Abstract
We investigate the differences between the light-cone distribution amplitudes (LCDAs) of Bs mesons and Bq mesons (with q = u, d) induced by a non-vanishing strange-quark mass ms ≠ 0 (compared to mq ≃ 0). To this end, we consider the so-called “radiative tail” which is related to the short-distance expansion of the relevant light-ray operators in heavy-quark effective theory. We extend the calculation of the according matching coefficients, including operators linear in ms for both the leading and sub-leading 2-particle LCDAs. Based on a generic parameterization for the leading LCDA, we discuss the effect on its shape on a quantitative level, and compare our findings with recent results on the inverse moments of the Bq and Bs LCDAs from QCD sum rules.
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Acknowledgments
We thank Danny van Dyk for a critical reading of the manuscript and for helpful comments. This research is supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under grant 396021762 — TRR 257.
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Feldmann, T., Lüghausen, P. & Seitz, N. Strange-quark mass effects in the Bs meson’s light-cone distribution amplitude. J. High Energ. Phys. 2023, 75 (2023). https://doi.org/10.1007/JHEP08(2023)075
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DOI: https://doi.org/10.1007/JHEP08(2023)075