Navegação por Assunto "Cromodinâmica quântica"
Resultados 1-20 de 167
-
Additional J/Ψ suppression from high density effects
(2004) [Artigo de periódico]At high energies the saturation effects associated to the high parton density should modify the behavior of the observables in proton–nucleus and nucleus–nucleus scattering. In this paper we investigate the saturation ... -
Amplitudes de espalhamento da cromodinâmica quântica em ordem seguinte à dominante
(2011) [Trabalho de conclusão de graduação]O comportamento das amplitudes de espalhamento em colisões de altas energias é bem entendido atualmente em termos da teoria de Cromodinâmica Quântica (QCD), que descreve a dinâmica dos quarks e glúons. Além disso, sabe-se ... -
Amplitudes de espalhamento na cromodinâmica quântica em altas energias no formalismo de dipolos
(2008) [Tese]Numa colisão hadrônica em altas energias, a densidade de quarks e glúons dentro do hádron cresce rapidamente, o que leva também ao crescimento das seções de choque. Esse comportamento, previsto pela Cromodinâmica Quântica ... -
Análise da estrutura das estrelas de nêutrons e sua relação com o espaço de fase da cromodinâmica quântica
(2022) [Trabalho de conclusão de graduação]Estrelas de nêutrons (NSs) fazem parte do grupo de objetos mais extremos que existem no universo. Com a recente observação de ondas gravitacionais provenientes da colisão entre duas estrelas de nêutrons (evento GW170817), ... -
Análise fenomenológica dos espalhamentos elásticos próton-próton e antipróton-próton em altas energias na representação eiconal
(2016) [Tese]Estudamos os espalhamentos elásticos próton-próton (pp) e antipróton-próton (pp) na representação eiconal por meio das duas principais formulações compatíveis com vínculos de analiticidade e unitaridade: a inspirada na ... -
Analysis of low-x gluon Density from the F/Sub 2/ scaling violations
(1997) [Artigo de periódico]We present an analysis of the current methods of the approximate determination of the gluon density G( X, Q2) at low x from the scaling violations of the proton structure function F2(x,Q2). The gluon density is obtained ... -
Aspectos fenomenológicos do espalhamento elástico próton-próton a altas energias
(2022) [Dissertação]Estudamos a aplicação de um modelo inspirado em QCD para o cálculo da seção de choque total σtot(s) e do parâmetro ρ(s) para o espalhamento elástico pp e pp¯ . Utilizamos uma representação eiconal para a amplitude de ... -
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 ... -
Azimuthal separation in nearly back-to-back jet topologies in inclusive 2- and 3-jet events in pp collisions at √s=13 TeV
(2019) [Artigo de periódico]A measurement for inclusive 2- and 3-jet events of the azimuthal correlation between the two jets with the largest transverse momenta, Δϕ12, is presented. The measurement considers events where the two leading jets are ... -
Backward dilepton production in color dipole and parton models
(2010) [Artigo de periódico]The Drell–Yan dilepton production at backward rapidities is studied in proton-nucleus collisions at Relativistic Heavy Ion Collider and LHC energies by comparing two different approaches: the kT factorization at next-to-leading ... -
Canonical derivation of the gluon propagator in the temporal gauge
(1986) [Artigo de periódico]We reexamine the problem of obtaining, within the operator approach, an unambiguous expression for the longitudinal gluon propagator in the temporal gauge. A regularization procedure respecting Gauss's law and the Hermiticity ... -
Charm and bottom production in inclusive double Pomeron exchange in heavy-ion collisions at energies available at the CERN Large Hadron Collider
(2011) [Artigo de periódico]The inclusive double Pomeron exchange cross section for heavy-quark pair production is calculated for nucleus-nucleus collisions at the Large Hadron Collider. The present estimate is based on hard diffractive factorization, ... -
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 ... -
Charm production in neutral current neutrino-nucleus scattering within the color dipole approach
(2008) [Trabalho completo publicado em evento] -
Charm-quark fragmentation fractions and production cross section at midrapidity in pp collisions at the LHC
(2022) [Artigo de periódico]Recent pT-integrated cross-section measurements of the ground-state charm mesons and baryons, D0, D+, D+s, Λ+c, and Ξ0c, are used to evaluate the charm fragmentation fractions and production cross section per unit of ... -
Coherent and incoherent production of vector mesons in ultraperipheral collisions of xenon ions within the QCD parton saturation approach
(2018) [Artigo de periódico]In this paper, we analyze the exclusive vector meson photoproduction in the recent run using xenon ions at energy of 5.44 TeV performed by the Large Hadron Collider. We focus on the ultraperipheral collisions and provide ... -
Coherent and incoherent Upsilon production in ultraperipheral collisions at the Large Hadron Collider
(2017) [Artigo de periódico]The exclusive photoproduction of ϒðnSÞ states was calculated in ultraperipheral collisions for coherent and incoherent process in PbPb at sNN p ¼ 5.5 TeV. Different dipole models were compared in the theoretical framework ... -
Coherent photon-hadron interactions in pA collisions : small-x physics after HERA
(2006) [Artigo de periódico]In this paper we study the photoproduction of heavy quarks and vector mesons in the coherent proton-nucleus (pA) interactions for RHIC and LHC energies and analyze if these processes can be used to determine the QCD dynamics ... -
Color dipole predictions for the exclusive vector meson photoproduction in pp, pPb, and PbPb collisions at run 2 LHC energies
(2017) [Artigo de periódico]In this paper we present a comprehensive analysis of exclusive vector-meson photoproduction in pp, pPb and PbPb collisions at Run 2 LHC energies using the color dipole formalism. The rapidity distributions and total cross ... -
Constraining gluon distributions in nuclei using dijets in proton-proton and proton-pead collisions at √sNN=5.02 TeV
(2018) [Artigo de periódico]The pseudorapidity distributions of dijets as functions of their average transverse momentum (PTave) are measured in proton-lead (pPb) and proton-proton (pp) collisions. The data samples were collected by the CMS experiment ...