Light hadron weak matrix elements

Lellouch, Laurent

doi:10.1016/s0920-5632(01)00968-9

Cited by 34 publications

(26 citation statements)

References 55 publications

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“…We may thus consider it a further motivation for the lattice study to corroborate this prediction of the large-N c approach. Note that near the physical point (m K > 0) a considerably larger value is found (for recent reviews, see [36]). …”

Section: Weak Operators In the Su(3) Chiral Theorymentioning

confidence: 99%

Correlators of left charges and weak operators in finite volume chiral perturbation theory

Hernández

Laine

2003

J. High Energy Phys.

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We compute the two-point correlator between left-handed flavour charges, and the three-point correlator between two left-handed charges and one strangeness violating ∆I = 3/2 weak operator, at next-to-leading order in finite volume SU(3) L ×SU(3) R chiral perturbation theory, in the so-called ǫ-regime. Matching these results with the corresponding lattice measurements would in principle allow to extract the pion decay constant F , and the effective chiral theory parameter g 27 , which determines the ∆I = 3/2 amplitude of the weak decays K → ππ as well as the kaon mixing parameterB K in the chiral limit. We repeat the calculations in the replica formulation of quenched chiral perturbation theory, finding only mild modifications. In particular, a properly chosen ratio of the three-point and two-point functions is shown to be identical in the full and quenched theories at this order.

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Section: Weak Operators In the Su(3) Chiral Theorymentioning

confidence: 99%

Correlators of left charges and weak operators in finite volume chiral perturbation theory

Hernández

Laine

2003

J. High Energy Phys.

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“…In this expression m K 0 = 498 MeV is the K 0 mass, f K = 160 MeV the kaon decay constant taken from experiment andB K = 0.86 ± 0.15 [60] is the bag parameter. The QCD corrections are η…”

Section: K 0 Oscillationsmentioning

confidence: 99%

Erratum: Effects of mixing with quark singlets [Phys. Rev. D67, 035003 (2003)]

2004

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The mixing of the known quarks with new heavy singlets can modify significantly some observables with respect to the Standard Model predictions. We analyse the range of deviations permitted by the constraints from precision electroweak data and flavour-changing neutral processes at low energies. We study top charged current and neutral current couplings, which will be directly tested at top factories, like LHC and TESLA. We discuss some examples of observables from K and B physics, as the branching ratio of K L → π 0 νν, the B 0 s mass difference or the time-dependent CP asymmetry in B 0 s → D + s D − s , which can also show large new effects.

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“…On the one hand, the ∆I = 1/2 operators suffer from power divergences in the ultraviolet cutoff, 1/a. These divergences, that cannot be subtracted using perturbation theory [1], can be eliminated by performing suitable numerical subtractions. The subtraction procedure, however, suffers from systematic uncertainties which are difficult to keep under control, see below.…”

Section: General Frameworkmentioning

confidence: 99%

“…In total I counted 38 talks in the parallel sessions and 13 posters. It is clear that it would have been impossible to discuss all this material, to which two accurate and complete review talks by L. Lellouch [1] and S. Sint [2] were dedicated at Bangalore. A selection of the subjects has been then unavoidable and I apologize to the authors of submitted contributions and to the speakers of talks given in the parallel sessions which I had to omit in my review.…”

Section: Introductionmentioning

confidence: 99%