Speaker
Dosbol Baigarashev
(JINR)
Description
The main goal of the NA62 experiment at CERN is to measure the probability of the ultra-rare K^{+} → π^{+}vv decay. The collected statistics for 2016-2018 years, allows us to analyze other rare decays, in particular, K^{+}→e^{+}v µ^{+}µ^{−}. Since the inner bremsstrahlung (IB) for K^{+}→e^{+}v µ^{+}µ^{−} decay is suppressed (0.03%), this decay is well suited for measuring form factors (F_{V} , F_{A}, and R). The chiral perturbative theory (ChPT) prediction of the decay probability K^{+}→e^{+}v µ^{+}µ^{−} with a value of 1.12 ∗ 10^{−8} is known. The previous experimental result is (1.7±0.5) ∗ 10^{−8} . We present the research methodology, the first results of signal selection, and the study of the background sources for the decay.
