New Dipole Penguin Contribution to K --> pi pi decays

Abstract

We point out that the standard chromomagnetic penguin dipole operator has a counterpart corresponding to off-shell momenta for external quarks. By employing the chiral quark model, we show that this new dipole penguin operator has the same bosonisation as the standard Q_6 operator. Accordingly, this new operator enlarges by ~ 5 % the referent Q_6 contribution, which gives the dominant contribution to the CP-violating ratio epsilon'/epsilon and also gives an important contribution to the Delta I = 1/2 amplitude.

17 pages, 1 PS figure, LaTeX, corresponds to published version

References in corpus (22)

• Weak Decays Beyond Leading Logarithms
• The $\Delta S=1$ Effective Hamiltonian Including Next-to-Leading Order QCD and QED Corrections
• Observation of Direct CP Violation in K_{S,L} to ππDecays
• A new measurement of direct CP violation in two pion decays of the neutral kaon
• A precision measurement of direct CP violation in the decay of neutral kaons into two pions
• Precise Measurements of Direct CP Violation, CPT Symmetry, and Other Parameters in the Neutral Kaon System
• Measurements of Direct CP Violation, CPT Symmetry, and Other Parameters in the Neutral Kaon System
• Maximum Wavelength of Confined Quarks and Gluons and Properties of Quantum Chromodynamics
• A precise measurement of the direct CP violation parameter Re(epsilon'/epsilon)
• Estimating epsilon'/epsilon. A Review
• ${\epsilon }^{\prime }/\epsilon$ at $O(p^4)$ in the Chiral Expansion
• Isospin Breaking in K -> Pi Pi Decays
• Studying ${\epsilon }^{\prime }/\epsilon$ in the Chiral Quark Model: ${\gamma }_5$-Scheme Independence and NLO Hadronic Matrix Elements
• epsilon'/epsilon in the Chiral Limit
• Chiral Condensates, Q_7 and Q_8 Matrix Elements and Large-N_c QCD
• The Relevance of the Dipole Penguin Operators in ${\epsilon }^{\prime }/\epsilon$
• Dimension-eight Operators in the Weak OPE
• A Heavy-Light Chiral Quark Model
• New contribution to anomalous radiative $K^0$-decays
• The self-penguin contribution to $K\to 2\pi$
• On the dispersive two-photon K_L -> μ^+ μ^- amplitude
• Quark off-shell contributions to $K_L\to \gamma \gamma$ in a bound-state approach

Cited by in corpus (3)

• New physics in ε' from chromomagnetic contributions and limits on Left-Right symmetry
• Probing New Physics in Charm Couplings with FCNC
• Non-factorizable contribtion to $\overline{B_d^0}\to {\pi }^0{D}^0$