Four-quark operators relevant to B meson lifetimes from QCD sum rules

M. S. Baek, Jungil Lee, Chun Liu, H. S. Song

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

At the order of 1/mb 3, the B meson lifetimes are controlled by the hadronic matrix elements of some four-quark operators. The nonfactorizable magnitudes of these four-quark operator matrix elements are analyzed by QCD sum rules in the framework of heavy quark effective theory. The vacuum saturation for color-singlet four-quark operators is justified at the hadronic scale, and the nonfactorizable effect is at a few percent level. However, for color-octet four-quark operators, the vacuum saturation is violated sizably so that the nonfactorizable effect cannot be neglected for the B meson lifetimes. The implication to the extraction of some of the parameters from B decays is discussed. The B meson lifetime ratio is predicted as τ(B-)/τ(B0) = 1.09±0.02. However, the experimental result of the lifetime ratio τ(Λb)/τ(B0) still cannot be explained.

Original languageEnglish
Pages (from-to)4091-4096
Number of pages6
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume57
Issue number7
Publication statusPublished - 1998 Apr 1
Externally publishedYes

Fingerprint

Sum Rules
Mesons
sum rules
Quarks
Lifetime
mesons
quantum chromodynamics
quarks
operators
life (durability)
Operator
Saturation
Vacuum
saturation
color
vacuum
Operator Matrix
octets
Percent
Decay

ASJC Scopus subject areas

  • Mathematical Physics
  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

Cite this

Four-quark operators relevant to B meson lifetimes from QCD sum rules. / Baek, M. S.; Lee, Jungil; Liu, Chun; Song, H. S.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 57, No. 7, 01.04.1998, p. 4091-4096.

Research output: Contribution to journalArticle

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