Color dipole phenomenology and the saturation physics applied to soft processes in the high energy regime

Neste trabalho investigamos as interações hadrônicas soft usando o formalismo de saturação partônica relativo a evolução não-linear da QCD (Cromodinâmica Quântica), em conjunto com a teoria de Regge, a qual e o formalismo padrão para o cálculo de fenômenos difrativos. O principal objetivo e descrever as seções de choque total e el astica, bem como o slope el astico, para espalhamentos m eson-pr oton e b arion-pr oton no regime de altas energias. Para isso, usamos os seguintes modelos de satura c~ao: Glauber-Mueller, Golec-Biernat e Wusto (GBW) e b-CGC. Todos eles s~ao baseados no modelo de dipolos de cor, sendo este um formalismo adequado para descrever intera c~oes entre part culas no limite de altas energias. Resultados num ericos s~ao comparados aos dados experimentais dispon veis no Large Hadron Collider (LHC), e tamb em a medidas de raios c osmicos. Estudamos a depend^encia das amplitudes de dipolo no par^ametro de impacto, analisando o comportamento de cada modelo em rela c~ao a esta quantidade. Al em disso, comparamos os modelos de satura c~ao, de forma que seja poss vel determinar qual deles apresenta a melhor resposta em altas energias.In this work we investigate soft hadronic interactions using the parton saturation formalism in accordance with non-linear QCD (Quantum Chromodynamics) evolution, along with Regge phenomenology, which is the standard approach to calculate di ractive phenomena. The main goal is to describe the total and elastic cross sections as well as the elastic slope for meson-proton and baryon-proton scattering at high energy regime. For this purpose, we used the following saturation models: Glauber-Mueller, Golec-Biernat and Wusto (GBW) and b-CGC. All of them are based on the color dipole model, which is a good formalism to describe particle interations in the high energy limit. Numerical results are compared to available experimental data from the Large Hadron Collider (LHC), and cosmic rays data as well. We study the impact parameter dependence of the dipole amplitudes, investigating how each model behaves in terms of this variable. In addition, we compare the saturation models and analyze which one has the best response in the high energy regime

Investigating the inclusive transverse spectra in high-energy pp collisions in the context of geometric scaling framework

The presence of geometric scaling within the pT spectra of produced hadrons at high energy pp collisions using small-x kT-factorization is investigated. It is proposed a phenomenological parameterization for the unintegrated gluon distribution in the scaling range that reproduces the features of the differential cross section both in the saturated and dilute perturbative QCD regimes. As the saturation scale acts as an effective regulator of the infrared region, the extension of the model to quantities usually associated to soft physics is studied. The approach is applied to compute the average pT and the rapidity distribution of produced gluons at high energies

Investigating the diffractive gluon jet production in lepton-ion collisions

We study the diffractive jet production in electron-ion collisions in the kinematic region where the mass MX of the diffractive final state is larger than Q2. Based on parton saturation framework, predictions are done for the kinematics of future or possible eA machines as the EIC, LHeC, HE-LHeC, and FCC-eA. We analyze the differential cross section as a function of jet (gluon) transverse momentum and from the experimental point of view this observable could be used to extract the saturation scale as a function of xIP

Exclusive dilepton production via timelike Compton scattering in heavy ion collisions

In the present work, kT -factorization formalism is applied to compute the exclusive dilepton production by timelike Compton scattering (TCS) in eA, pA, and AA collisions. The nuclear effects are investigated considering heavy and light ions. The production cross section in terms of the invariant mass and rapidity distribution of the lepton pair is shown. The analysis is done for electron-ion collisions at the Large HadronElectron Collider (LHeC), its high-energy upgrade (HE-LHeC), and at the Future Circular Collider (FCC) in lepton-hadron mode. Additionally, ultraperipheral heavy ion collisions at future runs of the Large Hadron Collider (LHC) and at the FCC (hadron-hadron mode) are also considered

