Zobrazeno 1 - 10
of 280
pro vyhledávání: '"Ripka, G."'
Publikováno v:
Phys.Rev. D71 (2005) 114010
This work is devoted to the study of diquark correlations inside the nucleon. We analyze some matrix elements which encode information about the non-perturbative forces, in different color anti-triplet diquark channels. We suggest a lattice calculati
Externí odkaz:
http://arxiv.org/abs/hep-ph/0410304
Autor:
Ripka, G.
The lectures, delivered at ECT (European Centre for Theoretical Studies in Nuclear Physics and Related Areas) in Trento (Italy) in 2002 and 2003, are addressed to physicists who wish to acquire a minimal background to understand present day attempts
Externí odkaz:
http://arxiv.org/abs/hep-ph/0310102
Publikováno v:
Few Body Syst.Suppl. 14 (2003) 1-6
We describe the formation of solitons in NJL-type models and discuss the influence of the regularization scheme on the stability of the solution. We concentrate on models with non-local regulators in which stable solutions exist without introducing a
Externí odkaz:
http://arxiv.org/abs/hep-ph/0212077
Autor:
Ripka, G.
The quantum fluctuations of the quark condensate are calculated using a regulated Nambu Jona-Lasinio model. The corresponding quantum fluctuations of the chiral fields are compared to those which are predicted by an ''equivalent'' sigma model. They a
Externí odkaz:
http://arxiv.org/abs/hep-ph/0007250
Autor:
Ripka, G.
Publikováno v:
Nucl.Phys.A683:463-486,2001
The quantum fluctuations of the quark condensate are studied in a Nambu Jona-Lasinio model. Two Lorenz invariant regularizations are considered: a sharp 4-momentum cut-off and a soft gaussian regulator. The quantum fluctuations of the quark condensat
Externí odkaz:
http://arxiv.org/abs/hep-ph/0003201
Publikováno v:
Nucl.Phys. A608 (1996) 411-436
The effects of meson loops in the vacuum sector of the Nambu--Jona-Lasinio model are calculated. Using the effective action formalism we take consistently all next-to-leading-order $1 \over \Nc$ terms into account. This leads to a symmetry-conserving
Externí odkaz:
http://arxiv.org/abs/hep-ph/9602274
Publikováno v:
Z.Phys. A354 (1996) 421-429
We analyze the analytic structure of meson propagators in the Nambu--Jona-Lasinio model with a proper-time regulator. We show that the regulator produces unphysical complex singularities. As a result the naive use of the Wick rotation is no longer al
Externí odkaz:
http://arxiv.org/abs/hep-ph/9509363
Autor:
Ball, R. D., Ripka, G.
The momentum dependence of the quark self energy gives a physically motivated and consistent regularization of both the real and imaginary parts of the quark loop contribution to the meson action. We show that the amplitudes for anomalous processes a
Externí odkaz:
http://arxiv.org/abs/hep-ph/9312260
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