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Photo of Johan Bijnens

Johan Bijnens

Professor

Photo of Johan Bijnens

A new global fit of the L(i)(r) at next-to-next-to-leading order in Chiral Perturbation Theory

Author

  • Johan Bijnens
  • Ilaria Jemos

Summary, in English

Abstract in Undetermined
new fit is done to obtain numerical values for the order p(4) low-energy-constants L(i)(r) in Chiral Perturbation Theory. This includes both new data and new calculated observables. We take into account masses, decay constants, K(l4), pi pi and pi K scattering lengths and slopes and the slope of the pion scalar formfactor. We compare in detail where the changes w.r.t. the 10 years old "fit 10" come from. We discuss several scenarios for estimating the order p(6) constants C(i)(r) and search for possible values of them that provide a good convergence for the ChPT series. We present two such sets. One big change is that the fits do not have the expected behaviour in the limit of large N(c) as well as before. (C) 2011 Elsevier B.V. All rights reserved.

Department/s

  • Theoretical Particle Physics

Publishing year

2012

Language

English

Pages

631-665

Publication/Series

Nuclear Physics, Section B

Volume

854

Issue

3

Document type

Journal article

Publisher

North-Holland

Topic

  • Subatomic Physics

Status

Published

ISBN/ISSN/Other

  • ISSN: 0550-3213