Hamburg 2016 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 32: Flavourphysik (Theorie)
T 32.9: Vortrag
Montag, 29. Februar 2016, 18:45–19:00, VMP8 SR 106
Standard Model Wilson coefficients for c → u ℓ+ ℓ− transitions at next-to-leading order — Stefan de Boer1, •Bastian Müller2, and Dirk Seidel3 — 1TU Dortmund — 2Uni Siegen — 3Uni Siegen
The standard theoretical framework to deal with exclusive, weak decays of heavy mesons is the so-called weak effective Hamiltonian. It involves the short-distance Wilson coefficients, which depend on the renormalization scale µ. For specific calculations one has to evolve the Wilson coefficients down from the electroweak scale µW to the typical mass scale of the decay under consideration. This is done by solving a renormalization group equation for the effective operator basis.
In this talk the results of a consistent two-step running of the c → u ℓ+ ℓ− Wilson coefficients are presented. This running involves the intermediate scale µb (with µW > µb > µc) where the bottom quark is integrated out. All the matching coefficients and anomalous dimensions are taken to the required order by generalizing and extending results from b → s or s → d transitions available in the literature.