Prospects for New Physics searches with $\Lambda_b \to \Lambda(1520)\ell^+\ell^-$ decays

TL;DR

This paper evaluates the potential of angular analysis in $\Lambda_b o \Lambda(1520)\ell^+\ell^-$ decays at LHCb to detect New Physics effects, especially through lepton asymmetry measurements, with improved sensitivity after upgrades.

Contribution

It provides a detailed sensitivity study for measuring angular observables in $\Lambda_b$ decays, highlighting the potential to distinguish New Physics scenarios from the Standard Model with future LHCb data.

Findings

Forward-backward lepton asymmetry is highly promising for NP detection.

Upgraded LHCb datasets can significantly improve measurement precision.

Potential to differentiate NP scenarios from SM in upcoming runs.

Abstract

We present the prospects of an angular analysis of the $\Lambda_b \to \Lambda(1520)\ell^+\ell^-$ decay. Using the expected yield in the current dataset collected at the LHCb experiment, as well as the foreseen ones after the LHCb upgrades, sensitivity studies are presented to determine the experimental precision on angular observables related to the lepton distribution and their potential to identify New Physics. The forward-backward lepton asymmetry at low dilepton invariant mass is particularly promising. NP scenarios favoured by the current anomalies in $b\to s\ell^+\ell^-$ decays can be distinguished from the SM case with the data collected between the Run 3 and the Upgrade 2 of the LHCb experiment.