Fermiophobic Z′ model for simultaneously explaining the muon anomalies RK(*) and (g−2)μ
Fermiophobic Z′ model for simultaneously explaining the muon anomalies RK(*) and (g−2)μ
We discuss a simple renormalizable, gauge invariant model with a fermiophobic
Z′ boson: it has no couplings to the three Standard Model (SM) chiral families, but does couple to a fourth vectorlike (VL) family. The SM Higgs couples to the fourth VL lepton, leading to an enhanced contribution to the muon anomalous magnetic moment (g−2)μ. The latter contribution requires a nonvanishing coupling of Z′
to right-handed muons, which arises within this model due to mixing effects between the SM and VL fermions, along with Z′ couplings to the second generation SM lepton doublet and third generation SM quark doublet. This model can simultaneously account for the measured B-decay ratios RK(*) and (g−2)μ. We identify the parameter space where this explanation is consistent with existing experimental constraints coming from Bs−¯B8 mixing, neutrino trident production and collider searches. We also check that the SM Higgs coupling to the fourth VL lepton does not produce a dangerous contribution to the Higgs diphoton decay.
Fernández Navarro, Mario
0272bcb5-5fe2-40ec-a2f0-b4363a9f065b
King, Stephen F.
f8c616b7-0336-4046-a943-700af83a1538
14 February 2022
Fernández Navarro, Mario
0272bcb5-5fe2-40ec-a2f0-b4363a9f065b
King, Stephen F.
f8c616b7-0336-4046-a943-700af83a1538
Fernández Navarro, Mario and King, Stephen F.
(2022)
Fermiophobic Z′ model for simultaneously explaining the muon anomalies RK(*) and (g−2)μ.
Physical Review D, 105 (3), [035015].
(doi:10.1103/PhysRevD.105.035015).
Abstract
We discuss a simple renormalizable, gauge invariant model with a fermiophobic
Z′ boson: it has no couplings to the three Standard Model (SM) chiral families, but does couple to a fourth vectorlike (VL) family. The SM Higgs couples to the fourth VL lepton, leading to an enhanced contribution to the muon anomalous magnetic moment (g−2)μ. The latter contribution requires a nonvanishing coupling of Z′
to right-handed muons, which arises within this model due to mixing effects between the SM and VL fermions, along with Z′ couplings to the second generation SM lepton doublet and third generation SM quark doublet. This model can simultaneously account for the measured B-decay ratios RK(*) and (g−2)μ. We identify the parameter space where this explanation is consistent with existing experimental constraints coming from Bs−¯B8 mixing, neutrino trident production and collider searches. We also check that the SM Higgs coupling to the fourth VL lepton does not produce a dangerous contribution to the Higgs diphoton decay.
Text
PhysRevD.105.035015
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Accepted/In Press date: 21 January 2022
Published date: 14 February 2022
Identifiers
Local EPrints ID: 488688
URI: http://eprints.soton.ac.uk/id/eprint/488688
ISSN: 2470-0010
PURE UUID: 0dd67e22-d14b-41c7-8392-6a3d5309cc69
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Date deposited: 04 Apr 2024 16:42
Last modified: 10 Apr 2024 02:05
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Author:
Mario Fernández Navarro
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