Single Top Production and Extra Dimensions

In extra dimension theories, where the gauge bosons of the standard model propagate in the bulk of the extra dimensions, there are Kaluza-Klein excitations of the standard model gauge bosons that can couple to the standard model fermions. In this paper we study the effects of the excited Kaluza-Klein modes of the $W$ on single top production at the Tevatron.Comment: 8 pages, one fig. Talk presented at MRST 2002, Perimeter Institute, Waterloo, Ontari

BsB_s Mixing and New Physics in hadronic b→sqˉqb \to s \bar{q} q transitions

We study the implication of the recent $\Delta m_s$ measurement on $b \to s \bar{q} q$ transitions. We show that it is possible, in the presence of a flavour symmetry, that the phase in $B_s$ mixing may be unobservable even with new CP odd phases in $b \to s$ transitions. These phases may then produce new CP odd effects in certain $b \to s \bar{q} q$ transitions like $B \to K \pi$ but not in others like $B_d \to \phi K_s$. Working in a two higgs doublet model of new physics we discuss the allowed NP contribution to $B \to K \pi$ and $B_d \to \phi K_s$ decays with the new $Delta m_s$ measurement.Comment: 19 pages, no figures, references added, text added, accepted for publicatio