Influence of multiple scattering on particle decays in a medium

Abstract

Impact of scattering in matter on particle decays at high energy is studied. The consistent method of the calculation of the decay probability of the particles scattered multiply elastically in an equilibrium medium is developed. The decay probability of such particles is obtained. The Dalitz decay of a pion in the matter is studied.

Suppression of Soft Nuclear Bremsstrahlung in Proton-Nucleus Collisions

“…Implications for neutron-star cooling due to the LPM effect on soft neutrino emission rates have been studied for the process of neutrino pair bremsstrahlung [9]. The general importance of coherence effects on the production and absorption of any kind of particle in (non)equilibrium dense matter has been discussed in terms of classical transport models and within a field theory approach [10][11][12].…”

“…Implications for neutron-star cooling due to the LPM effect on soft neutrino emission rates have been studied for the process of neutrino pair bremsstrahlung [9]. The general importance of coherence effects on the production and absorption of any kind of particle in (non)equilibrium dense matter has been discussed in terms of classical transport models and within a field theory approach [10][11][12].Soft radiation from high-energy nuclear collisions has been debated previously [13]; however, no quantitative analysis of the LPM effect in a strongly interacting dense matter system has been reported so far. For this purpose nuclear bremsstrahlung may be a suitable example accessible to experimental verification.…”

“…This suppression has been reported for pair creation from cosmic-ray photons [3], and for bremsstrahlung from high-energy electrons [4] in accelerator experiments. The general importance of coherence effects on particle production and absorption in (non-)equilibrium dense matter has been discussed in the literature [5][6][7]. Such effects are, e.g., relevant for soft photon and dilepton production in hot hadronic matter [8,9].…”