2020/04/08 by Goran Senjanović, Goran Senjanovic, Senjanovic, Goran +2 · 1 citation
Engineering · Physics and Astronomy · #Axion #Blessing #CP violation #Context (archaeology) #Dark matter #FOS: Physical sciences #Geometry #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Lepton #Lepton number #Neutrino #Neutrino Physics Research #Nuclear physics #Parameter space #Parity (physics) #Particle Accelerators and Free-Electron Lasers #Particle physics #Particle physics theoretical and experimental studies #Philosophy #Physics #Physics beyond the Standard Model #Strong CP problem #Theoretical physics #Yukawa potential #hep-ex #hep-ph
paper · pdf · doi:10.48550/arxiv.2004.04036
some clarifications made, references added, 9 pages, 1 figure
openalex publication_date 2020/04/08 · arxiv created 2020/06/11 · arxiv updated 2020/06/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We readdress the issue of strong CP violation both in the Standard Model and in the Minimal Left-Right Symmetric Model and try to clear the confusion that seems to still pervade the field. We argue that the smallness of strong CP violation, while harmless and basically decoupled from the rest of physics in the SM, in the context of LR symmetry provides a blessing by helping to narrow down the parameter space of the theory and connecting apparently uncorrelated physical quantities. In particular, in the context of left-right symmetry being parity, it either points to the suppression of leptonic CP violation noticed before, or it leads to relatively light right-handed neutrinos, potentially accessible at the next hadron collider. The latter, more natural in view of complex quark Yukawa couplings, goes hand in hand with the smallness of lepton flavor violation and enhances the possibility of observing neutrinoless double beta decay.