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- W2047047352 abstract "We study the charge asymmetry between the $t$ and $bar t$ quark at the LHC, when they are produced in association with a $W$ boson. Though sizably reducing the cross section with respect to the inclusive production, requiring a $W$ boson in the final state has two important implications. First, at leading order in QCD, $t bar t W^{pm}$ production can only occur via $q bar q$ annihilation. As a result, the asymmetry between the $t$ and $bar t$ generated at NLO in QCD is significantly larger than that of inclusive $t bar t$ production, which is dominated by gluon fusion. Second, the top quarks tend to inherit the polarization of the initial-state quarks as induced by the $W$-boson emission. Hence, the decay products of the top quarks display a sizable asymmetry already at the leading order in QCD. We study the relevant distributions and their uncertainties in the standard model, compare them to those obtained in a simple axigluon model and discuss prospects for measurements at the LHC and beyond." @default.
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- W2047047352 date "2014-09-01" @default.
- W2047047352 modified "2023-10-16" @default.
- W2047047352 title "Top-quark charge asymmetry and polarization in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML altimg=si1.gif overflow=scroll><mml:mi>t</mml:mi><mml:mover accent=true><mml:mrow><mml:mi>t</mml:mi></mml:mrow><mml:mrow><mml:mo stretchy=false>¯</mml:mo></mml:mrow></mml:mover><mml:msup><mml:mrow><mml:mi>W</mml:mi></mml:mrow><mml:mrow><mml:mo>±</mml:mo></mml:mrow></mml:msup></mml:math>production at the LHC" @default.
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- W2047047352 doi "https://doi.org/10.1016/j.physletb.2014.07.033" @default.
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