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T: Fachverband Teilchenphysik
T 18: Flavourphysik (Theorie) 1
T 18.8: Talk
Monday, March 4, 2013, 12:45–13:00, WIL-B122
Semileptonic charm decays D→ η(′) l νl — •Florian Porkert, Nils Offen, and Andreas Schäfer — University of Regensburg, Germany
We consider the semileptonic f+D→ η(′)(q2) form factor within the light-cone sum rule (LCSR) formalism including gluonic NLO twist-two corrections. Such semileptonic decays of charm and beauty mesons are important for a sound understanding of the involved weak decay mechanisms and the nonperturbative QCD dynamics in particular. The (planned) high precision measurements at Super KEK B, LHCb and especially the future PANDA experiment may produce the statistics needed to constrain the underlying physics. In this context we discuss the D(s) → η(′) l νl, B → η(′) l νl and D → (π,K) l νl decays within the LCSR formalism emphasizing the possibilities to extract information of the two gluon components of the η, η′ mesons up to leading twist accuracy. We will conclude with a comparison of the LCSR data and the latest lattice results for the D(s) → η(′) l νl decay.