W-exchange contributions in hadronic decays of bottom baryon $\Lambda_{b}$

TL;DR

This paper investigates the W-exchange contributions in various nonleptonic decays of the bottom baryon Λ_b, highlighting the dominant role of W-exchange and analyzing specific decay channels with additional contributions.

Contribution

It provides a detailed analysis of W-exchange contributions in Λ_b decays, including baryon pole effects and parity considerations, which are less explored in prior studies.

Findings

W-exchange dominates the studied decays.

Baryon pole contribution affects the decay amplitude.

Additional parity-conserving contributions are significant.

Abstract

The nonleptonic decays $\Lambda_{b}\rightarrow\Sigma_{c}^{*-}\pi^{+},\Xi_{c}^{*0}K^{0}$ and $\Lambda_{b}\rightarrow\Delta^{0}D^{0},\Sigma^{*-}D_{0}^{+}$ are studied. In addition, the decays $\Lambda_{b}\rightarrow\Xi_{c}^{0}K^{0},\Sigma^{-}D_{s}^{+}$ are analyzed. For all these decays the dominant contribution comes from $W-$exchange, and for the decay $\Lambda_{b}\rightarrow\Lambda_{c}^{+}\pi^{-}$, in addition to factorization, baryon pole contribution to the $p$-wave (parity conserving) decay amplitude $B$ is discussed.