Searches for the $t^\prime$ of a fourth family

Details Searches for the $t^\prime$ of a fourth family Searches for the $t^\prime$ of a fourth family

2011-01-20

arxiv.org/abs/1101.3844v2

Phys.Rev.D83:114031,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 4 eps figures, 5 Tables, publication version

Scientific paper

10.1103/PhysRevD.83.114031

We study the detection of the $t^\prime$ of a fourth family during the early running of LHC with 7 TeV collision energy and 1 fb$^{-1}$ integrated luminosity. By use of a neural network we show that it is feasible to search for the $t'$ even with a mass close to the unitarity upper bound, which is in the 500 to 600 GeV range. We also present results for the Tevatron with $10 \,\, \textrm{fb}^{-1}$. In both cases the search for a fourth family quark doublet can be significantly enhanced if one incorporates the contribution that the $b'$ can make to a $t'$-like signal. Thus the bound on the mass of a degenerate quark doublet should be stronger than the bounds obtained by treating $t'$ and $b'$ in isolation.

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