Münster 2017 – scientific programme
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T: Fachverband Teilchenphysik
T 19: Flavourphysik (Theorie)
T 19.6: Talk
Monday, March 27, 2017, 18:00–18:15, VSH 06
QCD Factorization for B→ππℓν Decays at Large Dipion Masses — •Philipp Böer1, Danny van Dyk2, and Thorsten Feldmann1 — 1Universität Siegen — 2Universität Zürich
B→ππ form factors are an essential non-perturbative ingredient for B→ππℓν decays as well as three-body B→πππ decays. We introduce a factorization formula for these form factors in the limit of large pion energies and large dipion invariant mass. We explicitly check this formula by calculating the leading contributions in a combined expansion in the strong coupling and powers of ΛQCD/mb. Our results provide useful theoretical constraints for phenomenological models that aim to analyze the complete B→ππℓν phase space.