Probing CP symmetry and weak phases with entangled double-strange baryons

被引：52

作者：

Ablikim, M. ^{[1
]}

Achasov, M. N. ^{[2
,78
]}

Adlarson, P. ^{[3
]}

Ahmed, S. ^{[4
]}

Albrecht, M. ^{[5
]}

Aliberti, R. ^{[6
]}

Amoroso, A. ^{[7
,8
]}

An, M. R. ^{[9
]}

An, Q. ^{[10
,11
]}

Bai, X. H. ^{[12
]}

Bai, Y. ^{[13
]}

Bakina, O. ^{[14
]}

Ferroli, R. Baldini ^{[15
]}

Balossino, I ^{[16
]}

Ban, Y. ^{[17
,79
]}

Begzsuren, K. ^{[18
]}

Berger, N. ^{[6
]}

Bertani, M. ^{[15
]}

Bettoni, D. ^{[16
]}

Bianchi, F. ^{[7
,8
]}

Biernat, J. ^{[3
]}

Bloms, J. ^{[19
]}

Bortone, A. ^{[7
,8
]}

Boyko, I ^{[14
]}

Briere, R. A. ^{[20
]}

Cai, H. ^{[21
]}

Cai, X. ^{[1
,11
]}

Calcaterra, A. ^{[15
]}

Cao, G. F. ^{[1
,22
]}

Cao, N. ^{[1
,22
]}

Cetin, S. A. ^{[23
]}

Chang, J. F. ^{[1
,11
]}

Chang, W. L. ^{[1
,22
]}

Chelkov, G. ^{[14
,80
]}

Chen, D. Y. ^{[24
]}

Chen, G. ^{[1
]}

Chen, H. S. ^{[1
,22
]}

Chen, M. L. ^{[1
,11
]}

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

Chen, X. R. ^{[26
]}

Chen, Y. B. ^{[1
,11
]}

Chen, Z. J. ^{[27
,81
]}

Cheng, W. S. ^{[8
]}

Cibinetto, G. ^{[16
]}

Cossio, F. ^{[8
]}

Cui, X. F. ^{[28
]}

Dai, H. L. ^{[1
,11
]}

Dai, X. C. ^{[1
,22
]}

Dbeyssi, A. ^{[4
]}

de Boer, R. E. ^{[5
]}

机构：

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

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

[3] Uppsala Univ, Uppsala, Sweden

[4] Helmholtz Inst Mainz, Mainz, Germany

[5] Ruhr Univ Bochum, Bochum, Germany

[6] Johannes Gutenberg Univ Mainz, Mainz, Germany

[7] Univ Turin, Turin, Italy

[8] Ist Nazl Fis Nucl, Turin, Italy

[9] Liaoning Normal Univ, Dalian, Peoples R China

[10] Univ Sci & Technol China, Hefei, Peoples R China

[11] State Key Lab Particle Detect & Elect, Hefei, Peoples R China

[12] Univ Jinan, Jinan, Peoples R China

[13] Southeast Univ, Nanjing, Peoples R China

[14] Joint Inst Nucl Res, Dubna, Russia

[15] Ist Nazl Fis Nucl, Lab Nazl Frascati, Frascati, Italy

[16] Ist Nazl Fis Nucl, Sez Ferrara, Ferrara, Italy

[17] Peking Univ, Beijing, Peoples R China

[18] Inst Phys & Technol, Ulaanbaatar, Mongolia

[19] Univ Munster, Munster, Germany

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

[21] Wuhan Univ, Wuhan, Peoples R China

[22] Univ Chinese Acad Sci, Beijing, Peoples R China

[23] Istinye Univ, Sariyer, Turkey

[24] Cent China Normal Univ, Wuhan, Peoples R China

[25] Nanjing Univ, Nanjing, Peoples R China

[26] Inst Modern Phys, Lanzhou, Peoples R China

[27] Hunan Univ, Changsha, Peoples R China

[28] Nankai Univ, Tianjin, Peoples R China

[29] Liaoning Univ, Shenyang, Peoples R China

[30] Zhengzhou Univ, Zhengzhou, Peoples R China

[31] Univ Piemonte Orientale, Alessandria, Italy

[32] Sun Yat Sen Univ, Guangzhou, Peoples R China

[33] Univ South China, Hengyang, Peoples R China

[34] Univ Ferrara, Ferrara, Italy

[35] Univ Manchester, Manchester, Lancs, England

[36] Univ Oxford, Oxford, England

[37] GSI Helmholtzctr Heavy Ion Res GmbH, Darmstadt, Germany

[38] Beihang Univ, Beijing, Peoples R China

[39] Guangxi Univ, Nanning, Peoples R China

[40] Indiana Univ, Bloomington, IN USA

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

[42] Shandong Normal Univ, Jinan, Peoples R China

[43] Fudan Univ, Shanghai, Peoples R China

[44] Shandong Univ, Jinan, Peoples R China

[45] Henan Normal Univ, Xinxiang, Henan, Peoples R China

[46] Univ Hawaii, Honolulu, HI 96822 USA

[47] Suranaree Univ Technol, Nakhon Ratchasima, Thailand

[48] South China Normal Univ, Guangzhou, Peoples R China

[49] Univ Punjab, Lahore, Pakistan

[50] Huangshan Coll, Huangshan, Peoples R China

来源：

NATURE | 2022年 / 606卷 / 7912期

基金：

欧洲研究理事会; 中国国家自然科学基金; 欧盟地平线“2020”; 英国科学技术设施理事会;

关键词：

DECAY; VIOLATION; HYPERON; NUCLEAR; PHYSICS; POLARIZATION;

D O I：

10.1038/s41586-022-04624-1

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Though immensely successful, the standard model of particle physics does not offer any explanation as to why our Universe contains so much more matter than antimatter. A key to a dynamically generated matter-antimatter asymmetry is the existence of processes that violate the combined charge conjugation and parity (CP) symmetry(1). As such, precision tests of CP symmetry may be used to search for physics beyond the standard model. However, hadrons decay through an interplay of strong and weak processes, quantified in terms of relative phases between the amplitudes. Although previous experiments constructed CP observables that depend on both strong and weak phases, we present an approach where sequential two-body decays of entangled multi-strange baryon-antibaryon pairs provide a separation between these phases. Our method, exploiting spin entanglement between the double-strange baryon and its antiparticle(2) (+), has enabled a direct determination of the weak-phase difference, (xi(P) - xi(S)) = (1.2 +/- 3.4 +/- 0.8) x 10(-2) rad. Furthermore, three independent CP observables can be constructed from our measured parameters. The precision in the estimated parameters for a given data sample size is several orders of magnitude greater than achieved with previous methods(3). Finally, we provide an independent measurement of the recently debated Lambda decay parameter alpha(Lambda) (refs. (4,5)). The Lambda(Lambda) over bar asymmetry is in agreement with and compatible in precision to the most precise previous measurement(4).

引用

页码：64 / +

页数：16

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