Hamburg 2016 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 32: Flavourphysik (Theorie)

T 32.5: Vortrag

Montag, 29. Februar 2016, 17:45–18:00, VMP8 SR 106

Higher-Twist Effects in the B → π Transition Form Factor from QCD Light-Cone Sum Rules — Alexander Khodjamirian and •Aleksey Rusov — Universität Siegen Fakultät IV/Department Physik Theoretische Physik 1 Walter-Flex-Straße 3 57068 Siegen

I will report on the progress in calculating new higher-twist corrections to the QCD light-cone sum rule for the B → π transition form factor. First, the expansion of the massive heavy-quark propagator in the external gluonic field near the light-cone was extended to include new terms containing the gluon-field strength derivatives. The resulting analytical expressions for the twist-5 and twist-6 contributions to the correlation function were obtained in a factorized approximation, expressed via the product of the quark-condensate density and the lower-twist pion distribution amplitudes. The numerical analysis of new higher-twist effects is in progress.