New limits on $W_R$ from meson decays

TL;DR

This paper uses meson decay data to establish the most stringent experimental limits to date on the mass of the right-handed W boson, $W_R$, in left-right symmetric models, constraining it to be less than about 4-19 TeV.

Contribution

The study introduces a novel method of using pseudoscalar meson leptonic decay data to set new limits on $W_R$ mass, improving upon previous experimental constraints.

Findings

Constraints on $m_{W_R}$ are set to be less than 4-19 TeV at 90% CL.

The analysis covers heavy neutrino masses between 50 MeV and 1900 MeV.

This work provides the most stringent limits on $W_R$ mass from meson decay data to date.

Abstract

In this letter we show that pseudoscalar meson leptonic decay data can be used to set stringent limits on the mass $m_{W_R}$ of a right-handed vector boson, such as the one that appears in left-right symmetric models. We have shown that for a heavy neutrino with a mass $m_N$ in the range $50<m_N/{\rm MeV} <1900$ one can constraint $m_{W_R} \lesssim (4-19)$ TeV at 90 % CL. This provides the most stringent experimental limits on the $W_R$ mass to date.