Fang, Y. Farinelli, R. Fava, L. Fegan, S. Feldbauer, F. Felici, G. Feng, C.Q. Fioravanti, E. Fritsch, M. Fu, C.D. Gao, Q. Gao, X.L. Gao, Y. Gao, Y.G. Gao, Z. Garillon, B. Garzia, I. Goetzen, K. Gong, L. Gong, W.X. Gradl, W. Greco, M. Gu, M.H. Gu, S. Gu, Y.T. Guo, A.Q. Guo, R.P. Guo, Y.P. Guskov, A. Haddadi, Z. Han, S. Hao, X.Q. Harris, F.A. He, K.L. He, X.Q. Heinsius, F.H. Held, T. Heng, Y.K. Holtmann, T. Hou, Z.L. Hu, H.M. Hu, J.F. Hu, T. Hu, Y. Huang, G.S. Huang, J.S. Huang, S.H. Huang, X.T. Huang, X.Z. Huang, Z.L. Hussain, T. Ikegami, W. Andersson Ji, Q. Ji, Q.P. Ji, X.B. Ji, X.L. Jiang, X.S. Jiang, X.Y. Jiao, J.B. Jiao, Z. Jin, D.P. Jin, S. Jin, Y. Johansson, T. Julin, A. Kalantar-Nayestanaki, N. Kang, X.S. Kavatsyuk, M. Ke, B.C. Khan, T. Khoukaz, A. Kiese, P. Kliemt, R. Koch, L. Kolcu, O.B. Kopf, B. Kornicer, M. Kuemmel, M. Kuhlmann, M. Kupsc, A. Kühn, W. Lange, J.S. Lara, M. Larin, P. Lavezzi, L. Leithoff, H. Leng, C. Li, C. Li, Cheng Li, D.M. Li, F. Li, F.Y. Li, G. Li, H.B. Li, H.J. Li, J.C. Li, Jin Li, K.J. Li, Kang Li, Ke Li, Lei Li, P.L. Li, P.R. Li, Q.Y. Li, W.D. Li, W.G. Li, X.L. Li, X.N. Li, X.Q. Li, Z.B. Institute of High Energy Physics Beijing100049 China Beihang University Beijing100191 China Beijing Institute of Petrochemical Technology Beijing102617 China Bochum Ruhr-University BochumD-44780 Germany Carnegie Mellon University PittsburghPA15213 United States Central China Normal University Wuhan430079 China China Center of Advanced Science and Technology Beijing100190 China COMSATS Institute of Information Technology Lahore Defence Road Off Raiwind Road Lahore54000 Pakistan Novosibirsk630090 Russia GSI Helmholtzcentre for Heavy Ion Research GmbH DarmstadtD-64291 Germany Guangxi Normal University Guilin541004 China Guangxi University Nanning530004 China Hangzhou Normal University Hangzhou310036 China Helmholtz Institute Mainz Johann-Joachim-Becher-Weg 45 MainzD-55099 Germany Henan Normal University Xinxiang453007 China Henan University of Science and Technology Luoyang471003 China Huangshan College Huangshan245000 China Hunan University Changsha410082 China Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47405 United States INFN Laboratori Nazionali di Frascati FrascatiI-00044 Italy INFN and University of Perugia PerugiaI-06100 Italy INFN Sezione di Ferrara FerraraI-44122 Italy University of Ferrara FerraraI-44122 Italy Institute of Physics and Technology Peace Ave. 54B Ulaanbaatar13330 Mongolia Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 MainzD-55099 Germany Joint Institute for Nuclear Research Dubna Moscow region141980 Russia Justus-Liebig-Universitaet Giessen II. Physikalisches Institut Heinrich-Buff-Ring 16 GiessenD-35392 Germany KVI-CART University of Groningen GroningenNL-9747 AA Netherlands Lanzhou University Lanzhou730000 China Liaoning University Shenyang110036 China Nanjing Normal University Nanjing210023 China Nanjing University Nanjing210093 China Nankai University Tianjin300071 China Peking University Beijing100871 Ch

Using a data sample of 448 × 106 ψ(3686) events collected with the BESIII detector operating at the BEPCII storage ring, the decays ψ(3686) → γη and ψ(3686) → γπ0 are observed with a statistical significance of 7.3σ and 6.7σ, respectively. The branching fractions are measured to be B(ψ(3686) → γη) = (0.85 ± 0.18 ± 0.05) × 10−6 and B(ψ(3686) → γπ0) = (0.95 ± 0.16 ± 0.05) × 10−6. In addition, we measure the branching fraction of ψ(3686) → γη′ to be B(ψ(3686) → γη′) = (125.1 ± 2.2 ± 6.2) × 10−6, with improved precision compared to previous results. Copyright © 2017, The Authors. All rights reserved.

关键词： Digital storage

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Search for invisible decays of ω and φ with J/ψ data at BESIII

