Revisiting semileptonic decays of 
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 supported by baryon spectroscopy

Li, Yushuai; Liu, Xiang; Yu, Fu-Sheng

doi:10.1103/physrevd.104.013005

Cited by 28 publications

(5 citation statements)

References 117 publications

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“…In two or three-body decays, T-odd observables can be constructed in the spin correlations among the particles [1][2][3][4][5][6][7][8][9][10]. Since the particle spins could not be directly measured in the current high energy physics experiments, we have to extract their effects through the angular distributions in the cascade decays [11][12][13][14][15][16][17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Time-reversal asymmetries and angular distributions in Λb → ΛV

Geng

Liu

2021

J. High Energ. Phys.

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We study the spin correlations to probe time-reversal (T) asymmetries in the decays of Λb→ ΛV (V = ϕ, ρ0, ω, K∗0). The eigenstates of the T-odd operators are obtained along with definite angular momenta. We obtain the T-odd spin correlations from the complex phases among the helicity amplitudes. We give the angular distributions of Λb→ Λ(→ pπ−)V (→ PP′) and show the corresponding spin correlations, where P(′) are the pseudoscalar mesons. Due to the helicity conservation of the s quark in Λ, we deduce that the polarization asymmetries of Λ are close to −1. Since the decay of Λb→ Λϕ in the standard model (SM) is dictated by the single weak phase from the product of CKM elements, $$ {V}_{tb}{V}_{ts}^{\ast } $$ V tb V ts ∗ , the true T and CP asymmetries are suppressed, providing a clean background to test the SM and search for new physics. In the factorization approach, as the helicity amplitudes in the SM share the same complex phase, T-violating effects are absent. Nonetheless, the experimental branching ratio of Br(Λb→ Λϕ) = (5.18 ± 1.29) × 10−6 suggests that the nonfactorizable effects or some new physics play an important role. By parametrizing the nonfactorizable contributions with the effective color number, we calculate the branching ratios and direct CP asymmetries. We also explore the possible T-violating effects from new physics.

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Section: Introductionmentioning

confidence: 99%

Time-reversal asymmetries and angular distributions in Λb → ΛV

Geng

Liu

2021

J. High Energ. Phys.

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“…It was shown that the quark-diquark picture works well for heavy baryons. Reference [81] worked in the triquark scheme, in which the three-body wave functions are based on the baryon spectroscopy. In addition, the relativistic quark model (RQM) [76], the covariant confined quark model (CCQM) [20], and the lattice QCD (LQCD) [77] also give similar predictions.…”

Section: Numerical Resultsmentioning

confidence: 99%

Nonleptonic two-body decays of $Λ_b\rightarrow Λ_c π, Λ_cK$ in the perturbative QCD approach

Zhang,

Li,

Jia

et al. 2022

Preprint

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We study the color-allowed Λ b → Λcπ, ΛcK decays in the perturbative QCD approach (PQCD) to lowest order in strong coupling constant αs. Both the factorizable and nonfactorizable contributions are taken into account in our calculations. It is found that these processes are dominated by the factorizable contributions, while the important nonfactorizable contributions can enhance the branching ratios by about 30%. The decay branching ratios are predicted to be B(Λ b → Λcπ) = 6.7 +8.9 −4.7 × 10 −3 and B(Λ b → ΛcK) = 5.0 +6.0 −4.0 × 10 −4 , where the uncertainties arise from the baryon light-cone distribution amplitudes (LCDAs), the heavy charm quark and charmed baryon masses, and the hard scales. It is shown that the asymmetry parameters in the two decays are approximately equal to -1, which is expected as in the heavy quark limit and the soft meson limit. Our predictions are consistent with the recent experimental data within errors. The obtained numerical results are also compared to those in the other theoretical approaches when they are available.

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“…It was the first observation of double heavy baryons. Later, the LHCb collaboration reported the new mass values of the state as MeV and MeV on different decay modes [3,4]. Such important observations undoubtedly promote the investigation on the hadron spectroscopy and also on the weak decays of double heavy baryons.…”

Section: Introductionmentioning

confidence: 93%

Static properties and semileptonic transitions of lowest-lying double heavy baryons*

Ghalenovi

Sorkhi

2023

Chinese Phys. C

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The static properties and semileptonic decays of ground-state doubly heavy baryons are studied working in the framework of a non-relativistic quark model. Using a phenomenological potential model, we calculate the ground-state masses and magnetic moments of doubly heavy $ \Omega $ and $ \Xi $ baryons. In the heavy quark limit, we introduce a simple form of the universal Isgur-Wise function used as the transition form factor and then investigate the exclusive $ b \rightarrow c $ semileptonic decay widths and branching fractions for $ \frac{1}{2}\rightarrow \frac{1}{2} $ baryon transitions. Our obtained results are in agreement with other theoretical predictions. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.

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Revisiting semileptonic decays of Λb(c) supported by baryon spectroscopy

Cited by 28 publications

References 117 publications

Time-reversal asymmetries and angular distributions in Λb → ΛV

Time-reversal asymmetries and angular distributions in Λb → ΛV

Nonleptonic two-body decays of $Λ_b\rightarrow Λ_c π, Λ_cK$ in the perturbative QCD approach

Static properties and semileptonic transitions of lowest-lying double heavy baryons*

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