检索结果-内蒙古大学图书馆

arXiv 2018年

作者： Ablikim, M. Achasov, M.N. Ahmed, S. Albayrak, O. Albrecht, M. Alekseev, M. Ambrose, D.J. Amoroso, A. An, F.F. An, Q. Bai, J.Z. Bakina, O. Baldini Ferroli, R. Ban, Y. Bennett, D.W. Bennett, J.V. Berger, N. Bertani, M. Bettoni, D. Bian, J.M. Bianchi, F. Boger, E. Boyko, I. Briere, R.A. Cai, H. Cai, X. Cakir, O. Calcaterra, A. Cao, G.F. Cetin, S.A. Chai, J. Chang, J.F. 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. 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, X. Fang, Y. Farinelli, R. Fava, L. Fegan, S. Feldbauer, F. Felici, G. Feng, C.Q. Fioravanti, E. Fritsch, M. Fu, C.D. Gao Gao, Q. Gao, X.L. Gao, Y. Gao, Z. 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, L.B. Guo, R.P. Guo, Y.P. Haddadi, Z. Hafner, A. 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, C. Hu, H.M. Hu, T. Hu, Y. Huang, G.S. Huang, J.S. Huang, X.T. Huang, X.Z. Huang, Z.L. Hussain, T. Ikegami Andersson, W. 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. Johansson, T. Julin, A. Kalantar-Nayestanaki, N. Kang, X.L. Kang, X.S. Kavatsyuk, M. Ke, B.C. Khan, Tabassum Khan Kiese, P. Kliemt, R. Kloss, B. Kolcu, O.B. Kopf, B. Kornicer, 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. Li, K. Li, Lei Li, P.L. Li, P.R. Li, Q.Y. Li, T. 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 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 China Seoul National University Seoul151-747 Korea Republic

The decay J/ψ → γγφ is studied using a sample of 1.31×109 J/ψ events collected with the BESIII detector. Two structures around 1475 MeV/c2 and 1835 MeV/c2 are observed in the γφ invariant mass spectrum for the first time. With a fit on the γφ invariant mass, which takes into account the interference between the two structures, and a simple analysis of the angular distribution, the structure around 1475 MeV/c2 is found to favor an assignment as the η(1475) and the mass and width for the structure around 1835 MeV/c2 are consistent with the X(1835). The statistical significances of the two structures are 13.5σ and 6.3σ, respectively. The results indicate that both η(1475) and X(1835) contain a sizeable ss¯ component. Copyright © 2018, The Authors. All rights reserved.

关键词： Angular distribution

来源：评论

学校读者我要写书评

暂无评论

Kinetics of first order magnetostructural transition in single crystalline FeRh thin film

Kinetics of first order magnetostructural transition in sing...

引用

International Conference on Magnetics (INTERMAG)

作者： W. Lu Y. Xu X. Fang Y. Song X. Li School of Materials Science and Engineering Tongji University Shanghai National Key Laboratory of Science Technology Near-surface Detection and Sensing Technology Wuxi University of Shanghai for Science and Technology Shanghai

This study reports the temperature- and time-dependent magnetization of the ferromagnetic phase in epitaxial FeRh thin films across the antiferromagnetic-ferromagnetic transition on both heating and cooling process by vibrating sample magnetometry. The thin films are deposited on MgO (001) substrates by co-evaporation method and vacuum annealed at 700 K for 2 h. X-ray diffraction is employed for structural characterization. Results from the magnetization curves indicate that the nucleation and growth behaviors of the single crystalline thin film are similar to crystallization of solids.

关键词： Magnetic hysteresis Magnetization Frequency modulation Temperature measurement Magnetic films Amorphous magnetic materials Magnetic fields

来源：评论

学校读者我要写书评

暂无评论

Observation and study of the decay J/ψ → φηη0

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, J.Z. 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. Cakir, O. Calcaterra, A. Cao, G.F. Cetin, S.A. Chai, J. Chang, J.F. 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, M.H. 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. 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. 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, Jin Li, K.J. Li, Kang Li, Ke Li, Lei Li, P.L. Li, P.R. 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

