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First Measurement of the Absolute Branching Fraction of Λ →pμ- ν ¯ μ. / BESIII Collaboration.

In: Physical Review Letters, Vol. 127, No. 12, 121802, 17.09.2021.

Research output: Contribution to journal › Article › peer-review

Harvard

BESIII Collaboration 2021, 'First Measurement of the Absolute Branching Fraction of Λ →pμ- ν ¯ μ', Physical Review Letters, vol. 127, no. 12, 121802. https://doi.org/10.1103/PhysRevLett.127.121802

APA

BESIII Collaboration (2021). First Measurement of the Absolute Branching Fraction of Λ →pμ- ν ¯ μ. Physical Review Letters, 127(12), [121802]. https://doi.org/10.1103/PhysRevLett.127.121802

Vancouver

BESIII Collaboration. First Measurement of the Absolute Branching Fraction of Λ →pμ- ν ¯ μ. Physical Review Letters. 2021 Sept 17;127(12):121802. doi: 10.1103/PhysRevLett.127.121802

Author

BESIII Collaboration. / First Measurement of the Absolute Branching Fraction of Λ →pμ- ν ¯ μ. In: Physical Review Letters. 2021 ; Vol. 127, No. 12.

BibTeX

@article{587f0fe93b8e4a80a1748e7a0b88b99b,
title = "First Measurement of the Absolute Branching Fraction of Λ →pμ- ν ¯ μ",
abstract = "The absolute branching fraction of Λ→pμ-ν¯μ is reported for the first time based on an e+e- annihilation sample of 10×109 J/ψ events collected with the BESIII detector at s=3.097 GeV. The branching fraction is determined to be B(Λ→pμ-ν¯μ)=[1.48±0.21(stat)±0.08(syst)]×10-4, which is improved by about 30% in precision over the previous indirect measurements. Combining this result with the world average of B(Λ→pe-ν¯e), we obtain the ratio {[Γ(Λ→pμ-ν¯μ)]/[Γ(Λ→pe-ν¯e)]} to be 0.178±0.028, which agrees with the standard model prediction assuming lepton flavor universality. The asymmetry of the branching fractions of Λ→pμ-ν¯μ and Λ¯→p¯μ+νμ is also determined, and no evidence for CP violation is found.",
author = "{BESIII Collaboration} and M. Ablikim and Achasov, {M. N.} and P. Adlarson and S. Ahmed and M. Albrecht and R. Aliberti and A. Amoroso and An, {M. R.} and Q. An and Bai, {X. H.} and Y. Bai and O. Bakina and {Baldini Ferroli}, R. and I. Balossino and Y. Ban and K. Begzsuren and N. Berger and M. Bertani and D. Bettoni and F. Bianchi and J. Bloms and A. Bortone and I. Boyko and Briere, {R. A.} and H. Cai and X. Cai and A. Calcaterra and Cao, {G. F.} and N. Cao and Cetin, {S. A.} and Chang, {J. F.} and Chang, {W. L.} and G. Chelkov and Chen, {D. Y.} and G. Chen and Chen, {H. S.} and Chen, {M. L.} and Chen, {S. J.} and Chen, {X. R.} and Chen, {Y. B.} and Chen, {Z. J.} and Cheng, {W. S.} and G. Cibinetto and F. Cossio and Cui, {X. F.} and Dai, {H. L.} and Dai, {J. P.} and Dai, {X. C.} and Muchnoi, {N. Yu} and Nikolaev, {I. B.}",
note = "Funding Information: The BESIII Collaboration thanks the staff of BEPCII and the IHEP computing center for their strong support. The authors thank Prof. Ru-Min Wang and Prof. Xian-Wei Kang for helpful discussions. This work is supported in part by National Key R&D Program of China under Contracts No. 2020YFA0406300 and No. 2020YFA0406400; National Natural Science Foundation of China (NSFC) under Contracts No. 11805037, No. 11625523, No. 11635010, No. 11735014, No. 11822506, No. 11835012, No. 11935015, No. 11935016, No. 11935018, No. 11961141012, No. 12022510, No. 12025502, No. 12035009, No. 12035013, and No. 12061131003; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No. U1832121, No. U1732263, and No. U1832207; CAS Key Research Program of Frontier Sciences under Contract No. QYZDJ-SSW-SLH040; 100 Talents Program of CAS; Institute of Nuclear and Particle Physics at Shanghai Jiao Tong University and Shanghai Key Laboratory for Particle Physics and Cosmology; ERC under Contract No. 758462; European Union Horizon 2020 research and innovation programme under Contract No. Marie Sklodowska-Curie Grant Agreement No. 894790; German Research Foundation DFG under Contracts No. 443159800, Collaborative Research Center CRC 1044, FOR 2359, GRK 214; Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Science and Technology fund; Olle Engkvist Foundation under Contract No. 200-0605; STFC (United Kingdom); The Knut and Alice Wallenberg Foundation (Sweden) under Contract No. 2016.0157; The Royal Society, UK, under Contracts No. DH140054 and No. DH160214; The Swedish Research Council; U.S. Department of Energy under Contracts No. DE-FG02-05ER41374 and No. DE-SC-0012069. Publisher Copyright: {\textcopyright} 2021 authors. Published by the American Physical Society.",
year = "2021",
month = sep,
day = "17",
doi = "10.1103/PhysRevLett.127.121802",
language = "English",
volume = "127",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "12",

}

RIS

TY - JOUR

T1 - First Measurement of the Absolute Branching Fraction of Λ →pμ- ν ¯ μ

AU - BESIII Collaboration

AU - Ablikim, M.

