Würzburg 2018 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 85: Experimentelle Methoden III
T 85.3: Vortrag
Donnerstag, 22. März 2018, 17:05–17:20, Z6 - SR 1.013
Development of a new Soft Muon Tagger for ATLAS Run 2 — Julien Caudron1, Markus Cristinziani1, Mazuza Ghneimat1, Carlo A. Gottardo1, Sebastian Heer1, Vadim Kostyukhin1, Ö. Oğul Öncel1,2, Arshia Ruina1, and •Andrea Sciandra1 — 1Physikalisches Institut, Universität Bonn — 2Institut für Kernphysik, Universität zu Köln
The identification of b-quark initiated jets (b-tagging) plays a fundamental role at LHC, as it helps in the identification of heavy particles that decay to bottom quarks, as for instance the top quark, the Higgs boson or heavy exotic particles. The Soft Muon Tagger (SMT) allows to identify jets from b-quarks taking advantage of the presence of a muon originating from b-hadron semileptonic decays. I will describe the development of a new b-tagging algorithm in ATLAS that takes advantage of the jet-muon angular distance. Despite the low BR(b→µ X), the discriminating power of the muon and vertex variables is remarkable to reject light jets.
A performance enhancement has been obtained for all light rejection woking points through the implementation of the SMT output in the ATLAS baseline b-tagging algorithm MV2. A good modelling of input and output variables will be shown, comparing simulation to Run 2 data.