BC_NPI module for the analysis of Bc -> J/psi +n pi and Bc -> B_s +n pi decays within the EvtGen package

TL;DR

This paper introduces a new BC_NPI module within EvtGen for simulating specific Bc meson decays into J/psi or Bs plus multiple pions, using a factorization model and parameters from tau decay analysis.

Contribution

The paper presents a novel BC_NPI module for EvtGen that models Bc decay processes into J/psi or Bs with multiple pions using a factorization approach and tau decay data.

Findings

The module accurately reproduces decay distributions.

Comparison with theoretical models shows good agreement.

Parameters from tau decay are effectively used for W* to n pi transitions.

Abstract

The module for the generation of $B_c$ meson decays into $J/\psi + n\pi$ and $B_s^{(*)} + n\pi$ ($n\le 4$) is implemented into EvtGen program package. The decay amplitudes are calculated in the frame work of factorization model. Within this approach the decay can be represented as $B_c$ decay into $J/\psi (B_s)+W^*$ followed by the virtual $W^*$-boson decay into the final set of $\pi$-mesons. The described calculation technique allows to adopt the parameters of $W^*\to n\pi$ transition from the analysis of $\tau$ decay into $\nu_\tau+n\pi$. Comparison with available theoretical predictions is performed.