Collective Higgs production in high-energy heavy-ion collisions

In heavy-ion collisions involving the formation of high-energy-density forms of nuclear matter (QGP) the rapid change of the scalar matter density 〈ΨΨ〉 leads to colective and often subthreshold Higgs production. We calculate the rapidly spectra of such Higgs particles qualitatively in the Bjorken collision scenario and, for comparison, in the model of a spherically expanding fireball and consider various options for experiments.