Measurement of e+ e− → Dbar D cross sections at the ψ(3770) resonance*

Chinese Physics C Paper • The following article is OPEN ACCESS Measurement of e+ e− → Dbar D cross sections at the ψ(3770) resonance* M. Ablikim (麦迪娜)1, M. N. Achasov9,71, S. Ahmed14, M. Albrecht4, M. Alekseev60,62, A. Amoroso60,62, F. F. An (安芬芬)1, Q. An (安琪)44,57, Y. Bai (白羽)43, O. Bakina28, R. Baldini Ferroli22, Y. Ban (班勇)36, K. Begzsuren26, D. W. Bennett21, J. V. Bennett5, N. Berger27, M. Bertani22, D. Bettoni24, J. M. Bian (边渐鸣)54, F. Bianchi60,62, E. Boger28,69, I. Boyko28, R. A. Briere5, H. Cai (蔡浩)64, X. Cai (蔡啸)1,44, O. Cakir47, A. Calcaterra22, G. F. Cao (曹国富)1,51, S. A. Cetin48, J. Chai62, J. F. Chang (常劲帆)1,44, W. L. Chang1,51, G. Chelkov28,69,70, G. Chen (陈刚)1, H. S. Chen (陈和生)1,51, J. C. Chen (陈江川)1, M. L. Chen (陈玛丽)1,44, P. L. Chen (陈平亮)58, S. J. Chen (陈申见)34, X. R. Chen (陈旭荣)31, Y. B. Chen (陈元柏)1,44, X. K. Chu (褚新坤)36, G. Cibinetto24, F. Cossio62, H. L. Dai (代洪亮)1,44, J. P. Dai (代建平)39,75, A. Dbeyssi14, D. Dedovich28, Z. Y. Deng (邓子艳)1, A. Denig27, I. Denysenko28, M. Destefanis60,62, F. De Mori60,62, Y. Ding (丁勇)32, C. Dong (董超)35, J. Dong (董静)1,44, L. Y. Dong (董燎原)1,51, M. Y. Dong (董明义)1, Z. L. Dou (豆正磊)34, S. X. Du (杜书先)67, P. F. Duan (段鹏飞)1, J. Fang (方建)1,44, S. S. Fang (房双世)1,51, Y. Fang (方易)1, R. Farinelli24,25, L. Fava61,62, S. Fegan27, F. Feldbauer4, G. Felici22, C. Q. Feng (封常青)44,57, E. Fioravanti24, M. Fritsch4, C. D. Fu (傅成栋)1, Q. Gao (高清)1, X. L. Gao (高鑫磊)44,57, Y. Gao (高原宁)46, Y. G. Gao (高勇贵)6, Z. Gao (高榛)44,57, B. Garillon27, I. Garzia24, A. Gilman54, K. Goetzen10, L. Gong (龚丽)35, W. X. Gong (龚文煊)1,44, W. Gradl27, M. Greco60,62, L. M. Gu (谷立民)34, M. H. Gu (顾旻皓)1,44, Y. T. Gu (顾运厅)12, A. Q. Guo (郭爱强)1, L. B. Guo (郭立波)33, R. P. Guo (郭如盼)1,51, Y. P. Guo (郭玉萍)27, A. Guskov28, Z. Haddadi30, S. Han (韩爽)64, X. Q. Hao (郝喜庆)15, F. A. Harris52, K. L. He (何康林)1,51, X. Q. He (何希勤)56, F. H. Heinsius4, T. Held4, Y. K. Heng (衡月昆)1, T. Holtmann4, Z. L. Hou (侯治龙)1, H. M. Hu (胡海明)1,51, J. F. Hu (胡继峰)39,75, T. Hu (胡涛)1, Y. Hu (胡誉)1, G. S. Huang (黄光顺)44,57, J. S. Huang (黄金书)15, X. T. Huang (黄性涛)38, X. Z. Huang (黄晓忠)34, Z. L. Huang (黄智玲)32, T. Hussain59, W. Ikegami Andersson63, M Irshad44,57, Q. Ji (纪全)1, Q. P. Ji (姬清平)15, X. B. Ji (季晓斌)1,51, X. L. Ji (季筱璐)2, X. S. Jiang (江晓山)1, X. Y. Jiang (蒋兴雨)35, J. B. Jiao (焦健斌)38, Z. Jiao (焦铮)17, D. P. Jin (金大鹏)1, S. Jin (金山)1,51, Y. Jin (金毅)53, T. Johansson63, A. Julin54, N. Kalantar-Nayestanaki30, X. S. Kang (康晓珅)35, M. Kavatsyuk30, B. C. Ke (柯百谦)1, T. Khan44,57, A. Khoukaz55, P. Kiese27, R. Kliemt10, L. Koch29, O. B. Kolcu48,73, B. Kopf4, M. Kornicer52, M. Kuemmel4, M. Kuessner4, A. Kupsc63, M. Kurth1, W. Kuhn29, J. S. Lange29, M. Lara21, P. Larin14, L. Lavezzi62,1, S. Leiber4, H. Leithoff27, C. Li (李翠)63, Cheng Li (李澄)44,57, D. M. Li (李德民)67, F. Li (李飞)1,44, F. Y. Li (李峰云)36, G. Li (李刚)1, H. B. Li (李海波)1,51, H. J. Li (李惠静)1,51, J. C. Li (李家才)1, J. W. Li (李井文)42, K. J. Li (李凯杰)45, Kang Li (李康)13, Ke Li (李科)1, Lei Li (李蕾)3, P. L. Li (李佩莲)44,57, P. R. Li (李培荣)7,51, Q. Y. Li (李启云)38, T. Li (李腾)38, W. D. Li (李卫东)1,51, W. G. Li (李卫国)1, X. L. Li (李晓玲)38, X. N. Li (李小男)1,44, X. Q. Li (李学潜)35, Z. B. Li (李志兵)45, H. Liang (梁昊)44,57, Y. F. Liang (梁勇飞)41, Y. T. Liang (梁羽铁)29, G. R. Liao (廖广睿)11, L. Z. Liao (廖龙洲)1,51, J. Libby20, C. X. Lin (林创新)45, D. X. Lin (林德旭)14, B. Liu (刘冰)39,75, B. J. Liu (刘北江)1, C. X. Liu (刘春秀)1, D. Liu (刘栋)44,57, D. Y. Liu (刘殿宇)39,75, F. H. Liu (刘福虎)40, Fang Liu (刘芳)1, Feng Liu (刘峰)6, H. B. Liu (刘宏邦)12, H. L Liu (刘恒君)43, H. M. Liu (刘怀民)1,51, Huanhuan Liu (刘欢)1, Huihui Liu (刘汇慧)16, J. B. Liu (刘建北)44,57, J. Y. Liu (刘晶译)1,51, K. Liu (刘凯)46, K. Y. Liu (刘魁勇)32, Ke Liu (刘珂)6, L. D. Liu (刘兰雕)36, Q. Liu (刘倩)51, S. B. Liu (刘树彬)44,57, X. Liu (刘翔)31, Y. B. Liu (刘玉斌)35, Z. A. Liu (刘振安)1, Zhiqing Liu (刘智青)27, Y. F. Long (龙云飞)36, X. C. Lou (娄辛犴)1, H. J. Lu (吕海江)17, J. G. Lu (吕军光)1,44, Y. Lu (卢宇)1, Y. P. Lu (卢云鹏)1,44, C. L. Luo (罗成林)33, M. X. Luo (罗民兴)66, X. L. Luo (罗小兰)1,44, S. Lusso62, X. R. Lyu (吕晓睿)51, F. C. Ma (马凤才)32, H. L. Ma (马海龙)1, L. L. 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Article has an altmetric score of 3 Turn on MathJax Share this article Share this content via email Share on Facebook Share on Twitter Share on Google+ Share on CiteULike Share on Mendeley Hide article information Author affiliations 1 Institute of High Energy Physics, Beijing 100049, China 2 Beihang University, Beijing 100191, China 3 Beijing Institute of Petrochemical Technology, Beijing 102617, China 4 Bochum Ruhr-University, D-44780 Bochum, Germany 5 Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA 6 Central China Normal University, Wuhan 430079, China 7 China Center of Advanced Science and Technology, Beijing 100190, China 8 COMSATS Institute of Information Technology, Lahore, Defence Road, Off Raiwind Road, 54000 Lahore, Pakistan 9 G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia 10 GSI Helmholtzcentre for Heavy Ion Research GmbH, D-64291 Darmstadt, Germany 11 Guangxi Normal University, Guilin 541004, China 12 Guangxi University, Nanning 530004, China 13 Hangzhou Normal University, Hangzhou 310036, China 14 Helmholtz Institute Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany 15 Henan Normal University, Xinxiang 453007, China 16 Henan University of Science and Technology, Luoyang 471003, China 17 Huangshan College, Huangshan 245000, China 18 Hunan Normal University, Changsha 410081, China 19 Hunan University, Changsha 410082, China 20 Indian Institute of Technology Madras, Chennai 600036, India 21 Indiana University, Bloomington, Indiana 47405, USA 22 INFN Laboratori Nazionali di Frascati, I-00044, Frascati, Italy 23 INFN and University of Perugia, I-06100, Perugia, Italy 24 INFN Sezione di Ferrara, I-44122, Ferrara, Italy 25 University of Ferrara, I-44122, Ferrara, Italy 26 Institute of Physics and Technology, Peace Ave. 54B, Ulaanbaatar 13330, Mongolia 27 Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany 28 Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia 29 Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany 30 KVI-CART, University of Groningen, NL-9747 AA Groningen, The Netherlands 31 Lanzhou University, Lanzhou 730000, China 32 Liaoning University, Shenyang 110036, China 33 Nanjing Normal University, Nanjing 210023, China 34 Nanjing University, Nanjing 210093, China 35 Nankai University, Tianjin 300071, China 36 Peking University, Beijing 100871, China 37 Seoul National University, Seoul, 151-747, Korea 38 Shandong University, Jinan 250100, China 39 Shanghai Jiao Tong University, Shanghai 200240, China 40 Shanxi University, Taiyuan 030006, China 41 Sichuan University, Chengdu 610064, China 42 Soochow University, Suzhou 215006, China 43 Southeast University, Nanjing 211100, China 44 