Ansatz for small FCNC with a non-universal Z '

作者：He Xiao Gang^*; Valencia G

来源：Physics Letters B, 2009, 680(1): 72-75.

DOI：10.1016/j.physletb.2009.08.033

It is well known that a non-Liniversal Z' induces tree-level FCNC which are severely constrained by experiment, most notably meson mixing. We point out that there is a class of models, with a down-quark mass matrix of the Georgi-Jarlskog form, in which the FCNC in the down-type quark sector vanish or are strongly suppressed. The largest FCNC in these models would occur in the tc transition with a strength comparable to V(ts).

• 出版日期2009-9-14