arXiv

引用

arXiv 2018年

作者： Ablikim, M. Achasov, M.N. Ahmed, S. Albrecht, M. Alekseev, M. Amoroso, A. An, F.F. An, Q. Bai, Y. Bakina, O. Baldini Ferroli, R. Ban, Y. Begzsuren, K. Bennett, D.W. Bennett, J.V. Berger, N. Bertani, M. Bettoni, D. Bianchi, F. Boger, E. Boyko, I. Briere, R.A. Cai, H. Cai, X. Calcaterra, A. Cao, G.F. Cetin, S.A. Chai, J. Chang, J.F. Chang, W.L. Chelkov, G. Chen, G. Chen, H.S. Chen, J.C. Chen, M.L. Chen, P.L. Chen, S.J. Chen, X.R. Chen, Y.B. Cheng, W. Chu, X.K. Cibinetto, G. Cossio, F. Dai, H.L. Dai, J.P. Dbeyssi, A. Dedovich, D. Deng, Z.Y. Denig, A. Denysenko, I. Destefanis, M. de Mori, F. Ding, Y. Dong, C. Dong, J. Dong, L.Y. Dong, M.Y. Dou, Z.L. Du, S.X. Duan, P.F. Fang, J. Fang, S.S. Fang, Y. Farinelli, R. Fava, L. Fegan, S. Feldbauer, F. Felici, G. Feng, C.Q. Fioravanti, E. Fritsch, M. Fu, C.D. Gao, Q. Gao, X.L. Gao, Y. Gao, Y.G. Gao, Z. Garillon, B. Garzia, I. Gilman, A. Goetzen, K. Gong, L. Gong, W.X. Gradl, W. Greco, M. Gu, L.M. Gu, M.H. Gu, Y.T. Guo, A.Q. Guo, L.B. Guo, R.P. Guo, Y.P. Guskov, A. Haddadi, Z. Han, S. Hao, X.Q. Harris, F.A. He, K.L. He, X.Q. Heinsius, F.H. Held, T. Heng, Y.K. Hou, Z.L. Hu, H.M. Hu, J.F. Hu, T. Hu, Y. Huang, G.S. Huang, J.S. Huang, X.T. Huang, X.Z. Huang, Z.L. Hussain, T. Ikegami Andersson, W. Irshad, M. Ji, Q. Ji, Q.P. Ji, X.B. Ji, X.L. Jiang, X.S. Jiang, X.Y. Jiao, J.B. Jiao, Z. Jin, D.P. Jin, S. Jin, Y. Johansson, T. Julin, A. Kalantar-Nayestanaki, N. Kang, X.S. Kavatsyuk, M. Ke, B.C. Keshk, I.K. Khan, T. Khoukaz, A. Kiese, P. Kiuchi, R. Kliemt, R. Koch, L. Kolcu, O.B. Kopf, B. Kornicer, M. Kuemmel, M. Kuessner, M. Kupsc, A. Kurth, M. Kühn, W. Lange, J.S. Larin, P. Lavezzi, L. Leiber, S. Leithoff, H. Li, C. Li, Cheng Li, D.M. Li, F. Li, F.Y. Li, G. Li, H.B. Li, H.J. Li, J.C. Li, J.W. Li, K.J. Li, Kang Li, Ke Li, Lei Li, P.L. Institute of High Energy Physics Beijing100049 China Beihang University Beijing100191 China Beijing Institute of Petrochemical Technology Beijing102617 China Bochum Ruhr-University BochumD-44780 Germany Carnegie Mellon University PittsburghPA15213 United States Central China Normal University Wuhan430079 China China Center of Advanced Science and Technology Beijing100190 China COMSATS Institute of Information Technology Lahore Defence Road Off Raiwind Road Lahore54000 Pakistan Fudan University Shanghai200443 China Novosibirsk630090 Russia GSI Helmholtzcentre for Heavy Ion Research GmbH DarmstadtD-64291 Germany Guangxi Normal University Guilin541004 China Guangxi University Nanning530004 China Hangzhou Normal University Hangzhou310036 China Helmholtz Institute Mainz Johann-Joachim-Becher-Weg 45 MainzD-55099 Germany Henan Normal University Xinxiang453007 China Henan University of Science and Technology Luoyang471003 China Huangshan College Huangshan245000 China Hunan Normal University Changsha410081 China Hunan University Changsha410082 China Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47405 United States INFN Laboratori Nazionali di Frascati FrascatiI-00044 Italy INFN University of Perugia PerugiaI-06100 Italy INFN Sezione di Ferrara FerraraI-44122 Italy University of Ferrara FerraraI-44122 Italy Institute of Physics and Technology Peace Ave. 54B Ulaanbaatar13330 Mongolia Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 MainzD-55099 Germany Joint Institute for Nuclear Research Dubna Moscow region141980 Russia Justus-Liebig-Universitaet Giessen II. Physikalisches Institut Heinrich-Buff-Ring 16 GiessenD-35392 Germany KVI CART University of Groningen AA GroningenNL-9747 Netherlands Lanzhou University Lanzhou730000 China Liaoning University Shenyang110036 China Nanjing Normal University Nanjing210023 China Nanjing University Nanjing21

Using a data sample of (1310.6±7.0)×106 J/ψ events collected with the BESIII detector operating at the BEPCII collider, we perform the first experimental search for invisible decays of a light vector meson (V = ω, φ) via J/ψ → V η decays. The decay of η → π+π−π0 is utilized to tag the V meson decaying into the invisible final state. No evidence for a significant invisible signal is observed, and the upper limits on the ratio of branching fractions at the 90% confidence level are determined to (Equation Presented) By using the world average values of B(ω → π+π−π0) and B(φ → K+K−), the upper limits on the decay branching fractions at the 90% confidence level are set as B(ω → invisible) −5 and B(φ → invisible) −4, respectively. Copyright © 2018, The Authors. All rights reserved.

关键词： Bosons

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Observation of the decays χcJ → φφη

