Study of the top reconstruction in top-partner events at the LHC

Details Study of the top reconstruction in top-partner events at the LHC Study of the top reconstruction in top-partner events at the LHC

2008-02-28

arxiv.org/abs/0802.4142v4

JHEP0810:025,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

33 pages, 12 figures, background analyses are added and some parts are revised

Scientific paper

10.1088/1126-6708/2008/10/025

In the Littlest Higgs model with T-parity (LHT), top-partners (T_-) are produced in pairs at the Large Hadron Collider (LHC). Each top-partner decays into a top quark (t) and the lightest T-odd gauge partner A_H. We demonstrate reconstruction of the ttbar system decaying hadronically, and measurement of the top-partner mass from the m_{T2} distribution. A top quark from a T_{-} decay is polarized, and we discuss the effect of this polarization on the decay distributions. Because the events consist of highly collinear jets which occasionally overlap each other, we compare distributions using different jet reconstruction algorithms (Snowmass cone, kt, Cambridge, SISCone). We find clustering algorithms are advantageous for studying top polarization effects.

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