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

Khodjamirian, Alexander; Klein, Carlos Henrique; Mannel, Th.; Wang, Y.-M.

doi:10.1007/jhep09(2011)106

Cited by 135 publications

(154 citation statements)

References 44 publications

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“…where we have defined Note also that we have naively assumed that effects from the negative-party baryons with J P = 1/2 − can be absorbed into the dispersion integrals in the above expressions and we refer to [31] for a detailed discussion of eliminating the "contamination" from such background contributions in the context of the LCSR with the nucleon DA.…”

Section: Jhep02(2016)179mentioning

confidence: 99%

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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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Section: Jhep02(2016)179mentioning

confidence: 99%

“…Employing the prediction of f + Λ b →p (0) from the LCSR with the nucleon DA [31] and the result of f Λ /f N computed from QCD sum rules [34] yields f + Λ b →Λ (0) = 0.18 ± 0.04. Proceeding with the above-mentioned matching procedure we then find…”

Section: Predictions For the λ B → λ Form Factorsmentioning

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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“…where the coupling constants of Λ c pD and Λ c pD * interactions are taken as g ΛcpD = 10.7 +5.3 −4.3 and g ΛcpD * = −5.8 +2.1 −2.5 [38,43]. The couplings of Y Λ cΛc and Y pp can be obtained from their partial decay widths.…”

Section: Formalism and Ingredientsmentioning

confidence: 99%

Role ofY(4630)in thepp¯→<

et al. 2016

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We investigate the charmed baryon production reaction pp → ΛcΛc in an effective Lagrangian approach. Besides the t-channel D 0 and D * 0 mesons exchanges, the s-channel Y (4630) meson exchange is taken into account. For the total cross sections, the D 0 and D * 0 mesons provide minor background contributions, while the Y (4630) state gives a clear peak structure with the magnitude of 10 µb at center of mass energy 4.63 GeV. Basing on the results, we suggest that the reaction of pp → ΛcΛc can be used to search for the 1 −− charmonium-like Y (4630) state, and our predictions can be tested in future by thePANDA facility.

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“…The corresponding light-cone distribution amplitudes are defined as non-local matrix elements of light-ray operators with a rather intuitive Wilson-link structure. Light-cone distribution amplitudes also serve as non-perturbative inputs in the factorization formulas of correlation functions, which are used to construct QCD light-cone sum rules for heavy-to-light transition form factors [12][13][14] and for hadron strong couplings [15,16].…”

Section: Introductionmentioning

confidence: 99%

Non-dipolar Wilson links for transverse-momentum-dependent wave functions

Wang

2015

J. High Energ. Phys.

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Abstract:We propose a new definition of a transverse-momentum-dependent (TMD) wave function with simpler soft subtraction for k T factorization of hard exclusive processes. The un-subtracted wave function involves two pieces of non-light-like Wilson links oriented in different directions, so that the rapidity singularity appearing in usual k T factorization is regularized, and the pinched singularity from Wilson-link self-energy corrections is alleviated to a logarithmic one. In particular no soft function is needed, when the two pieces of Wilson links are orthogonal to each other. We show explicitly at one-loop level that the simpler definition with the non-dipolar Wilson links exhibits the same infrared behavior as the one with the dipolar Wilson links and complicated soft subtraction. It is pointed out that both definitions reduce to the naive TMD wave function as the non-light-like Wilson links approach to the light cone. Their equivalence is then extended to all orders by considering the evolution in the Wilson-link rapidity.

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

Cited by 135 publications

References 44 publications

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

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

Role ofY(4630)in thepp¯→<

Non-dipolar Wilson links for transverse-momentum-dependent wave functions

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