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Open Access Publications from the University of California

Search For Exotic Physics In The 2+ Top-Tag, 2+ B-Tag Channels Of The Four Top Quark Final State In 20.3 Fb−1of Pp Collisions At √S = 8 Tev With The ATLAS Detector

  • Author(s): Manning, Peter Michael
  • Advisor(s): Seiden, Abraham
  • et al.

We present a search for new exotic physics in pp collisions at √s = 8 TeV recorded by the ATLAS detector at the Large Hadron Collider (LHC) at CERN. Our search is focusing on the production of four top-quark final states. Specifically, we are looking for events with two or more top-quarks produced with very high transverse momentum, tagged using jet substructure variables. Events with at least two top-tagged jets are also required to have at least two b-tagged jets, with a further requirement that one of the b-tagged jets lie outside the conical radius of the top-tagged jets. Finally, we look in events that have a large amount of total transverse momentum (HT) that is optimized for several potential new signal models (low HT and high HT). In a data sample of 20.3 fb-1 we measured an expected background of 13.04 ± 3.150+3.925-4.751 events in the low-HT channel and measured an expected background of 5.024 ± 1.918+1.753-2.971 events in the high-HT channel. We expect to set a limit on the Kaluza-Klein mass scale mKK > 1.06 TeV at the 95% CL assuming no excess of or deficit of events are seen in the data.

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