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Titolo: Theory of the CPviolating parameter epsilon '/epsilon
Autore: Bertolini, S; Fabbrichesi, M; Eeg, JO;
 Indirizzi:
 Ist Nazl Fis Nucl, Sez Trieste, I34013 Trieste, Italy Ist Nazl Fis Nucl Trieste Italy I34013 Trieste, I34013 Trieste, Italy Scuola Int Super Studi Avanzati, I34013 Trieste, Italy Scuola Int Super Studi Avanzati Trieste Italy I34013 013 Trieste, Italy Univ Oslo, Inst Fys, N0316 Oslo, Norway Univ Oslo Oslo Norway N0316Univ Oslo, Inst Fys, N0316 Oslo, Norway
 Titolo Testata:
 REVIEWS OF MODERN PHYSICS
fascicolo: 1,
volume: 72,
anno: 2000,
pagine: 65  93
 SICI:
 00346861(200001)72:1<65:TOTCPE>2.0.ZU;2S
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 CHIRAL PERTURBATIONTHEORY; TOLEADING ORDER; HADRONIC MATRIXELEMENTS; NEUTRAL KAON SYSTEM; ANOMALOUS DIMENSION MATRIX; WEAK NONLEPTONIC DECAYS; LASINIOLIKE MODELS; NONLEPTONIC DECAYS; STRANGE QUARK MASS; K>PIPI 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, I34013 Trieste, Italy Ist Nazl Fis Nucl Trieste Italy I34013 4013 Trieste, Italy



 Citazione:
 S. Bertolini et al., "Theory of the CPviolating parameter epsilon '/epsilon", REV M PHYS, 72(1), 2000, pp. 6593
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 shortdistance part of the computation is now known to the nexttoleading 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 matrixelement parameters in the various approaches are discussed, together with the allowed range of quark mixing angles in the CabibboKobayashiMaskawa matrix. All recent predictions of epsilon'/epsilon are summarized and compared. Because of the intrinsic uncertainties of the longdistance 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 newphysics effects can bedisentangled from the standardmodel prediction.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/09/20 alle ore 08:43:11