Banca de DEFESA: JUAN DAVID FONSECA JAMAICA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : JUAN DAVID FONSECA JAMAICA
DATA : 27/08/2021
HORA: 14:00
LOCAL: Por participação remota
TÍTULO:

INDIRECT MEASUREMENTS OF CROSS-SECTIONS IN COLLISIONS OF EQUAL MASS FERMIONS USING QUANTUM ENTANGLEMENT WITH A WITNESS PARTICLE

PÁGINAS: 50
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Física
SUBÁREA: Física das Partículas Elementares e Campos
ESPECIALIDADE: Teoria Geral de Partículas e Campos
RESUMO:

We consider a general QED scattering process between two fermions with the same mass, A and B, one of which is initially entangled with a witness particle, C. The latter does not participate in the collision. The final state of C is evaluated usaing standard S matrix formalism and we show that for certain configurations of spin entanglement, it contains information about the dynamics of the AB scattering. As an illustration  we use electron, positron -> muon, antimuon (inelastic scattering), as well as the elastic processes Bhabha and Moeller scatterings. We show that spin measurements on the particle C can be effected to deleiver information on the cross section. We verify how such measurements are related by an observer in the center-of-mass frame and another moving perpendicularly to the the direction before the collision through Wigner rotations. The quantum correlations are evaluated considering a unitary process to this order in perturbation theory via the von Neumann entropy.

MEMBROS DA BANCA:
Membro Titular - Examinador(a) Interno ao Programa - 1939597 - ANDRE GUSTAVO SCAGLIUSI LANDULFO
Membro Titular - Examinador(a) Interno ao Programa - 1574260 - ROLDAO DA ROCHA JUNIOR
Presidente - Externo à Instituição - BRIGITTE HILLER - UC