arXiv subjects

S. Žganec

Publications and source records attributed to S. Žganec.

2 recordsLinked to original sources

arXiv1995

Covariant generalization of the ISGW quark model

A fairly general Lorentz-covariant quark model of mesons is constructed. It has several versions whose nonrelativistic limit corresponds to the well-known Isgur, Scora, Grinstein, and Wise model. In the heavy-quark limit, the covariant model naturally and automatically produces the heavy-quark symmetry results for meson decay constants and semileptonic decay form factors. The meson decay constants and the Isgur-Wise functions are calculated for various versions of the covariant model and compared with other estimates. A general and adaptable structure of the covariant model ensures that it can be used to describe transitions involving light and/or heavy mesons.

hep-ph↗

arXiv1994

Covariant and Heavy Quark Symmetric Quark Models

There exist relativistic quark models (potential or MIT-bag) which satisfy the heavy quark symmetry (HQS) relations among meson decay constants and form factors. Covariant construction of the momentum eigenstates, developed here, can correct for spurious center-of-mass motion contributions.Proton form factor and M1 transitions in quarkonia are calculated. Explicit expression for the Isgur-Wise function is found and model determined deviations from HQS are studied. All results depend on the model parameters only. No additional ad hoc assumptions are needed.

hep-ph↗