Small violations of unitarity, the phase in B-s(0) - (B)over-bar(s)(0) and visible t -> cZ decays at the LHC

The authors acknowledge J. Portole´s for useful conversations. This research has been supported by European FEDER, Spanish MEC under Grant No. FPA 2005- 01678, No. PORT2007-03, No. PORT2008-03, and No. SAB2006-0044, as well as by Fundac¸a˜o para a Cieˆncia e a Tecnologia (FCT, Portugal) through the Project No. PDCT/FP/63912/2005, No. PDCT/FP/63914/ 2005, No. POCI/FP/81919/2007, and No. CFTP-FCT UNIT 777 which are partially funded through POCTI (FEDER), and by the Marie Curie RTN No. MRTN-CT- 2006-035505.