Exclusive photoproduction of quarkonium in proton-nucleus collisions at energies available at the CERN Large Hadron Collider

In this work we investigate the coherent photoproduction of psi(1S), psi(2S) and Upsilon (1S) states in the proton-nucleus collisions in the LHC energies. Predictions for the rapidity distributions are presented using the color dipole formalism and including saturation effects that are expected to be relevant at high energies. Calculations are done at the energy 5.02 TeV and also for the next LHC run at 8.8 TeV in proton-lead mode. Discussion is performed on the main theoretical uncertainties associated to the calculations.Comment: 05 pages, 5 figures. Version to be published in Phys. Rev.

Light vector meson photoproduction in hadron-hadron and nucleus-nucleus collisions at the energies available at the CERN Large Hadron Collider

In this work we analyse the theoretical uncertainties on the predictions for the photoproduction of light vector mesons in coherent pp, pA and AA collisions at the LHC energies using the color dipole approach. In particular, we present our predictions for the rapidity distribution for rh0 and phi photoproduction and perform an analysis on the uncertainties associated to the choice of vector meson wavefunctionand the phenomenological models for the dipole cross section. Comparison is done with the recent ALICE analysis on coherent production of rho at 2.76 TeV in PbPb collisions.Comment: 07 pages, 6 figures. Version to be published in Phys. Rev.

Diffractive dissociation in proton-nucleus collisions at collider energies

The cross section for the nuclear diffractive dissociation in proton-lead collisions at the LHC is estimated. Based on the current theoretical uncertainties for the single (target) diffactive cross section in hadron-hadron reactions one obtains sigma_SD(5.02 TeV) = 19.67 \pm 5.41 mb and sigma_SD(8.8 TeV) = 18.76 \pm 5.77 mb, respectively. The invariant mass M_X for the reaction pPb -> pX is also analyzed. Discussion is performed on the main theoretical uncertainties associated to the calculations.Comment: 04 pages, 2 figures. Final version to be published in European Physical Journal A - "Hadrons and Nuclei

Gendering Representation: Parties, Institutions, and the Under-Representation Of Women In Brazil's State Legislatures

This dissertation provides insights on what influences women's descriptive representation in state legislatures in Brazil. The study of female representation in Brazil provides for a good case study as the country uses a gender quota system for legislative positions since 1995 and yet has not seen a significant improvement in the number of women elected to such institutions. In order to understand the roots of female under-representation, this dissertation combines Feminist Historical Institutionalism--a complementary approach to Historical Institutionalism that focuses on the role of gender in the development of institutions--and empirical approaches to determine why so few women are elected to Brazil's state legislatures. This dissertation relies on historical narratives, interviews and participant observation, and statistical analysis to uncover the ways in which the Brazilian political system influences the low number of female candidates elected to state legislatures. The focus on state legislatures is warranted as most research on female representation in Brazil has focused on the federal level. I argue that in federal systems like Brazil, where politicians normally rise through local and state politics before becoming federal legislators, scholars must pay closer attention to the electoral dynamics in these lower level elections to fully capture the essence of female representation at the national level. The historical analysis shows that the combination of an electoral system that is mostly unchanged for over 60 years, a legacy of formal and informal discrimination of women in formal politics, and the constant suppression of women's movements throughout the 20th century led to the development of a system that marginalizes women in the present political system. Even as the Brazilian government attempts to address the issue of gender inequality by establishing a gender quota in 1995, women continue to be marginalized from electoral politics. The quota law fails to increase the presence of women in legislatures because the language of the law combined with Brazil well-established electoral rules provides parties with loopholes that allow them to field female candidates but not provide them with the support needed to win the election. The empirical analysis show that political capital--the skills acquired or learned by candidates that make them "electable" in the eyes of political elites, campaign donors, and voters--is key in increasing female representation. The analysis shows, however, that political capital in Brazil is gendered in the sense that the professions that are more likely to raise more campaign funds and more likely to win an elected seat are dominated by male candidates, reinforcing the idea that women are marginalized from electoral politics in Brazil