Séminaires, soutenances

Measurement of the Higgs self-coupling through same-charge di-leptons channel in the ATLAS experiment at the LHC

par océane Perrin (LPC Clermont)

Europe/Paris
9109 (salle)

9109

salle

Description

Ten years ago, a bosonic particle with a mass equals to 125GeV has been osbserved by ATLAS and CMS collaborations at the Large Hadron Collider (LHC). This particle was associated with the Higgs Boson or Brout-Englert-Higgs boson, predicted fifty years before its discovery. This particle validates the BEH mechanism, explaining the origin of the mass of known particles and the electroweak symmetry breaking. So this discovery is a key measurement to probe our well-known Standard Model.


Since this discovery, physicists have been trying to probe the various properties that we confer to the Higgs boson, including the Higgs self-coupling. The success in probing Higgs self-coupling will bring another probe of the standard model and will give a direct measurement of the Higgs field potential in the vacuum. This measurement is performed through a global analysis of the di-Higgs (HH) production at LHC, decaying into various
channels. In this study, the analysis has been done through the signature 2 leptons with the same charge from the Run II, representing around 10% of the leptonic decays of the Higgs pair.