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Titolo:
THE EFFECT OF HIGHER-DIMENSIONAL OPERATORS IN K-]PI-PI DECAYS
Autore:
MELSOM J;
Indirizzi:
UNIV OSLO,INST PHYS,POB 1048 N-0316 OSLO 3 NORWAY
Titolo Testata:
Zeitschrift fur Physik. C, Particles and fields
fascicolo: 3, volume: 75, anno: 1997,
pagine: 471 - 476
SICI:
0170-9739(1997)75:3<471:TEOHOI>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
HADRONIC MATRIX-ELEMENTS; TO-LEADING ORDER; QUARK-MODEL; QCD; EPSILON'/EPSILON; TRANSITIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
J. Melsom, "THE EFFECT OF HIGHER-DIMENSIONAL OPERATORS IN K-]PI-PI DECAYS", Zeitschrift fur Physik. C, Particles and fields, 75(3), 1997, pp. 471-476

Abstract

We reexamine the weak Delta S = 1 sector by including higher-dimensional four-quark operators in the low-energy effective Lagrangian L-eff(Delta S=1). The introduction of a physical cut-off Lambda similar or equal to 1 GeV as an effective mass scale in QCD allows for a systematic expansion in powers of p/Lambda where p denotes some external quark momentum. Within this framework analytical expressions for the higher-dimensional operators are obtainable. By means of the chiral quark model we evaluate K --> pi pi matrix elements of L-eff(Delta S=1) and identify the corrections to the isospin decay channels g((1/2)) and g((3/2)). While little affecting Delta I = 1/2 transitions the effect is substantial in the Delta I = 3/2 case where it amounts to a 40% enhancement numerically.

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Documento generato il 28/09/20 alle ore 18:40:17