Hamburg 2016 – scientific programme

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T: Fachverband Teilchenphysik

T 2: Higgs-Boson (Zerfall in Tau-Leptonen) I

T 2.3: Talk

Monday, February 29, 2016, 11:30–11:45, VMP5 HS A

Study of Z boson events in the decay to a tau lepton pair in the semileptonic channels with the CMS experiment at 13 TeV — •Valeria Botta — DESY, Hamburg

The talk focuses on the commissioning of the tau lepton objects using Z boson events as standard candle, which is the first step towards the analysis of the Higgs boson decays to a pair of tau leptons. The analysis is performed with data from proton-proton collisions at a centre-of-mass energy of 13 TeV, recorded with the CMS detector at the LHC during 2015. Semileptonic final states are considered, in which one tau lepton decays to hadrons and the other one decays to a muon or an electron (and neutrinos). The presence of an isolated lepton in the final state provides a handle for triggering and rejecting the background from QCD processes. The trigger and lepton identification efficiencies have been measured with a tag-and-probe method using electron and muon pairs from Z boson decays. The cross section of Z-boson production in the di-tau final state has been measured and compared to standard model predictions.