Study of $CP$ violation in $\Lambda_b^0\rightarrow N^*M$ decays with the final-state rescattering mechanism

TL;DR

This paper investigates $CP$ violation in $ ext{Lambda}_b^0$ decays using a final-state rescattering mechanism, predicting observable asymmetries and branching ratios relevant for LHCb experiments.

Contribution

It introduces a novel calculation of rescattering effects in $ ext{Lambda}_b^0$ decays, including both absorptive and dispersive parts, enhancing understanding of $CP$ violation mechanisms.

Findings

Predicted branching ratios for $ ext{Lambda}_b^0$ decays to $N^*$ and mesons.

Calculated direct and partial-wave $CP$ asymmetries for these decays.

Provided decay asymmetry parameters relevant for experimental measurements.

Abstract

In this work, we investigate the charmless non-leptonic two-body $\Lambda_b$ decays within the framework of final-state rescattering mechanism. In contrast to the Cutkosky cutting method, we compute both the absorptive and dispersive parts of the hadronic rescattering triangle diagrams. Based on the established formalism, we analyze the $\Lambda_b \to N^*(1535,1520)M$ decay processes with $M =K_S, K^*_0(700)$, $f_0(500,980), \rho(770), \bar{K}^{*0}$, $\phi$, and predict various physical observables, such as their branching ratios, direct and partial-wave $CP$ asymmetries, as well as decay asymmetry parameters. These two-body decay processes are expected to contribute primarily to the subsequent four-body decay channels, such as $\Lambda_b^0 \to p\,\pi^-\,\pi^+\,\pi^-$, whose $CP$ asymmetry measurements will be accessible at the LHCb experiment.