Test of CP Symmetry in Hyperon to Neutron Decays

被引：2

作者：

Ablikim, M. ^{[1
]}

Achasov, M. N. ^{[13
,91
]}

Adlarson, P. ^{[83
]}

Ai, X. C. ^{[89
]}

Aliberti, R. ^{[39
]}

Amoroso, A. ^{[79
,80
,82
]}

An, M. R. ^{[43
]}

An, Q. ^{[61
,62
,76
]}

Bai, Y. ^{[60
]}

Bakina, O. ^{[40
]}

Balossino, I ^{[32
]}

Ban, Y. ^{[50
,99
]}

Batozskaya, V ^{[1
,48
]}

Begzsuren, K. ^{[36
]}

Berger, N. ^{[39
]}

Berlowski, M. ^{[48
]}

Bertani, M. ^{[29
]}

Bettoni, D. ^{[32
]}

Bianchi, F. ^{[79
,80
,82
]}

Bianco, E. ^{[79
,80
,82
]}

Bloms, J. ^{[73
]}

Bortone, A. ^{[79
,80
,82
]}

Boyko, I ^{[40
]}

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

Brueggemann, A. ^{[73
]}

Cai, H. ^{[84
]}

Cai, X. ^{[1
,61
,62
]}

Calcaterra, A. ^{[29
]}

Cao, G. F. ^{[1
,68
]}

Cao, N. ^{[1
,68
]}

Cetin, S. A. ^{[66
]}

Chang, J. F. ^{[1
,61
,62
]}

Chang, T. T. ^{[85
]}

Chang, W. L. ^{[1
,68
]}

Che, G. R. ^{[47
]}

Chelkov, G. ^{[40
,90
]}

Chen, C. ^{[47
]}

Chen, Chao ^{[58
]}

Chen, G. ^{[1
]}

Chen, H. S. ^{[1
,68
]}

Chen, M. L. ^{[1
,61
,62
,68
]}

Chen, S. J. ^{[46
]}

Chen, S. M. ^{[65
]}

Chen, T. ^{[1
,68
]}

Chen, X. R. ^{[35
,68
]}

Chen, X. T. ^{[1
,68
]}

Chen, Y. B. ^{[1
,61
,62
]}

Chen, Y. Q. ^{[38
]}

Chen, Z. J. ^{[26
,100
]}

Cheng, W. S. ^{[82
]}

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, Hubei, 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] Chung Ang Univ, Seoul 06974, South Korea

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

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

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

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

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

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

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

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

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

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

[21] Henan Univ, Kaifeng 475004, Peoples R China

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

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

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

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

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

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

[28] Indiana Univ, Bloomington, IN 47405 USA

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

[30] Ist Nazl Fis Nucl, Sez Perugia, I-06100 Perugia, Italy

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

[32] Ist Nazl Fis Nucl, Sez Ferrara, I-44122 Ferrara, Italy

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

[34] Inner Mongolia Univ, Hohhot 010021, Peoples R China

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

来源：

PHYSICAL REVIEW LETTERS | 2023年 / 131卷 / 19期

基金：

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

关键词：

SIGMA;

D O I：

10.1103/PhysRevLett.131.191802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The quantum entangled J/psi -> Sigma(+)(Sigma) over bar (-) pairs from (1.0087 +/- 0.0044) x 10(10) J/psi events taken by the BESIII detector are used to study the nonleptonic two-body weak decays Sigma(+) -> n pi(+) and (Sigma) over bar (-) -> (n) over bar pi(-). The CP-odd weak decay parameters of the decays Sigma(+) -> n pi(+) (alpha(+)) and (Sigma) over bar (-) -> (n) over bar pi(-) ((alpha) over bar (-)) are determined to be 0.0481 +/- 0.0031(stat) +/- 0.0019(syst) and -0.0565 +/- 0.0047(sta)t +/- 0.0022(syst), respectively. The decay parameter (alpha) over bar (-) is measured for the first time, and the accuracy of alpha(+) is improved by a factor of 4 compared to the previous results. The simultaneously determined decay parameters allow the first precision CP symmetry test for any hyperon decay with a neutron in the final state with the measurement of A(CP) = (alpha(+) + (alpha) over bar-)/(alpha(+) - (alpha) over bar (-))/2 = -0.080 +/- 0.052(stat) +/- 0.028(sys)t. Assuming CP conservation, the average decay parameter is determined as <alpha(+)> = (alpha(+) - (alpha) over bar (-))/2 = -0.0506 +/- 0.0026(stat) +/- 0.0019(syst), while the ratios alpha(+)/alpha(0) and (alpha) over bar (-)/(alpha) over bar (0) are -0.0490 +/- 0.0032(stat) +/- 0.0021(syst) and -0.0571 +/- 0.0053(stat) +/- 0.0032(syst), where alpha(0) and (alpha) over bar (0) are the decay parameters of the decays Sigma(+) -> p pi(0) and (Sigma) over bar (-) -> (p) over bar pi(0), respectively.

引用

页数：9

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