$B_s^0 - \bar B_s^0$ mixing and $b \to s $ transitions in isosinglet down quark model

TL;DR

This paper investigates how an isosinglet down quark model can explain discrepancies in $B_s$ mixing and $b o s$ transitions, providing constraints and demonstrating consistency with observed deviations.

Contribution

It introduces an extended quark model with a vector-like down quark to account for anomalies in $B_s$ mixing and $b o s$ processes, offering new physics constraints.

Findings

The model can explain the observed $B_s$ mass difference discrepancy.

It successfully accounts for deviations in $B_s o \psi \phi$, $B o K \pi$, and $B o \phi K_s$ decays.

Constraints on new physics parameters are derived from experimental data.

Abstract

The recent observation of the mass difference in $B_s$ system seems to be not in complete agreement with the corresponding standard model value. We consider the model with an extra vector like down quark to explain this discrepancy and obtain the constraints on the new physics parameters. Thereafter, we show that with these new constraints this model can successfully explain other observed deviations associated with $b \to s$ transitions, namely, $B_s \to \psi \phi$, $B\to K \pi$ and $B\to \phi K_s$.