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Titolo:
Theoretical status of epsilon '/epsilon
Autore:
Nierste, U;
Indirizzi:
Fermi Natl Accelerator Lab, Div Theory, Batavia, IL 60510 USA Fermi Natl Accelerator Lab Batavia IL USA 60510 ry, Batavia, IL 60510 USA
Titolo Testata:
NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS
, volume: 86, anno: 2000,
pagine: 329 - 338
SICI:
0920-5632(200006)86:<329:TSOE'>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
STRANGE QUARK MASS; HADRONIC MATRIX-ELEMENTS; LEADING ORDER; CP VIOLATION; TOP-QUARK; B-DECAYS; QCD; OPERATORS; RULE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
61
Recensione:
Indirizzi per estratti:
Indirizzo: Nierste, U Fermi Natl Accelerator Lab, Div Theory, MS106, Batavia, IL 60510 USA Fermi Natl Accelerator Lab MS106 Batavia IL USA 60510 60510 USA
Citazione:
U. Nierste, "Theoretical status of epsilon '/epsilon", NUCL PH B-P, 86, 2000, pp. 329-338

Abstract

I give a detailed introduction into the theoretical formalism for epsilon'/epsilon, which measures direct CP-violation in K --> pi pi decays. The current status of hadronic matrix elements and the strange quark mass is discussed. Several possible explanations of the unexpectedly high experimental results for epsilon'/epsilon are pointed out: A small strange quark mass, anenhancement of the hadronic parameter B-6((1/2))) from the sigma resonance, an underestimate of isospin breaking and possible new physics contributions in the (s) over bar dZ-vertex and the (s) over bar d-gluon-vertex.

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Documento generato il 28/09/20 alle ore 18:23:31