Charge asymmetries of top quarks: a window to new physics at hadron colliders

Abstract

With the next start of LHC, a huge production of top quarks is expected. There are several models that predict the existence of heavy colored resonances decaying to top quarks in the TeV energy range. A peak in the differential cross section could reveal the existence of such a resonance, but this is experimentally challenging, because it requires selecting data samples where top and antitop quarks are highly boosted. Nonetheless, the production of such resonances might generate a sizable charge asymmetry of top versus antitop quarks. We consider a toy model with general flavour independent couplings of the resonance to quarks, of both vector and axial-vector kind. The charge asymmetry turns out to be a more powerful observable to detect new physics than the differential cross section, because its highest statistical significance is achieved with data samples of top-antitop quark pairs of low invariant masses.

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Cited by in corpus (11)

• $A_{FB}^t$ Meets LHC
• Heavy colored resonances in top-antitop + jet at the LHC
• Top quark forward-backward asymmetry and W^prime bosons
• Top Quark Physics at the Tevatron
• Interpretations and Implications of the Top Quark Rapidity Asymmetries $A_{FB}^t$ and $A_{FB}^{\ell }$
• Improving top quark induced charge asymmetries at the LHC using ttbar transverse momentum
• Tau lepton charge asymmetry and new physics at the LHC
• Constraining Unparticles from Top Physics at TeVatron
• Probing new physics with tau-leptons at the LHC
• Anomalous U(1) and Asymmetry
• Asymmetry at LHC for an U(1)' anomalous extension of MSSM