State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, China 45 Sun Yat-Sen University, Guangzhou 510275, China 46 Tsinghua University, Beijing 100084, China 47 Ankara University, 06100 Tandogan, Ankara, Turkey 48 Istanbul Bilgi University, 34060 Eyup, Istanbul, Turkey 49 Uludag University, 16059 Bursa, Turkey 50 Near East University, Nicosia, North Cyprus, Mersin 10, Turkey 51 University of Chinese Academy of Sciences, Beijing 100049, China 52 University of Hawaii, Honolulu, Hawaii 96822, USA 53 University of Jinan, Jinan 250022, China 54 University of Minnesota, Minneapolis, Minnesota 55455, USA 55 University of Muenster, Wilhelm-Klemm-Str. 9, 48149 Muenster, Germany 56 University of Science and Technology Liaoning, Anshan 114051, China 57 University of Science and Technology of China, Hefei 230026, China 58 University of South China, Hengyang 421001, China 59 University of the Punjab, Lahore-54590, Pakistan 60 University of Turin, I-10125, Turin, Italy 61 University of Eastern Piedmont, I-15121, Alessandria, Italy 62 INFN, I-10125, Turin, Italy 63 Uppsala University, Box 516, SE-75120 Uppsala, Sweden 64 Wuhan University, Wuhan 430072, China 65 Xinyang Normal University, Xinyang 464000, China 66 Zhejiang University, Hangzhou 310027, China 67 Zhengzhou University, Zhengzhou 450001, China 68 Also at Bogazici University, 34342 Istanbul, Turkey 69 Also at the Moscow Institute of Physics and Technology, Moscow 141700, Russia 70 Also at the Functional Electronics Laboratory, Tomsk State University, Tomsk, 634050, Russia 71 Also at the Novosibirsk State University, Novosibirsk, 630090, Russia 72 Also at the NRC "Kurchatov Institute", PNPI, 188300, Gatchina, Russia 73 Also at Istanbul Arel University, 34295 Istanbul, Turkey 74 Also at Goethe University Frankfurt, 60323 Frankfurt am Main, Germany 75 Also at Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education; Shanghai Key Laboratory for Particle Physics and Cosmology; Institute of Nuclear and Particle Physics, Shanghai 200240, China 76 Also at Government College Women University, Sialkot - 51310. Punjab, Pakistan 77 Currently at: Center for Underground Physics, Institute for Basic Science, Daejeon 34126, Korea Dates Received 17 March 2018 Citation M. Ablikim et al 2018 Chinese Phys. C 42 083001 Create citation alert DOI https://doi.org/10.1088/1674-1137/42/8/083001 E-print http://arxiv.org/abs/1803.06293 Journal RSS feed Sign up for new issue notifications Abstract We report new measurements of the cross sections for the production of Dbar D final states at the ψ(3770) resonance. Our data sample consists of an integrated luminosity of 2.93 fb−1 of e+e− annihilation data produced by the BEPCII collider and collected and analyzed with the BESIII detector. We exclusively reconstruct three D0 and six D+ hadronic decay modes and use the ratio of the yield of fully reconstructed Dbar D events ("double tags") to the yield of all reconstructed D or bar D mesons ("single tags") to determine the number of D0bar D0 and D+D− events, benefiting from the cancellation of many systematic uncertainties. Combining these yields with an independent determination of the integrated luminosity of the data sample, we find the cross sections to be σ(e+e− → D0bar D0) nb and σ(e+e− → D+D−) = (2.830 ± 0.011 ± 0.026) nb, where the uncertainties are statistical and systematic, respectively. Chinese Physics C Paper • The following