Weak radiative decays of antitriplet bottomed baryons in light-front quark model

Geng, Chao–Qiang; Liu, Chia-Wei; Wei, Zheng-Yi; Zhang, Jiabao

doi:10.1103/physrevd.105.073007

Cited by 13 publications

(2 citation statements)

References 94 publications

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“…respectively, where the definition of f T V 2 and the formalism of the branching ratio can be referred to Ref. [14]. The uncertainties come from the deviation between the effective quark mass and the pole mass schemes.…”

Section: Transition Matrix Elementsmentioning

confidence: 99%

Center of mass motion in bag model

Liu¹,

Geng²

2022

Preprint

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Despite the great success on the mass spectra, the reputation of the bag model has been closely followed by the embarrassment from the center of mass motion. It leads to severe theoretical inconsistencies. For instance, the masses and the decay constants would no longer be independent of the momentum. In this work, we provide a systematical approach to resolve this problem. The meson decay constants as well as the baryon transition form factors can be computed consistently in our framework. Notably, the form factors in the neutron β decays do not depend on any free parameters, and are determined to bewhich is well consistent to the experimental value of (7.1 ± 1.7) × 10 −5 . These results show that our approach for the center of mass motion in the bag model is suitable for both light and heavy quark systems.

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Section: Transition Matrix Elementsmentioning

confidence: 99%

Center of mass motion in bag model

Liu¹,

Geng²

2022

Preprint

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“…It is reliable at the zero recoil point (ω = 1), but unequal time commutators are needed for a boosted state, causing several uncertainties as ω goes up. On the other, the LFQM describes the bound state in a frame-independent way, in which only the relative motions between the constituents are required [15][16][17][18][19][20][21][22][23][24][25].…”

mentioning

confidence: 99%

Heavy quark symmetry in quark models

Zhang¹,

Xiang-Nan²,

Liu³

et al. 2022

Preprint

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We study the heavy quark symmetry with the homogeneous bag model (HBM) and lightfront quark model (LFQM) based on the decays of Λ 0 b → Λ + c ℓ − ν ℓ (ℓ = e, µ, τ ). In particular, we calculate various parameters in the heavy quark expansions, including the Isgur-Wise functions and their first order corrections. The parameters in the HBM are fitted from the mass spectra, while the ones in the LFQM are tightly constrained by the heavy quark symmetry, granting the predictive power of our results. We explicitly obtain that B(Λ 0 b → Λ + c e − ν e ) = (5.69 ± 0.58, 5.35 ± 0.50), B(Λ 0 b → Λ + c µ − ν µ ) = (5.67 ± 0.58, 5.33 ± 0.49), and3243 ± 0.0126, 0.3506 ± 0.0046) for the numerical values of (HBM, LFQM). Our results of the branching fractions in both models agree well with the experimental data and lattice QCD calculations. In addition, we find that the hard gluon corrections decrease the branching fractions around 10%.

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Heavy flavor conserved semi-leptonic decay of B in the covariant light-front approach

Shi,

Xing

2024

Nuclear Physics B

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Weak radiative decays of antitriplet bottomed baryons in light-front quark model

Cited by 13 publications

References 94 publications

Center of mass motion in bag model

Center of mass motion in bag model

Heavy quark symmetry in quark models

Heavy flavor conserved semi-leptonic decay of B in the covariant light-front approach

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