QCD sum rules analysis of weak decays of doubly heavy baryons: the $$b\rightarrow c$$ processes

Xing, Z.; Zhao, Zhen-Xing

doi:10.1140/epjc/s10052-021-09902-2

Cited by 12 publications

(2 citation statements)

References 64 publications

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“…Meanwhile many properties of doubly heavy spectroscopy have been investigated in theory, such as the hadron spectrum [12][13][14][15][16], the "decay constant" or the so-called pole residue [17], and so on [18][19][20]. Focusing on the weak decays of doubly heavy baryons, there have been intense explorations ranging from the flavor SU(3) symmetry analyses [21] to the model-dependent determinations of form factors and decay widths [22][23][24][25][26][27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Light quark decays of doubly heavy baryons in light front approach

2023

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We explore the semileptonic and nonleptonic decays of doubly heavy baryons $$(\Omega _{cc}^{(*)+},\Omega _{bb}^{(*)0},\Omega _{bc}^{(*)-},\Omega _{bc}^{\prime 0})$$ ( Ω cc ( ∗ ) + , Ω bb ( ∗ ) 0 , Ω bc ( ∗ ) - , Ω bc ′ 0 ) induced by the $$s\rightarrow u$$ s → u transition. Hadronic form factors are parametrized by transition matrix elements and are calculated in the light front quark model. With the form factors, we make use of helicity amplitudes and analyze semileptonic and nonleptonic decay modes of doubly heavy baryons. Benchmark results for partial decay widths, branching fractions, forward–backward asymmetries and other phenomenological observables are derived. We find that typical branching fractions for semileptonic decays into $$\ell \bar{\nu }$$ ℓ ν ¯ are at the order $$10^{-7}-10^{-8}$$ 10 - 7 - 10 - 8 and the ones for nonleptonic decays are at the order $$10^{-5}$$ 10 - 5 , which are likely detectable such as in LHCb experiment. With the potential data accumulated in future, our results may help to shape our understanding of the decay mechanism in the presence of two heavy quarks.

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Section: Introductionmentioning

confidence: 99%

Light quark decays of doubly heavy baryons in light front approach

2023

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“…Theoretically, the Ξ ++ cc decay properties have been studied extensively by e.g. [9][10][11][12][13][14][15]. Experimental efforts have also been put into searching for the flavor SU(3) partners of Ξ ++ cc [16,17], but none of them has been discovered yet.…”

Section: Introductionmentioning

confidence: 99%

Inclusive weak-annihilation decays and lifetimes of beauty-charmed baryons

Yang¹,

Liang²,

Qin³

et al. 2022

Preprint

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Imbalanced beauty-charmed baryons Ξ +,0 bc are of great significance to the development of heavy flavor physics. In this work, we study the inclusive weak-annihilation decays of Ξ +,0 bc and their contributions to the Ξ +,0 bc lifetimes. For the calculation of the inclusive Ξ +,0 bc → Xcs decay width where Xcs stands for the sum of the final states with charm number +1 and strange number -1, we work in the heavy diquark effective theory which provides us with a convenient technical tool to construct the operator product expansion. The Ξ +,0 bc is considered to be a superposition of two states with one containing a spin-0 bc diquark and the other one containing a spin-1 bc diquark. It is found that both the Ξ +,0 bc lifetimes and the Ξ +,0 bc → Xcs branching ratios are very sensitive to the bc spin in Ξ +,0 bc . As Ξ + bc has a longer lifetime than Ξ 0 bc and bigger branching ratios of similar decay channels, the exclusive decays Ξ + bc → D * + (→ D 0 π + )K − p and Ξ + bc → D 0 K * 0 (→ K − π + )p are more promising for experimental searches of Ξ +,0 bc at the LHC comparing with exclusive decay Ξ 0 bc → D 0 pK − .

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Hyperon semileptonic decays in QCD sum rules

Zhang,

Qiao

2024

J. High Energ. Phys.

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We investigate the hyperon semileptonic decays within the framework of QCD sum rules. The flavor SU(3) symmetry breaking effects are analyzed via the relevant form factors and corresponding branching fractions. Employing the z-series parameterization to capture the q2 dependence of form factors, we calculate the hyperon semileptonic decay rates and confront them with the recent experimental measurements. Moreover, we calculate as well the non-standard tensor form factors, which involve certain new physics beyond the standard model.

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QCD sum rules analysis of weak decays of doubly heavy baryons: the $$b\rightarrow c$$ processes

Cited by 12 publications

References 64 publications

Light quark decays of doubly heavy baryons in light front approach

Light quark decays of doubly heavy baryons in light front approach

Inclusive weak-annihilation decays and lifetimes of beauty-charmed baryons

Hyperon semileptonic decays in QCD sum rules

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