Wuppertal 2015 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 3: Neue Physik: vektorartige Quarks, Z’, W’
T 3.1: Vortrag
Montag, 9. März 2015, 14:00–14:15, L.09.31 (HS 11)
A search for high-mass resonances decaying into τ+τ− final states with the ATLAS detector — •Dirk Duschinger1, Arno Straessner1, Wolfgang Mader1, and Marcus Morgenstern2 for the ATLAS collaboration — 1IKTP, TU Dresden — 2CERN, Geneva
Searches for new heavy resonances decaying to tau-lepton pairs are both theoretically and experimentally well motivated. Additional heavy Z′ gauge bosons appear in many models and are one of the best motivated extensions of the standard model. Z′ bosons often arise in grand unified theories and while they are typically considered to obey lepton universality, this is not necessarily a requirement. In particular, some models, offering an explanation for the high mass of the top quark, predict that such bosons preferentially couple to third-generation fermions.
The search for high-mass resonances decaying into τ+τ− final states with the ATLAS detector is presented. The data were recorded in proton-proton collisions at √s = 8 TeV produced by the Large Hadron Collider and correspond to an integrated luminosity of 19.5−20.3 fb−1. The τhadτhad, τµτhad and τeτhad channels are analyzed. Z′ bosons are interpreted in the sequential standard model (SSM) as well as in the non-universal G(221) model, which provides enhanced couplings to third-generation fermions, and results are shown. In addition, studies on the impact of the fermionic couplings on the SSM Z′ acceptance are presented.