Speaker
Dr
Cristina Lazzeroni Lazzeroni
(University of Birmingham)
Description
We report on measurements of the rare decays K+- -> pi+- e+ e- and
K+- -> pi+- mu+ mu-. The full NA48/2 data set was analyzed, leading
to more than 7200 reconstructed events in the electronic and more than
3000 events in the muonic channel, the latter exceeding the total existing
statistics by a factor of five. For both channels the selected events are almost
background-free. From these events, we have determined the branching
fraction and form factors of K+- -> pi+- e+ e- using different theoretical models.
Our results improve the existing world averages significantly. In addition,
we measured the CP violating asymmetry between K+ and K- in this channel
to be less than a few percent.
Primary author
Dr
Cristina Lazzeroni Lazzeroni
(University of Birmingham)
