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Photo of Johan Bijnens

Johan Bijnens

Professor

Photo of Johan Bijnens

Obtaining K → ππ from off-shell K → π amplitudes

Author

  • Johan Bijnens
  • Elisabetta Pallante
  • Joaquim Prades

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 m2π ≠ 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

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