Heidelberg 2022 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
T: Fachverband Teilchenphysik
T 8: Higgs Boson: Decay in Fermions 1
T 8.5: Vortrag
Montag, 21. März 2022, 17:15–17:30, T-H21
Signal selection and background estimation for testing CP invariance in vector boson production of the Higgs boson in the H→τlepτhad decay channel using the ATLAS detector — •Helena Moyano, Valerie Lang, Ö. Oğul Öncel, and Markus Schumacher — Albert-Ludwigs-Universität Freiburg
The existence of charge conjugation and parity symmetry (CP) violating processes represents one of the three Sakharov conditions for baryogenesis, the mechanism that explains the different abundances of matter and antimatter in the universe. The Standard Model of particle physics includes a description of CP violating processes, however, their contribution is not sufficient to explain the observed baryon asymmetry in the universe. The discovery of the Higgs boson in 2012 opened the window to search for new sources of CP violation in the production or decay of the Higgs boson.
The analysis exploits Higgs-boson production via vector-boson fusion (VBF) and the decay H→ τlepτhad to search for CP-violating contributions to the HVV vertex based on data collected by the ATLAS detector at √s= 13 TeV corresponding to an integrated luminosity of L=139 fb−1.
This presentation discusses the selection of τlepτhad events with neural networks as well as the estimations of the background contributions. Particularly, first studies will be shown regarding the estimation of the background contribution due to jets misidentified as hadronically decaying τ leptons using the Fake Factor method.