Flavor-Changing and Left-Right Asymmetric Phenomenology of $Z^{‘}$ Boson in an Anomaly-Free U(1)$’$ Gauge Family Model. (arXiv:1108.5012v1 [hep-ph])

We study a simple ultraviolet complete and anomaly free $ Z’$ model based on a
U$ (1)’$ gauge family symmetry without introducing extra fermions beyond the
standard model. The U$ (1)’$ group is diagonal in the three family space in
which the U(1)$ ‘$ charges of the first and second families are the same but
different from those of the third family. After spontaneous symmetry breaking
and rotating to the mass eigenstates of quarks and leptons, there exist in
general both flavor-changing and left-right asymmetric processes via the $ Z’$
boson exchanging interactions, which can lead to the flavor-changing neutral
currents and the forward-backward asymmetry in the top quark pair production.
Based on such a $ Z’$ model, we present a general analysis on the
forward-backward asymmetry in the top quark pair production by considering the
recently reported experimental results, and find that there exists a parameter
space which can lead to the desired asymmetry for explaining the CDF experiment
results.

hep-ex updates on arXiv.org