Ansatz for small FCNC with a non-universal $Z^\prime$

Details Ansatz for small FCNC with a non-universal $Z^\prime$ Ansatz for small FCNC with a non-universal $Z^\prime$

2009-07-23

arxiv.org/abs/0907.4034v2

Phys.Lett.B680:72-75,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages. Several typos corrected. Version accepted by Phys. Lett. B

Scientific paper

10.1016/j.physletb.2009.08.033

It is well known that a non-universal $Z^\prime$ 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 $V_{ts}$.

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