Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-08-24
Phys.Rev.D62:015014,2000
Physics
High Energy Physics
High Energy Physics - Phenomenology
31 pages, latex, no figures. Globally revised version with new exposition of results presented (to appear in Phys. Rev. D)
Scientific paper
10.1103/PhysRevD.62.015014
A minimal lepton number violation (LNV) is proposed which could naturally appear in SUSY theories, if Yukawa and LNV couplings had a common origin. According to this idea properly implemented into MSSM with an additional abelian flavor symmetry the prototype LNV appears due to a mixing of leptons with superheavy Higgs doublet mediating Yukawa couplings. As a result, all significant physical manifestations of LNV reduce to those of the effective trilinear couplings $LL\bar{E}$ and $LQ\bar{D}$ aligned, by size and orientation in a flavor space, with the down fermion (charged lepton and down quark) effective Yukawa couplings, while the effective bilinear terms appear generically suppressed relative to an ordinary $\mu $-term of MSSM. Detailed phenomenology of the model related to the flavor-changing processes both in quark and lepton sectors, radiatively induced neutrino masses and decays of the LSP is presented. Remarkably, the model can straightforwardly be extended to a Grand Unified framework and an explicit example with SU(7) GUT is thoroughly discussed.
Chkareuli J. L.
Gogoladze I. G.
Green M. G.
Hutchcroft David E.
Kobakhidze Archil B.
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