Speaker
Prof.
Roberto Rossin
(University of Padova and INFN)
Description
We present the first observation of the rare η→μ^+ μ^- μ^+ μ^- double-Dalitz decay. The analysis is based on data collected by the CMS experiment at the CERN LHC operating at the centre-of-mass energy of √s=13 TeV. The data sample was collected with high-rate muon triggers for an integrated luminosity of 101 fb^(-1).
The branching fraction of the η→4μ decay is measured relative to the η→2μ decay yielding a value of B(η→μ^+ μ^- μ^+ μ^- )=[5.0±0.8(stat)±0.7(syst)±0.7(B_2μ )]×10^(-9), in agreement with the Standard Model theoretical predictions.
Authors
Roberto Rossin
(Universita e INFN, Padova (IT))
Prof.
Roberto Rossin
(University of Padova and INFN)