arXiv

引用

arXiv 2019年

作者： Ablikim, M. Achasov, M.N. Adlarson, P. Ahmed, S. Albrecht, M. Alekseev, M. Amoroso, A. An, F.F. An, Q. Bai, Y. Bakina, O. Baldini Ferroli, R. Balossino, I. Ban, Y. Begzsuren, K. Bennett, J.V. Berger, N. Bertani, M. Bettoni, D. Bianchi, F. Biernat, J. Bloms, J. Boyko, I. Briere, R.A. Cai, H. Cai, X. Calcaterra, A. Cao, G.F. Cao, N. Cetin, S.A. Chai, J. Chang, J.F. Chang, W.L. Chelkov, G. Chen, D.Y. Chen, G. Chen, H.S. Chen, J. Chen, M.L. Chen, S.J. Chen, X.R. Chen, Y.B. Cheng, W. Cibinetto, G. Cossio, F. Cui, X.F. Dai, H.L. Dai, J.P. Dai, X.C. Dbeyssi, A. Dedovich, D. Deng, Z.Y. Denig, A. Denysenko, I. Destefanis, M. de Mori, F. Ding, Y. Dong, C. Dong, J. Dong, L.Y. Dong, M.Y. Dou, Z.L. Du, S.X. Fan, J.Z. Fang, J. Fang, S.S. Fang, Y. Farinelli, R. Fava, L. Feldbauer, F. Felici, G. Feng, C.Q. Fritsch, M. Fu, C.D. Fu, Y. Gao, Q. Gao, X.L. Gao, Y. Gao, Y. Gao, Y.G. Garillon, B. Garzia, I. Gersabeck, E.M. Gilman, A. Goetzen, K. Gong, L. Gong, W.X. Gradl, W. Greco, M. Gu, L.M. Gu, M.H. Gu, S. Gu, Y.T. Guo, A.Q. Guo, L.B. Guo, R.P. Guo, Y.P. Guskov, A. Han, S. Hao, X.Q. Harris, F.A. He, K.L. Heinsius, F.H. Held, T. Heng, Y.K. Himmelreich, M. Hou, Y.R. Hou, Z.L. Hu, H.M. Hu, J.F. Hu, T. Hu, Y. Huang, G.S. Huang, J.S. Huang, X.T. Huang, X.Z. Huesken, N. Hussain, T. Ikegami Andersson, W. Imoehl, W. Irshad, M. Ji, Q. Ji, Q.P. Ji, X.B. Ji, X.L. Jiang, H.L. Jiang, X.S. Jiang, X.Y. Jiao, J.B. Jiao, Z. Jin, D.P. Jin, S. Jin, Y. Johansson, T. Kalantar-Nayestanaki, N. Kang, X.S. Kappert, R. Kavatsyuk, M. Ke, B.C. Keshk, I.K. Khoukaz, A. Kiese, P. Kiuchi, R. Kliemt, R. Koch, L. Kolcu, O.B. Kopf, B. Kuemmel, M. Kuessner, M. Kupsc, A. Kurth, M. Kurth, M.G. Kühn, W. Lange, J.S. Larin, P. Lavezzi, L. Leithoff, H. Lenz, T. Li, C. Li, C.H. Li, Cheng Li, D.M. Li, F. Li, G. Li, H.B. Li, H.J. Li, J.C. Li, Ke Institute of High Energy Physics Beijing100049 China Beihang University Beijing100191 China Beijing Institute of Petrochemical Technology Beijing102617 China Bochum Ruhr-University BochumD-44780 Germany Carnegie Mellon University PittsburghPA15213 United States Central China Normal University Wuhan430079 China China Center of Advanced Science and Technology Beijing100190 China COMSATS University Islamabad Lahore Campus Defence Road Off Raiwind Road Lahore54000 Pakistan Fudan University Shanghai200443 China Novosibirsk630090 Russia GSI Helmholtzcentre for Heavy Ion Research GmbH DarmstadtD-64291 Germany Guangxi Normal University Guilin541004 China Guangxi University Nanning530004 China Hangzhou Normal University Hangzhou310036 China Helmholtz Institute Mainz Johann-Joachim-Becher-Weg 45 MainzD-55099 Germany Henan Normal University Xinxiang453007 China Henan University of Science and Technology Luoyang471003 China Huangshan College Huangshan245000 China Hunan Normal University Changsha410081 China Hunan University Changsha410082 China Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47405 United States INFN Laboratori Nazionali di Frascati Italy INFN Sezione di Ferrara FerraraI-44122 Italy Institute of Modern Physics Lanzhou730000 China Institute of Physics and Technology Peace Ave. 54B Ulaanbaatar13330 Mongolia Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 MainzD-55099 Germany Joint Institute for Nuclear Research Dubna Moscow region141980 Russia Justus-Liebig-Universitaet Giessen II. Physikalisches Institut Heinrich-Buff-Ring 16 GiessenD-35392 Germany KVI-CART University of Groningen GroningenNL-9747 AA Netherlands Lanzhou University Lanzhou730000 China Liaoning Normal University Dalian116029 China Liaoning University Shenyang110036 China Nanjing Normal University Nanjing210023 China Nanjing University Nanjing210093 China Nankai Universit

Using a data sample of (448.1 ± 2.9) × 106 ψ(3686) decays collected by the BESIII detector at the Beijing Electron Positron Collider (BEPCII), we observe the decays χcJ → φφη (J = 0, 1, 2), where the χcJ are produced via the radiative processes ψ(3686) → γχcJ. The branching fractions are measured to be B(χc0 → φφη) = (8.41 ± 0.74 ± 0.62) × 10−4, B(χc1 → φφη) = (2.96 ± 0.43 ± 0.22) × 10−4, and B(χc2 → φφη) = (5.33 ± 0.52 ± 0.39) × 10−4, where the first uncertainties are statistical and the second are systematic. We also search for intermediate states in the φφ or ηφ combinations, but no significant structure is seen due to the limited statistics. Copyright © 2019, The Authors. All rights reserved.

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Measurement of the cross section for e+e− → Ξ−Ξ¯+ and observation of an excited Ξ baryon

