Observation of the singly Cabibbo-suppressed decay Λc+ → ς-K+π+

BESIII Collaboration; N. Kalantar-Nayestanaki; M. Kavatsyuk; J. Messchendorp

doi:10.1103/PhysRevD.109.L071103

Observation of the singly Cabibbo-suppressed decay Λc+ → ς-K+π+

BESIII Collaboration, N. Kalantar-Nayestanaki, M. Kavatsyuk, J. Messchendorp

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Abstract

The singly Cabibbo-suppressed decay Λc+→ς-K+π+ is observed for the first time with a statistical significance of 5.4σ by using 4.5 fb-1 of e+e- collision data collected at center-of-mass energies between 4.600 and 4.699 GeV with the BESIII detector at BEPCII. The absolute branching fraction of Λc+→ς-K+π+ is measured to be (3.8±1.2stat±0.2syst)×10-4 in a model-independent approach. This is the first observation of a Cabibbo-suppressed Λc+ decay involving ς- in the final state. The ratio of branching fractions between Λc+→ς-K+π+ and the Cabibbo-favored decay Λc+→ς-π+π+ is observed to be (0.4±0.1)sc2, where scsinθc=0.2248 with θc the Cabibbo mixing angle.

Original language	English
Article number	L071103
Number of pages	9
Journal	Physical Review D
Volume	109
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevD.109.L071103
Publication status	Published - 30-Apr-2024

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@article{0d8e972bef7847ad8241254d2770604d,

title = "Observation of the singly Cabibbo-suppressed decay Λc+ → ς-K+π+",

abstract = "The singly Cabibbo-suppressed decay Λc+→ς-K+π+ is observed for the first time with a statistical significance of 5.4σ by using 4.5 fb-1 of e+e- collision data collected at center-of-mass energies between 4.600 and 4.699 GeV with the BESIII detector at BEPCII. The absolute branching fraction of Λc+→ς-K+π+ is measured to be (3.8±1.2stat±0.2syst)×10-4 in a model-independent approach. This is the first observation of a Cabibbo-suppressed Λc+ decay involving ς- in the final state. The ratio of branching fractions between Λc+→ς-K+π+ and the Cabibbo-favored decay Λc+→ς-π+π+ is observed to be (0.4±0.1)sc2, where scsinθc=0.2248 with θc the Cabibbo mixing angle. ",

author = "{BESIII Collaboration} and M. Ablikim and M.N. Achasov and P. Adlarson and Ai, {X. C.} and R. Aliberti and A. Amoroso and An, {M. R.} and Q. An and Y. Bai and O. Bakina and N. Kalantar-Nayestanaki and M. Kavatsyuk and J. Messchendorp",

year = "2024",

month = apr,

day = "30",

doi = "10.1103/PhysRevD.109.L071103",

language = "English",

volume = "109",

journal = "Physical Review D",

issn = "1550-7998",

publisher = "AMER PHYSICAL SOC",

number = "7",

}

TY - JOUR

T1 - Observation of the singly Cabibbo-suppressed decay Λc+ → ς-K+π+

AU - BESIII Collaboration

AU - Ablikim, M.

AU - Achasov, M.N.

AU - Adlarson, P.

AU - Ai, X. C.

AU - Aliberti, R.

AU - Amoroso, A.

AU - An, M. R.

AU - An, Q.

AU - Bai, Y.

AU - Bakina, O.

AU - Kalantar-Nayestanaki, N.

AU - Kavatsyuk, M.

AU - Messchendorp, J.

PY - 2024/4/30

Y1 - 2024/4/30

N2 - The singly Cabibbo-suppressed decay Λc+→ς-K+π+ is observed for the first time with a statistical significance of 5.4σ by using 4.5 fb-1 of e+e- collision data collected at center-of-mass energies between 4.600 and 4.699 GeV with the BESIII detector at BEPCII. The absolute branching fraction of Λc+→ς-K+π+ is measured to be (3.8±1.2stat±0.2syst)×10-4 in a model-independent approach. This is the first observation of a Cabibbo-suppressed Λc+ decay involving ς- in the final state. The ratio of branching fractions between Λc+→ς-K+π+ and the Cabibbo-favored decay Λc+→ς-π+π+ is observed to be (0.4±0.1)sc2, where scsinθc=0.2248 with θc the Cabibbo mixing angle.

AB - The singly Cabibbo-suppressed decay Λc+→ς-K+π+ is observed for the first time with a statistical significance of 5.4σ by using 4.5 fb-1 of e+e- collision data collected at center-of-mass energies between 4.600 and 4.699 GeV with the BESIII detector at BEPCII. The absolute branching fraction of Λc+→ς-K+π+ is measured to be (3.8±1.2stat±0.2syst)×10-4 in a model-independent approach. This is the first observation of a Cabibbo-suppressed Λc+ decay involving ς- in the final state. The ratio of branching fractions between Λc+→ς-K+π+ and the Cabibbo-favored decay Λc+→ς-π+π+ is observed to be (0.4±0.1)sc2, where scsinθc=0.2248 with θc the Cabibbo mixing angle.

U2 - 10.1103/PhysRevD.109.L071103

DO - 10.1103/PhysRevD.109.L071103

M3 - Letter

SN - 1550-7998

VL - 109

JO - Physical Review D

JF - Physical Review D

IS - 7

M1 - L071103

ER -

Observation of the singly Cabibbo-suppressed decay Λc+ → ς-K+π+

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