TY - JOUR
T1 - The B → ππ, πK puzzles in the light of new data
T2 - Implications for the Standard Model new physics and rare decays
AU - Buras, Andrzej J.
AU - Fleischer, Robert
AU - Recksiegel, Stefan
AU - Schwab, Felix
PY - 2005/6
Y1 - 2005/6
N2 - Recently, we developed a strategy to analyze the B → ππ, πK data. We found that the B →ππ measurements can be accommodated in the Standard Model (SM) through large non-factorizable effects. On the other hand, our analysis of the ratios Rc and Rn of the CP-averaged branching ratios of the charged and neutral B → πK modes, respectively, suggested new physics (NP) in the electroweak penguin sector, which may have a powerful interplay with rare decays. In this paper, we confront our strategy with recent experimental developments, addressing also the direct CP violation in Bd → π∓K±, which is now an established effect, the relation to its counterpart in B ± → π0K±, and the first results for the direct CP asymmetry of Bd → π0π 0 that turn out to be in agreement with our prediction. We obtain hadronic B → ππ, πK parameters which are almost unchanged and arrive at an allowed region for the unitarity triangle in perfect accordance with the SM. The "B → πK puzzle" persists, and can still be explained through NP, as in our previous analysis. In fact, the recently observed shifts in the experimental values of Rc and Rn have been predicted in our framework on the basis of constraints from rare decays. Conversely, we obtain a moderate deviation of the ratio R of the CP-averaged Bd → π∓K± and B± → π±K rates from the current experimental value. However, using the emerging signals for B± → K±K modes, this effect can be attributed to certain hadronic effects, which have a minor impact on Rc and do not at all affect Rn. Our results for rare decays remain unchanged.
AB - Recently, we developed a strategy to analyze the B → ππ, πK data. We found that the B →ππ measurements can be accommodated in the Standard Model (SM) through large non-factorizable effects. On the other hand, our analysis of the ratios Rc and Rn of the CP-averaged branching ratios of the charged and neutral B → πK modes, respectively, suggested new physics (NP) in the electroweak penguin sector, which may have a powerful interplay with rare decays. In this paper, we confront our strategy with recent experimental developments, addressing also the direct CP violation in Bd → π∓K±, which is now an established effect, the relation to its counterpart in B ± → π0K±, and the first results for the direct CP asymmetry of Bd → π0π 0 that turn out to be in agreement with our prediction. We obtain hadronic B → ππ, πK parameters which are almost unchanged and arrive at an allowed region for the unitarity triangle in perfect accordance with the SM. The "B → πK puzzle" persists, and can still be explained through NP, as in our previous analysis. In fact, the recently observed shifts in the experimental values of Rc and Rn have been predicted in our framework on the basis of constraints from rare decays. Conversely, we obtain a moderate deviation of the ratio R of the CP-averaged Bd → π∓K± and B± → π±K rates from the current experimental value. However, using the emerging signals for B± → K±K modes, this effect can be attributed to certain hadronic effects, which have a minor impact on Rc and do not at all affect Rn. Our results for rare decays remain unchanged.
UR - http://www.scopus.com/inward/record.url?scp=20944449164&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:20944449164
SN - 0587-4254
VL - 36
SP - 2015
EP - 2049
JO - Acta Physica Polonica B
JF - Acta Physica Polonica B
IS - 6
ER -