Navegação Ciências Exatas e da Terra por Assunto "Funcoes de estrutura"
Resultados 1-11 de 11
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Aspects of the unitarized soft multipomeron approach in DIS and diffraction
(2002) [Artigo de periódico]We studyin detail the main features of the unitarized Regge model (CFKS), recentlyprop osed to describe the small-Q2 domain. It takes into account a two-component description with two types of unitarized contributions: one ... -
Charm production in diffractive deep inelastic scattering
(2004) [Artigo de periódico]The diffractive open charm production is computed in perturbative QCD formalism and in the Regge approach. The results are compared with recent data on charm diffractive structure function measured at DESY–HERA. Our results ... -
Constraining the free parameter of the high parton density effects
(2000) [Artigo de periódico]The high parton density effects are strongly dependent of the spatial gluon distribution within the proton, with radius R, which cannot be derived from perturbative QCD. In this paper we assume that the unitarity corrections ... -
Describing F/sub 2/ through s finite sum of gluon ladders
(2002) [Artigo de periódico]Electroproduction in deep inelastic scattering at HERA is studied in a model considering a finite sum of gluon ladders, associated with a truncation of the BFKL series. The approach contains the bare two gluon exchange and ... -
Geometric scaling in inclusive charm production
(2003) [Artigo de periódico]We show that the cross section for inclusive charm production exhibits geometric scaling in a large range of photon virtualities. In the DESY ep collider HERA kinematic domain the saturation momentum Q2 sat x stays below ... -
Neutral current neutrino-nucleus interactions at high energies
(2009) [Artigo de periódico]We present a QCD analysis of the neutral current (NC) neutrino-nucleus interaction at the small-x region using the color dipole formalism. This phenomenological approach is quite successful in describing experimental results ... -
A phenomenological analysis of the longitudinal structure function at small x and low Q2
(2004) [Artigo de periódico]The longitudinal structure function in deep-inelastic scattering is one of the observables from which the gluon distribution can be unfolded. Consequently, this observable can be used to constrain the QCD dynamics at small ... -
Scaling violation and shadowing corrections at HERA
(1999) [Artigo de periódico]We study the value of shadowing corrections (SC) in the HERA kinematic region in the Glauber{ Mueller approach. Since the Glauber{Mueller approach was proven in perturbative quantum chromodynamics (QCD) in the double-logarithmic ... -
Seeking the shadowing in eA processes
(1999) [Artigo de periódico]We consider the behavior of the slope of the nuclear structure function F2A in the kinematic region which will be explored in the eA HERA collider. We demonstrate that, similarly to the nucleon case, a ‘‘turn over’’ is ... -
Small x nuclear shadowing in deep inelastic scattering
(1999) [Artigo de periódico]We estimate the perturbative nuclear shadowing in the nuclear structure function FA₂(x,Q²), mainly at the kinematic region of HERA using the Glauber-Mueller approach. The contributions of the quark and gluon sectors to the ... -
Unitarity corrections to the structure functions through the dipole picture
(2002) [Artigo de periódico]We study the dipole picture for the description of deep inelastic scattering, focusing on the structure functions which are driven directly by the gluon distribution. One performs estimates using the effective dipole cross ...
