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Titolo:
A short look at epsilon '/epsilon
Autore:
Keum, YY; Nierste, U; Sanda, AI;
Indirizzi:
KEK, Theory Grp, Ibaraki, Osaka 3050801, Japan KEK Ibaraki Osaka Japan 3050801 Theory Grp, Ibaraki, Osaka 3050801, Japan Fermi Natl Accelerator Lab, Theory Div MS106, Batavia, IL 60510 USA Fermi Natl Accelerator Lab Batavia IL USA 60510 06, Batavia, IL 60510 USA Nagoya Univ, Dept Phys, Nagoya, Aichi 446, Japan Nagoya Univ Nagoya AichiJapan 446 v, Dept Phys, Nagoya, Aichi 446, Japan
Titolo Testata:
PHYSICS LETTERS B
fascicolo: 1-3, volume: 457, anno: 1999,
pagine: 157 - 162
SICI:
0370-2693(19990617)457:1-3<157:ASLAE'>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
HADRONIC MATRIX-ELEMENTS; TO-LEADING ORDER; ANOMALOUS DIMENSION MATRIX; WEAK NONLEPTONIC DECAYS; NEUTRAL KAON SYSTEM; DIRECT CP VIOLATION; LIGHT-QUARK MASSES; LARGE-N LIMIT; QCD CORRECTIONS; K->PI-PI DECAYS;
Keywords:
violation, CP; interpretation of experiments; quark, mass; new interaction, search for; K0;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Keum, YY KEK, Theory Grp, Ibaraki, Osaka 3050801, Japan KEK Ibaraki OsakaJapan 3050801 p, Ibaraki, Osaka 3050801, Japan
Citazione:
Y.Y. Keum et al., "A short look at epsilon '/epsilon", PHYS LETT B, 457(1-3), 1999, pp. 157-162

Abstract

We analyze the theoretical implications of the new KTeV measurement of direct CP-violation in K --> pi pi decays. The result is found consistent withthe Standard Model for low values of the strange quark mass m(s). If the hadronic parameters B-6((1/2)) and B-8((3/2)) satisfy 2B(6)((1/2)) - B-8((3/2)) less than or equal to 2, as suggested by lattice and 1/N-c calculations, we find an upper bound of 110MeV for m(s)(2 GeV). We parametrize potential new physics contributions to epsilon' / epsilon and illustrate their correlation with upper bounds an m(s). Finally we discuss a non-perturbative mechanism, which is not contained in the existing calculations of B-6((1/2)). This mechanism enhances B-6((1/2)) and thereby leads to a better understanding of the Delta I = 1/2 rule and the high measured value of Re(epsilon' /epsilon). (C) 1999 Published by Elsevier Science B.V. All rights reserved.

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Documento generato il 28/09/20 alle ore 18:41:33