New limits on $W_R$ from meson decays

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 $50<m_N\mathrm{/}\mathrm{M}\mathrm{e}\mathrm{V}<1900$ 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.