D^- mesic atoms

TL;DR

This paper models anti-D meson interactions in nuclei using unitarized coupled-channel theory, predicting bound states and energy levels of D^- mesic atoms across various nuclei, revealing potential exotic anti-D N states.

Contribution

It introduces a self-consistent calculation of anti-D meson self-energy considering heavy quark spin symmetry, predicting bound states and energy spectra in nuclei.

Findings

Predicted D^- mesic atom energy levels and widths in multiple nuclei.

Found anti-D^0--nucleus bound states.

Identified possible exotic anti-D N pentaquark states.

Abstract

The anti-D meson self-energy is evaluated self-consistently, using unitarized coupled-channel theory, by computing the in-medium meson-baryon T-matrix in the C=-1,S=0 sector. The heavy pseudo-scalar and heavy vector mesons, anti-D and anti-D^*, are treated on equal footing as required by heavy quark spin symmetry. Results for energy levels and widths of D^- mesic atoms in 12C, 40Ca, 118Sn and 208Pb are presented. The spectrum contains states of atomic and of nuclear types for all nuclei. anti-D^0--nucleus bound states are also obtained. We find that, after electromagnetic and nuclear cascade, these systems end up with the anti-D bound in the nucleus, either as a meson or as part of a exotic anti-D N (pentaquark) loosely bound state.