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Titolo:
The standard model prediction for epsilon '/epsilon
Autore:
Pallante, E; Pich, A; Scimemi, I;
Indirizzi:
SISSA, I-34013 Trieste, Italy SISSA Trieste Italy I-34013SISSA, I-34013 Trieste, Italy Univ Politecn Valencia, CSIC, IFIC, Dept Fis Teor, E-46071 Valencia, SpainUniv Politecn Valencia Valencia Spain E-46071 r, E-46071 Valencia, Spain
Titolo Testata:
NUCLEAR PHYSICS B
fascicolo: 1-3, volume: 617, anno: 2001,
pagine: 441 - 474
SICI:
0550-3213(200112)617:1-3<441:TSMPFE>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
CHIRAL PERTURBATION-THEORY; STRANGE-QUARK MASS; TO-LEADING ORDER; DIRECT CP VIOLATION; HADRONIC MATRIX-ELEMENTS; NONLEPTONIC WEAK-INTERACTIONS; ANOMALOUS DIMENSION MATRIX; SMALL-DISTANCE-BEHAVIOUR; NEUTRAL KAON SYSTEM; K-L4 FORM-FACTORS;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
171
Recensione:
Indirizzi per estratti:
Indirizzo: Scimemi, I SISSA, Via Beirut 2-4, I-34013 Trieste, Italy SISSA Via Beirut 2-4 Trieste Italy I-34013 4013 Trieste, Italy
Citazione:
E. Pallante et al., "The standard model prediction for epsilon '/epsilon", NUCL PHYS B, 617(1-3), 2001, pp. 441-474

Abstract

We present a detailed analysis of epsilon'/epsilon within the Standard Model, taking into account the strong enhancement through final-state interactions identified by Pallante and Pich in Phys. Rev. Lett. 84 (2000) 2568 andNucl. Phys. B 592 (2000) 294. The relevant hadronic matrix elements are fixed at leading order in the 1/N-C expansion, through a matching procedure between the effective short-distance Lagrangian and its corresponding low-energy description in Chiral Perturbation Theory. All large logarithms are summed up, both at short and long distances. Two different numerical analysesare performed, using either the experimental or the theoretical value for epsilon, with compatible results. We obtain Re(epsilon'/epsilon) = (1.7 +/-0.9) x 10(-3). The error is dominated by the uncertainty in the value of the strange quark mass and the estimated corrections from unknown 1/N-C-suppressed local contributions. A better estimate of the strange quark mass would reduce the uncertainty to about 30%. The Standard Model prediction agrees with the present experimental world average Re(epsilon'/epsilon) (1.93 +/- 0.24) x 10(-3). (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 29/03/20 alle ore 17:33:32