U-spin tests of the standard model and new physics

作者：Nagashima Makiko^*; Szynkman Alejandro; London David

来源：Modern Physics Letters A, 2008, 23(16): 1175-1185.

DOI：10.1142/S0217732308027023

• charge conjugation
• decay of bottom mesons
• models beyond the standard model

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: B-d(0) K-0 pi(0) and B-s(0) (K) over bar (0)pi(0).

• 出版日期2008-5-30