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Titolo:
New analysis of the Delta I=1/2 rule in kaon decays and the ((B)-over-cap)(K) parameter
Autore:
Hambye, T; Kohler, GO; Soldan, PH;
Indirizzi:
Ist Nazl Fis Nucl, Lab Nazl Frascati, I-00044 Frascati, Italy Ist Nazl FisNucl Frascati Italy I-00044 ascati, I-00044 Frascati, Italy Univ Dortmund, Inst Phys, D-44221 Dortmund, Germany Univ Dortmund Dortmund Germany D-44221 t Phys, D-44221 Dortmund, Germany
Titolo Testata:
EUROPEAN PHYSICAL JOURNAL C
fascicolo: 2, volume: 10, anno: 1999,
pagine: 271 - 292
SICI:
1434-6044(199909)10:2<271:NAOTDI>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
CHIRAL PERTURBATION-THEORY; TO-LEADING ORDER; HADRONIC MATRIX-ELEMENTS; DELTA-I=1/2 RULE; K->PI-PI DECAYS; QCD CORRECTIONS; CP VIOLATION; CONSISTENT ANALYSIS; MASS DIFFERENCE; 1/N-C EXPANSION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
80
Recensione:
Indirizzi per estratti:
Indirizzo: Hambye, T Ist Nazl Fis Nucl, Lab Nazl Frascati, POB 13, I-00044 Frascati, Italy Ist Nazl Fis Nucl POB 13 Frascati Italy I-00044 Frascati, Italy
Citazione:
T. Hambye et al., "New analysis of the Delta I=1/2 rule in kaon decays and the ((B)-over-cap)(K) parameter", EUR PHY J C, 10(2), 1999, pp. 271-292

Abstract

We present a new analysis of the Delta I = 1/2 rule in K --> pi pi decays and the (B) over bar(K) parameter. We use the 1/N-c expansion in the effective chiral lagrangian for the pseudoscalar mesons and compute the hadronic matrix elements at leading and next-to-leading order in the chiral and the 1/N-c expansions. Numerically, our calculation reproduces the dominant Delta I = 1/2 K --> pi pi amplitude. Our result depends only moderately on the choice of the cutoff scale in the chiral loops. The Delta I = 3/2 amplitudeemerges sufficiently suppressed but shows a significant dependence on the cutoff. The (B) over cap(K) parameter turns out to be smaller than the value previously obtained in the 1/N-c approach. It also shows a significant dependence on the choice of the cutoff scale. Our results indicate that corrections from higher order terms and/or higher resonances are large for the Delta I = 3/2 K --> nn amplitude and the (\Delta S\ = 2) K-0-(K) over bar(0)transition amplitude.

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Documento generato il 23/09/20 alle ore 13:11:13