Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-09-05
Nuovo Cim.B123:1211-1218,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages, 6 figures. Submitted to the proceedings of TOP2008, Isola d'Elba, Italy
Scientific paper
10.1393/ncb/i2008-10687-2
Top quarks produced in pairs are predicted to experience spin correlations. Due to the large ttbar statistics expected for the LHC, it should be possible to search for new physics effects in angular variables sensitive to these correlations. We investigate, for a general two-Higgs Doublet Model (2HDM), the charged Higgs boson decay of the top quark through the channel $t\to bH^+\to b\tau^+\nu_\tau$. Analytic results are presented on the spin analyzing coefficients for this decay mode. We then explore in some detail the correlation phenomenology in the Type II 2HDM. Finally we present a hadron-level Monte Carlo analysis, illustrating distributions in azimuthal angles which are sensitive to correlations in the transverse plane. These observables are accessible also in the tau channel, and are therefore particularly interesting for analyzing the $t\to bH^+$ decay.
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