H1prelim-07-064

Events with an Isolated Tau Lepton and missing transverse momentum at HERA

Reference Ytsen DeBoer, presented at DIS '07, Spring 2007
Document Conference paper or talk
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Contact G. Brandt, C. Diaconu
Abstract A search for the production of tau leptons in ep collisions with the H1 detector at HERA is presented. A data sample corresponding to a total integrated luminosity of 471 pb-1 taken in the years 1994-2007 is analysed, representing the full HERA I+II high-energy data set. Tau leptons are identified using an identification algorithm based on the search for isolated charged tracks associated to narrow hadronic jets detected in the calorimeters, a typical signature of the one-prong hadronic tau decay. In the region where the hadronic system X has a transverse momentum PTX 25 GeV one event is observed in the data where the Standard Model (SM) expectation is 0.99+-0.13 events.
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