Abstract
In this paper we show that the excess of the τ τ events with respect to the Standard Model background predictions , observed by the ATLAS and CMS collaborations and interpreted as the evidence of the Higgs-boson decay into a pair of τ-leptons, may be accounted for by properly taking into account QED radiative corrections in the modelling of the Z /γ * → τ τ background.
Highlights
The extraction of a H → τ τ signal from the measured mass spectrum of τ τ pairs produced at the Large Hadron Collider (LHC) requires very precise knowledge of the expected H → τ τ and Z /γ ∗ → τ τ mass spectra
In this paper we present an analysis of the effects of QED final-state radiative corrections to the modelling of the Z /γ ∗ → τ τ process, which is the dominant background in the H → τ τ searches
We focus our attention on the radiative corrections to the embedding procedure used by ATLAS and CMS to model the Z /γ ∗ → τ τ background in the extraction of the H → τ τ signal from experimental data
Summary
The extraction of a H → τ τ signal from the measured mass spectrum of τ τ pairs produced at the Large Hadron Collider (LHC) requires very precise knowledge of the expected H → τ τ and Z /γ ∗ → τ τ mass spectra. 4 we present our predictions for the excess of events by properly taking into account radiative photons in the modelling of the Z /γ ∗ → τ τ background We compare this excess with that of the predicted Higgs-boson signal. In the embedding procedure muon tracks and their associated energy depositions in the calorimeters are replaced by a simulated detector response to the final-state particles of the corresponding τ -lepton decays. There are several advantages of the embedding technique: the sensitivity to the Monte Carlo modelling aspects of the hadronic system associated with the Z /γ ∗-boson production is minimised, the pile-up effects are automatically taken into account in the background simulation, including the underlying event activity. As discussed there is a price to pay for such a simplification of the background estimation technique
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
