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 mass \(m_N\) in the range \(50 < m_N/\text{MeV} < 1900\) one can constrain \(m_{W_R} \geq (4-19)~\text{TeV}\) at 90% C.L. This provides the most stringent experimental limit on the \(W_R\) mass to date for this heavy neutrino mass range.