Some heavy vector and tensor meson decay constants in light-front quark model

Geng, Chao–Qiang; Lih, C. C.; Xia, Cathy H.

doi:10.1140/epjc/s10052-016-4172-z

Cited by 23 publications

(20 citation statements)

References 55 publications

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“…For the former, their values have been suggested in many previous works, for instance, Refs. [68,71,72,75]; in addition, they can also be obtained from the variational principle [27,28,76]; but the errors are not evaluated in these previous works.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Revisiting the form factors of $P\to V$ transition within the light-front quark models

Chang,

Li,

Wang

2019

Preprint

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We investigate the self-consistency and Lorentz covariance of the covariant light-front quark model (CLF QM) via the matrix elements and form factors (F = g, a ± and f ) of P → V transition. Two types of correspondence schemes between the manifest covariant Bethe-Salpeter approach and the light-front quark model are studied. We find that, for a − (q 2 ) and f (q 2 ), the CLF results obtained via λ = 0 and ± polarization states of vector meson within the traditional type-I correspondence scheme are inconsistent with each other; and moreover, the strict covariance of the matrix element is violated due to the nonvanishing spurious contributions associated with noncovariance. We further show that such two problems have the same origin and can be resolved simultaneously by employing the type-II correspondence scheme, which advocates an additional replacement M → M 0 relative to the traditional type-I scheme; meanwhile, the results of F(q 2 ) in the standard light-front quark model (SLF QM) are exactly the same as the valence contributions and equal to numerally the full results in the CLF QM, i.e., [F] SLF = [F] val.. = [F] full . The numerical results for some P → V transitions are updated within the type-II scheme.Above findings confirm the conclusion obtained via the decay constants of vector and axial-vector mesons in the previous works.

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Section: Numerical Results and Discussionmentioning

confidence: 99%

Revisiting the form factors of $P\to V$ transition within the light-front quark models

Chang,

Li,

Wang

2019

Preprint

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“…Using light-cone wave function, the decay constants of the pseudoscalar and vector meson are given by [5] f P = 2…”

Section: Pos(dis2017)143mentioning

confidence: 99%

“…We plot the decay constants f P and f V of B d and B s mesons as functions of parameter β in the LCQM using the constituent quark masses given by [5] m Figs. 1 and 2 show the dependence of the decay constants with respect to the parameter β which indicate that in order to get the reliable results for the decay constants, it is essential to obtain the precise value of β .…”

Section: Pos(dis2017)143mentioning

confidence: 99%

“…The decays of B-mesons play an important role in determining the parameters of the SM and some hadronic parameters in quantum chromodynamics (QCD), such as CKM matrix elements [4] and the meson decay constants [5]. The decay constant of a meson is an useful parameter to study the weak decay processes such as quark mixing, CP violation, etc.…”

Section: Introductionmentioning

confidence: 99%

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Decay constants of $B$ mesons in the light cone quark model

Dhiman

Dahiya

Randhawa³

2017

Proceedings of XXV International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2017)

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We study the pseudoscalar and vector B mesons decay constants within the framework of the light cone quark model (LCQM). LCQM deals with the wave function defined on the four-dimensional space-time plane defined by x + = x 0 + x 3 and includes the important relativistic effects that are neglected in the traditional constituent quark model. With the help of known values of constituent quark masses and the scale parameter β , we calculate the values of B mesons decay constants, respectively. The decay constants of pseudoscalar and vector mesons are useful for controlling the meson semileptonic decay widths, hadronic couplings and form factors.

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“…(16) would be replaced simply by γ 5 [47][48][49]. Very recently, this spin structure has been used to evaluate the holographic DA of π meson in Ref.…”

Section: Introductionmentioning

confidence: 99%

Light-front holographic distribution amplitudes of pseudoscalar mesons and their application to B -meson decays

Chang¹,

Brodsky²,

Li³

2017

Phys. Rev. D

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In this paper the dynamical spin effects of the light-front holographic wavefunctions for light pseudoscalar mesons are studied using two different assumptions. These improved wavefunctions are then confronted with a number of sensitive hadronic observables: the decay constants of π and K mesons, their ξ-moments, the pion-to-photon transition form factor, and the pure annihilationBand their ratio f K /f π as constraint conditions, the χ 2 analyses for holographic parameters, including the mass scale parameter √ λ and effective quark masses, are all consistent with the mass scale which controls the slopes of the light-quark hadronic Regge trajectories. In addition, we also show how the improved light-front holographic distribution amplitudes regulate the end-point divergences which appear in the annihilation amplitudes of B → P P decays.

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Some heavy vector and tensor meson decay constants in light-front quark model

Abstract: We study the decay constants ( f M ) of the heavy vector

Cited by 23 publications

References 55 publications

Revisiting the form factors of $P\to V$ transition within the light-front quark models

Revisiting the form factors of $P\to V$ transition within the light-front quark models

Decay constants of $B$ mesons in the light cone quark model

Light-front holographic distribution amplitudes of pseudoscalar mesons and their application to B -meson decays

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