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Recent decades have witnessed remarkable confirmations of the Standard Model(SM) describing the Electro-Weak and Strong Interactions. The Higgs boson wasobserved at CERN-LHC at 7-8 TeV and 13 TeV. The HL-LHC, a major luminosityupgrade has been recently approved. The HL-LHC may be already an early "Higgsfactory", however only capable to perform Ho related measurements with ratherlarge uncertainties because of persisting backgrounds and uncertainties. Newprojects using leptons rather than hadrons should be investigated Ho has a spinzero and its coupling is proportional to the square of the lepton mass, greatlyenhancing the production from pairs of muons. A mu+mu- Collider may operate ata much higher magnetic field respect to the e+e- Collider and it has a smallerradius, easily fitting within one existing European site. However muons areunstable particles: they must be produced in sufficient amounts from pions of aproton beam, cooled and quickly accelerated to the required energies. Thescenario is here primarily concentrated to further developments of the EuropeanSpallation Source (ESS) under construction in the Lund site as the most intensefuture source of spallation neutrons. As a initial part of the program, muoncooling should be experimentally demonstrated with the much cheaper and simplerInitial Cooling Experiment.

Further searches of the Higgs scalar sector at the ESS