The anomalous $Zb\bar{b}$ couplings: From LEP to LHC

Abstract

The bottom quark forward-backward asymmetry ($A_{FB}^b$) data at LEP exhibits a long-standing discrepancy with the standard model prediction. We propose a novel method to probe the $Zb\bar{b}$ interactions through $gg\to Zh$ production at the LHC, which is sensitive to the axial-vector component of the $Zb\bar{b}$ couplings. We demonstrate that the $Zh$ data collected at the 13 TeV LHC can already resolve the apparent degeneracy of the anomalous $Zb\bar{b}$ couplings implied by the LEP precision electroweak measurements, with a strong dependence on the observed distribution of the $Z$ boson transverse momentum. We also show the potential of the HL-LHC to either verify or exclude the anomalous $Zb\bar{b}$ couplings observed at LEP through measuring the $Zh$ production rate at the HL-LHC, and this conclusion is not sensitive to possible new physics contribution induced by top quark or Higgs boson anomalous couplings in the loop.

arXiv comment6 pages, 6 figurs, matches version published in PRL

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• ZH production in gluon fusion at NLO in QCD
• On the NLO QCD Corrections to Gluon-Initiated ZH Production
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• Probing Top-quark Operators with Precision Electroweak Measurements
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• Tracing the bottom electroweak dipole operators at future lepton colliders