Perturbative QCD correction to the light-cone sum rule for the and couplings

Khodjamirian, Alexander; Rückl, R.; Weinzierl, Stefan; Yakovlev, O. I.

doi:10.1016/s0370-2693(99)00518-3

Cited by 90 publications

(136 citation statements)

References 11 publications

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“…Eqs. (17) and (18) shows that the coupling constants in the vertices D * D s K and D * s DK are consistent with each other, but that they are smaller than the value given by the SU(4) symmetry in the ref. [4].…”

supporting

confidence: 52%

Coupling constants of DDsK and DsDK processes

Bracco¹,

Lozéa²,

Cerqueira³

et al. 2007

Braz. J. Phys.

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We calculate the coupling constants of D * D s K and D * s DK vertices using the QCD sum rules technique. We compare our results with results obtained in the limit of SU(4) symmetry and we found that the symmetry is broken at the order of 40%.Keywords: Coupling constants; Form Factors; QCD Sum RuleThe knowledge of coupling constants in hadronic vertices is crucial to estimate cross sections when hadronic degrees of freedom are used. The kaon is one of the commovers light mesons that can annihilate the charmonium in a nuclear medium, given as result D and D s mesons. Therefore, the absorption of charmonium by kaons in a nuclear medium can be used to study the J/ψ suppression in heavy-ion collisions, which is one of the signatures of the formation of the quark gluon plasma (QGP) [1]. The processes of absorption of J/Ψ by kaons can be visualized in the Figure 1.To evaluate theoretically the cross section for these processes, one can use the approach based on effective SU(4) Lagrangians [2,4]. The effective Lagrangians that describe the processes represented in Fig

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supporting

confidence: 52%

Coupling constants of DDsK and DsDK processes

Bracco¹,

Lozéa²,

Cerqueira³

et al. 2007

Braz. J. Phys.

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“…[48] predicts g D * Dπ = 3.7 ± 1.1, i.e., g = 0.34 close to the "unlikely" light-front value), which are much smaller than the data. However, in a recent reanalysis of the D * Dπ coupling in the framework of the light-cone QCD sum rule [49] it was pointed out how agreement with the data could be attained (another attempt has been published in [50]).…”

Section: +04mentioning

confidence: 59%

Consistent treatment of spin-1 mesons in the light-front quark model

Jaus

2003

Phys. Rev. D

121

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We analyze the matrix element of the electroweak current between qq vector meson states in the framework of a covariant extension of the light-front formalism. The light-front matrix element of a one-body current is naturally associated with zero modes, which affect some of the form factors that are necessary to represent the Lorentz structure of the light-front integral. The angular condition contains information on zero modes, i.e., only if the effect of zero modes is accounted for correctly, is it satisfied. With plausible assumptions we derive from the angular condition several consistency conditions which can be used quite generally to determine the zero mode contribution of form factors. The correctness of this method is tested by the phenomenological success of the derived form factors. We compare the predictions of our formalism with those of the standard light-front approach and with available data. As examples we discuss the magnetic moment of the ρ, the coupling constant g D * Dπ , and the coupling constants of the pseudoscalar density, g π and g K , which provide a phenomenological link between constituent and current quark masses.

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“…While a recent (quenched) lattice study suggests that the gcoupling does not change when increasing the heavy quark mass (g b ≈ g c ) [13], the light cone QCD sum rule calculation predicts the suppression by about 25% (i.e. g b /g c ≈ 0.75) [14]. We will take the average of the two predictions and add the difference in the systematic uncertainty, i.e.…”

mentioning

confidence: 99%

“…Notice in particular that the value of K/L 5 ratio follows from the present value of α − β = 0.00 ± 0.06, discussed in the previous section, through the use of eq. (14). That uncertainty may easily be reduced by the direct lattice calculation of the ratio R.…”

mentioning

confidence: 99%

Chiral corrections and lattice QCD results for f/f and Δm/Δm

et al. 2003

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It has been argued recently that the inclusion of the chiral logarithms in extrapolation of the lattice data can shift the value of the hadronic parameter ξ = f Bs B Bs /f B d B B d , from 1.16(6) to 1.32(10) and even higher. If true, that would considerably change the theoretical estimate for the ratio of oscillation frequencies in the B 0 s -and B 0 d -systems, and would affect the standard CKM unitarity triangle analysis. In this letter we show that f Bs /f B d ≈ f K /f π , and thus the uncertainty due to the missing chiral logs is smaller than previously thought. By combining the NLO chiral expansion with the static heavy quark limit we obtain ξ = 1.22(8). Uncertainty in ∆mThe K 0 −K 0 and B 0 −B 0 mixing amplitudes are the main ingredients in the standard unitarity triangle analysis [1]. They overconstrain the apex of the CKM triangle in the (ρ,η)-plane. Confronting such an overconstrained triangle with the directly measured sin(2β) [2] allows for the consistency check from which we hope to either see the effects of the non-Standard Model physics, or simply to confirm the validity of Standard Model at the accessible accuracy [3]. One of the essential constraints is provided by the ratio of oscillation frequencies ∆m

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Perturbative QCD correction to the light-cone sum rule for the and couplings

Cited by 90 publications

References 11 publications

Coupling constants of DDsK and DsDK processes

Coupling constants of DDsK and DsDK processes

Consistent treatment of spin-1 mesons in the light-front quark model

Chiral corrections and lattice QCD results for f/f and Δm/Δm

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Perturbative QCD correction to the light-cone sum rule for the and couplings

Cited by 90 publications

References 11 publications

Coupling constants of D*DsK and Ds*DK processes

Coupling constants of D*DsK and Ds*DK processes

Consistent treatment of spin-1 mesons in the light-front quark model

Chiral corrections and lattice QCD results for f/f and Δm/Δm

Contact Info

Product

Resources

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Coupling constants of DDsK and DsDK processes

Coupling constants of DDsK and DsDK processes