|Author||Giudice, G. F. ♦ Passera, M. ♦ Paradisi, P.|
|Source||CERN Document Server|
|Subject Domain (in DDC)||Natural sciences & mathematics ♦ Physics ♦ Modern physics ♦ Technology ♦ Engineering & allied operations ♦ Applied physics|
|Subject Keyword||Particle Physics - Phenomenology|
|Abstract||We argue that the anomalous magnetic moment of the electron (a_e) can be used to probe new physics. We show that the present bound on new-physics contributions to a_e is 8*10^-13, but the sensitivity can be improved by about an order of magnitude with new measurements of a_e and more refined determinations of alpha in atomic-physics experiments. Tests on new-physics effects in a_e can play a crucial role in the interpretation of the observed discrepancy in the anomalous magnetic moment of the muon (a_mu). In a large class of models, new contributions to magnetic moments scale with the square of lepton masses and thus the anomaly in a_mu suggests a new-physics effect in a_e of (0.7 +- 0.2)*10^-13. We also present examples of new-physics theories in which this scaling is violated and larger effects in a_e are expected. In such models the value of a_e is correlated with specific predictions for processes with violation of lepton number or lepton universality, and with the electric dipole moment of the electron.|
|Description||Presented at: JHEP 12 (2012) 113|
|Learning Resource Type||Article|
|Rights License||Preprint: © 2012-2018 CERN (License: CC-BY-3.0)|
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