European Physical Journal C: Particles and Fields (Aug 2021)

Global fits of third family hypercharge models to neutral current B-anomalies and electroweak precision observables

  • B. C. Allanach,
  • J. Eliel Camargo-Molina,
  • Joe Davighi

DOI
https://doi.org/10.1140/epjc/s10052-021-09377-1
Journal volume & issue
Vol. 81, no. 8
pp. 1 – 15

Abstract

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Abstract While it is known that third family hypercharge models can explain the neutral current B-anomalies, it was hitherto unclear whether the $$Z-Z^\prime $$ Z - Z ′ mixing predicted by such models could simultaneously fit electroweak precision observables. Here, we perform global fits of several third family hypercharge models to a combination of electroweak data and those data pertinent to the neutral current B-anomalies. While the Standard Model is in tension with this combined data set with a p-value of .0007, simple versions of the models (fitting two additional parameters each) provide much improved fits. The original Third Family Hypercharge Model, for example, has a p-value of $${.065}$$ . 065 , with $$\sqrt{\Delta \chi ^2}=6.5\sigma $$ Δ χ 2 = 6.5 σ .