Abstract
Based on a realistic meson-exchange model for ππ scattering in free space we study medium modifications for low partial waves in cold nuclear matter. With increasing density a strong accumulation of strength near threshold and eventually a series of bound states is found in the s-wave. The ϱ resonance in the p-wave is shifted to higher energy which, in turn, influences the s-wave through t-channel exchange. For the d-wave f 2 meson a significant narrowing of the width is found at higher densities. We also estimate the in-medium K +K − production cross section which may play a role in ultrarelativistic heavy-ion collisions.
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