article is OPEN ACCESS Measurement of e+ e− → Dbar D cross sections at the ψ(3770) resonance* M. Ablikim (麦迪娜)1, M. N. Achasov9,71, S. Ahmed14, M. Albrecht4, M. Alekseev60,62, A. Amoroso60,62, F. F. An (安芬芬)1, Q. An (安琪)44,57, Y. Bai (白羽)43, O. Bakina28, R. Baldini Ferroli22, Y. Ban (班勇)36, K. Begzsuren26, D. W. Bennett21, J. V. Bennett5, N. Berger27, M. Bertani22, D. Bettoni24, J. M. Bian (边渐鸣)54, F. Bianchi60,62, E. Boger28,69, I. Boyko28, R. A. Briere5, H. Cai (蔡浩)64, X. Cai (蔡啸)1,44, O. Cakir47, A. Calcaterra22, G. F. Cao (曹国富)1,51, S. A. Cetin48, J. Chai62, J. F. Chang (常劲帆)1,44, W. L. Chang1,51, G. Chelkov28,69,70, G. Chen (陈刚)1, H. S. Chen (陈和生)1,51, J. C. Chen (陈江川)1, M. L. Chen (陈玛丽)1,44, P. L. Chen (陈平亮)58, S. J. Chen (陈申见)34, X. R. Chen (陈旭荣)31, Y. B. Chen (陈元柏)1,44, X. K. Chu (褚新坤)36, G. Cibinetto24, F. Cossio62, H. L. Dai (代洪亮)1,44, J. P. Dai (代建平)39,75, A. Dbeyssi14, D. Dedovich28, Z. Y. Deng (邓子艳)1, A. Denig27, I. Denysenko28, M. Destefanis60,62, F. De Mori60,62, Y. Ding (丁勇)32, C. Dong (董超)35, J. Dong (董静)1,44, L. Y. Dong (董燎原)1,51, M. Y. Dong (董明义)1, Z. L. Dou (豆正磊)34, S. X. Du (杜书先)67, P. F. Duan (段鹏飞)1, J. Fang (方建)1,44, S. S. Fang (房双世)1,51, Y. Fang (方易)1, R. Farinelli24,25, L. Fava61,62, S. Fegan27, F. Feldbauer4, G. Felici22, C. Q. Feng (封常青)44,57, E. Fioravanti24, M. Fritsch4, C. D. Fu (傅成栋)1, Q. Gao (高清)1, X. L. Gao (高鑫磊)44,57, Y. Gao (高原宁)46, Y. G. Gao (高勇贵)6, Z. Gao (高榛)44,57, B. Garillon27, I. Garzia24, A. Gilman54, K. Goetzen10, L. Gong (龚丽)35, W. X. Gong (龚文煊)1,44, W. Gradl27, M. Greco60,62, L. M. Gu (谷立民)34, M. H. Gu (顾旻皓)1,44, Y. T. Gu (顾运厅)12, A. Q. Guo (郭爱强)1, L. B. Guo (郭立波)33, R. P. Guo (郭如盼)1,51, Y. P. Guo (郭玉萍)27, A. Guskov28, Z. Haddadi30, S. Han (韩爽)64, X. Q. Hao (郝喜庆)15, F. A. Harris52, K. L. He (何康林)1,51, X. Q. He (何希勤)56, F. H. Heinsius4, T. Held4, Y. K. Heng (衡月昆)1, T. Holtmann4, Z. L. Hou (侯治龙)1, H. M. Hu (胡海明)1,51, J. F. Hu (胡继峰)39,75, T. Hu (胡涛)1, Y. Hu (胡誉)1, G. S. Huang (黄光顺)44,57, J. S. Huang (黄金书)15, X. T. Huang (黄性涛)38, X. Z. Huang (黄晓忠)34, Z. L. Huang (黄智玲)32, T. Hussain59, W. Ikegami Andersson63, M Irshad44,57, Q. Ji (纪全)1, Q. P. Ji (姬清平)15, X. B. Ji (季晓斌)1,51, X. L. Ji (季筱璐)2, X. S. Jiang (江晓山)1, X. Y. Jiang (蒋兴雨)35, J. B. Jiao (焦健斌)38, Z. Jiao (焦铮)17, D. P. Jin (金大鹏)1, S. Jin (金山)1,51, Y. Jin (金毅)53, T. Johansson63, A. Julin54, N. Kalantar-Nayestanaki30, X. S. Kang (康晓珅)35, M. Kavatsyuk30, B. C. Ke (柯百谦)1, T. Khan44,57, A. Khoukaz55, P. Kiese27, R. Kliemt10, L. Koch29, O. B. Kolcu48,73, B. Kopf4, M. Kornicer52, M. Kuemmel4, M. Kuessner4, A. Kupsc63, M. Kurth1, W. Kuhn29, J. S. Lange29, M. Lara21, P. Larin14, L. Lavezzi62,1, S. Leiber4, H. Leithoff27, C. Li (李翠)63, Cheng Li (李澄)44,57, D. M. Li (李德民)67, F. Li (李飞)1,44, F. Y. Li (李峰云)36, G. Li (李刚)1, H. B. Li (李海波)1,51, H. J. Li (李惠静)1,51, J. C. Li (李家才)1, J. W. Li (李井文)42, K. J. Li (李凯杰)45, Kang Li (李康)13, Ke Li (李科)1, Lei Li (李蕾)3, P. L. Li (李佩莲)44,57, P. R. Li (李培荣)7,51, Q. Y. Li (李启云)38, T. Li (李腾)38, W. D. Li (李卫东)1,51, W. G. Li (李卫国)1, X. L. Li (李晓玲)38, X. N. Li (李小男)1,44, X. Q. Li (李学潜)35, Z. B. Li (李志兵)45, H. Liang (梁昊)44,57, Y. F. Liang (梁勇飞)41, Y. T. Liang (梁羽铁)29, G. R. Liao (廖广睿)11, L. Z. Liao (廖龙洲)1,51, J. Libby20, C. X. Lin (林创新)45, D. X. Lin (林德旭)14, B. Liu (刘冰)39,75, B. J. Liu (刘北江)1, C. X. Liu (刘春秀)1, D. Liu (刘栋)44,57, D. Y. Liu (刘殿宇)39,75, F. H. Liu (刘福虎)40, Fang Liu (刘芳)1, Feng Liu (刘峰)6, H. B. Liu (刘宏邦)12, H. L