Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-05-16
Phys.Rev. D74 (2006) 075007
Physics
High Energy Physics
High Energy Physics - Phenomenology
27 pages, 7 figures. A short paragraph, a footnote and a reference added
Scientific paper
10.1103/PhysRevD.74.075007
We study D-brane inspired models with U(3) x U(2) x U(1)^N gauge symmetry in the context of split supersymmetry. We consider configurations with one, two and three (N=1,2,3) abelian branes and derive all hypercharge embeddings which imply a realistic particle content. Then, we analyze the implications of split supersymmetry on the magnitude of the string scale, the gauge coupling evolution, the third family fermion mass relations and the gaugino masses. We consider gauge coupling relations which may arise in parallel as well as intersecting brane scenarios and classify the various models according to their predictions for the magnitude of the string scale and the low energy implications. In the parallel brane scenario where the U(1) branes are superposed to U(2) or U(3) brane stacks, varying the split susy scale in a wide range, we find three distinct cases of models predicting a high, intermediate and low string scale, M_S ~ 10^{16} GeV, M_S ~ 10^7 GeV and M_S ~ 10^4 GeV respectively. We further find that in the intermediate string scale model the low energy ratio m_b / m_\tau is compatible with b-\tau Yukawa unification at the string scale. Furthermore, we perform a similar analysis for arbitrary abelian gauge coupling relations at M_S corresponding to possible intersecting brane models. We find cases which predict a string scale of the order M_S \ge 10^{14} GeV that accommodate a right-handed neutrino mass of the same order so that a see-saw type light left-handed neutrino component is obtained in the sub-eV range as required by experimental and cosmological data. Finally, a short discussion is devoted for the gaugino masses and the life-time of the gluino.
Gioutsos D. V.
Leontaris George K.
Psallidas A.
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