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High Energy Physics - Phenomenology, hep-ph
Abstract:
The extension of the Standard Model by a spontaneously broken abelian gauge
group based on the L(mu)-L(tau) lepton number can resolve the longstanding
discrepancy between experimental and theoretical values for the magnetic moment
of the muon. It furthermore naturally generates mu-tau symmetric lepton mixing,
introduces neutrino non-standard interactions, and the associated gauge boson
Z' serves as a mediator to the right-handed neutrino sector. A detailed fit to
electroweak data is performed to identify the allowed values for the mass of Z'
and its mixing with the Standard Model Z. An economical new scalar sector is
constructed that spontaneously breaks the new symmetry and leads to
experimental consequences such as lepton flavor violation and collider
signatures. Furthermore we discuss the non-abelian extension to an SU(2)',
particularly the neutrino sector.
