PhD half-time seminar: Charged Higgs bosons and fat jets in ATLAS
by
Max Isacson(Uppsala Univeristy)
→
Europe/Stockholm
Å12167
Å12167
Description
In the Standard Model of Particle Physics, the masses of particles are generated through electroweak symmetry breaking, of which direct evidence was seen in 2012 with the discovery of the Higgs boson. However the question of whether this is the only Higgs boson, or part of a larger unexplored Higgs sector, remains unanswered. In this seminar I present the results of a search for extra charged Higgs bosons, which naturally arises in several extensions of the Standard Model, using 13.2 /fb of pp collision data recorded by the ATLAS detector during 2015 and the first half of 2016. These result where originally presented at the summer conference ICHEP in August 2016.
More data has since been recorded by ATLAS during the second half of 2016, and a new analysis is planned for the EPS conference in July this year. I will present a proposed redefinition of the event categories used in the ICHEP results, designed to give a better handle on the large irreducible top--anti-top background.
When dealing with heavy resonances the jets originating from hadronic decay products tend to merge into larger radius jets, called large-R jets, or fat jets. To fully reconstruct the decaying resonance one has calculate the mass of these fat jets, which is subject to several systematic uncertainties, in particular the uncertainty in the resolution of the jet mass. I will present a method by which one could estimate this jet mass resolution uncertainty using Monte Carlo simulations of the response of the hadronic calorimeter inside the ATLAS detector.