arXiv

引用

arXiv 2019年

作者： Ablikim, M. Achasov, M.N. Adlarson, P. Ahmed, S. Albrecht, M. Alekseev, M. Amoroso, A. An, F.F. An, Q. Bai, Y. Bakina, O. Baldini Ferroli, R. Balossino, I. Ban, Y. Begzsuren, K. Bennett, J.V. Berger, N. Bertani, M. Bettoni, D. Bianchi, F. Biernat, J. Bloms, J. Boyko, I. Briere, R.A. Cai, H. Cai, X. Calcaterra, A. Cao, G.F. Cao, N. Cetin, S.A. Chai, J. Chang, J.F. Chang, W.L. Chelkov, G. Chen, D.Y. Chen, G. Chen, H.S. Chen, J.C. Chen, M.L. Chen, S.J. Chen, Y.B. Cheng, W. Cibinetto, G. Cossio, F. Cui, X.F. Dai, H.L. Dai, J.P. Dai, X.C. Dbeyssi, A. Dedovich, D. Deng, Z.Y. Denig, A. Denysenko, I. Destefanis, M. de Mori, F. Ding, Y. Dong, C. Dong, J. Dong, L.Y. Dong, M.Y. Dou, Z.L. Du, S.X. Fan, J.Z. Fang, J. Fang, S.S. Fang, Y. Farinelli, R. Fava, L. Feldbauer, F. Felici, G. Feng, C.Q. Fritsch, M. Fu, C.D. Fu, Y. Gao, Q. Gao, X.L. Gao, Y. Gao, Y. Gao, Y.G. Gao, Z. Garillon, B. Garzia, I. Gersabeck, E.M. Gilman, A. Goetzen, K. Gong, L. Gong, W.X. Gradl, W. Greco, M. Gu, L.M. Gu, M.H. Gu, S. Gu, Y.T. Guo, A.Q. Guo, L.B. Guo, R.P. Guo, Y.P. Guskov, A. Han, S. Hao, X.Q. Harris, F.A. He, K.L. Heinsius, F.H. Held, T. Heng, Y.K. Himmelreich, M. Hou, Y.R. Hou, Z.L. Hu, H.M. Hu, J.F. Hu, T. Hu, Y. Huang, G.S. Huang, J.S. Huang, X.T. Huang, X.Z. Huesken, N. Hussain, T. Ikegami Andersson, W. Imoehl, W. Irshad, M. Ji, Q. Ji, Q.P. Ji, X.B. Ji, X.L. Jiang, H.L. Jiang, X.S. Jiang, X.Y. Jiao, J.B. Jiao, Z. Jin, D.P. Jin, S. Jin, Y. Johansson, T. Kalantar-Nayestanaki, N. Kang, X.S. Kappert, R. Kavatsyuk, M. Ke, B.C. Keshk, I.K. Khoukaz, A. Kiese, P. Kiuchi, R. Kliemt, R. Koch, L. Kolcu, O.B. Kopf, B. Kuemmel, M. Kuessner, M. Kupsc, A. Kurth, M. Kurth, M.G. Kühn, W. Lange, J.S. Larin, P. Lavezzi, L. Leithoff, H. Lenz, T. Li, C. Li, Cheng Li, D.M. Li, F. Li, F.Y. Li, G. Li, H.B. Li, H.J. Li, J.C. Li, J.W. Institute of High Energy Physics Beijing100049 China Beihang University Beijing100191 China Beijing Institute of Petrochemical Technology Beijing102617 China Bochum Ruhr-University BochumD-44780 Germany Carnegie Mellon University PittsburghPA15213 United States Central China Normal University Wuhan430079 China China Center of Advanced Science and Technology Beijing100190 China COMSATS University Islamabad Lahore Campus Defence Road Off Raiwind Road Lahore54000 Pakistan Fudan University Shanghai200443 China Novosibirsk630090 Russia GSI Helmholtzcentre for Heavy Ion Research GmbH DarmstadtD-64291 Germany Guangxi Normal University Guilin541004 China Guangxi University Nanning530004 China Hangzhou Normal University Hangzhou310036 China Helmholtz Institute Mainz Johann-Joachim-Becher-Weg 45 MainzD-55099 Germany Henan Normal University Xinxiang453007 China Henan University of Science and Technology Luoyang471003 China Huangshan College Huangshan245000 China Hunan Normal University Changsha410081 China Hunan University Changsha410082 China Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47405 United States INFN Laboratori Nazionali di Frascati Italy INFN Sezione di Ferrara FerraraI-44122 Italy Institute of Physics and Technology Peace Ave. 54B Ulaanbaatar13330 Mongolia Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 MainzD-55099 Germany Joint Institute for Nuclear Research Dubna Moscow region141980 Russia Justus-Liebig-Universitaet Giessen II. Physikalisches Institut Heinrich-Buff-Ring 16 GiessenD-35392 Germany KVI-CART University of Groningen GroningenNL-9747 AA Netherlands Lanzhou University Lanzhou730000 China Liaoning University Shenyang110036 China Nanjing Normal University Nanjing210023 China Nanjing University Nanjing210093 China Nankai University Tianjin300071 China Peking University Beijing100871 China Shandong Normal University Jinan

Using a total of 11.0 fb−1 of e+e− collision data with center-of-mass energies between 4.009 GeV and 4.6 GeV and collected with the BESIII detector at BEPCII, we measure fifteen exclusive cross sections and effective form factors for the process e+e− → Ξ−Ξ¯+ by means of a single baryon-tag method. After performing a fit to the dressed cross section of e+e− → Ξ−Ξ¯+, no significant ψ(4230) or ψ(4260) resonance is observed in the Ξ−Ξ¯+ final states, and upper limits at the 90% confidence level on ΓeeB for the processes ψ(4230)/ψ(4260) → Ξ−Ξ¯+ are determined. In addition, an excited Ξ baryon at 1820 MeV/c2 is observed with a statistical significance of 5.1σ, and the mass and width are measured to be M = (1825.5±4.7±4.7) MeV/c2 and Γ = (17.0 ± 15.0 ± 7.9) MeV, which confirms the existence of the JP = 32− state Ξ(1820). Copyright © 2019, The Authors. All rights reserved.

关键词： Hadrons

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Measurement of proton electromagnetic form factors in e+e− → pp¯ in the energy region 2.00 - 3.08 GeV