Liu (刘恒君)43, H. M. Liu (刘怀民)1,51, Huanhuan Liu (刘欢)1, Huihui Liu (刘汇慧)16, J. B. Liu (刘建北)44,57, J. Y. Liu (刘晶译)1,51, K. Liu (刘凯)46, K. Y. Liu (刘魁勇)32, Ke Liu (刘珂)6, L. D. Liu (刘兰雕)36, Q. Liu (刘倩)51, S. B. Liu (刘树彬)44,57, X. Liu (刘翔)31, Y. B. Liu (刘玉斌)35, Z. A. Liu (刘振安)1, Zhiqing Liu (刘智青)27, Y. F. Long (龙云飞)36, X. C. Lou (娄辛犴)1, H. J. Lu (吕海江)17, J. G. Lu (吕军光)1,44, Y. Lu (卢宇)1, Y. P. Lu (卢云鹏)1,44, C. L. Luo (罗成林)33, M. X. Luo (罗民兴)66, X. L. Luo (罗小兰)1,44, S. Lusso62, X. R. Lyu (吕晓睿)51, F. C. Ma (马凤才)32, H. L. Ma (马海龙)1, L. L. Ma (马连良)38, M. M. Ma (马明明)1,51, Q. M. Ma (马秋梅)1, X. N. Ma (马旭宁)35, X. Y. Ma (马骁妍)1,44, Y. M. Ma (马玉明)38, F. E. Maas14, M. Maggiora60,62, Q. A. Malik59, A. Mangoni23, Y. J. Mao (冒亚军)36, Z. P. Mao (毛泽普)1, S. Marcello60,62, Z. X. Meng (孟召霞)53, J. G. Messchendorp30, G. Mezzadri24, J. Min (闵建)1,44, T. J. Min (闵天觉)1, R. E. Mitchell21, X. H. Mo (莫晓虎)1, Y. J. Mo (莫玉俊)6, C. Morales Morales14, G. Morello22, N. Yu. Muchnoi9,71, H. Muramatsu (村松創)54, A. Mustafa4, S. Nakhoul10,74, Y. Nefedov28, F. Nerling10, I. B. Nikolaev9,71, Z. Ning (宁哲)1,44, S. Nisar8, S. L. Niu (牛顺利)1,44, X. Y. Niu (牛讯伊)1,51, S. L. Olsen (馬鵬)37,77, Q. Ouyang (欧阳群)1, S. Pacetti23, Y. Pan (潘越)44,57, M. Papenbrock63, P. Patteri22, M. Pelizaeus4, J. Pellegrino60,62, H. P. Peng (彭海平)44,57, Z. Y. Peng (彭志远)12, K. Peters10,74, J. Pettersson63, J. L. Ping (平加伦)33, R. G. Ping (平荣刚)1,51, A. Pitka4, R. Poling54, V. Prasad44,57, H. R. Qi (漆红荣)2, M. Qi (祁鸣)34, T. Y. Qi (齐天钰)2, S. Qian (钱森)1,44, C. F. Qiao (乔从丰)51, N. Qin (覃拈)64, X. S. Qin4, Z. H. Qin (秦中华)1,44, J. F. Qiu (邱进发)1, K. H. Rashid59,76, C. F. Redmer27, M. Richter4, M. Ripka27, M. Rolo62, G. Rong (荣刚)1,51, Ch. Rosner14, X. D. Ruan (阮向东)12, A. Sarantsev28,72, M. Savrie25, C. Schnier4, K. Schoenning63, W. Shan (单葳)18, X. Y. Shan (单心钰)44,57, M. Shao (邵明)44,57, C. P. Shen (沈成平)2, P. X. Shen (沈培迅)35, X. Y. Shen (沈肖雁)1,51, H. Y. Sheng (盛华义)1, X. Shi (史欣)1,44, J. J. Song (宋娇娇)38, W. M. Song38, X. Y. Song (宋欣颖)1, S. Sosio60,62, C. Sowa4, S. Spataro60,62, G. X. Sun (孙功星)1, J. F. Sun (孙俊峰)15, L. Sun (孙亮)64, S. S. Sun (孙胜森)1,51, X. H. Sun (孙新华)1, Y. J. Sun (孙勇杰)44,57, Y. K Sun (孙艳坤)44,57, Y. Z. Sun (孙永昭)1, Z. J. Sun (孙志嘉)1,44, Z. T. Sun (孙振田)21, Y. T Tan (谭雅星)44,57, C. J. Tang (唐昌建)41, G. Y. Tang (唐光毅)1, X. Tang (唐晓)1, I. Tapan49, M. Tiemens30, D. Toth54, B. Tsednee26, I. Uman50, G. S. Varner52, B. Wang (王斌)1, B. L. Wang (王滨龙)51, C. W. Wang (王成伟)34, D. Wang (王东)36, D. Y. Wang (王大勇)36, Dan Wang (王丹)51, K. Wang (王科)1,44, L. L. Wang (王亮亮)1, L. S. Wang (王灵淑)1, M. Wang (王萌)38, Meng Wang (王蒙)1,51, P. Wang (王平)1, P. L. Wang (王佩良)1, W. P. Wang (王维平)44,57, X. F. Wang (王雄飞)1, Y. Wang (王越)44,57, Y. F. Wang (王贻芳)27, Y. Q. Wang (王亚乾)27, Z. Wang (王铮)1,44, Z. G. Wang (王志刚)1,44, Z. Y. Wang (王至勇)1, Zongyuan Wang (王宗源)1,51, T. Weber4, D. H. Wei (魏代会)11, P. Weidenkaff27, S. P. Wen (文硕频)1, U. Wiedner4, M. Wolke63, L. H. Wu (伍灵慧)1, L. J. Wu (吴连近)1,51, Z. Wu (吴智)1,44, L. Xia (夏磊)44,57, X. Xia38, Y. Xia (夏宇)19, D. Xiao (肖栋)1, Y. J. Xiao (肖言佳)1,51, Z. J. Xiao (肖振军)33, Y. G. Xie (谢宇广)1,44, Y. H. Xie (谢跃红)6, X. A. Xiong (熊习安)1,51, Q. L. Xiu (修青磊)1,44, G. F. Xu (许国发)1, J. J. Xu (徐静静)1,51, L. Xu (徐雷)1, Q. J. Xu (徐庆君)13, Q. N. Xu (徐庆年)51, X. P. Xu (徐新平)42, F. Yan (严芳)58, L. Yan (严亮)60,62, W. B. Yan (鄢文标)44,57, W. C. Yan (闰文成)2, Y. H. Yan (颜永红)19, H. J. Yang (杨海军)39,75, H. X. Yang (杨洪勋)1, L. Yang (杨柳)64, S. L. Yang (杨双莉)1,51, Y. H. Yang (杨友华)

