Strong couplings of charmed mesons and quarkonia

Autor(en)

Wolfgang Lucha, Dmitri Melikhov, Hagop Sazdjian, Silvano Simula

Abstrakt

We extract the strong coupling constants of three mesons, each of which is composed of either two charm quarks or one charm quark and one light (i.e., u, d, or s) quark, from the matrix elements for the transitions of two of these mesons induced by appropriate quark currents within the framework of a relativistic dispersion approach to the constituent-quark picture of mesons. Among others, we also analyse the impact of the violation of the SU(3) flavour symmetry by the quark masses. In the case of mesons containing one light quark, we observe, in two respects, discrepancies between our findings and the predictions of QCD sum rules: our strong couplings exceed considerably the ones emerging from QCD sum rules, and, in our approach, the replacement of a light quark by a strange quark entails, in contrast to QCD sum rules, a reduction of the magnitudes of the strong couplings.

Organisation(en)

Teilchenphysik

Externe Organisation(en)

Österreichische Akademie der Wissenschaften (ÖAW), Lomonosov Moscow State University (MSU), Centre National De La Recherche Scientifique (CNRS), Istituto Nazionale di Fisica Nucleare (INFN), Roma

Journal

Proceedings of Science (PoS)

Band

234

Anzahl der Seiten

6

DOI

https://doi.org/10.22323/1.234.0428

Publikationsdatum

2016

Peer-reviewed

Ja

ÖFOS 2012

103034 Teilchenphysik

ASJC Scopus Sachgebiete

General

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/strong-couplings-of-charmed-mesons-and-quarkonia(8f2c9236-280a-4911-8e1a-48396922c99e).html