- th / 0 31 20 51 v 2 2 6 Ja n 20 05 1 In - medium effects on the K − / K + ratio at GSI

- th / 0 31 20 51 v 1 1 5 D ec 2 00 3 1 In - medium effects on the K − / K + ratio at GSI

The in-medium modifications on the K − /K + ratio produced at GSI are studied. Particular attention is paid to the properties of antikaons, which determine the chemical potential and temperature at freeze-out conditions. Different approaches have been considered: non-interacting K − , on-shell self-energy and single-particle spectral density. We observe that the full off-shell approach reproduc...

th / 0 30 20 82 v 1 2 8 Fe b 20 03 K − / K + ratio in heavy - ion collisions at GSI with an antikaon self - energy in hot and dense matter

The K−/K+ ratio produced in heavy-ion collisions at GSI energies is studied. The in-medium properties at finite temperature of the hadrons involved are included, paying a special attention to the in-medium properties of antikaons. Using a statistical approach, it is found that the determination of the temperature and chemical potential at freeze-out conditions compatible with the ratio K−/K+ is...

ar X iv : n uc l - th / 0 50 10 34 v 1 1 2 Ja n 20 05 1 Bound states of Θ + in nuclei

We study the binding energy and the width of the Θ in nuclei, associated to the KN and KπN components. The first one leads to negligible contributions while the second one leads to a sizeable attraction, enough to bind the Θ in nuclei. Pauli blocking and binding effects on the KN decay reduce considerably the Θ decay width in nuclei and medium effects associated to the KπN component also lead t...

ar X iv : n uc l - th / 0 60 10 68 v 1 2 4 Ja n 20 06 Neutrino - nucleus reactions in the energy range 1 - 100 MeV

We review some salient aspects of calculations of the neutrino-nucleus reaction cross sections in the low energy range (1-100 MeV).

uc l - th / 0 30 10 54 v 1 1 6 Ja n 20 03 The ( π − , γγ ) reaction in nuclei and the σ meson in the medium