arXiv

引用

arXiv 2019年

作者： Ablikim, M. Achasov, M.N. Adlarson, P. Ahmed, S. Albrecht, M. Alekseev, M. Amoroso, A. An, F.F. An, Q. Bai, Y. Bakina, O. Ferroli, R. Baldini Balossino, I. Ban, Y. Begzsuren, K. Bennett, J.V. Berger, N. Bertani, M. Bettoni, D. Bianchi, F. Biernat, J. Bloms, J. Boyko, I. Briere, R.A. Cai, H. Cai, X. Calcaterra, A. Cao, G.F. Cao, N. Cetin, S.A. Chai, J. Chang, J.F. Chang, W.L. Chelkov, G. Chen, D.Y. Chen, G. Chen, H.S. Chen, J.C. Chen, M.L. Chen, S.J. Chen, Y.B. Cheng, W. Cibinetto, G. Cossio, F. Cui, X.F. Dai, H.L. Dai, J.P. Dai, X.C. Dbeyssi, A. Dedovich, D. Deng, Z.Y. Denig, A. Denysenko, I. Destefanis, M. Mori, F. De Ding, Y. Dong, C. Dong, J. Dong, L.Y. Dong, M.Y. Dou, Z.L. Du, S.X. Fan, J.Z. Fang, J. Fang, S.S. Fang, Y. Farinelli, R. Fava, L. Feldbauer, F. Felici, G. Feng, C.Q. Fritsch, M. Fu, C.D. Fu, Y. Gao, Q. Gao, X.L. Gao, Y. Gao, Y. Gao, Y.G. Gao, Z. Garillon, B. Garzia, I. Gersabeck, E.M. Gilman, A. Goetzen, K. Gong, L. Gong, W.X. Gradl, W. Greco, M. Gu, L.M. Gu, M.H. Gu, S. Gu, Y.T. Guo, A.Q. Guo, L.B. Guo, R.P. Guo, Y.P. Guskov, A. Han, S. Hao, X.Q. Harris, F.A. He, K.L. Heinsius, F.H. Held, T. Heng, Y.K. Himmelreich, M. Hou, Y.R. Hou, Z.L. Hu, H.M. Hu, J.F. Hu, T. Hu, Y. Huang, G.S. Huang, J.S. Huang, X.T. Huang, X.Z. Huesken, N. Hussain, T. Andersson, W. Ikegami Imoehl, W. Irshad, M. Ji, Q. Ji, Q.P. Ji, X.B. Ji, X.L. Jiang, H.L. Jiang, X.S. Jiang, X.Y. Jiao, J.B. Jiao, Z. Jin, D.P. Jin, S. Jin, Y. Johansson, T. Kalantar-Nayestanaki, N. Kang, X.S. Kappert, R. Kavatsyuk, M. Ke, B.C. Keshk, I.K. Khoukaz, A. Kiese, P. Kiuchi, R. Kliemt, R. Koch, L. Kolcu, O.B. Kopf, B. Kuemmel, M. Kuessner, M. Kupsc, A. Kurth, M. Kurth, M.G. Kühn, W. Lange, J.S. Larin, P. Lavezzi, L. Leithoff, H. Lenz, T. Li, C. Li, Cheng Li, D.M. Li, F. Li, F.Y. Li, G. Li, H.B. Li, H.J. Li, J.C. Li, J.W. Institute of High Energy Physics Beijing100049 China Beihang University Beijing100191 China Beijing Institute of Petrochemical Technology Beijing102617 China Bochum Ruhr-University BochumD-44780 Germany Carnegie Mellon University PittsburghPA15213 United States Central China Normal University Wuhan430079 China China Center of Advanced Science and Technology Beijing100190 China COMSATS University Islamabad Lahore Campus Defence Road Off Raiwind Road Lahore54000 Pakistan Fudan University Shanghai200443 China Novosibirsk630090 Russia GSI Helmholtzcentre for Heavy Ion Research GmbH DarmstadtD-64291 Germany Guangxi Normal University Guilin541004 China Guangxi University Nanning530004 China Hangzhou Normal University Hangzhou310036 China Helmholtz Institute Mainz Johann-Joachim-Becher-Weg 45 MainzD-55099 Germany Henan Normal University Xinxiang453007 China Henan University of Science and Technology Luoyang471003 China Huangshan College Huangshan245000 China Hunan Normal University Changsha410081 China Hunan University Changsha410082 China Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47405 United States INFN Laboratori Nazionali di Frascati FrascatiI-00044 Italy INFN and University of Perugia PerugiaI-06100 Italy INFN Sezione di Ferrara FerraraI-44122 Italy University of Ferrara FerraraI-44122 Italy Institute of Physics and Technology Peace Ave. 54B Ulaanbaatar13330 Mongolia Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 MainzD-55099 Germany Joint Institute for Nuclear Research Dubna Moscow region141980 Russia Justus-Liebig-Universitaet Giessen II. Physikalisches Institut Heinrich-Buff-Ring 16 GiessenD-35392 Germany KVI-CART University of Groningen GroningenNL-9747 AA Netherlands Lanzhou University Lanzhou730000 China Liaoning University Shenyang110036 China Nanjing Normal University Nanjing210023 China Nanjing University Nanjing210093 Chi

The process of e+e− → pp¯ is studied at 22 center-of-mass energy points (√s) from 2.00 to 3.08 GeV, exploiting 688.5 pb−1 of data collected with the BESIII detector operating at the BEPCII collider. The Born cross section (σpp¯) of e+e− → pp¯ is measured with the energy-scan technique and it is found to be consistent with previously published data, but with much improved accuracy. In addition, the electromagnetic form-factor ratio (|GE/GM|) and the absolute value of the electric (|GE|) and magnetic (|GM|) form factors are measured by studying the helicity angle of the proton at 16 center-of-mass energy points. |GE/GM| and |GM| are determined with high accuracy, providing uncertainties comparable to data in the space-like region, and |GE| is measured for the first time. We reach unprecedented accuracy, and precision results in the time-like region provide information to improve our understanding of the proton inner structure and to test theoretical models which depend on non-perturbative Quantum Chromodynamics. Copyright © 2019, The Authors. All rights reserved.

关键词： Germanium alloys

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Measurement of branching fractions for D meson decaying into φ meson and a pseudoscalar meson

arXiv

引用

arXiv 2019年

The four decay modes D0 → φπ0, D0 → φη, D+ → φπ+, and D+ → φK+ are studied by using a data sample taken at the centre-of-mass energy √s = 3.773 GeV with the BESIII detector, corresponding to an integrated luminosity of 2.93 fb−1. The branching fractions of the first three decay modes are measured to be B(D0 → φπ0) = (1.168±0.028±0.028)×10−3, B(D0 → φη) = (1.81±0.46±0.06)×10−4, and B(D+ → φπ+) = (5.70±0.05± 0.13) × 10−3, respectively, where the first uncertainties are statistical and the second are systematic. No significant signal is observed of the decay D+ → φK+ and the upper limit of its branching fraction is set for the first time, to be 2.1 × 10−5 at the 90% confidence level. The ratio of B(D0 → φπ0) to B(D+ → φπ+) is calculated to be (20.49 ± 0.50 ± 0.45)%, which is consistent with the theoretical prediction based on isospin symmetry between these two decay modes. Copyright © 2019, The Authors. All rights reserved.