Gli ancetres del Roman de Tristan in prosa. Studio e saggio di edizione (ms. Paris, BnF, fr. 756, cc.1-21)

Il presente studio consiste nell'esame ravvicinato di un manoscritto inedito riportante il testo del Roman de Tristan in prosa, il ms. Paris, BnF, fr. 756. A seguito di un'attenta analisi della tradizione, del testimone in questione e di altri manoscritti affini, abbiamo deciso di fornire la trascrizione della sezione iniziale del testo, quella relativa agli ancêtres di Tristano, comprendente i paragrafi §§1-19 individuati da Löseth nella sua Analyse del 1891. Nella parte introduttiva di questa dissertazione ci siamo dedicati a inquadrare le problematiche inerenti alla tradizione del romanzo attraverso l'esposizione della teoria secondo la quale esistono due principali “versioni” del Tristan: V.I, più antica e breve e V.II, ciclica e interpolata con episodi della Queste. In un secondo momento, e cercando di approfondire la questione relativa all'esistenza di V.I e V.II, ci siamo interrogati su chi potesse essere stato l'autore (o gli autori) del romanzo. Dopo aver riportato la lista completa e aggiornata agli studi più recenti dei manoscritti e frammenti riportanti il Roman de Tristan in prosa, abbiamo focalizzato sempre più l'attenzione sul testimone da noi preso in esame. Passando attraverso l'illustrazione della circolazione italiana del romanzo, per meglio inquadrare la problematica relativa al fr. 756, fin dai primi studi ritenuto di provenienza italiana, abbiamo cercato di determinare la posizione del manoscritto all'interno della complicata tradizione tristaniana attraverso la formulazione di un'ipotesi di collocazione della storia degli antenati di Tristano. Nel realizzare l'edizione del testo, abbiamo proceduto a un'accurata descrizione della fisionomia del codice, corredata da una tabella contenente tutti i segni tachigrafici incontrati nella porzione di testo da noi presa in esame. In seguito alla realizzazione di una scrupolosa nota linguistica, elaborata tenendo conto delle osservazioni fatte a proposito del manoscritto “gemello”, il fr. 757, edito a cura di Ménard in 5 Voll. tra il 1997 e il 2007, abbiamo provato a formulare delle congetture relative alla collocazione geografica del testimone, cercando di capire se sia ancora plausibile ritenerlo afferente all'area napoletana. Dopo aver esposto le motivazioni per cui siamo giunti alla scelta dei testimoni per la collatio, abbiamo proceduto a uno studio rigoroso delle varianti, il risultato del quale è stato riportato nel paragrafo che segue l'edizione del testo. La realizzazione di una sezione conclusiva di note al testo, in cui sono state discusse le lezioni più controverse, ci ha infine aiutato a proporre delle ipotesi di posizionamento, familiarità e interdipendenze tra i testimoni presi in analisi. Numerose sono le questioni che si sono sollevate procedendo nella nostra analisi: il ms. Paris, BnF, fr. 756 è afferente a V.II, come ha ritenuto a suo tempo Löseth, o è più corretto parlare di V.I per la coppia di manoscritti rappresentata da fr. 756-757? il codice è stato esemplato con certezza in Italia o è possibile proporre una collocazione alternativa? è vero che, come ha ritenuto Curtis nella sua Introduzione all'edizione del Vol. I del Tristan, il fr. 756 riporta una versione abregée e insoddisfacente del romanzo? Attraverso un nuovo studio del manoscritto, della lingua del copista e delle varianti scaturite dalla collatio, abbiamo cercato di formulare nuove congetture dalle quali poter prendere spunto, in un prossimo futuro, nel tentativo di fare chiarezza all'interno della complessa tradizione di questo discusso romanzo arturiano

