Baryon sum rules and chiral symmetry breaking

Chung, Y. S.; Dosch, H. G.; Kremer, Michael; Schall, Daniel

doi:10.1016/0550-3213(82)90154-7

Cited by 249 publications

(205 citation statements)

References 14 publications

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“…The discussion of the optimal choice of the baryon interpolating current goes back to the early papers [10,24,25]. In the Λ c -baryon, the isospin of the light diquark [ud] is zero, excluding the structures γ µ and σ µν for Γ b in the η current.…”

Section: Correlation Function and Interpolating Currentsmentioning

confidence: 99%

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Form factors and strong couplings of heavy baryons from QCD light-cone sum rules

Khodjamirian

Klein

Mannel

et al. 2011

J. High Energ. Phys.

135

136

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We derive QCD light-cone sum rules for the hadronic matrix elements of the heavy baryon transitions to nucleon. In the correlation functions the Λ c , Σ c and Λ b -baryons are interpolated by three-quark currents and the nucleon distribution amplitudes are used. To eliminate the contributions of negative parity heavy baryons, we combine the sum rules obtained from different kinematical structures. The results are then less sensitive to the choice of the interpolating current. We predict the Λ b → p form factor and calculate the widths of the Λ b → pℓν l and Λ b → pπ decays. Furthermore, we consider double dispersion relations for the same correlation functions and derive the light-cone sum rules for the Λ c N D ( * ) and Σ c N D ( * ) strong couplings. Their predicted values can be used in the models of charm production in pp collisions.

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Section: Correlation Function and Interpolating Currentsmentioning

confidence: 99%

“…One advantage of this current is that the power corrections terms are small. On the other hand, the tensor current provides a reduced continuum contributions, at least in the sum rules with light baryons [25].…”

Section: Correlation Function and Interpolating Currentsmentioning

confidence: 99%

Form factors and strong couplings of heavy baryons from QCD light-cone sum rules

Khodjamirian

Klein

Mannel

et al. 2011

J. High Energ. Phys.

135

136

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“…We will therefore only consider the axialvector current j A Λ for construction of the correlation function, and more detailed discussions on the choices of the baryonic currents can be found in [28,32,33].…”

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.

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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.

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“…It has been noticed that the current interpolating the baryon state is not unique early almost at the beginning when the QCD sum rules were used to the baryon [1,2]. There were many works devoted to this issue [3,4,5,6], particularly for the investigation on the electromagnetic form factors of the nucleon [7,8], which have shown that the choice of the interpolating current may affect the result to some extent.…”

Section: Introductionmentioning

confidence: 99%

A light-cone QCD sum rule approach for the Ξ baryon electromagnetic form factors and the semileptonic decay Ξ_c→ Ξe⁺ν_e

Liu¹,

Huang²

2010

J. Phys. G: Nucl. Part. Phys.

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Light-cone QCD sum rule approach for the Ξ baryon electromagnetic form factors and the semileptonic decay Ξ c → Ξe + ν e process is expected to be Γ(Ξ c → Ξe + ν e ) = (6.17 +2.24 −2.48 ) × 10 −14 GeV. The results make sure that the adoption of this type interpolating current improve the calculations of the magnetic form factors and give more reliable prediction for the analysis of the semileptonic decay process.

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Baryon sum rules and chiral symmetry breaking

Cited by 249 publications

References 14 publications

Form factors and strong couplings of heavy baryons from QCD light-cone sum rules

Form factors and strong couplings of heavy baryons from QCD light-cone sum rules

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

A light-cone QCD sum rule approach for the Ξ baryon electromagnetic form factors and the semileptonic decay Ξ_c→ Ξe⁺ν_e

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Baryon sum rules and chiral symmetry breaking

Cited by 249 publications

References 14 publications

Form factors and strong couplings of heavy baryons from QCD light-cone sum rules

Form factors and strong couplings of heavy baryons from QCD light-cone sum rules

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

A light-cone QCD sum rule approach for the Ξ baryon electromagnetic form factors and the semileptonic decay Ξc→ Ξe+νe

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Product

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A light-cone QCD sum rule approach for the Ξ baryon electromagnetic form factors and the semileptonic decay Ξ_c→ Ξe⁺ν_e