关键词： Hadrons

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Determination of strong-phase parameters in D → KS,L0 π+π−

arXiv

引用

arXiv 2020年

作者： Ablikim, M. Achasov, M.N. Adlarson, P. Ahmed, S. Albrecht, M. Alekseev, M. Ambrose, D. Amoroso, A. An, F.F. An, Q. Anita Bai, Y. Bakina, O. Baldini Ferroli, R. Balossino, I. Ban, Y. Begzsuren, K. Bennett, J.V. Berger, N. Bertani, M. Bettoni, D. Bianchi, F. Biernat, J. Bloms, J. Boyko, I. Briere, R.A. Cai, H. Cai, X. Calcaterra, A. Cao, G.F. Cao, N. Cetin, S.A. Chai, J. Chang, J.F. Chang, W.L. Chelkov, G. Chen, D.Y. Chen, G. Chen, H.S. Chen, J. Chen, J.C. Chen, M.L. Chen, S.J. Chen, Y.B. Cheng, W. Cibinetto, G. Cossio, F. Cui, X.F. Dai, H.L. Dai, J.P. Dai, X.C. Dbeyssi, A. Dedovich, D. Deng, Z.Y. Denig, A. Denysenko, I. Destefanis, M. de Mori, F. Ding, Y. Dong, C. Dong, J. Dong, L.Y. Dong, M.Y. Dou, Z.L. Du, S.X. Fan, J.Z. Fang, J. Fang, S.S. Fang, Y. Farinelli, R. Fava, L. Feldbauer, F. Felici, G. Feng, C.Q. Fritsch, M. Fu, C.D. Fu, Y. Gao, Q. Gao, X.L. Gao, Y. Gao, Y. Gao, Y.G. Gao, Z. Garillon, B. Garzia, I. Gersabeck, E.M. Gilman, A. Goetzen, K. Gong, L. Gong, W.X. Gradl, W. Greco, M. Gu, L.M. Gu, M.H. Gu, S. Gu, Y.T. Guo, A.Q. Guo, L.B. Guo, R.P. Guo, Y.P. Guskov, A. Han, S. Hao, X.Q. Harris, F.A. He, K.L. Heinsius, F.H. Held, T. Heng, Y.K. Himmelreich, M. Hou, Y.R. Hou, Z.L. Hu, H.M. Hu, J.F. Hu, T. Hu, Y. Huang, G.S. Huang, J.S. Huang, X.T. Huang, X.Z. Huesken, N. Hussain, T. Ikegami Andersson, W. Imoehl, W. Irshad, M. Ji, Q. Ji, Q.P. Ji, X.B. Ji, X.L. Jiang, H.L. Jiang, X.S. Jiang, X.Y. Jiao, J.B. Jiao, Z. Jin, D.P. Jin, S. Jin, Y. Johansson, T. Kalantar-Nayestanaki, N. Kang, X.S. Kappert, R. Kavatsyuk, M. Ke, B.C. Keshk, I.K. Khoukaz, A. Kiese, P. Kiuchi, R. Kliemt, R. Koch, L. Kolcu, O.B. Kopf, B. Kuemmel, M. Kuessner, M. Kupsc, A. Kurth, M. Kurth, M.G. Kühn, W. Lange, J.S. Larin, P. Lavezzi, L. Leithoff, H. Lenz, T. Li, C. Li, Cheng Li, D.M. Li, F. Li, F.Y. Li, G. Institute of High Energy Physics Beijing100049 China Beihang University Beijing100191 China Beijing Institute of Petrochemical Technology Beijing102617 China Bochum Ruhr-University BochumD-44780 Germany Carnegie Mellon University PittsburghPA15213 United States Central China Normal University Wuhan430079 China China Center of Advanced Science and Technology Beijing100190 China COMSATS University Islamabad Lahore Campus Defence Road Off Raiwind Road Lahore54000 Pakistan Fudan University Shanghai200443 China Novosibirsk630090 Russia GSI Helmholtzcentre for Heavy Ion Research GmbH DarmstadtD-64291 Germany Guangxi Normal University Guilin541004 China Guangxi University Nanning530004 China Hangzhou Normal University Hangzhou310036 China Helmholtz Institute Mainz Johann-Joachim-Becher-Weg 45 MainzD-55099 Germany Henan Normal University Xinxiang453007 China Henan University of Science and Technology Luoyang471003 China Huangshan College Huangshan245000 China Hunan Normal University Changsha410081 China Hunan University Changsha410082 China Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47405 United States INFN Laboratori Nazionali di Frascati FrascatiI-00044 Italy INFN and University of Perugia PerugiaI-06100 Italy INFN Sezione di Ferrara FerraraI-44122 Italy University of Ferrara FerraraI-44122 Italy Institute of Physics and Technology Peace Ave. 54B Ulaanbaatar13330 Mongolia Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 MainzD-55099 Germany Joint Institute for Nuclear Research Dubna Moscow region141980 Russia Justus-Liebig-Universitaet Giessen II. Physikalisches Institut Heinrich-Buff-Ring 16 GiessenD-35392 Germany KVI-CART University of Groningen GroningenNL-9747 AA Netherlands Lanzhou University Lanzhou730000 China Liaoning University Shenyang110036 China Nanjing Normal University Nanjing210023 China Nanjing University Nanjing210093 Chi

We report the most precise measurements to date of the strong-phase parameters between D0 and D¯ 0 decays to KS,L0 π+π− using a sample of 2.93 fb−1 of e+e− annihilation data collected at a center-of-mass energy of 3.773 GeV with the BESIII detector at the BEPCII collider. Our results provide the key inputs for a binned model-independent determination of the Cabibbo-Kobayashi-Maskawa angle γ/φ3 with B decays. Using our results, the decay model sensitivity to the γ/φ3 measurement is expected to be between 0.7◦ and 1.2◦, approximately a factor of three smaller than that achievable with previous measurements. The improved precision of this work ensures that measurements of γ/φ3 will not be limited by knowledge of strong phases for the next decade. Furthermore, our results provide critical input for other flavor-physics investigations, including charm mixing, other measurements of CP violation, and the measurement of strong-phase parameters for other D-decay modes. Copyright © 2020, The Authors. All rights reserved.

