Münster 2017 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 104: Suche nach neuen Teilchen 5
T 104.1: Vortrag
Donnerstag, 30. März 2017, 16:45–17:00, JUR 2
Search for a heavy resonace Z′ decaying into T′t at √s = 13 TeV with the CMS experiment — •Anna Benecke, Johannes Haller, Andreas Hinzmann, and Roman Kogler — Institut für Experimentalphysik, Universität Hamburg
Many models of physics beyond the Standard Model predict vector-like quarks (T′) and a new heavy gauge boson (Z′). While decays of the Z′ and T′ into Standard Model particles have been already studied, no experimental results for the decay Z′ → tT′ with T′ → Ht,Zt are available
so far.
In this talk a search for a heavy spin-1 resonace Z′ decaying into T′t at √s = 13 TeV with the CMS experiment is presented.
Two decays of the T′ quark to third generation Standard Model quarks are considered: T′ → Ht and T′ → Zt.
Due to the large mass of the T′ the H and Z bosons receive a large Lorentz boost and the decay products of the bosons appear as a single merged jet. Jet substructure techniques are used to identify these jets. The performance of the taggers is evaluated by measurements of the efficiency and the mistag rate.
Sidebands are used to test the simulation of the Standard Model backgrounds in this search.
The reconstruction of the Z′ mass is done with a χ2 method, and the distribution obtained is used to test for deviations from Standard Model predictions.