Scalar leptoquark effects on $B \to \mu \bar\nu$ decay

TL;DR

This paper investigates how a scalar leptoquark could significantly alter the decay rate of B mesons into muons and neutrinos, providing potential signals of physics beyond the Standard Model.

Contribution

It analyzes the effects of a scalar leptoquark on B meson leptonic decays, highlighting possible modifications at TeV-scale masses and considering experimental constraints.

Findings

Scalar leptoquark can significantly modify $B o u ar{ u}$ decay rates.

Current collider and low-energy experiments constrain the leptoquark parameter space.

Potential for observable effects in future B decay measurements.

Abstract

Purely leptonic $B$ meson decays provide unique probes for physics Beyond the Standard Model. We study the impact of a scalar leptoquark, $S_1$, on $B \to \mu \bar\nu$ decay. We find that, for $m_{S_1}\sim 1$ TeV, the $S_1$ leptoquark can modify the $B \to \mu \bar\nu$ rate significantly. Such a leptoquark can in prinicple also alter the $B \to \tau \bar\nu$ rate. However, current searches from LHC and low energy physics provide some constraints on the parameter space.