Study of J/ψ → p(p)over-bar and J/ψ → n(n)over-bar

被引：35

作者：

Ablikim, M. ^{[1
]}

Achasov, M. N. ^{[5
]}

Ambrose, D. J. ^{[40
]}

An, F. F. ^{[1
]}

An, Q. ^{[41
]}

An, Z. H. ^{[1
]}

Bai, J. Z. ^{[1
]}

Ban, Y. ^{[27
]}

Becker, J. ^{[2
]}

Berger, N. ^{[1
]}

Bertani, M. ^{[18
]}

Bian, J. M. ^{[39
]}

Boger, E. ^{[20
,49
]}

Bondarenko, O. ^{[21
]}

Boyko, I. ^{[20
]}

Briere, R. A. ^{[3
]}

Bytev, V. ^{[20
]}

Cai, X. ^{[1
]}

Calcaterra, A. ^{[18
]}

Cao, G. F. ^{[1
]}

Chang, J. F. ^{[1
]}

Chelkov, G. ^{[20
,49
]}

Chen, G. ^{[1
]}

Chen, H. S. ^{[1
]}

Chen, J. C. ^{[1
]}

Chen, M. L. ^{[1
]}

Chen, S. J. ^{[25
]}

Chen, Y. ^{[1
]}

Chen, Y. B. ^{[1
]}

Cheng, H. P. ^{[14
]}

Chu, Y. P. ^{[1
]}

Cronin-Hennessy, D. ^{[39
]}

Dai, H. L. ^{[1
]}

Dai, J. P. ^{[1
]}

Dedovich, D. ^{[20
]}

Deng, Z. Y. ^{[1
]}

Denig, A. ^{[19
]}

Denysenko, I. ^{[20
]}

Destefanis, M. ^{[44
,45
]}

Ding, W. M. ^{[29
]}

Ding, Y. ^{[23
]}

Dong, L. Y. ^{[1
]}

Dong, M. Y. ^{[1
]}

Du, S. X. ^{[48
]}

Fang, J. ^{[1
]}

Fang, S. S. ^{[1
]}

Fava, L. ^{[44
,45
]}

Feldbauer, F. ^{[2
]}

Feng, C. Q. ^{[41
]}

Ferroli, R. B. ^{[18
]}

机构：

[1] Inst High Energy Phys, Beijing 100049, Peoples R China

[2] Ruhr Univ Bochum, D-44780 Bochum, Germany

[3] Carnegie Mellon Univ, Pittsburgh, PA 15213 USA

[4] China Ctr Adv Sci & Technol, Beijing 100190, Peoples R China

[5] GI Budker Inst Nucl Phys SB RAS BINP, Novosibirsk 630090, Russia

[6] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

[7] GSI Helmholtzctr Heavy Ion Res GmbH, D-64291 Darmstadt, Germany

[8] Guangxi Normal Univ, Guilin 541004, Peoples R China

[9] Guangxi Univ, Nanning 530004, Peoples R China

[10] Hangzhou Normal Univ, Hangzhou 310036, Zhejiang, Peoples R China

[11] Helmholtz Inst Mainz, D-55099 Mainz, Germany

[12] Henan Normal Univ, Xinxiang 453007, Peoples R China

[13] Henan Univ Sci & Technol, Luoyang 471003, Peoples R China

[14] Huangshan Coll, Huangshan 245000, Peoples R China

[15] Huazhong Normal Univ, Wuhan 430079, Peoples R China

[16] Hunan Univ, Changsha 410082, Hunan, Peoples R China

[17] Indiana Univ, Bloomington, IN 47405 USA

[18] Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy

[19] Johannes Gutenberg Univ Mainz, D-55099 Mainz, Germany

[20] Joint Inst Nucl Res, Dubna 141980, Russia

[21] Univ Groningen, KVI, NL-9747 AA Groningen, Netherlands

[22] Lanzhou Univ, Lanzhou 730000, Peoples R China

[23] Liaoning Univ, Shenyang 110036, Peoples R China

[24] Nanjing Normal Univ, Nanjing 210046, Jiangsu, Peoples R China

[25] Nanjing Univ, Nanjing 210093, Jiangsu, Peoples R China

[26] Nankai Univ, Tianjin 300071, Peoples R China

[27] Peking Univ, Beijing 100871, Peoples R China

[28] Seoul Natl Univ, Seoul 151747, South Korea

[29] Shandong Univ, Jinan 250100, Peoples R China

[30] Shanxi Univ, Taiyuan 030006, Peoples R China

[31] Sichuan Univ, Chengdu 610064, Peoples R China

[32] Soochow Univ, Suzhou 215006, Peoples R China

[33] Sun Yat Sen Univ, Guangzhou 510275, Guangdong, Peoples R China

[34] Chinese Univ Hong Kong, Shatin, Hong Kong, Peoples R China

[35] Univ Hong Kong, Pokfulam, Hong Kong, Peoples R China

[36] Tsinghua Univ, Beijing 100084, Peoples R China

[37] Univ Giessen, D-35392 Giessen, Germany

[38] Univ Hawaii, Honolulu, HI 96822 USA

[39] Univ Minnesota, Minneapolis, MN 55455 USA

[40] Univ Rochester, Rochester, NY 14627 USA

[41] Univ Sci & Technol China, Hefei 230026, Peoples R China

[42] Univ S China, Hengyang 421001, Peoples R China

[43] Univ Punjab, Lahore 54590, Pakistan

[44] Univ Turin, Turin, Italy

[45] Ist Nazl Fis Nucl, I-10125 Turin, Italy

[46] Wuhan Univ, Wuhan 430072, Peoples R China

[47] Zhejiang Univ, Hangzhou 310027, Peoples R China

[48] Zhengzhou Univ, Zhengzhou 450001, Peoples R China

[49] Moscow Inst Phys & Technol, Moscow, Russia

[50] PNPI, Gatchina, Russia

来源：

PHYSICAL REVIEW D | 2012年 / 86卷 / 03期

基金：

中国国家自然科学基金; 美国国家科学基金会; 新加坡国家研究基金会;

关键词：

ELECTROMAGNETIC FORM-FACTORS; NUCLEON; DECAYS; PHASE; QCD;

D O I：

10.1103/PhysRevD.86.032014

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The decays J/psi -> p (p) over bar and J/psi -> n (n) over bar have been investigated with a sample of 225.2 x 10(6) J/psi events collected with the BESIII detector at the BEPCII e(+)e(-) collider. The branching fractions are determined to be B(J/psi -> p (p) over bar) = (2.112 +/- 0.004 +/- 0.031 x 10(-3) and B(J/psi -> n (n) over bar) =(2.07 +/- 0.01 +/- 0.17) x 10(-3). Distributions of the angle theta between the proton or antineutron and the beam direction are well described by the form 1 + alpha cos(2)theta, and we find alpha = 0.595 +/- 0.012 +/- 0.015 for J/psi -> p (p) over bar and alpha = 0.50 +/- 0.04 +/- 0.21 for J/psi -> n (n) over bar. Our branching- fraction results suggest a large phase angle between the strong and electromagnetic amplitudes describing the J/psi -> N (N) over bar decay.

引用

页数：13

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