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R. Markazi

Publications and source records attributed to R. Markazi.

6 recordsLinked to original sources
arXiv2018

Insight on confinement using scalar field interactions

The scalar field plays an fundamental role in the investigation of confinement property characterising many particle physics models. This is achieved by coupling this particle directly with gauge fields at the lagrangian level. We have adopted the same approach {[}10{]} to determine a potential as a perturbative series in terms of interquark distance. In order to introduce the gravitational effects and inspired from bag models, we implement a scalar field which interacts both with the vacuum and the electron field. In this context and with presence of the vacuum condensates, it is possible to derive a more accurate expression of the electron energy.

hep-ph↗
arXiv2018

Implications of dilaton couplings on the axion potential

In particle physics and cosmology, the dilaton is an hypothetical scalar field which can explain many physical phenomena. In this framework, we investigate an extended lagrangian of QCD which involves dilatonic degrees of freedom. Our approach is based on the relationship between the massive dilaton and the nonperturbative effects of QCD. We derive a general axion potential involving the dilaton properties and vacuum condensates.

hep-th↗
arXiv2001

On the dilaton and the axion potentials

We extend the Vecchia-Veneziano-Witten (VVW) model of QCD in the chiral limit and for large colour number $N_c$, by introducing an effective dilaton-gluon coupling from which we derive both the axion and dilaton potentials. Furthermore, using a string inspired model, we determine a new interquark potential as a perturbative series in terms of the interquark distance $r$. Our potential goes beyond Dick one obtained in [8] and shares the same features as the Bian-Huang-Shen potential $V_{BHS}$ which depends only on odd powers of $r$ [22].

hep-th↗
arXiv2000

On the confining potential in 4d $SU(N_c)$ gauge theory with dilaton

Using the formal analogy between the Dick superstring inspired model of ref.[6] and the problem of building of Eguchi Hanson metric in 4d N=2 harmonic superspace (hs), we derive a general formula for the quark-quark interaction potential V(r) including the Dick confining potential. The interquark potential V(r) depends on the dilaton-gluon coupling and may be related to the parameterization of confinement by the quark and gluon vacuum condensates. It is also shown how the axion field may be incorporated in agreement with 10d type IIB superstring requirements. Others features are also discussed.

hep-th↗
arXiv1998

More Insight into Heavy Quark Masses from QCD

Using the non-relativistic version of Borel sum rules, combined to the very accurate experimental information on the Charmonium and Upsilon spectra, we rigorously investigate the Euclidean mass of the Charm and Bottom quark. Our analysis is performed with an improved expansion of the heavy current correlator in the infinite heavy quark mass limit. The optimal results, which take into account the most recent world average values of the strong coupling constant, as well as a conservative range of the gluon condensate, are: m_c^Eucl=1.20+-0.034 GeV and m_b^Eucl=4.18+-0.037 GeV. Their conversions to the corresponding pole mass and running mass give respectively: M_c=1.49+-0.08 GeV, M_b=4.65+-0.06 GeV and m_c(m_c)=1.21+-0.08 GeV, m_b(m_b)=4.20+-0.06 GeV in good agreement with the most recent direct estimates.

hep-ph↗