Wuppertal 2015 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 36: SUSY: stop, squarks, Zerfälle in OS Leptonen, Photonen
T 36.4: Vortrag
Montag, 9. März 2015, 17:30–17:45, K.11.20 (K5)
Search for the top quark SUSY partner with the HEPTopTagger in ATLAS — Christoph Anders, •Maddalena Giulini, Sebastian Schätzel, and André Schöning — Physikalisches Institut, Universität Heidelberg
One of the possible ways of searching for SUSY is to look for the direct pair production of the top scalar partner, called stop (t), which is foreseen by many SUSY models to be the lightest squark. This particle can decay into a top quark and a neutralino via t→ t χ10. The stop pair production final state is characterized by the presence of two neutralinos and two top quarks. In the channel where both top quarks decay hadronically, the kinematics of the two quarks can be fully reconstructed. Hence it has the advantage that the missing transverse energy only depends on the neutralino pair kinematics.
If the stop-neutralino mass difference is large, the daughter top quark obtains enough transverse momentum for its decay products to be collimated. In this case, the significance of this search could be improved by requiring a reconstructed top quark candidate in each event using the HEPTopTagger algorithm (Plehn et al. JHEP 1208 (2012) 091). This algorithm is able to reconstruct hadronically decaying top quarks with moderate momenta (pT>200 GeV).
The results of searching for direct stop production with the HEPTopTagger are presented.