A low-energy perspective on the minimal left-right symmetric model
Jul 22, 2021
69 pages
Published in:
- JHEP 11 (2021) 127
- Published: Nov 17, 2021
e-Print:
- 2107.10852 [hep-ph]
Report number:
- LA-UR-21-26789
View in:
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Abstract: (Springer)
We perform a global analysis of the low-energy phenomenology of the minimal left-right symmetric model (mLRSM) with parity symmetry. We match the mLRSM to the Standard Model Effective Field Theory Lagrangian at the left-right-symmetry breaking scale and perform a comprehensive fit to low-energy data including mesonic, neutron, and nuclear β-decay processes, ∆F = 1 and ∆F = 2 CP-even and -odd processes in the bottom and strange sectors, and electric dipole moments (EDMs) of nucleons, nuclei, and atoms. We fit the Cabibbo-Kobayashi-Maskawa and mLRSM parameters simultaneously and determine a lower bound on the mass of the right-handed W boson. In models where a Peccei-Quinn mechanism provides a solution to the strong CP problem, we obtain ≳ 5.5 TeV at 95% C.L. which can be significantly improved with next-generation EDM experiments. In the P-symmetric mLRSM without a Peccei-Quinn mechanism we obtain a more stringent constraint ≳ 17 TeV at 95% C.L., which is difficult to improve with low-energy measurements alone. In all cases, the additional scalar fields of the mLRSM are required to be a few times heavier than the right-handed gauge bosons. We consider a recent discrepancy in tests of first-row unitarity of the CKM matrix. We find that, while TeV-scale W bosons can alleviate some of the tension found in the V determinations, a solution to the discrepancy is disfavored when taking into account other low-energy observables within the mLRSM.Note:
- 42 pages plus appendices. Published version
- Beyond Standard Model
- CP violation
- Effective Field Theories
- new physics
- model: left-right
- model: minimal
- symmetry: left-right
- effective Lagrangian
- effective field theory
- flavor: violation
References(216)
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