Mixanthropy and metamorphosis

Aston, Emma

doi:10.4000/books.pulg.1629

Cited by 1 publication

(2 citation statements)

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“…The main approximation is to reduce the sum over the inelastic many-body channels in the unitarity equations to a finite number of two-body channels. This is supported by the experiments performed by the LASS Collaboration in the center-of-mass energy range m K < 2:5 GeV [21][22][23]45]. They find that the inelasticity in the S-wave is dominated by one channel, K 0 , and in the P-wave by two channels, K Ã and K. Then, TABLE I.…”

Section: B K Form Factorsmentioning

confidence: 62%

“…We will perform a construction based on general properties of analyticity, QCD asymptotic counting rules [20], and using accurate experimental data on K scattering, both in the elastic and inelastic region. Such data have been obtained in the relatively high statistics LASS experiment on K À proton interaction [21][22][23]. A specific feature of K scattering at medium energies is that inelasticity is dominated by two-body or quasi-two-body channels.…”

Section: Introductionmentioning

confidence: 99%

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CPviolation and kaon-pion interactions inB→Kπ+π−decays

El-Bennich

Furman²,

Kamiński

et al. 2009

Phys. Rev. D

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We study CP violation and the contribution of the strong kaon-pion interactions in the three-body B ! K þ À decays. We extend our recent work on the effect of the two-pion S-and P-wave interactions to that of the corresponding kaon-pion ones. The weak amplitudes have a first term derived in QCD factorization and a second one as a phenomenological contribution added to the QCD penguin amplitudes. The effective QCD coefficients include the leading order contributions plus next-to-leading order vertex and penguins corrections. The matrix elements of the transition to the vacuum of the kaon-pion pairs, appearing naturally in the factorization formulation, are described by the strange K scalar (S-wave) and vector (P-wave) form factors. These are determined from Muskhelishvili-Omnès coupled channel equations using experimental kaon-pion T-matrix elements, together with chiral symmetry and asymptotic QCD constraints. From the scalar form factor study, the modulus of the K Ã 0 ð1430Þ decay constant is found to be ð32 AE 5Þ MeV. The additional phenomenological amplitudes are fitted to reproduce the K effective mass and helicity angle distributions, the B ! K Ã ð892Þ branching ratios and the CP asymmetries of the recent data from Belle and BABAR collaborations. We use also the new measurement by the BABAR group of the phase difference between the B 0 and " B 0 decay amplitudes to K Ã ð892Þ. Our predicted B AE ! K Ã 0 ð1430Þ AE , K Ã 0 ð1430Þ ! K AE Ç branching fraction, equal to ð11:6 AE 0:6Þ Â 10 À6 , is smaller than the result of the analyzes of both collaborations. For the neutral B 0 decays, the predicted value is ð11:1 AE 0:5Þ Â 10 À6 . In order to reduce the large systematic uncertainties in the experimental determination of the B ! K Ã 0 ð1430Þ branching fractions, a new parametrization is proposed. It is based on the K scalar form factor, well constrained by theory and experiments other than those of B decays.

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Section: B K Form Factorsmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%