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• W1982904357 abstract "There are two $Z$-peak observables related to the pair production of bottom quarks that show a deviation of about $2.5ensuremath{sigma}$ each from Standard Model expectations. While the discrepancy in the forward-backward asymmetry is a long-standing one, the tension for the second observable, namely the ratio of the partial width for a $Z$ decaying to a pair of bottom quarks to the total hadronic decay width of the $Z$, has recently gone up due to a full two-loop evaluation of the Standard Model contributions. We show how both these discrepancies may be explained in the framework of new physics that couples only to the third generation of quarks. In the paradigm of effective operators, the Wilson coefficients of some of the possible operators are already very tightly constrained by flavor physics data. However, there still remain certain operators, particularly those involving right-chiral quark fields, which can successfully explain the anomalies. We also show how the footprints of such operators may be observed at the upgraded LHC." @default.
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• W1982904357 date "2014-01-06" @default.
• W1982904357 modified "2023-10-12" @default.
• W1982904357 title "Z-pole observables in an effective theory" @default.
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• W1982904357 doi "https://doi.org/10.1103/physrevd.89.013002" @default.
• W1982904357 hasPublicationYear "2014" @default.
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