Top Quarks, Axigluons and Charge Asymmetries at Hadron Colliders

Abstract

Axigluons are colored heavy neutral gauge boson that couple to quarks through an axial vector current and the same strong coupling as gluons. 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. Furthermore, we find a lower limit of 1.2 TeV at 90% C.L. on the axigluon mass from recent measurements of the asymmetry at Tevatron. Also at LHC, the charge asymmetry is sizable in suitably selected samples. We evaluate this asymmetry in the central region for different selection cuts and show that, like at Tevatron, the charge asymmetry can probe larger values of the axigluon mass than the dijet mass distribution.

13 pages, 9 figures

References in corpus (3)

• NLO QCD corrections to t tbar + jet production at hadron colliders
• Top production at the Tevatron/LHC and nonstandard, strongly interacting spin one particles
• LHC physics: the first one--two year(s)

Cited by in corpus (6)

• First measurement of the forward-backward charge asymmetry in top quark pair production
• Threshold Resummation for the Top Quark Charge Asymmetry
• Constraining heavy colored resonances from top-antitop quark events
• Status and Prospects of Top-Quark Physics
• Chiral color symmetry and possible $G^{\prime }$-boson effects at the Tevatron and LHC
• Charge asymmetries of top quarks: a window to new physics at hadron colliders