Test of CP Symmetry in Hyperon to Neutron Decays

BESIII Collaboration

doi:10.1103/PhysRevLett.131.191802

Test of CP Symmetry in Hyperon to Neutron Decays

BESIII Collaboration

Instituto de Alta Investigación

CAS - Institute of High Energy Physics
Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
Novosibirsk State University
Uppsala University
Zhengzhou University
Chinese Academy of Sciences
Johannes Gutenberg University Mainz
University of Turin
National Institute for Nuclear Physics
Liaoning Normal University
University of Science and Technology of China
Southeast University, Nanjing
Joint Institute for Nuclear Research
Peking University
National Centre for Nuclear Research
Mongolian Academy of Sciences
University of Münster
Carnegie Mellon University
Wuhan University
University of Chinese Academy of Sciences
Istinye University
Xinyang Normal University
Nankai University
Moscow Institute of Physics and Technology
Soochow University
Nanjing University
Tsinghua University
CAS - Institute of Modern Physics
Jilin University
Hunan University
Chung-Ang University
Ruhr University Bochum
Shandong University
Yunnan University
Helmholtz Institute Mainz
University of Jinan
Liaoning University
University of Eastern Piedmont
Sun Yat-Sen University
University of Oxford
University of Ferrara
University of Manchester
GSI Helmholtz Centre for Heavy Ion Research
Guangxi University
Henan University of Technology
Nanjing Normal University
Shandong Normal University
Fudan University
Henan Normal University
University of Hawai'i at Mānoa
Suranaree University of Technology
South China Normal University
University of the Punjab
Indiana University Bloomington
Hangzhou Normal University
Huangshan College
University of Groningen
China University of Geosciences, Wuhan
Justus Liebig University Giessen
Indian Institute of Technology Madras
IBA
Qufu Normal University
Beijing Institute of Petrochemical Technology
Lanzhou University
Sichuan University
Guangxi Normal University
Shanxi University
Central China Normal University
Henan University of Science and Technology
University of South China
Central South University
Zhejiang University
Goethe University Frankfurt
COMSATS University Islamabad
University of Perugia
Universidad de Tarapacá
Petersburg Nuclear Physics Institute (PNPI)
Hunan Normal University
Shanxi Normal University
Near East University
North China Electric Power University
Hebei University
University of Science and Technology Liaoning
Inner Mongolia University
Yantai University
Shanghai Jiao Tong University
Ministry of Education of the People's Republic of China
China Center of Advanced Science and Technology World Laboratory
Beihang University
Henan University

Producción científica: Contribución a una revista › Artículo › revisión exhaustiva

17 Citas (Scopus)

Resumen

The quantum entangled J/ψ→ς+ς¯- pairs from (1.0087±0.0044)×1010 J/ψ events taken by the BESIII detector are used to study the nonleptonic two-body weak decays ς+→nπ+ and ς¯-→n¯π-. The CP-odd weak decay parameters of the decays ς+→nπ+ (α+) and ς¯-→n¯π- (α¯-) are determined to be 0.0481±0.0031stat±0.0019syst and -0.0565±0.0047stat±0.0022syst, respectively. The decay parameter α¯- is measured for the first time, and the accuracy of α+ 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 ACP=(α++α¯-)/(α+-α¯-)=-0.080±0.052stat±0.028syst. Assuming CP conservation, the average decay parameter is determined as «α+» =(α+-α¯-)/2=-0.0506±0.0026stat±0.0019syst, while the ratios α+/α0 and α¯-/α¯0 are -0.0490±0.0032stat±0.0021syst and -0.0571±0.0053stat±0.0032syst, where α0 and α¯0 are the decay parameters of the decays ς+→pπ0 and ς¯-→p¯π0, respectively.

Idioma original	Inglés
Número de artículo	191802
Publicación	Physical Review Letters
Volumen	131
N.º	19
DOI	https://doi.org/10.1103/PhysRevLett.131.191802
Estado	Publicada - 10 nov 2023

