# Recent Results from Kaon Physics

Experimental Particle Physics seminar

#### Recent Results from Kaon Physics

• Event time: 1:00pm until 2:00pm
• Event date: 2nd November 2007
• Speaker: Cristina Lazzeroni (Birmingham University)
• Location: Room 3317,

### Event details

A review of recent results on kaon physics is presented.

Firstly, results on kaon semileptonic decays are summarised and a value for the CKM matrix element $V_{us}$ is extracted, compatible at 1 $\sigma$ with that expected from CKM unitarity. Then precision data on $K_{l3}$ and $K_{l2}$ decay rates are presented and tests for new physics searches are discussed.

Finally, preliminary results on the $K_{e4}$ decay $K^\pm \rightarrow \pi^+ \pi^- e^\pm \nu$ are summarised. The $\pi\pi$ scattering lengths $a^0_0$ and $a^2_0$ can be extracted from the $K_{e4}$ phase shift and from the slope change in the $M^2_{00}$ distribution of $K^\pm \rightarrow \pi^0 \pi^0 \pi^\pm$ decays. Future prospects on kaon physics are also briefly revised.

### About Experimental Particle Physics seminars

The experimental particle physics seminar series invites speakers from all over Europe to discuss the latest developments at the LHC, accelerator and non-accelerator based neutrino physics, hardware R&D and astroparticle physics. .