Decay constants of pseudoscalar and vector mesons with improved holographic wavefunction

Chang, Qin; Li, Xiao-Nan; Li, Xin-Qiang; Su, Fang

doi:10.48550/arxiv.1805.00718

Cited by 3 publications

(5 citation statements)

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“…Qin Chang et. [9]. Our results for the ratios of decay constants, f Bs = 0.974 ± 0.010, have also been given with LQCD approach calculations [28], which are similar to what we get.…”

Section: Masses and Leptonic Branching Fractionssupporting

confidence: 87%

“…The decay constants of heavy-light mesons play an important role in particle physics such as the B 0 − B0 mixing, the treatment of nonleptonic heavy flavour decays in the factorization approximation, the analysis of the CKM matrix element and also the connection of the leptonic constants to the wave function at the origin in the nonrelativistic quark model [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Decay properties of beauty and charm mesons within Isgur-Wise function formalism

Xiao¹,

Rahmani²,

Hassanabadi³

2020

Preprint

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We investigate the decay properties of some beauty and charm mesons with a phenomenological potential model. First, we consider the nonrelativistic Hamiltonian of the mesonic system with Coulomb plus exponential terms and study the wave function and the energy of the system using the variational approach. Thereby, we compute the masses, the decay constants, the leptonic branching fractions of heavy-light mesons and the mixing mass parameter ∆m Bq . We study the radiative leptonic decay widths of D s → γ ν, D − → γ ν and the semileptonic decay widths of B(s) → D (s) ν, B(s) → D * (s) ν. Using Isgur-Wise functions, we calculate the branching ratios of B → D ( * ) π and two-body nonleptonic decay of D → Kπ. Our results are consistent with other theoretical models and the experimental results.

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“…Qin Chang et. [9]. Our results for the ratios of decay constants, f Bs = 0.974 ± 0.010, have also been given with LQCD approach calculations [28], which are similar to what we get.…”

Section: Masses and Leptonic Branching Fractionssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Decay properties of beauty and charm mesons within Isgur-Wise function formalism

Xiao¹,

Rahmani²,

Hassanabadi³

2020

Preprint

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“…where ε K * µ , m K * = 890 MeV and f K * = 204 MeV [182][183][184][185] are the polarization vector, the mass, and the decay constant of K * , respectively. The quark level amplitude I dsll can be obtained by calculating the one-loop level diagrams of Fig.…”

Section: B Hidden Local Symmetrymentioning

confidence: 99%

Quark level and hadronic contributions to the electric dipole moment of charged leptons in the standard model

Yamaguchi,

Yamanaka

2020

Preprint

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We evaluate the electric dipole moment (EDM) of charged leptons in the standard model, where the complex phase of the Cabibbo-Kobayashi-Maskawa matrix is the only source of CP violation. We first prove that, at the quark-gluon level, it is suppressed by a factor of m 2 b m 2 c m 2 s at all orders of perturbation due to the GIM mechanism. We then calculate the hadronic long distance contribution generated by vector mesons at one-loop level. The |∆S| = 1 weak hadronic interaction is derived using the factorization, and the strong interaction is modeled by the hidden local symmetry framework. We find that the EDMs of charged leptons obtained from this hadronic mechanism are much larger than the perturbative four-loop level quark-gluon process, by several orders of magnitude.

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“…However, such modification of the wave function did not improve the agreement of the decay constants with the experimental values. In [55][56][57] the wave function proposed in [21] was modifyed by considering a helicity-dependent holographic wavefunction. With this modification a better agreement, of the decay constants with data, is obtained in the case of light and heavy-light mesons.…”

Section: E Decay Constantsmentioning

confidence: 99%

“…With this modification a better agreement, of the decay constants with data, is obtained in the case of light and heavy-light mesons. However, the authors of [55][56][57] have not studied heavy-heavy mesons. Improvement for the predictions of the light vector mesons decay constants can also be obtained by extending the model to include dynamical spin effects in the LF wave functions [58,59].…”

Section: E Decay Constantsmentioning

confidence: 99%

Supersymmetry in the double-heavy hadronic spectrum

et al. 2018

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Relativistic light-front bound-state equations for double-heavy mesons, baryons and tetraquarks are constructed in the framework of supersymmetric light front holographic QCD. Although heavy quark masses strongly break conformal symmetry, supersymmetry and the holographic embedding of semiclassical light-front dynamics still holds. The theory, derived from five-dimensional antide Sitter space, predicts that the form of the confining potential in the light-front Hamiltonian is harmonic even for heavy quarks. Therefore, the basic underlying supersymmetric mechanism, which transforms meson-baryon and baryon-tetraquark wave functions into each other, can also be applied to the double-heavy sector; one can then successfully relate the masses of the double-heavy mesons to double-heavy baryons and tetraquarks. The dependence of the confining potential on the hadron mass scale agrees completely with the one derived in heavy light systems from heavy quark symmetry. We also make predictions for higher excitations of the charmonium and bottomonium states. In particular, the remarkable equality of the Regge slopes in the orbital angular momentum, L, and the principal quantum number, n, is predicted to remain valid. *

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Decay constants of pseudoscalar and vector mesons with improved holographic wavefunction

Cited by 3 publications

References 0 publications

Decay properties of beauty and charm mesons within Isgur-Wise function formalism

Decay properties of beauty and charm mesons within Isgur-Wise function formalism

Quark level and hadronic contributions to the electric dipole moment of charged leptons in the standard model

Supersymmetry in the double-heavy hadronic spectrum

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