Nuclear modification factor in small system collisions within perturbative QCD including thermal effects

In this paper, the nuclear modification factors, RxA, are investigated for pion production in small system collisions, measured by PHENIX experiment at RHIC (Relativistic Heavy Ion Collider). The theoretical framework is the parton transverse momentum kT-factorization formalism for hard processes at small momentum fraction, x. Evidence for collective expansion and thermal effects for pions, produced at equilibrium, is studied based on phenomenological parametrization of blast-wave type in the relaxation time approximation. The dependencies on the centrality and on the projectile species are discussed in terms of the behavior of Cronin peak and the suppression of RxA at large transverse momentum, pT. The multiplicity of produced particles, which is sensitive to the soft sector of the spectra, is also included in the present analysis

O papel do escapismo no ensino de língua inglesa por Roleplaying Games

Several abilities and competencies are needed for the English teaching occur, not only knowledge regarding grammar (KUMARAVADIVELU, 1994), because a language is not only grammaticality. The process of learning a new language entangles areas that inhabits domains such as culture, repertoires (PENNYCOOK, 2018) and discourses (ORLANDI, 1999) of a place. English teaching through roleplaying games (GLASS et. al., 2015) may be used to teach such concepts, which are immanent for students that aim to become a global citizen (GEE, 2009) in a classroom. The undergraduate thesis demonstrates how English teaching through roleplaying games teaches using the students’ imagination, a space where the teaching using RPGs happens. To understand the role that the imagination has during the campaigns, the referential framework explains concepts like escapism (LEVINAS, 2003) and the truthmaker principle (BRICKER, 2015), these concepts are in every RPG campaign unconsciously. The thesis was made based on a study case which was done on the curricular discipline ‘Prática de Ensino e Estágio Supervisionado em Língua Inglesa IV’, it occurred at the end of November, 2018. Through it was concluded that using roleplaying games on English teaching classes is a valid and productive way to teach students. But, the teacher must comprehend how the game mechanics’ work between themselves so that the teacher may best use them.Diversas competências e habilidades são necessárias para que o ensino de língua inglesa ocorra, não apenas relegados à esfera gramatical (KUMARAVADIVELU, 1994), pois a língua em si não é apenas gramaticalidade. O aprendizado de uma língua envolve inúmeras áreas que envolvem diversos elementos como cultura, repertórios (PENNYCOOK, 2018) e discursos (ORLANDI, 1999) de um local. O ensino de língua inglesa por roleplaying games (GLASS et. al., 2015) pode ser usado para ensinar tais conceitos, que são imanentes para que o estudante se torne um cidadão global (GEE, 2009) em sala de aula. O trabalho mostra como o ensino por meio de roleplaying games trabalha com o imaginário dos jogadores, o espaço onde o ensino, por esta abordagem, ocorre. Para entender como o imaginário funciona durante as partidas, o referencial teórico explicita sobre os conceitos de escapismo (LEVINAS, 2003) e truthmaker principle (BRICKER, 2015) que permeiam, inconscientemente, toda a campanha. O estudo foi feito com base em um estudo de caso realizado na disciplina Prática de Ensino e Estágio Supervisionado em Língua Inglesa IV, empreendido ao final de novembro de 2018 e concluiu- se que a abordagem por RPGs é válida e produtiva para com os alunos, se o educador compreender como as mecânicas do jogo conversam entre si para que ele, o professor, possa tirar o melhor de seus estudantes

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

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

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

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

Study of the azimuthal asymmetry in heavy ion collisions combining initial state momentum orientation and final state collective effects

In the present work we investigate the source of azimuthal asymmetry for nuclear collision using a model that contemplates particles produced in the initial hard collisions and the collective effects described by a Blast-Wave like expansion. The latter is described by the relaxation time approximation of the Boltzmann transport equation. The parameters regarding collective flow and asymmetry are fitted by the experimental data from $p_T$ spectrum and $v_2$ for PbPb and XeXe collisions at different centrality classes. As a by-product the ratio of final elliptic flow with the initial anisotropy, $v_2/\epsilon_2$, and the average transverse momentum are predicted.Comment: Version to be published in Physical Review

O TERRITÓRIO CORPORATIVO DA MINERAÇÃO NA SERRA DO BRIGADEIRO, MINAS GERAIS

Resumo: O objetivo deste texto é compreender a instauração de um território corporativo da Companhia Brasileira de Alumínio (CBA) na Serra do Brigadeiro. Para tanto, nos valemos do conceito de Redes Globais de Produção para compreender o sentido desta forma específica de território. O texto foi dividido em três seções, sendo que na primeira delas discutimos os conceitos de território corporativo e Redes Globais de Produção (RGP); na segunda abordamos as características da RGP do alumínio e o lugar do Brasil e da CBA nesta rede; e, por fim, discutimos a territorialidade da CBA na Serra do Brigadeiro. Palavras-chave: Mineração. Redes Globais de Produção. Serra do Brigadeiro. Companhia Brasileira de Alumínio (CBA).   Abstract: The aim of this paper is to understand the establishment of a corporate territory of the Companhia Brasileira de Alumínio (CBA) in the Serra do Brigadeiro. To do so, we use the concept of Global Production Networks (GPN) to understand the meaning of this specific form of territory. The text is divided into three main sections, in the first, we discuss the concepts of corporate territory and GPN; next, we address the characteristics of aluminum RGP and the place of Brazil and CBA in this network; at the end, we discuss the territoriality of CBA in the Serra do Brigadeiro. Keywords: Mining. Global Production Networks. Serra do Brigadeiro. Companhia Brasileira de Alumínio