Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-03-18
Phys.Lett.B675:59,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, latex, no figures. Re-referenced certain papers; added a paragraph and table regarding ACP(pi0 K0). Conclusions unch
Scientific paper
The measurements of B -> pi K decays have been in disagreement with the predictions of the Standard Model (SM) for some time. In this paper, we perform an update of this puzzle using the latest (2008) data. We find that the situation has become far less clear. A fit to the B -> pi K data alone suggests the presence of new physics (NP). Indeed, if one adds a constraint on the weak phase gamma coming from independent measurements -- the SM fit -- one finds that the fit is poor. On the other hand, it is not terrible. If one is willing to accept some deficiencies in the fit, it can be argued that the SM can explain the B -> pi K data. If one assumes NP, it is found to be present only in the electroweak penguin amplitude, as before. However, the fit is fair at best, and the improvement over the SM is not particularly strong. All and all, while the B -> pi K puzzle has not disappeared, it has become weaker.
Baek Seungwon
Chiang Cheng-Wei
London David
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