# Theoretical physics

ITALIAN VERSION

Title Typology Supervisor Description
Top quark phenomenology at LHC: mass measurements interpretation and bottom fragmentation effects in top decay Theoretical

G. Corcella

The mass of the top quark is a fundamental quantity of the Standard Model from which depends e.g. electro-weak vacuum stability. The thesis work consists in studying the uncertainty on the interpretation of the measurements of the top mass in terms of theoretical definitions like the “pole mass” or the “MSbar mass”. In particular, it will be studied the error on the mass due to the hadronization description of bottom quark in top decay.
Study of the production of heavy bosons Z’ at LHC and of their super-symmetric decays in leptophobic models Theoretical

G. Corcella

The study of new heavy bosons Z’, predicted by gauge U(1) theories, is one of the major researches of new physics at LHC; data analyses, performed up to now, have fixed exclusion limits around masses of 3 TeV, assuming that the Z’ can only decay through particles of the Standard Model. The thesis work consists in the study of supersymmetric decays of the Z’, in order to evaluate the impact on the present exclusion limits, and in detail in the phenomenology of the leptophobic models, which suppress the couplings of the Z’ to the leptons of the Standard Model.
Effects of soft-resonances in QCD on partonic densities and extraction of the strong coupling constant from Deep Inelastic Scattering data at large x Theoretical

G. Corcella

A deep knowledge of the Partonic Density Functions (PDF) is fundamental to perform precision measurements at hadronic colliders. Presently, the PDF are determined at fixed orders (NNLO in QCD), even if partonic cross-sections show terms that increase for large values of x-Bjorken, corresponding to the emission of soft gluons, and that have to be re-summed at any order. The thesis work consists in evaluating the effect of soft re-summing in PDF extraction and in the consequent determination of the strong coupling constant from Deep Inelastic Scattering data.