A D-brane inspired U(3)C × U(3)L × U(3)R model
نویسندگان
چکیده
Motivated by D-brane scenarios, we consider a non-supersymmetric model based on the gauge symmetry U (3) C ×U (3) L ×U (3) R which is equivalent to the SU (3) 3 " trinification " model supplemented by three U (1)s. Two U (1) combinations are anomalous while the third U (1) Z ′ is anomaly free and contributes to the hypercharge generator. This hypercharge embedding correspods to sin 2 θ W = 6 19 in the case of full gauge coupling unification. The U (3) 3 symmetry is broken down to the Standard Model by vev's of ¯ 3) representations as in the trinification model. The model predicts a natural quark-lepton hierarchy, since quark masses are obtained from tree-level couplings, while charged leptons receive masses from fourth order Yukawa terms, as a consequence of the extra abelian symmetries. Light Majorana neutrino masses are obtained through a seesaw type mechanism operative at the SU (3) R breaking scale of the order M R ≥ 10 9 GeV. –2–
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A U(3)C × U(3)L × U(3)R gauge symmetry from intersecting D-branes
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