U-Spin Tests of the Standard Model and New Physics

Details U-Spin Tests of the Standard Model and New Physics U-Spin Tests of the Standard Model and New Physics

2007-01-24

arxiv.org/abs/hep-ph/0701199v4

Mod.Phys.Lett.A23:1175-1185,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, latex, no figures. References changed to follow MPL guidelines; info added about U-spin breaking and small NP strong

Scientific paper

10.1142/S0217732308027023

Within the standard model, a relation involving branching ratios and direct CP asymmetries holds for the B-decay pairs that are related by U-spin. The violation of this relation indicates new physics (NP). In this paper, we assume that the NP affects only the Delta S = 1 decays, and show that the NP operators are generally the same as those appearing in B -> pi K decays. The fit to the latest B -> pi K data shows that only one NP operator is sizeable. As a consequence, the relation is expected to be violated for only one decay pair: Bd -> K0 pi0 and Bs -> Kbar0 pi0.

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