Precision Measurement of the Decay Σ+ → pγ in the Process J/ψ→ Σ+(Σ)over-bar-

被引：4

作者：

Ablikim, M. ^{[1
]}

Achasov, M. N. ^{[12
,84
]}

Adlarson, P. ^{[77
]}

Albrecht, M. ^{[4
]}

Aliberti, R. ^{[35
]}

Amoroso, A. ^{[50
,76
]}

An, M. R. ^{[39
]}

An, Q. ^{[57
,70
]}

Bai, Y. ^{[55
,56
]}

Bakina, O. ^{[36
]}

Ferroli, R. Baldini ^{[26
]}

Balossino, I. ^{[29
]}

Ban, Y. ^{[46
,92
]}

Batozskaya, V. ^{[1
,44
]}

Becker, D. ^{[35
]}

Begzsuren, K. ^{[32
]}

Berger, N. ^{[35
]}

Bertani, M. ^{[26
]}

Bettoni, D. ^{[29
]}

Bianchi, F. ^{[73
,74
,76
]}

Bianco, E. ^{[73
,74
,76
]}

Bloms, J. ^{[67
]}

Bortone, A. ^{[73
,74
,76
]}

Boyko, I. ^{[36
]}

Briere, R. A. ^{[5
]}

Brueggemann, A. ^{[67
]}

Cai, H. ^{[78
]}

Cai, X. ^{[1
,57
]}

Calcaterra, A. ^{[26
]}

Cao, G. F. ^{[1
,62
]}

Cao, N. ^{[1
,62
]}

Cetin, S. A. ^{[61
]}

Chang, J. F. ^{[1
,57
]}

Chang, W. L. ^{[1
,62
]}

Che, G. R. ^{[43
]}

Chelkov, G. ^{[36
,83
]}

Chen, C. ^{[43
]}

Chen, Chao ^{[54
]}

Chen, G. ^{[1
]}

Chen, H. S. ^{[1
,62
]}

Chen, M. L. ^{[1
,57
]}

Chen, S. J. ^{[42
]}

Chen, S. M. ^{[60
]}

Chen, T. ^{[1
,62
]}

Chen, X. R. ^{[31
,62
]}

Chen, X. T. ^{[1
,62
]}

Chen, Y. B. ^{[1
,57
]}

Chen, Z. J. ^{[23
,93
]}

Cheng, W. S. ^{[76
]}

Choi, S. K. ^{[54
]}

机构：

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

[2] Beihang Univ, Beijing 100191, Peoples R China

[3] Beijing Inst Petrochem Technol, Beijing 102617, Peoples R China

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

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

[6] Cent China Normal Univ, Wuhan 430079, Peoples R China

[7] Cent South Univ, Changsha 410083, Peoples R China

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

[9] China Univ Geosci, Wuhan 430074, Peoples R China

[10] COMSATS Univ Islamabad, Lahore Campus,Def Rd,Off Raiwind Rd, Lahore 54000, Pakistan

[11] Fudan Univ, Shanghai 200433, Peoples R China

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

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

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

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

[16] Hangzhou Normal Univ, Hangzhou 310036, Peoples R China

[17] Hebei Univ, Baoding 071002, Peoples R China

[18] Helmholtz Inst Mainz, Staudinger Weg 18, D-55099 Mainz, Germany

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

[20] Henan Univ Technol, Zhengzhou 450001, Peoples R China

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

[22] Hunan Normal Univ, Changsha 410081, Peoples R China

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

[24] Indian Inst Technol Madras, Chennai 600036, Tamil Nadu, India

[25] Indiana Univ, Bloomington, IN 47405 USA

[26] INFN Lab Nazl Frascati, I-00044 Frascati, Italy

[27] INFN, Sez Perugia, I-06100 Perugia, Italy

[28] Univ Perugia, I-06100 Perugia, Italy

[29] INFN, Sez Ferrara, I-44122 Ferrara, Italy

[30] Univ Ferrara, I-44122 Ferrara, Italy

[31] Inst Modern Phys, Lanzhou 730000, Peoples R China

[32] Inst Phys & Technol, Peace Ave 54B, Ulaanbaatar 13330, Mongolia

[33] Univ Tarapaca, Inst Alta Invest, Casilla 7D, Arica 1000000, Chile

[34] Jilin Univ, Changchun 130012, Peoples R China

[35] Johannes Gutenberg Univ Mainz, Johann Joachim Becher Weg 45, D-55099 Mainz, Germany

[36] Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia

[37] Justus Liebig Univ Giessen, Phys Inst 2, Heinrich Buff Ring 16, D-35392 Giessen, Germany

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

[39] Liaoning Normal Univ, Dalian 116029, Peoples R China

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

[41] Nanjing Normal Univ, Nanjing 210023, Peoples R China

[42] Nanjing Univ, Nanjing 210093, Peoples R China

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

[44] Natl Ctr Nucl Res, PL-02093 Warsaw, Poland

[45] North China Elect Power Univ, Beijing 102206, Peoples R China

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

[47] Qufu Normal Univ, Qufu 273165, Shandong, Peoples R China

[48] Shandong Normal Univ, Jinan 250014, Peoples R China

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

[50] Shanghai Jiao Tong Univ, Shanghai 200240, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2023年 / 130卷 / 21期

基金：

中国国家自然科学基金; 瑞典研究理事会; 国家重点研发计划; 新加坡国家研究基金会;

关键词：

RADIATIVE HYPERON DECAYS; BRANCHING RATIO; ASYMMETRY PARAMETER;

D O I：

10.1103/PhysRevLett.130.211901

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using (10 087 +/- 44) x 10(6) J/psi events collected with the BESIII detector, the radiative hyperon decay Sigma(+) -> p gamma is studied at an electron-positron collider experiment for the first time. The absolute branching fraction is measured to be (0.996 +/- 0.021(stat) +/- 0.018(syst)) x 10(-3), which is lower than its world average value by 4.2 standard deviations. Its decay asymmetry parameter is determined to be -0.652 +/- 0.056(stat) +/- 0.020(syst). The branching fraction and decay asymmetry parameter are the most precise to date, and the accuracies are improved by 78% and 34%, respectively.

引用

页数：9

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