Measurement of the absolute branching fraction of the inclusive decay Λ ¯ c- → n ¯ +X

BESIII Collaboration; N. Kalantar-Nayestanaki; R. Kappert; M. Kavatsyuk; J. Messchendorp; V. Rodin

doi:10.1103/PhysRevD.108.L031101

Measurement of the absolute branching fraction of the inclusive decay Λ ¯ c- → n ¯ +X

BESIII Collaboration, N. Kalantar-Nayestanaki, R. Kappert, M. Kavatsyuk, J. Messchendorp, V. Rodin

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Abstract

Based on e+e- collision data corresponding to an integrated luminosity of 4.5 fb-1 collected at the center-of-mass energies between 4.600 and 4.699 GeV with the BESIII detector at BEPCII, the absolute branching fraction of the inclusive decay Λ¯c-→n¯+X, where X refers to any possible final state particles, is measured. The absolute branching fraction is determined to be B(Λ¯c-→n¯+X)=(32.4±0.7±1.5)%, where the first uncertainty is statistical and the second systematic. Assuming CP symmetry, the measurement indicates that about one fourth of Λc+ (Λ¯c-) decay modes with a neutron (an antineutron) in the final state have not been observed.

Original language	English
Article number	L031101
Journal	Physical Review D
Volume	108
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevD.108.L031101
Publication status	Published - 3-Aug-2023

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@article{ceeb356385fa4312aed72b67b85cfe7b,

title = "Measurement of the absolute branching fraction of the inclusive decay Λ ¯ c- → n ¯ +X",

abstract = "Based on e+e- collision data corresponding to an integrated luminosity of 4.5 fb-1 collected at the center-of-mass energies between 4.600 and 4.699 GeV with the BESIII detector at BEPCII, the absolute branching fraction of the inclusive decay Λ¯c-→n¯+X, where X refers to any possible final state particles, is measured. The absolute branching fraction is determined to be B(Λ¯c-→n¯+X)=(32.4±0.7±1.5)%, where the first uncertainty is statistical and the second systematic. Assuming CP symmetry, the measurement indicates that about one fourth of Λc+ (Λ¯c-) decay modes with a neutron (an antineutron) in the final state have not been observed.",

author = "{BESIII Collaboration} and M. Ablikim and Achasov, {M. N.} and N. Kalantar-Nayestanaki and R. Kappert and M. Kavatsyuk and J. Messchendorp and V. Rodin",

note = "Funding Information: The BESIII Collaboration thanks the staff of BEPCII and the IHEP computing center and the supercomputing center of the University of Science and Technology of China (USTC) for their strong support. This work is supported in part by the National Key R&D Program of China under Contracts No. 2020YFA0406400, No. 2020YFA0406300; National Natural Science Foundation of China (NSFC) under Contracts No. 11635010, No. 11735014, No. 11835012, No. 11935015, No. 11935016, No. 11935018, No. 11961141012, No. 12022510, No. 12025502, No. 12035009, No. 12035013, No. 12192260, No. 12192261, No. 12192262, No. 12192263, No. 12192264, No. 12192265, No. 12005311; the Fundamental Research Funds for the Central Universities, Sun Yat-sen University, University of Science and Technology of China; 100 Talents Program of Sun Yat-sen University; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contract No. U1832207; the CAS Center for Excellence in Particle Physics (CCEPP); 100 Talents Program of CAS; The Institute of Nuclear and Particle Physics (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; ERC under Contract No. 758462; European Union{\textquoteright}s Horizon 2020 research and innovation program under Marie Sklodowska-Curie Grant Agreement under Contract No. 894790; German Research Foundation DFG under Contract No. 443159800, Collaborative Research Center CRC 1044, GRK 2149; Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Science and Technology fund; National Science Research and Innovation Fund (NSRF) via the Program Management Unit for Human Resources & Institutional Development, Research and Innovation under Contract No. B16F640076; STFC (United Kingdom); Suranaree University of Technology (SUT), Thailand Science Research and Innovation (TSRI), and National Science Research and Innovation Fund (NSRF) under Contract No. 160355; The Royal Society, UK under Contracts No. DH140054, No. DH160214; The Swedish Research Council; U.S. Department of Energy under Contract No. DE-FG02-05ER41374. 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 SCOAP3.",

year = "2023",

month = aug,

day = "3",

doi = "10.1103/PhysRevD.108.L031101",

language = "English",

volume = "108",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "AMER PHYSICAL SOC",

number = "3",

}

TY - JOUR

T1 - Measurement of the absolute branching fraction of the inclusive decay Λ ¯ c- → n ¯ +X

AU - BESIII Collaboration

AU - Ablikim, M.