关键词： Parameter estimation

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Model-independent determination of the relative strong-phase difference between D0and D0→ K0S,Lπ+π-and its impact on the measurement of the CKM angle γ/φ3

arXiv

引用

arXiv 2020年

作者： Ablikim, M. Achasov, M.N. Adlarson, P. Ahmed, S. Albrecht, M. Alekseev, M. Ambrose, D. Amoroso, A. An, F.F. An, Q. Anita Bai, Y. Bakina, O. Ferroli, R. Baldini Balossino, I. Ban, Y. Begzsuren, K. Bennett, J.V. Berger, N. Bertani, M. Bettoni, D. Bianchi, F. Biernat, J. Bloms, J. Boyko, I. Briere, R.A. Cai, H. Cai, X. Calcaterra, A. Cao, G.F. Cao, N. Cetin, S.A. Chai, J. Chang, J.F. Chang, W.L. Chelkov, G. Chen, D.Y. Chen, G. Chen, H.S. Chen, J. Chen, J.C. Chen, M.L. Chen, S.J. Chen, Y.B. Cheng, W. Cibinetto, G. Cossio, F. Cui, X.F. Dai, H.L. Dai, J.P. Dai, X.C. Dbeyssi, A. Dedovich, D. Deng, Z.Y. Denig, A. Denysenko, I. Destefanis, M. De Mori, F. Ding, Y. Dong, C. Dong, J. Dong, L.Y. Dong, M.Y. Dou, Z.L. Du, S.X. Fan, J.Z. Fang, J. Fang, S.S. Fang, Y. Farinelli, R. Fava, L. Feldbauer, F. Felici, G. Feng, C.Q. Fritsch, M. Fu, C.D. Fu, Y. Gao, Q. Gao, X.L. Gao, Y. Gao, Y. Gao, Y.G. Gao, Z. Garillon, B. Garzia, I. Gersabeck, E.M. Gilman, A. Goetzen, K. Gong, L. Gong, W.X. Gradl, W. Greco, M. Gu, L.M. Gu, M.H. Gu, S. Gu, Y.T. Guo, A.Q. Guo, L.B. Guo, R.P. Guo, Y.P. Guskov, A. Han, S. Hao, X.Q. Harris, F.A. He, K.L. Heinsius, F.H. Held, T. Heng, Y.K. Himmelreich, M. Hou, Y.R. Hou, Z.L. Hu, H.M. Hu, J.F. Hu, T. Hu, Y. Huang, G.S. Huang, J.S. Huang, X.T. Huang, X.Z. Huesken, N. Hussain, T. Andersson, W. Ikegami Imoehl, W. Irshad, M. Ji, Q. Ji, Q.P. Ji, X.B. Ji, X.L. Jiang, H.L. Jiang, X.S. Jiang, X.Y. Jiao, J.B. Jiao, Z. Jin, D.P. Jin, S. Jin, Y. Johansson, T. Kalantar-Nayestanaki, N. Kang, X.S. Kappert, R. Kavatsyuk, M. Ke, B.C. Keshk, I.K. Khoukaz, A. Kiese, P. Kiuchi, R. Kliemt, R. Koch, L. Kolcu, O.B. Kopf, B. Kuemmel, M. Kuessner, M. Kupsc, A. Kurth, M. Kurth, M.G. Kühn, W. Lange, J.S. Larin, P. Lavezzi, L. Leithoff, H. Lenz, T. Li, C. Li, Cheng Li, D.M. Li, F. Lil, F.Y. Li, G. Institute of High Energy Physics Beijing100049 China Beihang University Beijing100191 China Beijing Institute of Petrochemical Technology Beijing102617 China Bochum Ruhr-University BochumD-44780 Germany Carnegie Mellon University PittsburghPA15213 United States Central China Normal University Wuhan430079 China China Center of Advanced Science and Technology Beijing100190 China COMSATS University Islamabad Lahore Campus Defence Road Off Raiwind Road Lahore54000 Pakistan Fudan University Shanghai200443 China Novosibirsk630090 Russia GSI Helmholtzcentre for Heavy Ion Research GmbH DarmstadtD-64291 Germany Guangxi Normal University Guilin541004 China Guangxi University Nanning530004 China Hangzhou Normal University Hangzhou310036 China Helmholtz Institute Mainz Johann-Joachim-Becher-Weg 45 MainzD-55099 Germany Henan Normal University Xinxiang453007 China Henan University of Science and Technology Luoyang471003 China Huangshan College Huangshan245000 China Hunan Normal University Changsha410081 China Hunan University Changsha410082 China Indian Institute of Technology Madras Chennai600036 India Indiana University BloomingtonIN47405 United States INFN Laboratori Nazionali di Frascati FrascatiI-00044 Italy INFN Sezione di Ferrara FerraraI-44122 Italy Institute of Physics and Technology Peace Ave. 54B Ulaanbaatar13330 Mongolia Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 MainzD-55099 Germany Joint Institute for Nuclear Research Dubna Moscow Region141980 Russia Justus-Liebig-Universitaet Giessen II. Physikalisches Institut Heinrich-Buff-Ring 16 GiessenD-35392 Germany KVI-CART University of Groningen GroningenNL-9747 AA Netherlands Lanzhou University Lanzhou730000 China Liaoning University Shenyang110036 China Nanjing Normal University Nanjing210023 China Nanjing University Nanjing210093 China Nankai University Tianjin300071 China Peking University Beijing100871 China Shandong Normal

Crucial inputs for a variety of CP-violation studies can be determined through the analysis of pairs of quantum-entangled neutral D mesons, which are produced in the decay of the ψ(3770) resonance. The relative strong-phase parameters between D0and D0in the decays D0→ K0S,Lπ+π-are studied using 2.93 fb-1of e+e-annihilation data delivered by the BEPCII collider and collected by the BESIII detector at a centerof-mass energy of 3.773 GeV. Results are presented in regions of the phase space of the decay. These are the most precise measurements to date of the strong-phase parameters in D → KS,L0π+π-decays. Using these parameters, the associated uncertainty on the Cabibbo-Kobayashi-Maskawa angle γ/φ3is expected to be between 0.7° and 1.2°, for an analysis using the decay B±→ DK±, D → KS0π+π-, where D represents a superposition of D0and D0states. This is a factor of three smaller than that achievable with previous measurements. Furthermore, these results provide valuable input for charm-mixing studies, other measurements of CP violation, and the measurement of strong-phase parameters for other D-decay modes. Copyright © 2020, The Authors. All rights reserved.