Study of ψ (3686) → Λ Λ ¯ ω

Based on a data sample of (448.1±2.9)×106 ψ(3686) events collected with the BESIII detector at the BEPCII collider, the branching fraction of ψ(3686)→ΛΛ¯ω is measured to be (3.30±0.34(stat)±0.29(syst))×10-5 for the first time. In addition, the Λω (or Λ¯ω) invariant mass spectra is studied and the potential presence of excited Λ states has been investigated

Measurements and simulations of single-event upsets in a 28-nm FPGA

Single-event upsets in the configuration memory of the 28-nm Xilinx Kintex-7 FPGA, used in the PANDA electromagnetic calorimeter, have been studied. Results from neutron and proton irradiations at energies up to 184 MeV are presented and compared with previous experimental results. In order to gain information about the energy-dependence of the single-event upset cross section, a GEANT4-based Monte Carlo simulation of upset mechanisms in nanometric silicon volumes has been developed. The results from this model are shown to agree with the experimental data for both neutrons and protons. Knowledge about the energy dependence of the cross section and of the particle flux at the location of the front-end modules in PANDA enables better estimates of the mean time between failures in the electromagnetic calorimeter. At PANDA, a total neutron flux of 1·102 cm− 2 s− 1 at the location of the front-end modules is expected at the lowest antipro-ton beam momentum and a luminosity of 1·1031 cm− 2 s− 1, leading to a predicted Mean Time Between Failures of 47±10 hours per FPGA in the electromagnetic calorimeter

