Lepton Flavor violation searches with kaons at NA62

✍ Scribed by G. Saracino

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 310 KB
• Volume: 187
• Category: Article
• ISSN: 0920-5632
• DOI: 10.1016/j.nuclphysbps.2009.01.012

✦ Synopsis

The ratio R K = Γ(K ± → e ± ν)/Γ(K ± → μ ± ν) between the two leptonic decay rates of charged kaons is precisely predicted within the Standard Model (SM). A recent theoretical work noticed that SUSY extensions of the SM can induce mu-electron universality violation in such a way to introduce a shift of the R K value up to few percent respect to SM prediction. Presently the experimental relative error of RK , that includes also the last two recent measurements from NA48 and KLOE, is around 1.5%. A new precise measurement of R K can be of extreme interest in order to have a more stringent test of the SM. During summer 2007 the NA62 collaboration performed a dedicated period of measurements at the CERN SPS in order to achieve both the statistical and systematic accuracy for a 0.5% relative error. A sample of about 110000 K + → e + ν decays has been collected and special runs dedicated to the study of the main sources of systematic effects have been performed. The experimental set-up and the analysis strategy will be described.