![]() A much stronger conservation law is the total number of leptons of all flavors, which is violated by a tiny amount in the Standard Model by the so-called chiral anomaly. Conservation of the number of leptons of different flavors (for example, electron number or muon number) may sometimes be violated (as in neutrino oscillation). This principle is known as conservation of lepton number. ![]() When particles interact, generally the number of leptons of the same type (electrons and electron neutrinos, muons and muon neutrinos, tau leptons and tau neutrinos) remains the same. The masses of the leptons also obey a simple relation, known as the Koide formula, but at present this relationship cannot be explained. The charged leptons have two possible spin states, while only one helicity is observed for the neutrinos (all the neutrinos are left-handed, and all the antineutrinos are right-handed). All known charged leptons have a single unit of negative or positive electric charge (depending on whether they are particles or antiparticles) and all of the neutrinos and antineutrinos have zero electric charge. All six of these particles have corresponding antiparticles (such as the positron or the electron antineutrino). The other is a nearly massless neutral particle called a neutrino (such as the electron neutrino). One is a massive charged particle that bears the same name as its flavor (like the electron). Each flavor is represented by a pair of particles called a weak doublet. His current research focuses on measuring the properties of the Higgs boson couplings to leptons as well as leading the ATLAS group responsible for the detection and characterization of hadronically-decaying tau leptons.There are three known flavors of lepton: the electron, the muon, and the tau lepton or tau (or sometimes tauon). Since 2013, Buat has been a research fellow first at Simon Fraser University and then at CERN, where he led the ATLAS group studying Higgs boson couplings to leptons. He completed his PhD in 2013 at the Université de Grenoble, France where he searched for physics beyond the Standard Model in high-mass diphoton events at the LHC. Quentin Buat is a postdoctoral research fellow at Stony Brook University, working on the ATLAS experiment at CERN. Finally, I will review the challenges of hadronic tau signatures in the ATLAS trigger system. I will review the modern machine learning algorithms employed to distinguish them from QCD jets and identify the various decay modes and discuss the usage of these algorithms in selected ATLAS data analyses. In this talk, I will discuss the strategy employed by the ATLAS experiment to detect, characterize and calibrate hadronic tau leptons. As such, the hadronic tau leptons play an important role in the ATLAS physics program. Hadronic decays of the tau lepton occur almost twice as often as leptonic ones and experimentally carry more information about the properties of the particle the tau lepton originates from. ![]() As a third-generation fermion, the tau often has enhanced interactions with beyond the Standard Model physics additionally, its high mass of 1.7 GeV makes it a key Higgs decay channel.
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