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Autor:
Prosperi, G. M.
In ordinary Quantum Mechanics only ideally instantaneous observations of a quantity or a set of compatible quantities are usually considered. In an old paper of our group in Milano a formalism was introduced for the continuous monitoring of a system
Externí odkaz:
http://arxiv.org/abs/1508.06428
Publikováno v:
Phys.Rev.D77:034013,2008
In this paper we extend the work synthetically presented in Ref.[1] and give theoretical details and complete tables of numerical results. We exploit calculations within a Bethe-Salpeter (BS) formalism adjusted for QCD, in order to extract an ``exper
Externí odkaz:
http://arxiv.org/abs/0705.1695
Publikováno v:
Phys.Rev.Lett.99:242001,2007
We exploit theoretical results on the meson spectrum within the framework of a Bethe-Salpeter (BS) formalism adjusted for QCD, in order to extract an ``experimental'' coupling \alpha_s^{exp}(Q^2) below 1 GeV by comparison with the data. Our results f
Externí odkaz:
http://arxiv.org/abs/0705.0329
Publikováno v:
AIPConf.Proc.892:340-342,2007
In the framework of the Bethe-Salpeter formalism used in previous papers to evaluate the quarkonium spectrum, here we reverse the point of view to extract an ``experimental'' running coupling alpha_s(Q^2) in the infrared (IR) region from the data. Th
Externí odkaz:
http://arxiv.org/abs/hep-ph/0611087
Publikováno v:
Prog.Part.Nucl.Phys.58:387-438,2007
We try to review the main current ideas and points of view on the running coupling constant in QCD. We begin by recalling briefly the classic analysis based on the Renormalization Group with some emphasis on the exact solutions of the RG equation for
Externí odkaz:
http://arxiv.org/abs/hep-ph/0607209
Autor:
Baldicchi, M., Prosperi, G. M.
In line with some previous works, we study in this paper the meson spectrum in the framework of a second order quark-antiquark Bethe-Salpeter formalism which includes confinement. An analytic one loop running coupling constant alpha_s(Q), as proposed
Externí odkaz:
http://arxiv.org/abs/hep-ph/0412359
Autor:
Baldicchi, M., Prosperi, G. M.
A previous method for handling bound states in QCD is briefly revisited. Taking advantage of the Feynman-Schwinger representation for the iterated quark propagator in an external field, it is possible to give closed representations for certain approp
Externí odkaz:
http://arxiv.org/abs/hep-ph/0310213
Autor:
Baldicchi, M., Prosperi, G. M.
We study the effect of the infrared behavior of the running coupling constant on the quark-antiquark spectrum.
Comment: 3 pages. 1 figure, talk given at the 5th International Conference "Quark Confinement and the Hadron Spectrum", September 10-1
Comment: 3 pages. 1 figure, talk given at the 5th International Conference "Quark Confinement and the Hadron Spectrum", September 10-1
Externí odkaz:
http://arxiv.org/abs/hep-ph/0302047
Autor:
Prosperi, G. M.
I revue the so called Wilson loop approach to bound state problem in QCD. I shall show how using appropriate path integral representations for the quark propagator in an external field it is possible to obtain corresponding path integral representati
Externí odkaz:
http://arxiv.org/abs/hep-ph/0202186