First observation of Λ c + → Λ K + π 0 and evidence of Λ c + → Λ K + π + π −

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doi:10.1103/PhysRevD.109.032003

Title: First observation of $Λ_{c}^{+} \to Λ K^{+} π^{0}$ and evidence of $Λ_{c}^{+} \to Λ K^{+} π^{+} π^{-}$

Journal Article · 07 February 2024 · Physical Review. D.

DOI: https://doi.org/10.1103/PhysRevD.109.032003 · OSTI ID:2290422

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ai, X. C.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, Y.; Bakina, O.; Balossino, I.; Ban, Y.; Bao, H. -R.; Batozskaya, V.; Begzsuren, K.; Berger, N.; Berlowski, M.; Bertani, M.; Bettoni, D.; Bianchi, F. more »

We present the first observation of the singly Cabibbo-suppressed decay $Λ_{c}^{+} \to Λ K^{+} π^{0}$ with a significance of $5.7 σ$ and the first evidence of $Λ_{c}^{+} \to Λ K^{+} π^{+} π^{-}$ decay with a significance of $3.1 σ$ , based on $e^{+} e^{-}$ annihilation data recorded by the BESIII detector at the BEPCII collider. The data correspond to an integrated luminosity of $6.4 {fb}^{- 1}$ , in the center-of-mass energy range from 4.600 to 4.950 GeV. We determine the branching fractions of $Λ_{c}^{+} \to Λ K^{+} π^{0}$ and $Λ_{c}^{+} \to Λ K^{+} π^{+} π^{-}$ relative to their Cabibbo-favored counterparts to be $\frac{B (Λ_{c}^{+} \to Λ K^{+} π^{0})}{B (Λ_{c}^{+} \to Λ π^{+} π^{0})} = (2.09 \pm 0.3 9_{stat} \pm 0.0 7_{syst}) \times 10^{- 2}$ and $\frac{B (Λ_{c}^{+} \to Λ K^{+} π^{+} π^{-})}{B (Λ_{c}^{+} \to Λ π^{+} π^{+} π^{-})} = (1.13 \pm 0.4 1_{stat} \pm 0.0 6_{syst}) \times 10^{- 2}$ , respectively. Moreover, by combining our measured result with the world average of $B (Λ_{c}^{+} \to Λ π^{+} π^{0})$ , we obtain the branching fraction $B (Λ_{c}^{+} \to Λ K^{+} π^{0}) = (1.49 \pm 0.2 7_{stat} \pm 0.0 5_{syst} \pm 0.0 8_{ref}) \times 10^{- 3}$ . This result significantly departs from theoretical predictions based on quark $S U (3)$ flavor symmetry, which is underpinned by the presumption of meson pair $S$ -wave amplitude dominance. Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-05ER41374

OSTI ID:: 2290422

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Vol. 109 Journal Issue: 3; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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