New dipole penguin contribution to K→ππ decays
| Autor: | Ivica Picek, Jan O. Eeg, Krešimir Kumerički |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Quark
Bosonization K mesons Nuclear and High Energy Physics Particle physics High Energy Physics::Lattice electroweak transitions 01 natural sciences 0103 physical sciences chiral lagrangians Operator product expansion Electroweak transitions 010306 general physics quark models Physics 010308 nuclear & particles physics Operator (physics) High Energy Physics::Phenomenology Quark model CP violation NATURAL SCIENCES. Physics PRIRODNE ZNANOSTI. Fizika High Energy Physics - Phenomenology Dipole Amplitude Quantum electrodynamics Quark models Chiral Lagrangians High Energy Physics::Experiment |
| Zdroj: | Physics Letters B Volume 699 |
| ISSN: | 0370-2693 |
| DOI: | 10.1016/j.physletb.2008.09.039 |
| Popis: | 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. Comment: 17 pages, 1 PS figure, LaTeX, corresponds to published version |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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