We report the observation and study of the decay J/ψ → φηη' using 1.3 × 109 J/ψ events collected with the BESIII detector. Its branching fraction, including all possible intermediate states, is measured to be (2.32 ± 0.06 ± 0.16) × 10−4. We also report evidence for a structure, denoted as X, in the φη' mass spectrum in the 2.0 − 2.1 GeV/c2 region. Using two decay modes of the η' meson (γπ+π− and ηπ+π−), a simultaneous fit to the φη' mass spectra is performed. Assuming the quantum numbers of the X to be JP = 1−, its significance is found to be 4.4σ, with a mass and width of (2002.1±27.5±21.4) MeV/c2 and (129±17±9) MeV, respectively, and a product branching fraction B(J/ψ → ηX)×B(X → φη') = (9.8±1.2±1.7)×10−5. Alternatively, assuming JP = 1+, the significance is 3.8σ, with a mass and width of (2062.8±13.1±7.2) MeV/c2 and (177±36±35) MeV, respectively, and a product branching fraction B(J/ψ → ηX)×B(X → φη') = (9.6±1.4±2.0)×10−5. The angular distribution of J/ψ → ηX is studied and the two JP assumptions of the X cannot be clearly distinguished due to the limited statistics. In all measurements the first uncertainties are statistical and the second systematic. Copyright © 2018, The Authors. All rights reserved.

关键词： Angular distribution

来源：评论

学校读者我要写书评

暂无评论

Link quality and energy-efficient cross-layer routing protocol for low power wireless sensor network

引用

Journal of Computational Information Systems 2015年第15期11卷 5639-5646页

作者： Wang, Xi Chen, Jiapin Zhao, Shuai Li, Zhenbo Hu, Shouwei Key Laboratory of Thin Film and Microfabrication of Ministry of Education School of Electronics Information and Electrical Engineering Shanghai Jiaotong University Shanghai China Science and Technology on Near Surface Detection Laboratory College of Computer Science Wuxi China

Wireless sensor network is usually used in external environment, which is not artificially controlled, using battery as its power supply. Therefore, how to reduce power consumption via legitimate routing protocol and improve the lifetime of the network, are being widely studied in recent years. In this paper, we propose a cross-layer routing protocol that considered link quality and energy-efficiency simultaneously during the routing establishment phase. Then during the routing maintenance phase, the protocol utilizes link quality and the remaining energy of nodes to predict the routing interruption and perform local repair. The protocol is simulated on IEEE 802.15.4 Matlab Simulator. The result shows that our protocol effectively improves lifetime and the data delivery ratio of the network, and also the performance and stability of AODV. Copyright © 2015 Binary Information Press.

关键词： Routing protocols

来源：评论

学校读者我要写书评

暂无评论

Search for a strangeonium-like structure Zs decaying into φπ and a measurement of the cross section e+e− → φππ

arXiv

引用

arXiv 2018年

作者： Ablikim, M. Achasov, M.N. Ahmed, S. Albrecht, 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. Bian, J.M. Bianchi, F. Boger, E. Boyko, I. Briere, R.A. Cai, H. Cai, X. Cakir, O. Calcaterra, A. Cao, G.F. Cetin, S.A. Chai, J. Chang, J.F. 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. 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. 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. Garzia, I. Goetzen, K. Gong, L. Gong, W.X. Gradl, W. Greco, M. Gu, M.H. Gu, Y.T. Guo, A.Q. Guo, R.P. Guo, Y.P. 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, T. Hu, Y. Huang, G.S. Huang, J.S. Huang, X.T. Huang, X.Z. Huang, Z.L. Hussain, T. Ikegami Andersson, W. 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.L. 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. Kuessner, 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. Liang, H. 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 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 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 Seoul National University Seoul151-747 Korea Republic of

Using a data sample of e+e− collision data corresponding to an integrated luminosity of 108 pb−1 collected with the BESIII detector at a center-of-mass energy of 2.125 GeV, we study the process e+e− → φππ and search for a strangeoniumlike structure Zs decaying into φπ. No signal is observed in the φπ mass spectrum. Upper limits on the cross sections for Zs production at the 90% confidence level are determined. In addition, the cross sections of e+e− → φπ+π− and e+e− → φπ0π0 at 2.125 GeV are measured to be (436.2 ± 6.4 ± 30.1) pb and (237.0 ± 8.6 ± 15.4) pb, respectively, where the first uncertainties are statistical and the second systematic. Copyright © 2018, The Authors. All rights reserved.