AU - Achasov, M. N.

AU - Adlarson, P.

AU - Ahmed, S.

AU - Albrecht, M.

AU - Aliberti, R.

AU - Amoroso, A.

AU - An, M. R.

AU - An, Q.

AU - Bai, X. H.

AU - Bai, Y.

AU - Bakina, O.

AU - Baldini Ferroli, R.

AU - Balossino, I.

AU - Ban, Y.

AU - Begzsuren, K.

AU - Berger, N.

AU - Bertani, M.

AU - Bettoni, D.

AU - Bianchi, F.

AU - Bloms, J.

AU - Bortone, A.

AU - Boyko, I.

AU - Briere, R. A.

AU - Cai, H.

AU - Cai, X.

AU - Calcaterra, A.

AU - Cao, G. F.

AU - Cao, N.

AU - Cetin, S. A.

AU - Chang, J. F.

AU - Chang, W. L.

AU - Chelkov, G.

AU - Chen, D. Y.

AU - Chen, G.

AU - Chen, H. S.

AU - Chen, M. L.

AU - Chen, S. J.

AU - Chen, X. R.

AU - Chen, Y. B.

AU - Chen, Z. J.

AU - Cheng, W. S.

AU - Cibinetto, G.

AU - Cossio, F.

AU - Cui, X. F.

AU - Dai, H. L.

AU - Dai, J. P.

AU - Dai, X. C.

AU - Muchnoi, N. Yu

AU - Nikolaev, I. B.

N1 - Funding Information: The BESIII Collaboration thanks the staff of BEPCII and the IHEP computing center for their strong support. The authors thank Prof. Ru-Min Wang and Prof. Xian-Wei Kang for helpful discussions. This work is supported in part by National Key R&D Program of China under Contracts No. 2020YFA0406300 and No. 2020YFA0406400; National Natural Science Foundation of China (NSFC) under Contracts No. 11805037, No. 11625523, No. 11635010, No. 11735014, No. 11822506, No. 11835012, No. 11935015, No. 11935016, No. 11935018, No. 11961141012, No. 12022510, No. 12025502, No. 12035009, No. 12035013, and No. 12061131003; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No. U1832121, No. U1732263, and No. U1832207; CAS Key Research Program of Frontier Sciences under Contract No. QYZDJ-SSW-SLH040; 100 Talents Program of CAS; Institute of Nuclear and Particle Physics at Shanghai Jiao Tong University and Shanghai Key Laboratory for Particle Physics and Cosmology; ERC under Contract No. 758462; European Union Horizon 2020 research and innovation programme under Contract No. Marie Sklodowska-Curie Grant Agreement No. 894790; German Research Foundation DFG under Contracts No. 443159800, Collaborative Research Center CRC 1044, FOR 2359, GRK 214; Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Science and Technology fund; Olle Engkvist Foundation under Contract No. 200-0605; STFC (United Kingdom); The Knut and Alice Wallenberg Foundation (Sweden) under Contract No. 2016.0157; The Royal Society, UK, under Contracts No. DH140054 and No. DH160214; The Swedish Research Council; U.S. Department of Energy under Contracts No. DE-FG02-05ER41374 and No. DE-SC-0012069. Publisher Copyright: © 2021 authors. Published by the American Physical Society.

PY - 2021/9/17

Y1 - 2021/9/17

N2 - The absolute branching fraction of Λ→pμ-ν¯μ is reported for the first time based on an e+e- annihilation sample of 10×109 J/ψ events collected with the BESIII detector at s=3.097 GeV. The branching fraction is determined to be B(Λ→pμ-ν¯μ)=[1.48±0.21(stat)±0.08(syst)]×10-4, which is improved by about 30% in precision over the previous indirect measurements. Combining this result with the world average of B(Λ→pe-ν¯e), we obtain the ratio {[Γ(Λ→pμ-ν¯μ)]/[Γ(Λ→pe-ν¯e)]} to be 0.178±0.028, which agrees with the standard model prediction assuming lepton flavor universality. The asymmetry of the branching fractions of Λ→pμ-ν¯μ and Λ¯→p¯μ+νμ is also determined, and no evidence for CP violation is found.

AB - The absolute branching fraction of Λ→pμ-ν¯μ is reported for the first time based on an e+e- annihilation sample of 10×109 J/ψ events collected with the BESIII detector at s=3.097 GeV. The branching fraction is determined to be B(Λ→pμ-ν¯μ)=[1.48±0.21(stat)±0.08(syst)]×10-4, which is improved by about 30% in precision over the previous indirect measurements. Combining this result with the world average of B(Λ→pe-ν¯e), we obtain the ratio {[Γ(Λ→pμ-ν¯μ)]/[Γ(Λ→pe-ν¯e)]} to be 0.178±0.028, which agrees with the standard model prediction assuming lepton flavor universality. The asymmetry of the branching fractions of Λ→pμ-ν¯μ and Λ¯→p¯μ+νμ is also determined, and no evidence for CP violation is found.

UR - http://www.scopus.com/inward/record.url?scp=85115305739&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.127.121802

DO - 10.1103/PhysRevLett.127.121802

M3 - Article

C2 - 34597097

AN - SCOPUS:85115305739

VL - 127

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 12

M1 - 121802

ER -

ID: 34267879