Leptophilic U(1) Massive Vector Bosons from Large Extra Dimensions: Reexamination of Constraints from LEP Data
| Autor: | Anchordoqui, L., Antoniadis, I., Huang, X., Lüst, D., Rondeau, F., Taylor, T. |
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| Přispěvatelé: | Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2021 |
| Předmět: |
High Energy Physics - Theory
interpretation of experiments: CERN LHC Coll fermion: scattering coupling: gauge FOS: Physical sciences scale: string hypercharge vector boson: massive membrane model High Energy Physics - Phenomenology (hep-ph) lepton: coupling: high excited state lepton number gauge boson electroweak interaction muon: magnetic moment [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th] Z': model High Energy Physics::Phenomenology CERN LEP Stor symmetry: U(1) High Energy Physics - Phenomenology High Energy Physics - Theory (hep-th) [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] High Energy Physics::Experiment propagator Kaluza-Klein |
| Zdroj: | Physics Letters B |
| DOI: | 10.48550/arxiv.2110.01247 |
| Popis: | Very recently, we proposed an explanation of the discrepancy between the measured anomalous magnetic moment of the muon and the Standard Model (SM) prediction in which the dominant contribution to $(g-2)_\mu$ originates in Kaluza-Klein (KK) excitations (of the lepton gauge boson) which do not mix with quarks (to lowest order) and therefore can be quite light avoiding LHC constraints. In this addendum we reexamine the bounds on 4-fermion contact interactions from precise electroweak measurements and show that the constraints on KK masses and couplings are more severe than earlier thought. However, we demonstrate that our explanation remains plausible if a few KK modes are lighter than LEP energy, because if this were the case the contribution to the 4-fermion scattering from the internal propagator would be dominated by the energy and not by the mass. To accommodate the $(g-2)_\mu$ discrepancy we assume that the lepton number $L$ does not partake in the hypercharge and propagates in one extra dimension (transverse to the SM branes): for a mass of the lowest KK excitation of 60 GeV (lower than the LEP energy), the string scale is roughly 10 TeV while the $L$ gauge coupling is of order $\sim 10^{-1}$. Comment: 3 pages. Addendum to arXiv:2105.02630. Published version |
| Databáze: | OpenAIRE |
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