关键词： Germanium alloys

来源：评论

学校读者我要写书评

暂无评论

Study of two-photon decays of pseudoscalar mesons via J/ψ radiative decays

arXiv

引用

arXiv 2018年

作者： Ablikim, M. Achasov, M.N. Ahmed, S. Albrecht, 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. Bian, J.M. Bianchi, F. Boger, E. Boyko, I. Briere, R.A. Cai, H. Cai, X. Cakir, O. Calcaterra, A. Cao, G.F. Cetin, S.A. Chai, J. Chang, J.F. 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. 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. 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. Garzia, I. Goetzen, K. Gong, L. Gong, W.X. Gradl, W. Greco, M. Gu, M.H. Gu, Y.T. Guo, A.Q. Guo, R.P. Guo, Y.P. 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, T. Hu, Y. Huang, G.S. Huang, J.S. 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.L. 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. Liang, H. Liang, Y.F. Liang, Y.T. 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 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 China Seoul National University Seoul151-747 Korea Republic

Using a sample of 4.48 × 108 ψ(3686) events collected with the BESIII detector at the BEPCII collider, we study the two-photon decays of the pseudoscalar mesons π0, η, η′, η(1405), η(1475), η(1760), and X(1835) in J/ψ radiative decays using ψ(3686) → π+π−J/ψ events. The π0, η and η′ mesons are clearly observed in the two-photon mass spectra, and the branching fractions are determined to be B(J/ψ → γπ0 → 3γ) = (3.57 ± 0.12 ± 0.16) × 10−5, B(J/ψ → γη → 3γ) = (4.42 ± 0.04 ± 0.18) × 10−4, and B(J/ψ → γη′ → 3γ) = (1.26 ± 0.02 ± 0.05) × 10−4, where the first errors are statistical and the second systematic. No clear signal for η(1405), η(1475), η(1760) or X(1835) is observed in the two-photon mass spectra, and upper limits at the 90% confidence level on the product branching fractions are obtained. Copyright © 2018, The Authors. All rights reserved.

关键词： Bosons

来源：评论

学校读者我要写书评

暂无评论

Measurements of the branching fractions of the singly-cabibbo-suppressed decays D0 → ωη, η(′)π0 and η(′)η

arXiv

引用

arXiv 2018年

作者： Ablikim, M. Achasov, M.N. Ahmed, S. Albayrak, O. Albrecht, M. Ambrose, D.J. Amoroso, A. An, F.F. An, Q. Bai, J.Z. Bakina, O. Baldini Ferroli, R. Ban, Y. Bennett, D.W. Bennett, J.V. Berger, N. Bertani, M. Bettoni, D. Bian, J.M. Bianchi, F. Boger, E. Boyko, I. Briere, R.A. Cai, H. Cai, X. Cakir, O. Calcaterra, A. Cao, G.F. Cetin, S.A. Chai, J. Chang, J.F. 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. 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. Dou, Z.L. Du, S.X. Duan, P.F. Fang, J. Fang, S.S. Fang, X. Fang, Y. 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. 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, L.B. Guo, R.P. Guo, Y.P. Haddadi, Z. Hafner, A. 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, C. Hu, H.M. Hu, T. Hu, Y. Huang, G.S. Huang, J.S. Huang, X.T. Huang, X.Z. Huang, Z.L. Hussain, T. Ikegami Andersson, W. 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. Johansson, T. Julin, A. Kalantar-Nayestanaki, N. Kang, X.L. Kang, X.S. Kavatsyuk, M. Ke, B.C. Khan, T. Kiese, P. Kliemt, R. Kloss, B. Kolcu, O.B. Kopf, B. Kornicer, 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, Kang Li, Ke Li, Lei Li, P.L. Li, P.R. Li, Q.Y. Li, T. Li, W.D. Li, W.G. Li, X.L. Li, X.N. Li, X.Q. Li, Z.B. Liang, H. Liang, Y.F. 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 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 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 Seoul National University Seoul151-747 Korea Republic of

By analyzing a data sample of 2.93 fb−1 collected at √s = 3.773 GeV with the BESIII detector operated at the BEPCII storage rings, we measure the branching fractions B(D0 → ωη) = (2.15 ± 0.17stat. ± 0.15sys.) × 10−3, B(D0 → ηπ0) = (0.58 ± 0.05stat. ± 0.05sys.) × 10−3, B(D0 → η′π0) = (0.93 ± 0.11stat. ± 0.09sys.) × 10−3, B(D0 → ηη) = (2.20 ± 0.07stat. ± 0.06sys.) × 10−3 and B(D0 → η′η) = (0.94 ± 0.25stat. ± 0.11sys.) × 10−3. We note that B(D0 → ωη) is measured for the first time and that B(D0 → ηη) is measured with much improved precision. Copyright © 2018, The Authors. All rights reserved.