AU - Achasov, M. N.

AU - Kalantar-Nayestanaki, N.

AU - Kappert, R.

AU - Kavatsyuk, M.

AU - Messchendorp, J.

AU - Rodin, V.

N1 - Funding Information: The BESIII Collaboration thanks the staff of BEPCII and the IHEP computing center and the supercomputing center of the University of Science and Technology of China (USTC) for their strong support. This work is supported in part by the National Key R&D Program of China under Contracts No. 2020YFA0406400, No. 2020YFA0406300; National Natural Science Foundation of China (NSFC) under Contracts No. 11635010, No. 11735014, No. 11835012, No. 11935015, No. 11935016, No. 11935018, No. 11961141012, No. 12022510, No. 12025502, No. 12035009, No. 12035013, No. 12192260, No. 12192261, No. 12192262, No. 12192263, No. 12192264, No. 12192265, No. 12005311; the Fundamental Research Funds for the Central Universities, Sun Yat-sen University, University of Science and Technology of China; 100 Talents Program of Sun Yat-sen University; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contract No. U1832207; the CAS Center for Excellence in Particle Physics (CCEPP); 100 Talents Program of CAS; The Institute of Nuclear and Particle Physics (INPAC) and Shanghai Key Laboratory for Particle Physics and Cosmology; ERC under Contract No. 758462; European Union’s Horizon 2020 research and innovation program under Marie Sklodowska-Curie Grant Agreement under Contract No. 894790; German Research Foundation DFG under Contract No. 443159800, Collaborative Research Center CRC 1044, GRK 2149; Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Science and Technology fund; National Science Research and Innovation Fund (NSRF) via the Program Management Unit for Human Resources & Institutional Development, Research and Innovation under Contract No. B16F640076; STFC (United Kingdom); Suranaree University of Technology (SUT), Thailand Science Research and Innovation (TSRI), and National Science Research and Innovation Fund (NSRF) under Contract No. 160355; The Royal Society, UK under Contracts No. DH140054, No. DH160214; The Swedish Research Council; U.S. Department of Energy under Contract No. DE-FG02-05ER41374. 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 SCOAP3.

PY - 2023/8/3

Y1 - 2023/8/3

N2 - Based on e+e- collision data corresponding to an integrated luminosity of 4.5 fb-1 collected at the center-of-mass energies between 4.600 and 4.699 GeV with the BESIII detector at BEPCII, the absolute branching fraction of the inclusive decay Λ¯c-→n¯+X, where X refers to any possible final state particles, is measured. The absolute branching fraction is determined to be B(Λ¯c-→n¯+X)=(32.4±0.7±1.5)%, where the first uncertainty is statistical and the second systematic. Assuming CP symmetry, the measurement indicates that about one fourth of Λc+ (Λ¯c-) decay modes with a neutron (an antineutron) in the final state have not been observed.

AB - Based on e+e- collision data corresponding to an integrated luminosity of 4.5 fb-1 collected at the center-of-mass energies between 4.600 and 4.699 GeV with the BESIII detector at BEPCII, the absolute branching fraction of the inclusive decay Λ¯c-→n¯+X, where X refers to any possible final state particles, is measured. The absolute branching fraction is determined to be B(Λ¯c-→n¯+X)=(32.4±0.7±1.5)%, where the first uncertainty is statistical and the second systematic. Assuming CP symmetry, the measurement indicates that about one fourth of Λc+ (Λ¯c-) decay modes with a neutron (an antineutron) in the final state have not been observed.

UR - http://www.scopus.com/inward/record.url?scp=85169323222&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.108.L031101

DO - 10.1103/PhysRevD.108.L031101

M3 - Letter

SN - 2470-0010

VL - 108

JO - Physical Review D

JF - Physical Review D

IS - 3

M1 - L031101

ER -

Measurement of the absolute branching fraction of the inclusive decay Λ ¯ c- → n ¯ +X

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