Twist-4 distribution amplitudes of the<i>K</i>* and ϕ mesons in QCD

Ball, Patricia; Braun, Vladimir M.; Lenz, Alexander

doi:10.1088/1126-6708/2007/08/090

Cited by 127 publications

(185 citation statements)

References 47 publications

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“…The parameter ζ 4ρ was evaluated in the context of QCD sum rule approach at the renormalization scale µ = 1 GeV in Ref. [48] and is equal to ζ 4ρ = 0.07 ± 0.03.…”

Section: Resonancementioning

confidence: 99%

Treating Zc(3900) and Z(4430) as the ground state and first radially excited tetraquarks

2017

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Exploration of the resonances Zc(3900) and Z(4430) are performed by assuming that they are ground-state and first radial excitation of the same tetraquark with J P = 1 + . The mass and current coupling of the Zc(3900) and Z(4430) states are calculated using QCD two-point sum rule method by taking into account vacuum condensates up to eight dimensions. We investigate the vertices ZcM h M l and ZM h M l , with M h and M l being the heavy and light mesons, and evaluate the strong couplings gZ cMhMl and gZM h M l using QCD sum rule on the light cone. The extracted couplings allow us to find the partial width of the decays Zc(3900) → J/ψπ; ψ ′ π; ηcρ and Z(4430) → ψ ′ π; J/ψπ; η ′ c ρ; ηcρ, which may help in comprehensive investigation of these resonances. We compare width of the decays of Zc(3900) and Z(4430) resonances with available experimental data as well as existing theoretical predictions.

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“…The parameter ζ 4ρ was evaluated in the context of QCD sum rule approach at the renormalization scale µ = 1 GeV in Ref. [48] and is equal to ζ 4ρ = 0.07 ± 0.03.…”

Section: Resonancementioning

confidence: 99%

Treating Zc(3900) and Z(4430) as the ground state and first radially excited tetraquarks

2017

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“…In this contribution, we report that to leading power accuracy, predictions generated with alternative AdS/QCD DAs agree with those predicted with standard Sum Rules DAs [6] but that beyond leading power accuracy, AdS/QCD DAs offer the advantage of avoiding the end-point divergence problem. Furthermore, the AdS/QCD predictions agree with experiment.…”

Section: Introductionmentioning

confidence: 71%

Predicting radiative B decays to vector mesons in holographic QCD

Ahmady¹,

Sandapen²

2013

Proceedings of XXI International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS 2013)

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“…The nonperturbative parameters which enter in these formulas have been taken from Ref. [24] at the scale µ = 1 GeV:…”

Section: Phenomenologymentioning

confidence: 99%

“…The properties of the DAs, except the pure gluonic ones, have been discussed in Refs. [21][22][23][24]. The two-particle functions are symmetrical with respect to exchange x ↔x and normalised as…”

Section: A Light-cone Distribution Amplitudes Of the Vector Mesonsmentioning

confidence: 99%

Radiative decays χcJ→Vγ within the QCD factorization framework

Kivel

Vanderhaeghen

2017

Phys. Rev. D

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We present a discussion of radiative decays χ cJ → γρ(ω, φ). The decay amplitudes are computed within the QCD factorisation framework. NRQCD has been used in the heavy meson sector as well as a collinear expansion in order to describe the overlap with light mesons in the final state. The colour-singlet contributions to all helicity amplitudes have been computed using the light-cone distribution amplitudes of twist-2 and twist-3. All obtained expressions are well defined at least in the leading-order approximation. The colour-octet contributions have also been studied in the Coulomb limit in order to exhibit their scaling behaviour. In order to understand the relevance of the different contributions we perform numerical estimates using the colour-singlet contributions. For the χ c1 → γV ⊥ decays, to vector mesons with transverse polarisation, we find that the colour-singlet contribution potentially allows for a reliable description. On the other hand, for the χ c1 → γV decays, to vector mesons with longitudinal polarisation, our findings indicate that the colour-octet mechanism may be important for a good description. We expect that more accurate measurements of the decay χ c2 → γV ⊥, can help to better understand the mechanism of radiative decays.

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Twist-4 distribution amplitudes of theK* and ϕ mesons in QCD

Cited by 127 publications

References 47 publications

Treating Zc(3900) and Z(4430) as the ground state and first radially excited tetraquarks

Treating Zc(3900) and Z(4430) as the ground state and first radially excited tetraquarks

Predicting radiative B decays to vector mesons in holographic QCD

Radiative decays χcJ→Vγ within the QCD factorization framework

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