Improving top quark induced charge asymmetries at the LHC using ttbar transverse momentum

Abstract

We study how the significance of top quark induced charge asymmetries at the LHC may be enhanced exploiting the $t\bar{t}$ total transverse momentum to enrich the fraction of quark fusion events in the sample. We combine this variable with previous variables related to the boost and the invariant mass of the $t\bar{t}$ pair to find an optimum cut which maximizes the significance of the asymmetry when systematic and statistic errors are taken into account. We find that including the $t\bar{t}$ transverse momentum in the analysis of the expected 2012 LHC data provides a considerable enhancement in the significance of the asymmetry.

Matches the Physical Review D accepted version. Includes the recent CMS results on the LHC ttbar induced asymmetry in which they use the ttbar transverse momentum for the first time. The results are adapted to their selection efficiency and resolution in ttbar transverse momentum of 20 GeV, which increases still more the enhancement in the significance. 18 pages, 11 figures

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• Top quark pair production at small transverse momentum in hadronic collisions
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• Z' signals in polarised top-antitop final states
• Non-exotic $Z^{\prime }$ signals in ${\ell }^{+}{\ell }^{-}$, $b\bar{b}$ and $t\bar{t}$ final states at the LHC
• Multiple Z' -> t-tbar signals in a 4D Composite Higgs Model
• Enhancing the sensitivity to New Physics in the top-antitop invariant mass distribution
• Top-antitop resonance searches beyond 1 TeV