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Partial decay widths of the heavy-light mesons, $D, D_s, B,$ and $B_s$,emitting one chiral particle ($\pi$ or $K$) are evaluated in the framework of arelativistic potential model. Decay amplitudes are calculated by keeping theLorentz invariance as far as possible and use has been made of theLorentz-boosted relativistic wave functions of the heavy-light mesons. One ofpredictions of our calculation is very narrow widths of a few keV for yetundsicovered $B_s(0^+, 1^+)$ mesons corresponding to ${^{2S+1}L_J}={^3P_0}$ and$"{^3P_1}"$ assuming their masses to be 5617 and 5682 MeV, respectively, ascalculated in our former paper. In the course of our calculation, new sum rulesare discovered on the decay widths in the limit of $m_Q\to \infty$. Among theserules, $ \Gamma(D_{s0}^*(2317)\to D_s+\pi)=\Gamma (D_{s1}(2460)\to D_s^*+\pi) $and $ \Gamma(B_{s0}^*(5615)\to B_s+\pi)=\Gamma (B_{s1}(5679)\to B_s^*+\pi) $are predicted to hold with a good accuracy.

Chiral Particle Decay of Heavy-Light Mesons in a Relativistic Potential Model