Open-charm systems in cold nuclear matter

M.F.M Lutz,C.L Korpa

doi:10.1016/j.physletb.2005.11.046

Abstract

We study the spectral distributions of charmed meson with JP=0− quantum numbers in cold nuclear matter applying a self-consistent and covariant many-body approach established previously for the nuclear dynamics of kaons. At leading orders the computation requires as input the free-space two-body scattering amplitudes only. Our results are based on the s-wave meson–nucleon amplitudes obtained recently in terms of a coupled-channel approach. The amplitudes are characterized by the presence of many resonances in part so far not observed. This gives rise to an intriguing dynamics of charmed mesons in nuclear matter. At nuclear saturation density we predict a pronounced two-mode structure of the D+ mesons with a main branch pushed up by about 32 MeV. The lower branch reflects the coupling to two resonance-hole states that are almost degenerate. For the D− we obtain a single mode pushed up by about 18 MeV relative to the vacuum mode. Most spectacular are the results for the Ds+ meson. The presence of an exotic resonance-hole state gives rise to a rather broad and strongly momentum dependent spectral distribution.

Highlights

It has been suggested to explore the possible mass modifications of D mesons with the FAIR project at GSI [1]
The two approaches are complementary, with the second focusing on the properties of D mesons in cold nuclear matter
Except for Preprint submitted to Elsevier Science the work by Tolos et al [5] mean field parameterizations were considered

Summary

Introduction

It has been suggested to explore the possible mass modifications of D mesons with the FAIR project at GSI [1]. D+ meson self energy at least for dilute nuclear matter [13,8]. As a consequence of their amplitudes an attractive mass shift of about 10 MeV together with a significant broadening of the D+ is predicted at nuclear saturation density was predicted.

Results

Conclusion