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One of the most remarkable results of astro-particle Physics has been the success of the Standard Model (SM), recently culminated with the discovery of the Higgs particle (H). With the CERN-LHC, the H is observable in few channels and in the presence of substantial backgrounds.
The European Spallation Source may provide an adequate intensity and repetition rate of protons for the first time, such as to produce the very strong and isolated Higgs scalar signal in the pure s-state, in unique conditions of cleanliness with the help of an additional μ+μ- collider ring 100 times smaller than the LHC.
The properties of the Higgs boson could then be detailed with high precision and over a larger fraction of parameter space than at any other proposed accelerator and offer greater potential for distinguishing between a standard SM and other alternative mechanisms. Easily fitting within the ESS site, muon-cooling, if successful, would have a much lower cost and it could be constructed far more quickly than for instance any future Ring or Linear Collider of large dimensions.
In addition to the H, a neutrino factory (NF) is an important new alternative for ESS, in which high-energy cooled muon decays produce intense beams of neutrinos and antineutrinos.
In order to demonstrate its experimental the feasibility, an Initial Cooling Experiment in a muon-cooling ring of ≈250 MeV/c and ≈ 30 m circumference is here proposed.