NewLightScalar · Search for a new light scalar particle in the K+→π+χ decay at the NA62 experiment at CERN

Search for a new light scalar particle in the K+→π+χ decay at the NA62 experiment at CERN

Models with additional scalars with highly suppressed couplings to the Standard Model (SM) particles are motivated by the existence of a fundamental scalar (Higgs boson) discovered in 2012 at the Large Hadron Collider. The main aim of this project is to observe physics beyond the SM in kaon decays through the search for a new light scalar particle S in the decay K+ → π+ S , S → μ+ μ− at the NA62 experiment at CERN. The scalar search is performed in all the available scalar mass range (2m(μ) < m(S) < m(K) − m(π) ) and for different values of its lifetime τ(S) . In case of discovery, the model-independent value B = BR(K+ → π+ S ) · BR(S → μ+ μ− ) will be claimed. Otherwise, upper limits will be set on B. The K+ → π+ μ+ μ− decay has been chosen for normalisation since it has exactly the same signature as the signal and hence the same trigger stream can be used.

Data: CORDIS, © European Union