Abstract
Possible anomalous (or nonstandard) top-quark interactions with the gluon and those with the W boson induced by SU(3)×SU(2)×U(1) gauge-invariant dimension-6 effective operators are studied in pp→tt¯X→ℓ+X′ (ℓ=e or μ) at the Large Hadron Collider (LHC). The final charged-lepton (ℓ+) angular distribution is first computed for nonvanishing nonstandard top-gluon and top-W couplings with a cut on its transverse momentum. The optimal-observable procedure is then applied to this distribution in order to estimate the expected statistical uncertainties in measurements of those couplings that contribute to this process in the leading order.
Highlights
The Large Hadron Collider (LHC) at CERN has been presenting us fruitful experimental data on various particles/processes ever since it started operating, including the historic discovery of the/a Higgs boson [1]
We carried out an optimalobservable analysis (OOA) to show how precisely we could determine those nonstandard couplings in pp → ttX → l+X′ (l = e or μ) under a linear approximation by using the l+ angular and energy distributions, where we took into account possible nonstandard top-W coupling [5]
We show the dR dependence of the angular distribution within the range |dR| ≤ 0.1 [14, 15] in Figs.1–3, where we normalized the distribution by the SM total cross section of the same process but with no pl T constraint: σSM = 134 pb, and varied the cut as pml Tin = 20, 30, 40 GeV for mt = 173 GeV
Summary
The Large Hadron Collider (LHC) at CERN has been presenting us fruitful experimental data on various particles/processes ever since it started operating, including the historic discovery of the/a Higgs boson [1]. Exploring possible new physics beyond the standard model (BSM) is an important mission of the LHC. They have not found so far any exciting signals indicating BSM yet, this fact never means that there do not exist exotic particles since their masses might be too high to be directly produced there. Even in such a case, we still would be able to investigate certain new-physics effects indirectly, using data from the LHC. Essentially-new in comparison with what we have done in [5]
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