Test of lepton flavor violation with Ke2 decay at KLOE

by Matteo Palutan (LNF-INFN)

Monday 25 May 2009, 16:30 → 17:30 Europe/Zurich

Main Auditorium** (CERN)

A strong interest in a new measurement of the ratio R_K = Gamma Ke2)/Gamma(Kmu2) has recently arisen. The SM prediction of R_K benefits from cancellation of hadronic uncertainties to a large extent, and therefore can be calculated with high precision. Because of the helicity suppression within the SM, the Ke2 amplitude is sensitive to contributions from physics beyond the SM. Recently, it has been pointed out that in a supersymmetric framework, lepton flavor changing processes mediated by the charged Higgs could occur, in particular in the kaon decay to an electron and tau neutrino. In this scenario, deviations of up to few percent on R_K from SM expectation are quite possible. We present a new measurement of the ratio R_K with 1.3% accuracy performed with the KLOE experiment. The result is based on 2.2 fb-1 of data collected at the Frascati e+e- collider DAFNE. The measurement will be described, and its theoretical implications will be discussed.

Joint EP/PP Seminar 2009 http://smaria.home.cern.ch/smaria/ppep/ppep.htm

Poster EPPPSeminar25052009.pdf

Slides palutan_ke2_II.pdf