Johan Bijnens
Professor, Deputy Head of Division
Obtaining K → ππ from off-shell K → π amplitudes
Author
Summary, in English
We properly define off-shell K → π transition amplitudes and use them to extract information for on-shell K → ππ amplitudes within Chiral Perturbation Theory. At order p2 in the chiral expansion all three parameters of weak interaction can be determined. At order p4 we are able to fix eleven additional constants out of thirteen contributing to off-shell K → π transitions, which leaves four undetermined constants in the on-shell K → ππ amplitudes. All script O sign(p4) contributions have been exactly derived with m2 π ≠ 0. We finally discuss the weak mass term issue and find contributions to on-shell ΔS = ±1 kaon decays, in particular to transitions like KL → γγ, KL → μ+μ- and KS → π0γγ at the lowest non-zero order.
Department/s
- Department of Astronomy and Theoretical Physics - Has been reorganised
Publishing year
1998-06-15
Language
English
Pages
305-333
Publication/Series
Nuclear Physics B
Volume
521
Issue
1-2
Document type
Journal article
Publisher
North-Holland
Topic
- Subatomic Physics
Keywords
- Chiral perturbation theory
- Non-leptonic kaon decays
Status
Published
ISBN/ISSN/Other
- ISSN: 0550-3213