76 citations · 127 across the 13 of their papers we have counts for
6 papers · 1 filter
Singular behavior of ^1P_1^{+-} quarkonium and positronium annihilation decays and relevance of relative energy
Dieter Gromes
Using a four dimensional approach, we show that the singularities for small gluon momenta, which arise in the usual three dimensional treatment of the annihilation decay, disappear…
Poincare' invariance constraints on NRQCD and potential NRQCD
Nora Brambilla, Dieter Gromes, Antonio Vairo
We discuss the constraints induced by the algebra of the Poincare' generators on non-relativistic effective field theories. In the first part we derive some relations among the mat…
On the Glue Content in Heavy Quarkonia
Dieter Gromes
Starting with two coupled Bethe-Salpeter equations for the quark-antiquark, and for the quark-glue-antiquark component of the quarkonium, we solve the bound state equations perturb…
Poincare' invariance and the heavy-quark potential
Nora Brambilla, Dieter Gromes, Antonio Vairo
We derive and discuss the constraints induced by Poincare' invariance on the form of the heavy-quark potential up to order 1/m^2. We present two derivations: one uses general argum…
Optimized delta-Expansion in QCD; a challenge
Dieter Gromes
We split the Yang-Mills Lagrangian into a free and an interaction part in such a way, that the free part is non-local and contains an arbitrary form factor. Manifest gauge invarian…
Optimized -Expansion and Triviality or Non-Triviality of Field Theories
D. Gromes
We use a very simple version of the optimized (linear) - expansion by scaling the free part of the Lagrangian with a variational parameter. This method is well suited to calcul…