Charming penguin and direct CP-violation in charmless B decays

Abstract

In the study of two-body charmless B decays as a mean of looking for direct CP-violation and measuring the CKM mixing parameters in the Standard Model, the short-distance penguin contribution with its absorptive part generated by charm quark loop seems capable of producing sufficient $B\to K\pi$ decays rates, as obtained in factorization and QCD-improved factorization models. However there are also long-distance charming penguin contributions which could give rise to a strong phase due to the rescattering $D^{\ast }{D}_s^{\ast }\to K\pi$ etc. In this talk, I would like to discuss recent works on the charming penguin contribution as a different approach to the calculation of these contributions in two-body charmless B decays. We find that the charming penguin contribution is significant for $B\to K\pi$ decays and, together with the tree and penguin terms, produces large branching ratios in agreement with data, though the analysis is affected by large theoretical uncertainties. The absorptive part due to the charmed meson intermediate states is found to produce large CP asymmetries for $B\to K\pi ,\pi \pi$ decays.

arXiv commentTalk given at the QCD Euroconference 2002, Montpellier 2-9 July 2002, LaTex, 7 pages, Misprint in the Tables corrected

References in corpus (19)

• QCD Factorization for $B\to \pi \pi$ Decays: Strong Phases and CP Violation in the Heavy Quark Limit
• Experimental Tests of Factorization in Charmless Non-Leptonic Two-Body B Decays
• The $\Delta S=1$ Effective Hamiltonian Including Next-to-Leading Order QCD and QED Corrections
• The Two-Loop Anomalous Dimension Matrix for $\Delta S=1$ Weak Non-Leptonic Decays I: $\mathcal{O}({\alpha }_s^2)$
• Two--Loop Anomalous Dimension Matrix for $\Delta S=1$ Weak Non-Leptonic Decays II: $\mathcal{O}({\alpha }_e{\alpha }_s)$
• Scheme Independence of the Effective Hamiltonian for $b\to s\gamma$ and $b\to sg$ Decays
• Charming Penguins in B decays
• Constraining the CKM angle $\gamma$ and penguin contributions through combined $B\to \pi K$ branching ratios
• QCD Sum Rule Analysis of the Decays $B\to K{\ell }^{+}{\ell }^{-}$ and $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$
• Charming Penguins Strike Back
• Hadronic Penguin B Decays In The Standard And The Two-Higgs-Doublet Models
• CP Violation and Strong Phases from Penguins in ${\mathbf{B}}^{\pm }\to \mathbf{VV}$ Decays
• Measurement of Charge Asymmetries in Charmless Hadronic in B Meson Decays
• Analysis of the Decays B-> ππand πK with QCD Factorization in the Heavy Quark Limit
• Penguin contributions to rates and CP asymmetries in non-leptonic B-decays. Possible experimental procedures and estimates
• Electroweak Penguins, Final State Interaction Phases and CP Violatioin in $B\to K\pi$ Decays
• $B\to \pi \pi ,K\pi$ Decays in QCD Improved Factorization Approach
• Dependence of the Form Factors of $B\to \pi \ell \nu$ on the Heavy Quark Mass
• Test of factorisation in $B\to K\pi$ decays