Speaker
Description
The Standard Model of Particle Physics (SM) describes remarkably well all the known fundamental particles and their interactions.
In spite of its large success, it is by now clear that it cannot be the ultimate theory since it fails to explain some observed physical phenomena.
For many years, the Large Hadron Collider (LHC) experiments have tried to identify signs of New Physics but, up to now, no Physics Beyond the Standard Model (BSM) have been discovered, so far.
In many BSM models, new Physics is characterised by a mass scale expected to be higher than the current centre-of-mass energies available at colliders, which may well be the reason why BSM has not been discovered yet.
Nevertheless, even in the case that new particles are too heavy for direct detection at the LHC, a model-independent Effective Field Theory (EFT) approach is a powerful tool to probe the effects of these new particles and/or interactions at low-energy, in the absence of any clue on the full theory underlying the SM.
This project focuses on the search of signs of Physics BSM by studying the $Wtb$ vertex structure in top quark production and decay at the High Luminosity phase of the LHC (HL-LHC).
SM Monte Carlo events, generated at a centre-of-mass energy of $14$ TeV and corresponding to the full expected integrated luminosity at the HL-LHC ($3000$ fb$^{−1}$), were used in the analysis, after passing the simulation of the ATLAS detector.
Several signal regions, corresponding to $t\bar{t}$, single top $t$-channel and associated production $Wt$ semileptonic events, were considered simultaneously in a new approach using a global analysis of several physics channels.
Ultimately, a global fit to specific angular distributions, in all signal regions, will be performed in order to extract the precision with which the EFT Wilson coefficients can be probed up to the HL-LHC.
