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T: Fachverband Teilchenphysik
T 29: Flavourphysik (Theorie)
T 29.2: Vortrag
Montag, 24. März 2014, 17:00–17:15, P6
The B-Meson Distribution Amplitude and its "Dual" — •Thorsten Feldmann1, Guido Bell2, Björn Lange1, Yu-Ming Wang3,4, and Matthew Yip5 — 1Theoretische Physik 1, Universität Siegen — 2Rudolf Peierls Centre for Theoretical Physics, Univ. Oxford — 3Institut für Theoretische Physik E, RWTH Aachen — 4Physik Department, TU München — 5IPPP, Univ. Durham
Light-cone distribution amplitudes (LCDAs) for B-mesons in heavy-quark effective theory (HQET) provide one of the essential non-perturbative inputs entering QCD factorization theorems for exclusive B decays. In this talk we show how to derive the eigenfunctions of the Lange-Neubert evolution equation which governs the behaviour of the B-meson LCDAs under a change of renormalization scale. The spectrum of the LCDA with respect to these eigenfunctions defines a "dual" function which renormalizes multiplicatively. In terms of these dual functions, renormalization-group improved factorization formulas take a very simple form. We also report on how to implement perturbative constraints from the operator product expansion in HQET within our new formalism.