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Titolo:
Theory of the CP-violating parameter epsilon '/epsilon
Autore:
Bertolini, S; Fabbrichesi, M; Eeg, JO;
Indirizzi:
Ist Nazl Fis Nucl, Sez Trieste, I-34013 Trieste, Italy Ist Nazl Fis Nucl Trieste Italy I-34013 Trieste, I-34013 Trieste, Italy Scuola Int Super Studi Avanzati, I-34013 Trieste, Italy Scuola Int Super Studi Avanzati Trieste Italy I-34013 013 Trieste, Italy Univ Oslo, Inst Fys, N-0316 Oslo, Norway Univ Oslo Oslo Norway N-0316Univ Oslo, Inst Fys, N-0316 Oslo, Norway
Titolo Testata:
REVIEWS OF MODERN PHYSICS
fascicolo: 1, volume: 72, anno: 2000,
pagine: 65 - 93
SICI:
0034-6861(200001)72:1<65:TOTCPE>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
CHIRAL PERTURBATION-THEORY; TO-LEADING ORDER; HADRONIC MATRIX-ELEMENTS; NEUTRAL KAON SYSTEM; ANOMALOUS DIMENSION MATRIX; WEAK NONLEPTONIC DECAYS; LASINIO-LIKE MODELS; NON-LEPTONIC DECAYS; STRANGE QUARK MASS; K->PI-PI DECAYS;
Tipo documento:
Review
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
125
Recensione:
Indirizzi per estratti:
Indirizzo: Bertolini, S Ist Nazl Fis Nucl, Sez Trieste, I-34013 Trieste, Italy Ist Nazl Fis Nucl Trieste Italy I-34013 4013 Trieste, Italy
Citazione:
S. Bertolini et al., "Theory of the CP-violating parameter epsilon '/epsilon", REV M PHYS, 72(1), 2000, pp. 65-93

Abstract

The real part of epsilon'/epsilon measures direct CP violation in the decays of neutral kaons into two pions. This is a fundamental quantity that hasjustly attracted a great deal of theoretical as well as experimental work. Determination of its value may answer the question of whether CP violationis present only in the mass matrix of neutral kaons (the superweak scenario) or whether it is also at work directly in the decay amplitudes. After a brief historical summary, the present and expected experimental sensitivities are discussed. In light of these, the authors address the problem of estimating epsilon'/epsilon in the standard model and review the status of thetheoretical predictions of epsilon'/epsilon as of the beginning of 1999. The short-distance part of the computation is now known to the next-to-leading order in QCD and QED and is therefore well under control. On the other hand, the evaluation of the hadronic matrix elements of the relevant operators is where most of the theoretical uncertainty still resides. The authors analyze the results of the most extensive calculations to date. The values of the matrix-element parameters in the various approaches are discussed, together with the allowed range of quark mixing angles in the Cabibbo-Kobayashi-Maskawa matrix. All recent predictions of epsilon'/epsilon are summarized and compared. Because of the intrinsic uncertainties of the long-distance computations, values ranging from 10(-4) to a few times 10(-3) can be accounted for in the standard model. Since this range covers most of the present experimental uncertainty, it is unlikely that new-physics effects can bedisentangled from the standard-model prediction.

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Documento generato il 25/09/20 alle ore 08:43:11