Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/9122
Share/Impact:
Título : K -> 3π final state interactions at NLO in CHPT and Cabibbo's proposal to measure a(0)-a(2)
Autor : Gámiz, Elvira, Prades, Joaquim, Scimemi, Ignazio
Palabras clave : Chiral perturbation theory
π-π scattering
Isospin breaking
Virtual photons
[PACS] Decays of K mesons
[PACS] Chiral Lagrangians
[PACS] Meson-meson interactions
Fecha de publicación : 26-Jan-2007
Editor: Springer
Società Italiana di Fisica
Citación : European Physical Journal C 50(2): 405-422 (2007)
Citación : IFIC/05-67
Resumen: We present the analytical results for the K -> 3π final state interaction phases at next-to-leading order (NLO) in CHPT. We also study the recent proposal of Cabibbo to measure the ππ scattering lengths combination a(0)-a(2) from the cusp effect in the π(0)π(0) energy spectrum at threshold for K+ -> π(0)π(0)π(+) and K-L -> π(0)π(0)π(0), and we give the relevant formulas to describe it at NLO. We estimate the theoretical uncertainty of the a(0)-a(2) determination at NLO in our approach and obtain the result that it is not smaller than 5% if added quadratically and 7% if added linearly, for K+ -> π(0)π(0)π(+). One gets similar theoretical uncertainties if the neutral K-L -> π(0)π(0)π(0) decay data below threshold are used instead. For this decay, there are very large theoretical uncertainties above threshold due to cancellations, and data above threshold cannot be used to get the scattering lengths. We do not include isospin corrections apart from two-pion phase space factors which are physical. We compare our results for the cusp effect with those due to Cabibbo and Isidori.
Descripción : 18 pages, 7 figures.-- PACS nrs.: 13.25.Es; 12.39.Fe; 13.75.Lb.-- ISI Article Identifier: 000245431700012.-- ArXiv pre-print available at: http://arxiv.org/abs/hep-ph/0602023
Printed version published in Apr 2007.
Versión del editor: http://dx.doi.org/10.1140/epjc/s10052-006-0201-7
URI : http://hdl.handle.net/10261/9122
ISSN: 1434-6044 (Print)
1434-6052 (Online)
DOI: 10.1140/epjc/s10052-006-0201-7
Citación : European Physical Journal C 50(2): 405-422 (2007)
Appears in Collections:(IFIC) Artículos

Files in This Item:
File Description SizeFormat 
0602023v4.pdf391,15 kBAdobe PDFView/Open
Show full item record
 
CSIC SFX LinksSFX Query


Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.