Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2004-06-04
Nucl.Phys. B699 (2004) 253
Physics
High Energy Physics
High Energy Physics - Phenomenology
47 pages, 3 figures
Scientific paper
10.1016/j.nuclphysb.2004.08.024
We discuss various aspects of the early petite unification (PUT) of quarks and leptons based on the gauge group G_PUT=SU(4)_PS x SU(2)_L x SU(2)_R x SU(2)_H. This unification takes place at the scale M= O(1-2 TeV) and gives the correct value of sin^2 theta_W(M_Z^2) without the violation of the upper bound on the K_L -> mu e rate and the limits on FCNC processes. These properties require the existence of three new generations of unconventional quarks and leptons with charges up to 4/3 (for quarks) and 2 (for leptons) and masses O(250 GeV) in addition to the standard three generations of quarks and leptons. The horizontal group SU(2)_H connects the standard fermions with the unconventional ones. We work out the spontaneous symmetry breaking (SSB) of the gauge group G_PUT down to the SM gauge group, generalize the existing one-loop renormalization group (RG) analysis to the two-loop level including the contributions of Higgs scalars and Yukawa couplings, and demonstrate that the presence of three new generations of heavy unconventional quarks and leptons with masses O(250 GeV) is consistent with astrophysical constraints. The NLO and Higgs contributions to the RG analysis are significant while the Yukawa contributions can be neglected.
Buras Andrzej J.
Hung Pham Quang
Poschenrieder Anton
Tran Ngoc-Khanh
Wyszomirski Elmar
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