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 - Николаев, Иван Борисович

AU - Мучной, Николай Юрьевич

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.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85192167942&origin=inward&txGid=3d2a774e4c1b4c7592e4d76fa53a1430

U2 - 10.1103/PhysRevD.109.L071103

DO - 10.1103/PhysRevD.109.L071103

M3 - Article

VL - 109

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 7

M1 - L071103

ER -