| 日時: |
2004-11-15 11:00 - |
| 場所: |
研究本館２階２２０号室 |
| 会議名: |
Implications of the B to pi pi, pi K Puzzles for the Standard Model, New Physics and Rare Decays |
| 連絡先: |
丹後 |
| 講演者: |
Prof. R. Fleischer (CERN) |
| 講演言語: |
英語 |
| アブストラクト: |
The $B$-factory data for the $B\to\pi\pi,\pi K$ branching ratios exhibit puzzling patterns. Following a recently proposed strategy, we show that the $B\to\pi\pi$ hierarchy can be accommodated in the Standard Model through large non-factorizable effects. On the other hand, the ``$B\to\pi K$ puzzle'' may indicate new physics in the electroweak penguin sector. Should this actually be the case, we expect a strong interplay with rare decays, leading to deviations from the picture of the Standard Model in several decays, with the most spectacular effects in $K_{\rm L}\to \pi^0 \nu\bar\nu$ and $B_{s,d}\to\mu^+\mu^-$. We confront this strategy with the most recent experimental developments, addressing also the direct CP violation in $B_d\to\pi^\mp K^\pm$, which is now an established effect, and the first results for the direct CP asymmetry of $B_d\to\pi^0\pi^0$ that turn out to be in agreement with our predictions. Moreover, we arrive at an allowed region for the unitarity triangle in perfect accordance with the Standard Model. The ``$B\to\pi K$ puzzle'' persists with the new data, and can still be explained through new physics in the electroweak penguin sector. In fact, certain shifts of the $B\to\pi K$ observables were actually predicted on the basis of constraints from rare decays. Papers: A.J. Buras, R. Fleischer, S. Recksiegel and F. Schwab, Phys. Rev. Lett. 92 (2004) 101804 [hep-ph/0312259], Nucl. Phys. B 697 (2004) 133 [hep-ph/0402112], hep-ph/0410407. |
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