Abstract
In this work we investigate the NLO QCD+EW corrections to the top quark pair production and their effects on the spin correlation coefficients and asymmetries at fixed-order top quark pair production and LO decay in the dilepton channel, within the narrow-width approximation. The spin correlations are implicitly measured through the lepton kinematics. Moreover we study the EW effects to the leptonic differential distributions. We find that the EW corrections to the t {bar{t}} production are within the NLO QCD theoretical uncertainties for the spin correlation coefficients and the leptonic asymmetries. On the other hand, for the differential distributions we find that the EW corrections exceed the NLO QCD scale uncertainty band in the high rapidity regimes and are of the order of the NLO QCD scale uncertainty in the case of invariant mass and transverse momentum distributions.
Highlights
As the heaviest particle in the well-established Standard Model of particle physics, the top quark is of interest for investigation for multiple purposes
We focus our study on the spin correlation coefficients, the leptonic asymmetries and normalised differential distributions
In this work we have presented for the first time the completeNLO corrections of the ttproduction to the spin correlation coefficients, the leptonic asymmetries and the differential leptonic distributions
Summary
As the heaviest particle in the well-established Standard Model of particle physics, the top quark is of interest for investigation for multiple purposes. A special attention was brought to one observable, ΔΦ , the angle in the transverse plane of the charged leptons, which was measured by CMS [7] and ATLAS [8] and compared to NLO QCD predictions This was followed by the NNLO QCD study [9], where the specific observable was found to deviate from the Standard Model predictions in the inclusive (unfolded measurements) region, while fitting nicely to the theory predictions in the fiducial region. The different level of agreement of the ΔΦ distribution with the data in the fiducial and the inclusive regime shows that most probably the reason is the use of NLO QCD predictions for the unfolding to the full phase space This is discussed in detail in Ref.
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