Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-07-07
JHEP 1109:007,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages with 5 figures
Scientific paper
10.1007/JHEP09(2011)007
We present a phenomenological analysis of the recent Tevatron results on the $t \bar t$ forward-backward asymmetry and invariant-mass spectrum assuming a new contribution from an s-channel gluon resonance with a mass in the range from 700 to 2500 GeV. In contrast to most of the previous works, this analysis shows that for masses below ~1 TeV resonant New Physics could accommodate the experimental data. In general, we find that axial-like couplings are preferred for light and top quark couplings, and that only top quark couples strongly to New Physics. We find that composite model scenarios arise naturally from only phenomenological analyses of the experimental results. We show that our results are compatible with recent LHC limits in dijet and $t \bar t$ production, and find some tension for large resonance mass ~2.5 TeV. We indicate as best observables for discriminating a relatively light new gluon a better resolution in CDF forward-backward asymmetry, as well as the $t \bar t$ charge asymmetry and invariant-mass spectrum at the LHC.
Alvarez Ezequiel
Rold Leandro Da
Sanchez Vietto Juan Ignacio
Szynkman Alejandro
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