Non-leptonic two-body weak decays of Λc(2286)

C.Q Geng,Y.K Hsiao,Yu-Heng Lin,Liang-Liang Liu

doi:10.1016/j.physletb.2017.11.062

C.Q Geng, Y.K Hsiao + Show 2 more

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https://doi.org/10.1016/j.physletb.2017.11.062

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Abstract

We study the non-leptonic two-body weak decays of Λc+(2286)→BnM with Bn (M) representing as the baryon (meson) states. Based on the SU(3) flavor symmetry, we can describe most of the data reexamined by the BESIII Collaboration with higher precisions. However, our result of B(Λc+→pπ0)=(5.6±1.5)×10−4 is larger than the current experimental limit of 3×10−4 (90% C.L.) by BESIII. In addition, we find that B(Λc+→Σ+K0)=(8.0±1.6)×10−4, B(Λc+→Σ+η′)=(1.0−0.8+1.6)×10−2, and B(Λc+→pη′)=(12.2−8.7+14.3)×10−4, which are accessible to the BESIII experiments.

Highlights

The BESIII Collaboration has reanalyzed the two-body weak decays of Λ+c (2286) with the final states to be the combinations of baryon (Bn) and pseudoscalar meson (M) particles, where Λ+c ≡ Λ+c (2286) along with Ξ+c,0(2470) belongs to the lowest-lying antitriplet charmed baryon (Bc) state
The factorization approach is demonstrated to well explain the B and bbaryon decays [5,6,7], such that it is applied to the two-body Λ+c → BnM decays [8], of which the amplitudes are derived as the combination of the two computable matrix elements for the Λ+c → Bn transition and the meson (M) production
In Eq (21), the simple estimation based on the data inputs gives that B(Λ+c → pπ0) = (5.1 ± 0.7) × 10−4, which agrees with our numerical fitting result of B(Λ+c → pπ0) = (5.6 ± 1.5) × 10−4, but is larger than the experimental upper bound of 3 × 10−4 (90%C.L.) in Eq (2) by BESIII

Summary

INTRODUCTION

The BESIII Collaboration has reanalyzed the two-body weak decays of Λ+c (2286) with the final states to be the combinations of baryon (Bn) and pseudoscalar meson (M) particles, where Λ+c ≡ Λ+c (2286) along with Ξ+c ,0(2470) belongs to the lowest-lying antitriplet charmed baryon (Bc) state. Detailed dynamics, which has been widely used in the B meson [15,16,17], b-baryon [18, 19] and Λ+c (Ξc) [9, 20,21,22,23] decays With this advantage, the two-body Λ+c → BnM decays can be related by the SU(3) parameters, which receive possible non-perturbative and nonfactorizable contributions [9, 20,21,22,23,24], despite of the unknown sources. We will extract the SU(3) parameters in the global fit, and predict the branching fractions to be compared with the future BESIII experimental measurements

FORMALISM

NUMERICAL RESULTS AND DISCUSSIONS

CONCLUSIONS