Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-03-20
PoSRADCOR2007:010,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
Presented at 8th International Symposium on Radiative Corrections (RADCOR07), 1-5 October 2007, Florence, Italy
Scientific paper
Axigluons are colored heavy neutral gauge boson that are predicted by some theories. The most important model-independent manifestation of axigluons is the generation of a forward--backward asymmetry in top-antitop quark production at $p\bar{p}$ collisions which originates from the charge asymmetry. We update our previous analysis for the inclusive QCD induced forward--backward asymmetry and define a new observable which is more sensitive to the effect than the forward--backward asymmetry. We find a lower limit of 1.4 TeV at 90% C.L. on the axigluon mass from recent measurements of the asymmetry at Tevatron, and extend the analysis to LHC in suitably selected samples. Like at Tevatron, the charge asymmetry can probe larger values of the axigluon mass than the dijet mass distribution.
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