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Malaphoric $Z'$ models for $b \rightarrow s \ell^+ \ell^-$ anomalies
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abstract
We study some phenomenological effects of kinetic mixing between the hypercharge field and a new $U(1)$ gauge field in specific $Z^\prime$ models that ameliorate the tensions between measurements and Standard Model predictions in $b \rightarrow s\ell^+ \ell^-$ decays. To this end, we rederive the dimension-6 SMEFT coefficients resulting from integrating out the kinetically-mixed (`malaphoric') $Z^\prime$ field. The kinetic mixing provides a family-universal component to the couplings of the $Z^\prime$ field, which can improve fits to lepton flavour universality observables. We show how kinetic mixing improves the best fit of the $B_3-L_2$ model to $b\rightarrow s$ data by 7.0 units of $\chi^2$ while remaining compatible with other relevant data sets such as electroweak precision observables and measurements of $e^+ e^- \rightarrow \ell^+ \ell^-$ at LEP2.
Forward citations
Cited by 3 Pith papers
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On the Robustness of type-II Seesaw Collider Searches
Adding a single effective operator that makes the doubly charged Higgs decay into two leptons and a photon weakens current ATLAS limits from ~1.1 TeV to ~0.7 TeV, but requiring a hard photon in the final state restore...
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Constraints on the malaphoric $B_3-L_2$ model from di-lepton resonance searches at the LHC
New bounds from ATLAS 13 TeV di-lepton searches force the malaphoric B3-L2 Z' to exceed 2.8 TeV to preserve its b to s l+ l- fit, and the HL-LHC is expected to reach 4.2 TeV.
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The Plan B Model: $Z^{\prime}$ collider phenomenology and discovery prospects
Current LHC data exclude a significant portion of the Plan B Model's preferred parameter space, and the HL-LHC could extend sensitivity to Z′ masses around 2.5 TeV.
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