3 papers
nucl-th2001
Charmonium - Pion Cross Section from QCD Sum Rules
F. S. Navarra, M. Nielsen, R. S. Marques de Carvalho +1
The , and cross sections as a function of are evaluated in a QCD sum rule calculation. We study the Borel…
hep-ph1999
Form Factors and Decay Rates for Heavy Semileptonic Decays from QCD Sum Rules
R. S. Marques de Carvalho, F. S. Navarra, M. Nielsen +2
QCD sum rules for the determination of form factors of and semileptonic decays are investigated. With a form for the baryonic current appropriate for the limits of the…
nucl-th1997
Optimized delta expansion for relativistic nuclear models
G. Krein, R. S. Marques de Carvalho, D. P. Menezes +2
The optimized -expansion is a nonperturbative approach for field theoretic models which combines the techniques of perturbation theory and the variational principle. This techni…