Charming Penguins Strike Back
نویسندگان
چکیده
By using the recent experimental measurements of B → ππ and B → Kπ branching ratios, we find that factorization is unable to reproduce the observed BRs even taking into account the uncertainties of the input parameters. Charming and GIM penguins allow to reconcile the theoretical predictions with the data. Because of these large effects, we conclude, however, that it is not possible, with the present theoretical and experimental accuracy, to determine the CP violation angle γ from these decays. Contrary to factorization, we predict large asymmetries for several of the particle–antiparticle BRs, in particular BR(B+ → K+π0), BR(Bd → K+π−) and BR(Bd → π+π−). This opens new perspectives for the study of CP violation in B systems.
منابع مشابه
Soft - Collinear - Effective - Theory
We analyze the charmless two-body B → V P decays in the soft-collinear-effective-theory (SCET), where V (P ) denotes a light vector (pseudoscalar) meson. Using the current experimental data, we find two solutions in χ fit for the 16 non-perturbative inputs responsible for the 87 B → PP and B → V P decay channels in SU(3) symmetry. Chirally enhanced penguins can only change several charming peng...
متن کاملCharming-penguin Enhanced B Decays
Long-distance contributions of operators of the effective non-leptonic weak Hamiltonian containing charmed currents have been recently studied. Penguin-like contractions of these operators, denoted as charming penguins, have been shown to be relevant for several B decays into two pseudoscalar mesons. In particular, they are expected to give large enhancements to processes which would be otherwi...
متن کاملInfluence of Charming Penguins on the Extraction of Γ in B → Pp Decays
Charmless B → PP decays are studied using flavor SU(3) symmetry. Amplitude with charming penguin topology is considered for two cases: with zero and with arbitrary strong phase. Two sets of data (an older and the most recent one) are used in the fits, so that the stability of the fits is tested. It is shown that within the present uncertainties in the data the parameters of the fit may be signi...
متن کاملFactorization fits and the unitarity triangle in charmless two-body B decays
We present fits to charmless hadronic B decay data from the BaBar, Belle and Cleo experiments using two theoretical models: (i) the QCD factorization model of Beneke et al. and (ii) QCD factorization complemented with the so-called charming penguins of Ciuchini et al. When we include the data from pseudoscalar-vector decays the results favor the incorporation of the charming penguin terms. We a...
متن کاملar X iv : h ep - p h / 01 08 12 1 v 1 1 5 A ug 2 00 1 SLAC – PUB – 8961 UK / TP 01 – 05 August 2001 Evading the CKM Hierarchy
We show that the presence of intrinsic charm in the hadrons’ light-cone wave functions, even at a few percent level, provides new, competitive decay mechanisms for B decays which are nominally CKM-suppressed. For example, the weak decays of the B-meson to two-body exclusive states consisting of strange plus light hadrons, such as B → πK, are expected to be dominated by penguin contributions sin...
متن کامل