Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-05-08
JHEP 0208:016,2002
Physics
High Energy Physics
High Energy Physics - Phenomenology
46 pages, LaTeX, JHEP.cls, 21 Figures. minor corrections
Scientific paper
10.1088/1126-6708/2002/08/016
Generic D-brane string models of particle physics predict the existence of extra U(1) gauge symmetries beyond hypercharge. These symmetries are not of the E_6 class but rather include the gauging of Baryon and Lepton numbers as well as certain Peccei-Quinn-like symmetries. Some of the U(1)'s have triangle anomalies, but they are cancelled by a Green-Schwarz mechanism. The corresponding gauge bosons typically acquire a mass of order the string scale M_S by combining with two-index antisymmetric fields coming from the closed string sector of the theory. We argue that in string models with a low string scale M_S proportional to 1-10 TeV, the presence of these generic U(1)'s may be amenable to experimental test. Present constraints from electroweak precision data already set important bounds on the mass of these extra gauge bosons. In particular, for large classes of models, rho-parameter constraints imply M_S >= 1.5 TeV. In the present scheme some fraction of the experimentally measured Z^0 mass would be due not to the Higgs mechanism, but rather to the mixing with these closed string fields. We give explicit formulae for recently constructed classes of intersecting D6- and D5-brane models yielding the Standard Model (SM) fermion spectrum.
Ghilencea Dumitru M.
Ibanez Luis E.
Irges Nikolaos
Quevedo Fernando
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