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Isospin breaking in K ->pi pi decays
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| 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.citation | 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.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.subject | Física | |
| dc.title | Isospin breaking in K ->pi pi decays | |
| dc.type | journal article | es_ES |
| dc.date.updated | 2015-02-27T08:51:52Z | |
| dc.identifier.doi | 10.1140/epjc/s2003-01579-3 | |
| dc.identifier.idgrec | 016634 | |
| dc.rights.accessRights | open access | es_ES |
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