HINTS FOR NEW PHYSICS IN B-CP ASYMMETRIES: MAY BE WE ARE EIGHT NOW?
Presented by Amarjit SONI on 27 Jul 2009 from 15:30 to 15:50
Session: CP-violation I
“ B-CP anomalies, “4th” generation and the LHC Abstract Although the CKM-paradigm works approximately to O(20%), there are by now several indications that suggest the need for beyond the Standard Model CP-odd phase(s). The value of sin 2β measured via the goldplated (tree) mode, B → ψK s is smaller than the value deduced by using improved lattice matrix elements. The value of sin 2β measured via ‘penguin-dominated’ (loop) decays tends to be even smaller still. There is also a rather large difference between the direct CP asymmetries in → K − π + and B − → K − π 0 that is rather difficult to understand. Also recently, CDF and D0 are finding about a signal of CP asymmetry B s → ψϕ. If true, this would be consistent with the indications of new CP-phase in penguin b → s transitions seen at B-factories. We emphasize that the data are quite suggestive of a fourth family with m_ t' in the range of 400–600 GeV as perhaps the simplest BSM candidate which ‘naturally’ explains the data. This picture leads to significant repercussions for the LHC which will be explored.