Exclusive Z0 production in ep and eA collisions at high energies

In this work the k⊥-factorization formalism is applied to compute the exclusive Z0 boson photoproduction in ep and eA collisions. The study is also extended to pp and AA processes. The nuclear effects are investigated considering heavy and light ions. Analytical models for the unintegrated gluon distribution are taken into account and the corresponding theoretical uncertainty is quantified. The analysis is done for electron-ion collisions at the Large Hadron-Electron Collider, its high-energy upgrade and at the Future Circular Collider in lepton-hadron mode. Additionally, ultra-peripheral heavy ion collisions at future runs of the Large Hadron Collider and at the Future Circular Collider (hadron hadron mode) are also considered

Dilepton production through timelike compton scattering within the kT-factorization approach

In this work we consider the dilepton production via timelike Compton scattering (TCS) in electronproton and proton-proton collisions. In particular, the differential cross section in terms of the dilepton invariant mass and rapidity is computed within the kT-factorization approach. Besides, we utilize distinct unintegrated gluon distributions (UGD) in order to compare their impact on the differential cross section of TCS in pp (ep) collisions evaluated at the LHC (LHeC), HL-LHC (LHeC), HE-LHC (LHeC), and FCC-hh (eh) center-of-mass energie

Soft diffraction within the QCD color dipole picture

In this work we consider the QCD parton saturation models to describe soft interactions at the high energy limit. The total and elastic cross sections, as well as the elastic slope parameter, are obtained for proton-proton and pion-proton collisions and compared to recent experimental results. The analyses are done within the color dipole formalism, taking into account saturation models which have been tested against deep inelastic scattering data. The main point is that the matching between soft and hard interaction occurs in the saturation region which can be described by high density QCD approaches. Discussion is performed on the main theoretical uncertainties associated with calculations

Color dipole phenomenology and the saturation physics applied to soft processes in the high energy regime

Neste trabalho investigamos as interações hadrônicas soft usando o formalismo de saturação partônica relativo a evolução não-linear da QCD (Cromodinâmica Quântica), em conjunto com a teoria de Regge, a qual e o formalismo padrão para o cálculo de fenômenos difrativos. O principal objetivo e descrever as seções de choque total e el astica, bem como o slope el astico, para espalhamentos m eson-pr oton e b arion-pr oton no regime de altas energias. Para isso, usamos os seguintes modelos de satura c~ao: Glauber-Mueller, Golec-Biernat e Wusto (GBW) e b-CGC. Todos eles s~ao baseados no modelo de dipolos de cor, sendo este um formalismo adequado para descrever intera c~oes entre part culas no limite de altas energias. Resultados num ericos s~ao comparados aos dados experimentais dispon veis no Large Hadron Collider (LHC), e tamb em a medidas de raios c osmicos. Estudamos a depend^encia das amplitudes de dipolo no par^ametro de impacto, analisando o comportamento de cada modelo em rela c~ao a esta quantidade. Al em disso, comparamos os modelos de satura c~ao, de forma que seja poss vel determinar qual deles apresenta a melhor resposta em altas energias.In this work we investigate soft hadronic interactions using the parton saturation formalism in accordance with non-linear QCD (Quantum Chromodynamics) evolution, along with Regge phenomenology, which is the standard approach to calculate di ractive phenomena. The main goal is to describe the total and elastic cross sections as well as the elastic slope for meson-proton and baryon-proton scattering at high energy regime. For this purpose, we used the following saturation models: Glauber-Mueller, Golec-Biernat and Wusto (GBW) and b-CGC. All of them are based on the color dipole model, which is a good formalism to describe particle interations in the high energy limit. Numerical results are compared to available experimental data from the Large Hadron Collider (LHC), and cosmic rays data as well. We study the impact parameter dependence of the dipole amplitudes, investigating how each model behaves in terms of this variable. In addition, we compare the saturation models and analyze which one has the best response in the high energy regime