Form factors, branching ratio and forward-backward asymmetry in B -> K_{1}ell ^{+} ell ^{-} decays

TL;DR

This paper investigates the decay process B -> K_{1}ell^+ell^- focusing on form factors, branching ratios, and forward-backward asymmetry, providing insights into the Standard Model through theoretical calculations of these observables.

Contribution

The study introduces a method using Ward identities to calculate form factors for B -> K_{1} transitions, enabling precise predictions of decay observables.

Findings

Calculated form factors for B -> K_{1} transitions.

Predicted branching ratios and forward-backward asymmetry.

Identified the zero point of asymmetry as a test of the Standard Model.

Abstract

We study long-distance effects in rare exclusive semileptonic decays B -> K_{1}ell ^{+}ell ^{-}, K_{1} is the axial vector meson.The form factors, describing the meson transition amplitudes of the effective Hamiltonian, are calculated using Ward identites which are then used to calculate branching ratio and forward-backward asymmetry in these decay modes. The zero of forward-backward asymmetry is of special interest and provide us the precission test of Standard model.