Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 31: Flavour physics II

T 31.9: Vortrag

Dienstag, 16. März 2021, 18:00–18:15, Tf

QCD Sum Rules for Parameters of the B-meson Distribution Amplitudes — •Muslem Rahimi and Marcel Wald — Theoretische Physik 1, Naturwissenschaftlich-Technische Fakultät, Universität Siegen, Germany

We obtain new estimates for the parameters λ_E², λ_H² and their ratio R = λ_E²/λ_H², which appear in the second moments of the B-meson light-cone distribution amplitudes defined in the heavy-quark effective field theory.

The computation is based on two-point QCD sum rules for the diagonal correlation function and includes all contributions up to mass dimension seven in the operator-product expansion. For the ratio we get R = (0.1 ± 0.1) with λ_E² = (0.01 ± 0.01)   GeV² and λ_H² = (0.11 ± 0.02)   GeV².