Foreword

Abstract

Carlos, in Brazil, twenty five talks, and twenty seven posters. The I LAWHEP took place in Porto Alegre, from 1 st to 3 rd December 2005, at the Instituto Latinoamericano de Estudos Avançados, ILEA, from the Universidade Federal do Rio Grande do Sul. It was partially supported by CNPq, and by UFRGS, USP, UFRJ, FURG, and it required some investment from all of the participants. The level of the presentations was very high, with lively discussions. The poster sessions had a full attendance. A committee of lecturers has chosen the best posters (in terms of physical content and presentation). The prize for the best poster was given to Diego Gratieri, from Unicamp, advised by Orlando Peres; mentions were given to Bruno Taketani, from UFRJ, advised by Eduardo Fraga, and Beatriz Siffert, from UFRJ, advised by João R.T. de Mello and Maurício Calvão. The LAWHEP has an important role in the community of high-energy latinoamerican phenomenologists. It is dedicated to update the contributions to this field, to promote scientific interactions within the community, to create the possibility of new exchanges and collaborations, and to foster contacts with experimentalists as well. The contributions to the meeting are presented in these proceedings, based on the refereeing standards of the Brazilian Journal of Physics, with the encouragement of professor Silvio Salinas, and the efficiency of Neusa Martin. It is important to mention that from our proposal to the colleagues and the meeting itself we just had two months to organize this event, which demonstrates how motivated, mature, organized and cooperative is the community in this area of physics in Latin America. The event was chaired by M.

Evolution of heavy quark distribution function on quark-gluon plasma: Using the Iterative Laplace Transform Method

“…The collisional energy loss of a heavy quark with energy E and mass M in a thermalized medium with temperature T has been calculated in several papers with different approaches [40]. In our calculations, the collisional energy loss of HQs in QGP by considering "Hard and Soft Thermal Loops" are given as follows [41].…”

“…where v is the HQ speed, α s is the strong coupling constant, n f is the number of quark flavors in the medium, E and M are energy and mass of the propagated HQ respectively, m g = (1 + n f /6)g 2 T 2 /3 is the thermal gluon mass, g = √ 4πα s is the gauge coupling parameter and B(v) is a smooth velocity function, which can be taken approximately as 0.7 [41].…”