Abstract
We derive a QCD sum rule for the inverse moment of the Bs-meson light-cone distribution amplitude in HQET. Within this method, the SU(3)f l symmetry violation is traced to the strange quark mass and to the difference between strange and nonstrange quark condensate densities. We predict the ratio of inverse moments λBs /λB = 1.19 ± 0.14 which can be used in various applications of these distribution amplitudes to the analyses of Bs-meson decays, provided an accurate value of λB is available from other sources, such as the B → ℓνℓγ decay.
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Khodjamirian, A., Mandal, R. & Mannel, T. Inverse moment of the Bs-meson distribution amplitude from QCD sum rule. J. High Energ. Phys. 2020, 43 (2020). https://doi.org/10.1007/JHEP10(2020)043
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DOI: https://doi.org/10.1007/JHEP10(2020)043