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Evidence for a Mass Dependent Forward-Backward Asymmetry in Top Quark Pair Production

Evidence for a Mass Dependent Forward-Backward Asymmetry in Top Quark Pair Production,T. Aaltonen

Evidence for a Mass Dependent Forward-Backward Asymmetry in Top Quark Pair Production   (Citations: 8)
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We present a new measurement of the inclusive forward-backward t-tbar production asymmetry and its rapidity and mass dependence. The measurements are performed with 5.3 fb^{-1} of p-pbar collisions at \sqrt{s} = 1.96 TeV, recorded with CDF II at the Fermilab Tevatron. Significant inclusive asymmetries are observed in the laboratory and t-tbar rest frame, and are consistent with CP conservation under interchange of t and tbar. In the t-tbar rest frame, the asymmetry increases with the t-tbar rapidity difference, \Delta(y), and with the invariant mass M_{t-tbar} of the t-tbar system. Parton-level asymmetries are derived in two regions of each variable, and the asymmetry is found to be most significant at large \Delta(y) and M_{t-tbar}. For M_{t-tbar} > 450 GeV/c^2, the parton-level asymmetry in the t-tbar rest frame is A^{t-tbar} = 0.475\pm 0.114 compared to a next-to-leading order QCD prediction of 0.088\pm 0.013.
Published in 2010.
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    • ...Evidence for an anomalous forward-backward t t production asymmetry was observed for large invariant mass of the t t system [1]:...
    • ...However, in a more recent measurement reported in [1] (but not translated to the partonic level) this discrepancy is not present...
    • ...For concreteness, we use the relative uncertainty reported in [1] for the 450-500 GeV Mt t bin (see below), which dominates the uncertainty in the Mt t > 450 GeV range...

    Cédric Delaunayet al. Implications of the CDF forward-backward asymmetry for hard top physic...

    • ...dependence. The asymmetry is more prominent in the large invariant mass region of M t¯ > 450GeV with more than 3� deviation and in the large rapidity difference |�Y | > 1 region with around 2� deviation from the SM predicted value [25]...

    Ketan M. Patelet al. Forward-backward asymmetry in top quark production from light colored ...

    • ...This hope has received a boost by the recent CDF analysis, which showed that the asymmetry arises from t t events with high invariant masses [8]...
    • ...The updated D result, only available integrated over m t t , and uncorrected for eects from reconstruction or selection, A t t = 0:08 0:04 [9], is consistent with the integrated CDF result, A t t = 0:158 0:075 [8]...
    • ...1. The binned t t asymmetry in eq. (1.1) [8];...
    • ...The total asymmetry in each bin is obtained by adding the Standard Model contributions, A t t SM = 0:09 (left) and 0:04 (right) [8]...
    • ...The standard model contributes an additional asymmetry of 0.09 in this bin [8]...
    • ...Table 1. Comparison of the CDF binned asymmetry measurements [8] with the benchmark points in eq. (2.4) for the 3 model...
    • ...Our predictions for the asymmetry include both new physics and standard model contributions [8]...

    Zoltan Ligetiet al. Explaining the forward-backward asymmetry without dijet or flavor anom...

    • ...Several authors [14–20] have explored the possibility of using diquark exchange in the t channel to explain the forward-backward asymmetry observed in pair production of top quarks at the Tevatron [58]...

    Gian Francesco Giudiceet al. Flavourful production at hadron colliders

    • ...FB found a discrepancy of around 2 with respect to the SM prediction [29]; furthermore, the asymmetry is observed to be larger in the region of large invariant mass of the tt pair, and in the region of large rapidity dierence jyt y t j. The t-channel exchange of a W 0 that only couples to...

    Christophe Grojeanet al. A weakly constrained W ′ at the early LHC

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