关键词： Digital storage

来源：评论

学校读者我要写书评

暂无评论

Measurement of the phase between strong and electromagnetic amplitudes of J/ψ decays

arXiv

引用

arXiv 2018年

作者： Ablikim, M. Achasov, M.N. Ahmed, S. Albrecht, M. Amoroso, A. An, F.F. An, Q. Bai, Y. Bakina, O. Baldini Ferroli, R. Ban, Y. Bennett, D.W. Bennett, J.V. Berger, N. Bertani, M. Bian, J.M. Bianchi, F. Boger, E. Boyko, I. Briere, R.A. Cai, H. Cai, X. Cakir, O. Calcaterra, A. Cao, G.F. Cetin, S.A. Chai, J. Chang, J.F. 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. Chu, X.K. 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, X. Fang, Y. Farinelli, R. Fava, L. Fegan, S. Feldbauer, F. Felici, G. Feng, C.Q. Fritsch, M. Fu, C.D. Gao, Q. Gao, X.L. Gao, Y. Gao, Y.G. Gao, Z. Goetzen, K. Gong, L. Gong, W.X. Gradl, W. Greco, M. Gu, M.H. Gu, S. Gu, Y.T. Guo, A.Q. Guo, L.B. Guo, R.P. Guo, Y.P. Haddadi, Z. Han, S. Hao, X.Q. Harris, F.A. He, K.L. Heinsius, F.H. Held, T. Heng, Y.K. Holtmann, T. 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, 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.L. 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. Kuessner, M. Kuhlmann, M. Kupsc, A. Kühn, W. Lange, J.S. Lara, M. Larin, P. Lavezzi, L. Leiber, S. 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, K.J. Li, Kang Li, Ke Li, Lei Li, P.L. Li, P.R. Li, Q.Y. Li, T. Li, W.D. Li, W.G. Li, X.L. Li, X.N. Li, X.Q. Li, Z.B. Liang, H. Liang, Y.F. Liang, Y.T. Liao, G.R. 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 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 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 Seoul National University Seoul151-747 Korea Republic o

Using 16 energy points of e+e− annihilation data collected in the vicinity of the J/ψ resonance with the BESIII detector and with a total integrated luminosity of around 100 pb−1, we study the relative phase between the strong and electromagnetic amplitudes of J/ψ decays. The relative phase between J/ψ electromagnetic decay and the continuum process (e+e− annihilation without the J/ψ resonance) is confirmed to be zero by studying the cross section lineshape of µ+µ− production. The relative phase between J/ψ strong and electromagnetic decays is then measured to be (84.9 ±3.6)◦ or (−84.7 ±3.1)◦ for the 2(π+π−)π0 final state by investigating the interference pattern between the J/ψ decay and the continuum process. This is the first measurement of the relative phase between J/ψ strong and electromagnetic decays into a multihadron final state using the lineshape of the production cross section. We also study the production lineshape of the multihadron final state ηπ+π− with η → π+π−π0, which provides additional information about the phase between the J/ψ electromagnetic decay amplitude and the continuum process. Additionally, the branching fraction of J/ψ → 2(π+π−)π0 is measured to be (4.73±0.44)% or (4.85±0.45)%, and the branching fraction of J/ψ → ηπ+π− is measured to be (3.78±0.68)×10−4. Both of them are consistent with the world average values. The quoted uncertainties include both statistical and systematic uncertainties, which are mainly caused by the low statistics. Copyright © 2018, The Authors. All rights reserved.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Observation of e+e− → KKJ/ψ ¯ at center-of-mass energies from 4.189 to 4.600 GeV

