TY - JOUR

T1 - Measurement of the branching fractions of the decays Λc+→ΛKS0K+, Λc+→ΛKS0π+, and Λc+→ΛK*+

AU - BESIII Collaboration

AU - Ablikim, M.

AU - Achasov, M. n.

AU - Adlarson, P.

AU - Afedulidis, O.

AU - Ai, X. c.

AU - Aliberti, R.

AU - Amoroso, A.

AU - An, Q.

AU - Bai, Y.

AU - Bakina, O.

AU - Balossino, I.

AU - Ban, Y.

AU - Bao, H.-R.

AU - Batozskaya, V.

AU - Begzsuren, K.

AU - Berger, N.

AU - Berlowski, M.

AU - Bertani, M.

AU - Bettoni, D.

AU - Bianchi, F.

AU - Bianco, E.

AU - Bortone, A.

AU - Briere, R. a.

AU - Brueggemann, A.

AU - Николаев, Иван Борисович

AU - Мучной, Николай Юрьевич

PY - 2025/1/29

Y1 - 2025/1/29

N2 - Studies are performed of the Cabibbo-favored decay Λ+푐→Λ⁢퐾0푆⁢퐾+ and the singly Cabibbo-suppressed decay Λ+푐→Λ⁢퐾0푆⁢휋+, based on a sample of 푒+⁢푒− collision data, corresponding to an integrated luminosity of 4.5  fb−1, accumulated at center-of-mass energies between 4599.53 MeV and 4698.82 MeV with the BESIII detector. The decay Λ+푐 →Λ⁢퐾0푆⁢휋+ is observed for the first time. The branching fractions of Λ+푐 →Λ⁢퐾0푆⁢퐾+ and Λ+푐 →Λ⁢퐾0푆⁢휋+ are measured to be (3.04 ±0.30±0.16) ×10−3 and (1.73 ±0.27 ±0.10) ×10−3, respectively, where the first uncertainties are statistical and the second are systematic. These results correspond to the most precise measurement of these quantities for both decays. Evidence of a 퐾*+ contribution in the Λ+푐 →Λ⁢퐾0푆⁢휋+ decay is found with a statistical significance of 4.71⁢휎. The branching fraction of Λ+푐 →Λ⁢퐾*+ is calculated under three possible interference scenarios, with the significance increasing to 5.03⁢휎 when interference is taken into account.

AB - Studies are performed of the Cabibbo-favored decay Λ+푐→Λ⁢퐾0푆⁢퐾+ and the singly Cabibbo-suppressed decay Λ+푐→Λ⁢퐾0푆⁢휋+, based on a sample of 푒+⁢푒− collision data, corresponding to an integrated luminosity of 4.5  fb−1, accumulated at center-of-mass energies between 4599.53 MeV and 4698.82 MeV with the BESIII detector. The decay Λ+푐 →Λ⁢퐾0푆⁢휋+ is observed for the first time. The branching fractions of Λ+푐 →Λ⁢퐾0푆⁢퐾+ and Λ+푐 →Λ⁢퐾0푆⁢휋+ are measured to be (3.04 ±0.30±0.16) ×10−3 and (1.73 ±0.27 ±0.10) ×10−3, respectively, where the first uncertainties are statistical and the second are systematic. These results correspond to the most precise measurement of these quantities for both decays. Evidence of a 퐾*+ contribution in the Λ+푐 →Λ⁢퐾0푆⁢휋+ decay is found with a statistical significance of 4.71⁢휎. The branching fraction of Λ+푐 →Λ⁢퐾*+ is calculated under three possible interference scenarios, with the significance increasing to 5.03⁢휎 when interference is taken into account.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85217984217&origin=inward&txGid=4036227397bc6037ef4787efe8db67c1

U2 - 10.1103/PhysRevD.111.012014

DO - 10.1103/PhysRevD.111.012014

M3 - Article

VL - 111

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 1

M1 - 012014

ER -