Leptophobic Z' in stringy flipped SU(5)
J. Lopez, D. Nanopoulos
Abstract
We show that leptophobic Z' gauge bosons occur naturally in flipped SU(5) and may shift Rb in an interesting way without upsetting the good values of Γhad and Rc. Within a string-derived version of the model, we study three possible scenarios and the constraints imposed on model building that would allow the new symmetry to remain unbroken down to low energies. Such Z' gauge boson has generation non-universal couplings to quarks that violate parity maximally in the up-quark sector, and may contribute significantly to spin asymmetries in polarized pp scattering experiments now being prepared for RHIC.
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