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 (4)

• NLO QCD corrections to t tbar + jet production at hadron colliders
• MRST partons generated in a fixed-flavour scheme
• 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 (50)

• Event generation with SHERPA 1.1
• First measurement of the forward-backward charge asymmetry in top quark pair production
• Complete off-shell effects in top quark pair hadroproduction with leptonic decay at next-to-leading order
• Top pair invariant mass distribution: a window on new physics
• NLO QCD corrections to off-shell top-antitop production with leptonic decays at hadron colliders
• Threshold Resummation for the Top Quark Charge Asymmetry
• Measurement of the charge asymmetry in top quark pair production in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector
• Hadronic top-quark pair production in association with a hard jet at next-to-leading order QCD: Phenomenological studies for the Tevatron and the LHC
• Constraining heavy colored resonances from top-antitop quark events
• Top Quark Forward-Backward Asymmetry and Same-Sign Top Quark Pairs
• Massive color-octet bosons and the charge asymmetries of top quarks at hadron colliders
• Top-quark charge asymmetry and polarization in $t\bar{t}{W}^{\pm }$ production at the LHC
• Axigluons cannot explain the observed top quark forward-backward asymmetry
• Tevatron Asymmetry of Tops in a W',Z' Model
• Forward-backward asymmetry of top quark in unparticle physics
• Forward-backward asymmetry and differential cross section of top quark in flavor violating $Z^{\prime }$ model at $\mathcal{O}({\alpha }_s^2{\alpha }_X)$
• Top quark forward-backward asymmetry at Tevatron and its implications at the LHC
• Top Quark Physics at the LHC: A Review of the First Two Years
• Search for resonant t t-bar production in lepton+jets events in pp collisions at sqrt(s) = 7 TeV
• One-side Forward-backward Asymmetry in Top Quark Pair Production at CERN Large Hadron Collider
• LHC signals of the $SO(5)\times U(1)$ gauge-Higgs unification
• Status and Prospects of Top-Quark Physics
• Chiral color symmetry and possible $G^{\prime }$-boson effects at the Tevatron and LHC
• Gluon excitations in t tbar production at hadron colliders
• Data driving the top quark forward--backward asymmetry with a lepton-based handle
• Application of the Principle of Maximum Conformality to the Top-Quark Charge Asymmetry at the LHC
• On mass limit for chiral color symmetry $G^{\prime }$-boson from Tevatron data on $t\bar{t}$ production
• Review of Properties of the Top Quark from Measurements at the Tevatron
• One-side forward-backward asymmetry at the LHC
• Measurement of the energy asymmetry in $t\bar{t}j$ production at 13 TeV with the ATLAS experiment and interpretation in the SMEFT framework
• Renormalization group-induced phenomena of top pairs from four-quark effective operators
• Same-sign Tops: A Powerful Diagnostic Test for Models of New Physics
• Charge asymmetries of top quarks: a window to new physics at hadron colliders
• Distinguishing Flavor Non-universal Colorons from Z' Bosons at the LHC
• Probing Top-philic New Physics via Four-Top-Quark Production
• Climbing to the Top of the ATLAS 13 TeV data
• Evidence for the charge asymmetry in $pp\to t\bar{t}$ production at $\sqrt{s}=13$ TeV with the ATLAS detector
• Implications of effective axial-vector coupling of gluon for $t\bar{t}$ spin polarizations at the LHC
• On the Forward-Backward Asymmetry of Leptonic Decays of $t\bar{t}$ at the Fermilab Tevatron
• Evidence for a Mass Dependent Forward-Backward Asymmetry in Top Quark Pair Production
• Measurement of the $\mathrm{t}\bar{\mathrm{t}}$ charge asymmetry in events with highly Lorentz-boosted top quarks in pp collisions at $\sqrt{s}$ = 13 TeV
• Top Quark Physics at the Tevatron
• Top quark theory review for the Tevatron, LHC, and ILC
• Correlation of top asymmetries: loop versus tree origins
• Experimental Studies of Top Quark Production
• Top quark and Electroweak measurements at the Tevatron
• The ttbar asymmetry in the Standard Model and beyond
• Chiral color symmetry and $G^{\prime }$-boson mass limit from Tevatron data on $t\bar{t}$-production
• Top-quark Polarization and Asymmetries at the LHC in the Effective Description of Squark Interactions
• Anomalous U(1) and Asymmetry