Beauty baryon decays: a theoretical overview

Wang, Yuming

doi:10.1088/1742-6596/556/1/012050

Cited by 3 publications

(3 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…refs. [94][95][96][97]. Here we study the twobody non-leptonic Λ b → Λ + c L − decays, for which the factorization assumption is believed to be reliable [37,[98][99][100][101].…”

Section: Predictions For λmentioning

confidence: 99%

Two-body non-leptonic heavy-to-heavy decays at NNLO in QCD factorization

Huber

Kränkl

2016

J. High Energ. Phys.

109

View full text Add to dashboard Cite

We evaluate in the framework of QCD factorization the two-loop vertex corrections to the decaysB (s) where L is a light meson from the set {π, ρ, K ( * ) , a 1 }. These decays are paradigms of the QCD factorization approach since only the colour-allowed tree amplitude contributes at leading power. Hence they are sensitive to the size of power corrections once their leading-power perturbative expansion is under control. Here we compute the two-loop O(α 2 s ) correction to the leading-power hard scattering kernels, and give the results for the convoluted kernels almost completely analytically. Our newly computed contribution amounts to a positive shift of the magnitude of the tree amplitude by ∼ 2%. We then perform an extensive phenomenological analysis to NNLO in QCD factorization, using the most recent values for non-perturbative input parameters. Given the fact that the NNLO perturbative correction and updated values for form factors increase the theory prediction for branching ratios, while experimental central values have at the same time decreased, we reanalyze the role and potential size of power corrections by means of appropriately chosen ratios of decay channels.

show abstract

“…refs. [94][95][96][97]. Here we study the twobody non-leptonic Λ b → Λ + c L − decays, for which the factorization assumption is believed to be reliable [37,[98][99][100][101].…”

Section: Predictions For λmentioning

confidence: 99%

Two-body non-leptonic heavy-to-heavy decays at NNLO in QCD factorization

Huber

Kränkl

2016

J. High Energ. Phys.

109

View full text Add to dashboard Cite

show abstract

“…The crossed circles indicate possible insertions of the virtual photon line and the black squares stand for the hadronic operator vertices. Taken from [66].…”

Section: Jhep02(2016)179mentioning

confidence: 99%

Perturbative corrections to Λ b → Λ form factors from QCD light-cone sum rules

Wang

Shen

2016

J. High Energ. Phys.

Self Cite

View full text Add to dashboard Cite

We compute radiative corrections to Λ b → Λ from factors, at next-to-leading logarithmic accuracy, from QCD light-cone sum rules with Λ b -baryon distribution amplitudes. Employing the diagrammatic approach factorization of the vacuum-to-Λ b -baryon correlation function is justified at leading power in Λ/m b , with the aid of the method of regions. Hard functions entering the factorization formulae are identical to the corresponding matching coefficients of heavy-to-light currents from QCD onto soft-collinear effective theory. The universal jet function from integrating out the hard-collinear fluctuations exhibits richer structures compared with the one involved in the factorization expressions of the vacuum-to-B-meson correlation function. Based upon the QCD resummation improved sum rules we observe that the perturbative corrections at O(α s ) shift the Λ b → Λ from factors at large recoil significantly and the dominant contribution originates from the next-to-leading order jet function instead of the hard coefficient functions. Having at hand the sum rule predictions for the Λ b → Λ from factors we further investigate several decay observables in the electro-weak penguin Λ b → Λ + − transitions in the factorization limit (i.e., ignoring the "non-factorizable" hadronic effects which cannot be expressed in terms of the Λ b → Λ from factors), including the invariant mass distribution of the lepton pair, the forward-backward asymmetry in the dilepton system and the longitudinal polarization fraction of the leptonic sector.

show abstract

“…3. These figures are taken from Table 2 The same as Table 1, but for LQSR-2 [16]). For calculations of these contributions some nonperturbative approaches are needed (More details about the non-factorizable effects, see [15]).…”

Section: Introductionmentioning

confidence: 99%

Study of the $$\Lambda _{b} \rightarrow N^*\ell ^+ \ell ^- $$ decay in light cone sum rules

2019

View full text Add to dashboard Cite

The form factors of the b → N * + − decay are calculated in the framework of the light cone QCD sum rules. In the calculations the contribution of the negative parity * b baryon is eliminated by constructing the sum rules for different Lorentz structures. Furthermore the branching ratio of the semileptonic b → N * + − decay is calculated. The numerical study for the branching ratio of the b → N * + − decay indicates that it is quite large and could be measurable at future planned experiments to be conducted at LHCb.

show abstract

Beauty baryon decays: a theoretical overview

Cited by 3 publications

References 22 publications

Two-body non-leptonic heavy-to-heavy decays at NNLO in QCD factorization

Two-body non-leptonic heavy-to-heavy decays at NNLO in QCD factorization

Perturbative corrections to Λ b → Λ form factors from QCD light-cone sum rules

Study of the $$\Lambda _{b} \rightarrow N^*\ell ^+ \ell ^- $$ decay in light cone sum rules

Contact Info

Product

Resources

About