Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-07-04
Phys.Rev. D54 (1996) 5734-5744
Physics
High Energy Physics
High Energy Physics - Phenomenology
TEX 21 pages, 13 uuencoded figures (updated references)
Scientific paper
10.1103/PhysRevD.54.5734
In this paper we explore the possibility of intermediate scale physics in the context of superstring models with {\it higher Kac-Moody levels}, by focusing on left-right and Pati-Salam symmetries. We find that the left-right scale may lie in the range $10^{10} - 10^{12}$ GeV which is favored by neutrino physics, while the Pati-Salam scale is at most two or three orders of magnitude below the unification scale $M_X$. We also show that the scale of $B-L$ breaking can be as low as 1 TeV or so, providing protection against too rapid proton decay in supersymmetry. Our results allow a natural value for the scale $M_X \sim 10^{18}$ GeV and the agreement with the experiment requires the value of $\sin^2 {\theta_w}$ at $M_X$ to be in general very different from the usually assumed $3/8$.
Benakli Karim
Senjanovi'{c} Goran
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