July 31, 2018 to August 6, 2018
Maynooth University
Europe/Dublin timezone

On the rare CP conserving $K \to \pi l^+ l^-$ decays

Aug 2, 2018, 4:20 PM
Hall A (Arts Bldg.)

Hall A

Arts Bldg.

Invited talk B: Light quarks Light quarks


Dr Marc Knecht (CPT/CNRS)


The properties of the form factors describing the rare CP conserving decay modes $K \to \pi l^+ l^-$, $(K,\pi) = (K^\pm,\pi^\pm)$ or $(K_S,\pi^0)$, $l=e,\mu$, are addressed. First, a full two-loop representation of the corresponding form factors in the low-energy expansion is constructed. Next, the contribution from pi-pi intermediate states is considered from a dispersive point of view. Particular attention is given to the matching with the short-distance behaviour of the form factors. Finally, phenomenological aspects of this study are discussed.

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