Acceder al documento

10.1103/PhysRevLett.131.191802

Otros archivos y enlaces

Enlace a la publicación en Scopus

Citar esto

@article{a4b95fa680094069bbe0c4ab5aef1f0c,

title = "Test of CP Symmetry in Hyperon to Neutron Decays",

abstract = "The quantum entangled J/ψ→ς+ς¯- pairs from (1.0087±0.0044)×1010 J/ψ events taken by the BESIII detector are used to study the nonleptonic two-body weak decays ς+→nπ+ and ς¯-→n¯π-. The CP-odd weak decay parameters of the decays ς+→nπ+ (α+) and ς¯-→n¯π- (α¯-) are determined to be 0.0481±0.0031stat±0.0019syst and -0.0565±0.0047stat±0.0022syst, respectively. The decay parameter α¯- is measured for the first time, and the accuracy of α+ 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 ACP=(α++α¯-)/(α+-α¯-)=-0.080±0.052stat±0.028syst. Assuming CP conservation, the average decay parameter is determined as «α+» =(α+-α¯-)/2=-0.0506±0.0026stat±0.0019syst, while the ratios α+/α0 and α¯-/α¯0 are -0.0490±0.0032stat±0.0021syst and -0.0571±0.0053stat±0.0032syst, where α0 and α¯0 are the decay parameters of the decays ς+→pπ0 and ς¯-→p¯π0, respectively.",

author = "M. Ablikim and Achasov, \{M. N.\} and P. Adlarson and Ai, \{X. C.\} and S. Kabana and \{The BESIII collaboration\}",

note = "Publisher Copyright: {\textcopyright} 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the {"}https://creativecommons.org/licenses/by/4.0/{"}Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP",

year = "2023",

month = nov,

day = "10",

doi = "10.1103/PhysRevLett.131.191802",

language = "English",

volume = "131",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "19",

}

TY - JOUR

T1 - Test of CP Symmetry in Hyperon to Neutron Decays

AU - Ablikim, M.

AU - Achasov, M. N.

AU - Adlarson, P.

AU - Ai, X. C.

AU - Kabana, S.

AU - The BESIII collaboration

N1 - Publisher Copyright: © 2023 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP

PY - 2023/11/10

Y1 - 2023/11/10

N2 - The quantum entangled J/ψ→ς+ς¯- pairs from (1.0087±0.0044)×1010 J/ψ events taken by the BESIII detector are used to study the nonleptonic two-body weak decays ς+→nπ+ and ς¯-→n¯π-. The CP-odd weak decay parameters of the decays ς+→nπ+ (α+) and ς¯-→n¯π- (α¯-) are determined to be 0.0481±0.0031stat±0.0019syst and -0.0565±0.0047stat±0.0022syst, respectively. The decay parameter α¯- is measured for the first time, and the accuracy of α+ 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 ACP=(α++α¯-)/(α+-α¯-)=-0.080±0.052stat±0.028syst. Assuming CP conservation, the average decay parameter is determined as «α+» =(α+-α¯-)/2=-0.0506±0.0026stat±0.0019syst, while the ratios α+/α0 and α¯-/α¯0 are -0.0490±0.0032stat±0.0021syst and -0.0571±0.0053stat±0.0032syst, where α0 and α¯0 are the decay parameters of the decays ς+→pπ0 and ς¯-→p¯π0, respectively.

AB - The quantum entangled J/ψ→ς+ς¯- pairs from (1.0087±0.0044)×1010 J/ψ events taken by the BESIII detector are used to study the nonleptonic two-body weak decays ς+→nπ+ and ς¯-→n¯π-. The CP-odd weak decay parameters of the decays ς+→nπ+ (α+) and ς¯-→n¯π- (α¯-) are determined to be 0.0481±0.0031stat±0.0019syst and -0.0565±0.0047stat±0.0022syst, respectively. The decay parameter α¯- is measured for the first time, and the accuracy of α+ 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 ACP=(α++α¯-)/(α+-α¯-)=-0.080±0.052stat±0.028syst. Assuming CP conservation, the average decay parameter is determined as «α+» =(α+-α¯-)/2=-0.0506±0.0026stat±0.0019syst, while the ratios α+/α0 and α¯-/α¯0 are -0.0490±0.0032stat±0.0021syst and -0.0571±0.0053stat±0.0032syst, where α0 and α¯0 are the decay parameters of the decays ς+→pπ0 and ς¯-→p¯π0, respectively.

UR - https://www.scopus.com/pages/publications/85177768607

U2 - 10.1103/PhysRevLett.131.191802

DO - 10.1103/PhysRevLett.131.191802

M3 - Article

C2 - 38000397

AN - SCOPUS:85177768607

SN - 0031-9007

VL - 131

JO - Physical Review Letters

JF - Physical Review Letters

IS - 19

M1 - 191802

ER -

Test of CP Symmetry in Hyperon to Neutron Decays

Resumen

Acceder al documento

Otros archivos y enlaces

Huella

Citar esto