Proton-and Neutron-Induced Single-Event Upsets in FPGAs for the PANDA Experiment

Single-event upsets (SEUs) affecting the configuration memory of a 28-nm field-programmable gate array (FPGA) have been studied through experiments and Monte Carlo modeling. This FPGA will be used in the front-end electronics of the electromagnetic calorimeter in PANDA (Antiproton Annihilation at Darmstadt), an upcoming hadron-physics experiment. Results from proton and neutron irradiations of the FPGA are presented and shown to be in agreement with previous experimental results. To estimate the mean time between SEUs during operation of PANDA, a Geant4-based Monte Carlo model of the phenomenon has been used. This model describes the energy deposition by particles in a silicon volume, the subsequent drift and diffusion of charges in the FPGA memory cell, and the eventual collection of charges in the sensitive regions of the cell. The values of the two free parameters of the model, the sensitive volume side d = 87 nm and the critical charge Qcrit = 0.23 fC, were determined by fitting the model to the experimental data. The results of the model agree well with both the proton and neutron data and are also shown to correctly predict the cross sections for upsets induced by other particles. The model-predicted energy dependence of the cross section for neutron-induced upsets has been used to estimate the rate of SEUs during initial operation of PANDA. At a luminosity of 1&amp;cdot; 1031 cm-2s-1, the predicted mean time between upsets (MTBU) is between 120 and 170 h per FPGA, depending on the beam momentum.</p

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

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→Vη 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 be B(ω→invisible)B(ω→π+π−π0)<8.1×10−5 and B(ϕ→invisible)B(ϕ→K+K−)<3.4×10−4. 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)<7.3×10−5 and B(ϕ→invisible)<1.7×10−4, respectively

Measurement of the Branching Fraction For the Semileptonic Decay D0(+) -&gt; pi(-(0))mu(+)nu(mu )and Test of Lepton Flavor Universality

Using a data sample corresponding to an integrated luminosity of 2.93 fb(-1) taken at a center-of-mass energy of 3.773 GeV with the BESIII detector operated at the BEPCII collider, we perform an analysis of the semileptonic decays D0(+) -> pi(-(0))mu(+)nu(mu ). The branching fractions of D-0 -> pi(-)mu(+)nu(mu), and D+ -> pi(0)mu(+)nu(mu ) are measured to be (0.272 +/- 0.008(start) +/- 0.006(syst))% and (0.350 +/- 0.011(star) +/- 0.010(syst))%, respectively, where the former is of much improved precision compared to previous results and the latter is determined for the first time. Using these results along with previous BESIII measurements of D0(+) -> pi(-(0))e(+)nu(e), we calculate the branching fraction ratios to be R-0 BD0 -> pi(-)mu(+)nu mu BD0 -> pi(-)e(+)nu e=0.922 +/- 0.030(start) +/- 0.022(syst) and R+ BD+ -> pi(0)mu(+)nu mu/BD+ -> pi(0)e(+)nu e= 0.964 +/- 0.037(start) +/- 0.026(syst), which arc compatible with the theoretical expectation of lepton flavor universality within 1.7 sigma and 0.5 sigma, respectively. We also examine the branching fraction ratios in different four-momentum transfer square regions, and find no significant deviations from the standard model predictions

Search for a CP-odd light Higgs boson in J/ψ →γA⁰

Using J/ψ radiative decays from 9.0 billion J/ψ events collected by the BESIII detector, we search for di-muon decays of a CP-odd light Higgs boson (A0), predicted by many new physics models beyond the Standard Model, including the next-to-minimal supersymmetric Standard Model. No evidence for the CP-odd light Higgs production is found, and we set 90% confidence level upper limits on the product branching fraction B(J/ψ→γA0)×B(A0→μ+μ-) in the range of (1.2-778.0)×10-9 for 0.212≤mA0≤3.0 GeV/c2. The new measurement is a 6-7 times improvement over our previous measurement, and is also slightly better than the BABAR measurement in the low-mass region for tanβ=1

Partial wave analysis of ψ(3686) → K⁺K⁻η

Using a sample of (448.1±2.9)×106 ψ(3686) events collected with the BESIII detector, we perform the first partial wave analysis of ψ(3686)→K+K-η. In addition to the well established states, φ(1020), φ(1680), and K3∗(1780), contributions from X(1750), ρ(2150), ρ3(2250), and K2∗(1980) are also observed. The X(1750) state is determined to be a 1-resonance. The simultaneous observation of the φ(1680) and X(1750) indicates that the X(1750), with previous observations in photoproduction, is distinct from the φ(1680). The masses, widths, branching fractions of ψ(3686)→K+K-η, and the intermediate resonances are also measured