arXiv

引用

arXiv 2018年

作者： Ablikim, M. Achasov, M.N. Ahmed, S. Albrecht, M. Amoroso, A. An, F.F. An, Q. Bai, J.Z. Bakina, O. Baldini Ferroli, R. Ban, Y. Bennett, D.W. Bennett, J.V. Berger, N. Bertani, M. Bettoni, D. Bian, J.M. Bianchi, F. Boger, E. Boyko, I. Briere, R.A. Cai, H. Cai, X. Cakir, O. Calcaterra, A. Cao, G.F. Cetin, S.A. Chai, J. Chang, J.F. 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. 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. Dou, Z.L. Du, S.X. Duan, P.F. Fang, J. Fang, S.S. Fang, X. 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. Goetzen, K. Gong, L. Gong, W.X. Gradl, W. Greco, M. Gu, M.H. Gu, S. Gu, Y.T. Guo, A.Q. Guo, L.B. Guo, R.P. Guo, Y.P. 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, C. Hu, H.M. Hu, T. Hu, Y. Huang, G.S. Huang, J.S. 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. Johansson, T. Julin, A. Kalantar-Nayestanaki, N. Kang, X.L. Kang, X.S. Kavatsyuk, M. Ke, B.C. Khan, T. 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. Leiber, S. 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, J.Q. Li, Jin Li, Kang Li, Ke Li, Lei Li, P.L. Li, P.R. Li, Q.Y. Li, T. Li, W.D. Li, W.G. Li, X.L. Li, X.N. Li, X.Q. Li, Z.B. Liang, H. Liang, Y.F. Liang, Y.T. 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 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 China Seoul National University Seoul151-747 Korea Republic

We investigate the process e+e− → KKJ/ψ ¯ at center-of-mass energies from 4.189 to 4.600 GeV using 4.7 fb−1 of data collected by the BESIII detector at the BEPCII collider. The Born cross sections for the reactions e+e− → K+K−J/ψ and KS0 KS0 J/ψ are measured as a function of center-of-mass energy. The energy dependence of the cross section for e+e− → K+K−J/ψ is shown to differ from that for π+π−J/ψ in the region around the Y (4260). In addition, there is evidence for a structure around 4.5 GeV in the e+e− → K+K−J/ψ cross section that is not present in π+π−J/ψ. Copyright © 2018, The Authors. All rights reserved.

关键词： Germanium alloys

来源：评论

学校读者我要写书评

暂无评论

Observation of ψ(3686) → nn¯ and improved measurement of ψ(3686) → pp¯

arXiv

引用

arXiv 2018年

作者： Ablikim, M. Achasov, M.N. Ahmed, S. Albrecht, M. Ambrose, D.J. Amoroso, A. An, F.F. An, Q. Bai, J.Z. Bakina, O. Baldini Ferroli, R. Ban, Y. Bennett, D.W. Bennett, J.V. Berger, N. Bertani, M. Bettoni, D. Bian, J.M. Bianchi, F. Boger, E. Boyko, I. Briere, R.A. Cai, H. Cai, X. Cakir, O. Calcaterra, A. Cao, G.F. Cetin, S.A. Chai, J. Chang, J.F. 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. 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. 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. Garzia, I. Goetzen, K. Gong, L. Gong, W.X. Gradl, W. Greco, M. Gu, M.H. Gu, Y.T. Guo, A.Q. Guo, R.P. Guo, Y.P. 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, T. Hu, Y. Huang, G.S. Huang, J.S. 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. Johansson, T. Julin, A. Kalantar-Nayestanaki, N. Kang, X.L. Kang, X.S. Kavatsyuk, M. Ke, B.C. Khan, T. Kiese, P. Kliemt, R. Kloss, B. Kolcu, O.B. Kopf, B. Kornicer, 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, 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. Liang, H. Liang, Y.F. Liang, Y.T. Liao, G.R. Lin, D.X. Liu, B. Liu, B.J. Liu, C.X. 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 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 China Seoul National University Seoul151-747 Korea Republic

We observe the decay ψ(3686) → nn¯ for the first time and measure ψ(3686) → pp¯ with improved accuracy by using 1.07 × 108 ψ(3686) events collected with the BESIII detector. The measured branching fractions are B(ψ(3686) → nn¯) = (3.06 ± 0.06 ± 0.14) × 10−4 and B(ψ(3686) → pp¯) = (3.05 ± 0.02 ± 0.12) × 10−4. Here, the first uncertainties are statistical, and the second ones are systematic. With the hypothesis that the polar angular distributions of the neutron and proton in the center-of-mass system obey 1+α cos2 θ, we determine the α parameters to be αnn¯ = 0.68±0.12±0.11 and αpp¯ = 1.03 ± 0.06 ± 0.03 for ψ(3686) → nn¯ and ψ(3686) → pp¯, respectively. Copyright © 2018, The Authors. All rights reserved.

关键词：

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：