20-27 July 2011
Alpes Congrès - Alpexpo
Europe/Paris timezone

Kaon programme at CERN: recent results and future plans.

22 Jul 2011, 17:05
15m
les Ecrins 3 (Alpes Congrès - Alpexpo)

les Ecrins 3

Alpes Congrès - Alpexpo

Parallel session talk Flavour Physics and Fundamental Symmetries Flavour Physics and Fundamental Symmetries

Speaker

Dr Evgueni Goudzovski (University of Birmingham)

Description

The results from the CERN kaon experiments are presented. A precision test of lepton universality by measurement of the helicity suppressed ratio of kaon leptonic decay rates BR(K --> e nu)/BR(K --> mu nu) has been performed with over 10^5 K+- --> e+- nu decays collected by the NA62 experiment in 2007-08. A record accuracy of 0.4% has been achieved, which constrains the parameter space of new physics models with extended Higgs sector. An improved upper limit on the rate of the lepton number violating decay K+- --> pi-+ mu+- mu+-, which is sensitive to the existence of Majorana neutrinos, has been established with a K+- sample collected by the NA48/2 experiment in 2003-04. A new precise measurement of the K+- --> pi0 mu+- nu (Kmu3) decay form factors with more than 3 million events collected by NA48/2 with a minimum trigger setup is presented, which is an indispensable input for the determination of the CKM matrix element |Vus| from semileptonic kaon decays. Finally, the status of a future experiment aiming to measure the rate of the ultra-rare flavour changing neutral current decay K+ --> pi+ nu nubar to a record 10% precision with a low background sample of about 100 decays is discussed.

Primary authors

Dr Cristina Lazzeroni (University of Birmingham) Dr Evgueni Goudzovski (University of Birmingham)

Presentation Materials