TY - JOUR
T1 - QCD factorization in B→πK , ππ decays and extraction of Wolfenstein parameters
AU - Beneke, M.
AU - Buchalla, G.
AU - Neubert, M.
AU - Sachrajda, C. T.
N1 - Funding Information:
We are grateful to A. Höcker and H. Lacker for helpful discussions and for providing us with a data file of their CKM fit results. We also thank G. Martinelli and L. Silvestrini for useful discussions. The research of M.N. is supported in part by the National Science Foundation. C.T.S. acknowledges partial support from PPARC through Grant No. GR/K55738.
PY - 2001/7/9
Y1 - 2001/7/9
N2 - In the heavy-quark limit, the hadronic matrix elements entering nonleptonic B-meson decays into two light mesons can be calculated from first principles including "nonfactorizable" strong-interaction corrections. The B→πK,ππ decay amplitudes are computed including electroweak penguin contributions, SU(3) violation in the light-cone distribution amplitudes, and an estimate of power corrections from chirally-enhanced terms and annihilation graphs. The results are then used to reduce the theoretical uncertainties in determinations of the weak phases γ and α. In that way, new constraints in the (ρ̄,η̄) plane are derived. Predictions for the B→πK,ππ branching ratios and CP asymmetries are also presented. A good global fit to the (in part preliminary) experimental data on the branching fractions is obtained without taking recourse to phenomenological models.
AB - In the heavy-quark limit, the hadronic matrix elements entering nonleptonic B-meson decays into two light mesons can be calculated from first principles including "nonfactorizable" strong-interaction corrections. The B→πK,ππ decay amplitudes are computed including electroweak penguin contributions, SU(3) violation in the light-cone distribution amplitudes, and an estimate of power corrections from chirally-enhanced terms and annihilation graphs. The results are then used to reduce the theoretical uncertainties in determinations of the weak phases γ and α. In that way, new constraints in the (ρ̄,η̄) plane are derived. Predictions for the B→πK,ππ branching ratios and CP asymmetries are also presented. A good global fit to the (in part preliminary) experimental data on the branching fractions is obtained without taking recourse to phenomenological models.
KW - 13.25.Hw
UR - http://www.scopus.com/inward/record.url?scp=0035833209&partnerID=8YFLogxK
U2 - 10.1016/S0550-3213(01)00251-6
DO - 10.1016/S0550-3213(01)00251-6
M3 - Article
AN - SCOPUS:0035833209
SN - 0550-3213
VL - 606
SP - 245
EP - 321
JO - Nuclear Physics, Section B
JF - Nuclear Physics, Section B
IS - 1-2
ER -