Speaker
Description
Physical processes involving τ-leptons in the final state play a pivotal role in precision measurements and searches for new physics with the ATLAS experiment. The usage of channels where τ-leptons decay into hadrons exploits the large statistics associated with such decays but requires to estimate a sizable background of hadronic jets misreconstructed as fake τ-leptons.
This talk will present a new technique developed within ATLAS to predict the fake τ-lepton background from data - the Universal Fake Factor method. The method exploits a fake factor whose systematic uncertainty is assessed between 15% and 35%. It improves on previous techniques as it considers the extent to which different jet sources (light quark, gluon, b-quark, and pile-up) originate fake -leptons. Information will be given on ATLAS measurements with single and di- final states that successfully exploited the method, as well as future prospects on its usage in Run 3 ATLAS analyses.
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