ar X iv : h ep - p h / 96 05 35 9 v 3 1 4 O ct 1 99 6 Leptophobic Z ′ in stringy flipped SU ( 5 )
نویسنده
چکیده
We show that leptophobic Z ′ gauge bosons occur naturally in flipped SU(5) and may shiftRb 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.
منابع مشابه
ar X iv : h ep - p h / 96 07 23 1 v 1 3 J ul 1 99 6 1 String Unification and Leptophobic Z ′ in Flipped SU ( 5 ) Jorge
Flipped SU(5) enthusiasts keep discovering hidden treasures, even after 10 years from its birth [1]. As is well known, the model attains its highest relevance in strings: efforts by several groups using different approaches have not (yet?) yielded appealing “string GUTs” [SO(10)]. Among levelone Kac-Moody models, only flipped SU(5) unifies SU(3) and SU(2), providing an explanation for the “LEP ...
متن کاملar X iv : h ep - p h / 06 07 11 3 v 3 2 2 A ug 2 00 6 B 0 s − B 0 s Mixing in Leptophobic Z ′ Model
Abstract Leptophobic Z ′ gauge boson appears naturally in many grand unified theories, such as flipped SU(5) or string-inspired E6 models. This elusive particle easily escapes the direct/indirect detections because it does not couple to charged leptons. However, it can generate flavor changing neutral current at tree level. In this letter, we show that the recently measured mass difference, ∆ms...
متن کاملar X iv : h ep - t h / 94 10 05 5 v 1 9 O ct 1 99 4 RESOLUTION OF DIAGONALS AND MODULI SPACES
متن کامل