LHCBGAUSS-906 Add BeamSpotMarkovChainSampleVertex
Adds a new beamspot smearing tool that implements a fully correlated (x,y,z,t) sampling using a Markov Chain sampler and a full 4D PDF that describes the intersection of two bunches.
Adds a new beamspot smearing tool that implements a fully correlated (x,y,z,t) sampling using a Markov Chain sampler and a full 4D PDF that describes the intersection of two bunches.