Contributions of axion-like particles to lepton dipole moments
| Autor: | Marciano, W. J., Masiero, A., Paradisi, P., Passera, M. |
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| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Phys. Rev. D 94, 115033 (2016) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevD.94.115033 |
| Popis: | Contributions of a spin 0 axion-like particle (ALP) to lepton dipole moments, g-2 and EDMs, are examined. Barr-Zee and light-by-light loop effects from a light pseudoscalar ALP are found to be capable of resolving the long-standing muon g-2 discrepancy at the expense of relatively large ALP-gammagamma couplings. The compatibility of such large couplings with direct experimental constraints and perturbative unitarity bounds is discussed. Future tests of such a scenario are described. For CP violating ALP couplings, the electron EDM is found to probe much smaller, theoretically more easily accommodated ALP interactions. Future planned improvement in electron EDM searches is advocated as a way to not only significantly constrain ALP parameters but also, to potentially unveil a new source of CP violation which could have far reaching ramifications. Comment: 5 pages, 4 figures. V2: Title shortened and several references added. More emphasis on contributions of Barr-Zee diagrams, along with an extended discussion of the allowed parameter space of ALP solutions to the muon g-2 discrepancy incorporated. V3: Minor text improvments. Published version |
| Databáze: | arXiv |
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