Isospin breaking in K ->pi pi decays
NAGIOS: RODERIC FUNCIONANDO

Isospin breaking in K ->pi pi decays

DSpace Repository

Isospin breaking in K ->pi pi decays

Show simple item record

dc.contributor.author Cirigliano, Vincenzo
dc.contributor.author Ecker, Gerhard
dc.contributor.author Neufeld, Helmut
dc.contributor.author Pich Zardoya, Antonio
dc.date.accessioned 2015-02-27T08:51:52Z
dc.date.available 2015-02-27T08:51:52Z
dc.date.issued 2004
dc.identifier.uri http://hdl.handle.net/10550/42487
dc.description.abstract We perform a complete analysis of isospin breaking in K --> 2pi amplitudes in chiral perturbation theory, including both strong isospin violation (m(u) not equal m(d)) and electromagnetic corrections to next-to-leading order in the low-energy expansion. The unknown chiral couplings are estimated at leading order in the 1/N-c expansion. We study the impact of isospin breaking on CP conserving amplitudes and rescattering phases. In particular, we extract the effective couplings g8 and g27 from a fit to K --> pipi branching ratios, finding small deviations from the isospin-limit case. The ratio Re A(0)/ Re A(2) measuring the DeltaI = 1/2 enhancement is found to decrease from 22.2 +/- 0.1 in the isospin limit to 20.3 +/- 0.5 in the presence of isospin breaking. We also analyze the effect of isospin violation on the CP violation parameter epsilon', finding a destructive interference between three different sources of isospin violation. Within the uncertainties of large-N-c estimates for the low-energy constants, the isospin violating correction for epsilon' is below 15%.
dc.language.iso eng
dc.relation.ispartof European Physical Journal C, 2004, vol. 33, num. 3, p. 369-396
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Cirigliano, Vincenzo Ecker, Gerhard Neufeld, Helmut Pich Zardoya, Antonio 2004 Isospin breaking in K ->pi pi decays European Physical Journal C 33 3 369 396
dc.subject Física
dc.title Isospin breaking in K ->pi pi decays
dc.type info:eu-repo/semantics/article
dc.date.updated 2015-02-27T08:51:52Z
dc.identifier.doi http://dx.doi.org/10.1140/epjc/s2003-01579-3
dc.identifier.idgrec 016634

View       (538.2Kb)

This item appears in the following Collection(s)

Show simple item record

Search DSpace

Advanced Search

Browse

Statistics