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We investigate the differences between the light-cone distribution amplitudes(LCDAs) of $B_s$ mesons and $B_q$ mesons (with $q=u,d$) induced by anon-vanishing strange-quark mass $m_s\neq 0$ (compared to $m_q \simeq 0$). Tothis end, we consider the so-called ''radiative tail'' which is related to theshort-distance expansion of the relevant light-ray operators in heavy-quarkeffective theory. We extend the calculation of the according matchingcoefficients, including operators linear in $m_s$ for both the leading andsub-leading 2-particle LCDAs. Based on a generic parameterization for theleading LCDA, we discuss the effect on its shape on a quantitative level, andcompare our findings with recent results on the inverse moments of the $B_q$and $B_s$ LCDAs from QCD sum rules.

Strange-quark mass effects in the $B_s$ meson's light-cone distribution amplitude