Charmed scalar mesons and related

TL;DR

This paper investigates charmed scalar mesons, proposing a four-quark structure for certain states, predicting new narrow scalar mesons, and highlighting their significance in charm meson decays.

Contribution

It introduces a four-quark model for charmed scalar mesons, predicts additional narrow scalar mesons, and explores their role in charm meson weak decays.

Findings

Identification of a charmed strange meson as a four-quark state

Prediction of additional narrow scalar mesons

Demonstration of four-quark mesons' role in charm decays

Abstract

Charmed scalar mesons are studied. By assigning the newly observed charmed strange meson with a narrow width to one of the iso-triplet four-quark mesons, decays of the multiplet members are investigated and, as the consequence, existence of additional narrow scalar mesons is predicted. Decays of the ordinary charmed scalar mesons are also studied. In addition, it is demonstrated that four-quark mesons can play an important role in hadronic weak decays of charm mesons.