关键词： Supersymmetry

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Measurement of higher-order multipole amplitudes in ψ(3686) → γχc1,2 with χc1,2 → γJ/ψ and search for the transition ηc(2S) → γJ/ψ

arXiv

引用

arXiv 2017年

作者： Ablikim, M. Achasov, M.N. Ai, X.C. Albayrak, O. Albrecht, M. Ambrose, D.J. An, F.F. An, Q. Bai, J.Z. Ferroli, R. Baldini Ban, Y. Bennett, D.W. Bennett, J.V. Bertani, M. Bettoni, D. Bian, J.M. Boger, E. Boyko, I. Briere, R.A. Cai, H. Cai, X. Cakir, O. Calcaterra, A. Cao, G.F. Chang, J.F. Chelkov, G. Chen, G. Chen, H.S. Chen, H.Y. Chen, J.C. Chen, M.L. Chen, S. Chen, S.J. Chen, X. Chen, X.R. Chen, Y.B. Cheng, H.P. Chu, X.K. Cibinetto, G. Dai, H.L. Dai, J.P. Dbeyssi, A. Dedovich, D. Deng, Z.Y. Denig, A. Denysenko, I. Ding, Y. Dong, C. Dong, J. Dong, L.Y. Dong, M.Y. Dou, Z.L. Du, S.X. Duan, P.F. Fan, J.Z. Fang, J. Fang, S.S. Fang, X. Fang, Y. Farinelli, R. Fedorov, O. Feldbauer, F. Felici, G. Feng, C.Q. Fritsch, M. Fu, C.D. Gao, Q. Gao, X.L. Gao, X.Y. Gao, Y. Gao, Z. Goetzen, K. Gong, L. Gong, W.X. Gradl, W. Gu, M.H. Gu, Y.T. Guan, Y.H. Guo, A.Q. Guo, L.B. Guo, R.P. Guo, Y. Guo, Y.P. Haddadi, Z. Hafner, A. Han, S. Hao, X.Q. Harris, F.A. He, K.L. Held, T. Heng, Y.K. Hou, Z.L. Hu, C. Hu, H.M. Hu, T. Hu, Y. Huang, G.S. Huang, J.S. Huang, X.T. Huang, X.Z. Huang, Y. Huang, Z.L. Hussain, T. Ji, Q. Ji, Q.P. Ji, X.B. Ji, X.L. Jiang, L.W. Jiang, X.S. Jiang, X.Y. Jiao, J.B. Jiao, Z. Jin, D.P. Jin, S. Johansson, T. Julin, A. Kalantar-Nayestanaki, N. Kang, X.L. Kang, X.S. Kavatsyuk, M. Ke, B.C. Kiese, P. Kliemt, R. Kloss, B. Kolcu, O.B. Kopf, B. Kornicer, M. Kupsc, A. Kühn, W. Lange, J.S. Lara, M. Larin, P. Leithoff, H. Li, C. Li, Cheng Li, D.M. Li, F. Li, F.Y. Li, G. Li, H.B. Li, H.J. Li, J.C. Li, Jin Li, K. Li, K. Li, Lei Li, P.R. Li, Q.Y. Li, T. Li, W.D. Li, W.G. Li, X.L. Li, X.M. Li, X.N. Li, X.Q. Li, Y.B. Li, Z.B. Liang, H. Liang, J.J. Liang, Y.F. Liang, Y.T. Liao, G.R. Lin, D.X. Liu, B. Liu, B.J. Liu, C.X. Liu, D. Liu, F.H. Liu, Fang Liu, Feng Liu, H.B. Liu, H.H. Liu, H.H. Henan Normal University Xinxiang453007 China Henan University of Science and Technology Luoyang471003 China Huangshan College Huangshan245000 Korea Republic of Hunan University Changsha410082 China Indiana University BloomingtonIN47405 United States INFN Laboratori Nazionali di Frascati I-00044 Italy INFN Sezione di Ferrara FerraraI-44122 Italy Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 MainzD-55099 Germany Joint Institute for Nuclear Research Dubna Moscow region141980 Russia Justus-Liebig-Universitaet Giessen II. Physikalisches Institut Heinrich-Buff-Ring 16 GiessenD-35392 Germany KVI-CART University of Groningen GroningenNL-9747 AA Netherlands Lanzhou University Lanzhou730000 China Liaoning University Shenyang110036 China Nanjing Normal University Nanjing210023 China Nanjing University Nanjing210093 China Nankai University Tianjin300071 Korea Republic of Peking University Beijing100871 China Seoul National University Seoul151-747 China Shandong University Jinan250100 China Shanghai Jiao Tong University Shanghai200240 China Shanxi University Taiyuan030006 China Sichuan University Chengdu610064 China Soochow University Suzhou215006 China Sun Yat-Sen University Guangzhou510275 China Tsinghua University Beijing100084 China Uludag University Bursa16059 Turkey University of Chinese Academy of Sciences Beijing100049 China University of Hawaii HonoluluHI96822 United States University of Minnesota MinneapolisMN55455 United States University of Rochester RochesterNY14627 United States University of Science and Technology Liaoning Anshan114051 China University of Science and Technology of China Hefei230026 China University of South China Hengyang421001 China University of the Punjab Lahore54590 Pakistan University of Turin INFN TurinI-10125 Italy Uppsala University Box 516 UppsalaSE-75120 Sweden Wuhan University Wuhan430072 China Zhejiang University Hangzhou310027 China Zhe

Using 106 million ψ(3686) events collected with the BESIII detector, we measure multipole amplitudes for the decay ψ(3686) → γχc1,2 → γγJ/ψ beyond the dominant electric-dipole amplitudes. The normalized magnetic-quadrupole amplitude for ψ(3686) → γχc1,2 → γγJ/ψ and the normalized electric-octupole amplitudes for ψ(3686) → γχc2, χc2 → γJ/ψ are determined. The M2 amplitudes for ψ(3686) → γχc1 and χc1,2 → γJ/ψ are found to differ significantly from zero and are consistent with theoretical predictions. We also obtain the ratios of M2 contributions of ψ(3686) and J/ψ decays to χc1,2, b12/b22 = 1.35 ± 0.72 and a12/a22 = 0.617 ± 0.083, which agree well with theoretical expectations. By considering the multipole contributions of χc1,2, we measure the product branching fractions for the cascade decays ψ(3686) → γχc0,1,2 → γγJ/ψ and search for the process ηc(2S) → γJ/ψ through ψ(3686) → γηc(2S). The product branching fraction for ψ(3686) → γχc0 → γγJ/ψ is 3σ larger than published measurements, while those of ψ(3686) → γχc1,2 → γγJ/ψ are consistent. No significant signal for the decay ψ(3686) → γηc(2S) → γγJ/ψ is observed, and the upper limit of the product branching fraction at the 90% confidence level is determined. Copyright © 2017, The Authors. All rights reserved.

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