Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-03-14
Phys.Rev. D71 (2005) 074019
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, one figure, to be published in Phys. Rev. D. One reference updated; small typos corrected; one last correction
Scientific paper
10.1103/PhysRevD.71.074019
The $b \to s$ penguin amplitude affects a number of $B$ meson decays to two pseudoscalar ($P$) mesons in which potential anomalies are being watched carefully, though none has yet reached a statistically compelling level. These include (a) a rate for $B^0 \to K^0 \pi^0$ which is slightly enhanced with respect to expectations; (b) a time-dependent CP asymmetry parameter $S$ for $B^0 \to K^0 \pi^0$ which is low in comparison with the expected value of $\sin 2 \beta \simeq 0.73$, and (c) a similar deviation in the parameter $S$ for $B^0 \to \eta' K_S$. These and related phenomena involving vector mesons in the final state are discussed in a unified way in and beyond the Standard Model. Future experiments which would conclusively indicate the presence of new physics are identified. Several of these involve decays of the strange $B$ meson $B_s$. In the Standard Model we note an approximate sum rule for CP rate differences in $B^0\to K^+\pi^-, B^+\to K^+\pi^0$ and $B^0\to K^0\pi^0$, predicting a negative sign for the latter asymmetry.
Gronau Michael
Rosner Jonathan L.
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