AnomalousZbb¯Couplings: From LEP to LHC,Physical Review Letters

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AnomalousZbb¯Couplings: From LEP to LHC
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-07-27 , DOI: 10.1103/physrevlett.127.051801
Bin Yan ₁ , C-P Yuan ₂

Affiliation

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

Z b \bar{b}

interactions through

g g \to Z h

production at the LHC, which is sensitive to the axial-vector component of the

Z b \bar{b}

couplings. The apparent degeneracy of the anomalous

Z b \bar{b}

couplings implied by the LEP precision electroweak measurements seems to be resolved by the current 13 TeV LHC

Z h

data, which is, however, dominated by the two data points with high transverse momentum of

Z

boson whose central values are in conflict with the standard model prediction. We also show the potential of the HL-LHC to either verify or exclude the anomalous

Z b \bar{b}

couplings observed at LEP through measuring the

Z h

production rate at the HL-LHC, and this conclusion is not sensitive to the possible new physics contribution induced by top quark or Higgs boson anomalous couplings in the loop.

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