Higher order light-cone distribution amplitudes of the Lambda baryon

Liu, Yong-Lu; Cui, Chun-Yu; Huang, Ming-Qiu

doi:10.1140/epjc/s10052-014-3041-x

Cited by 12 publications

(12 citation statements)

References 58 publications

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“…where the obtained interval of s 0 is in agreement with that adopted in [2,24]. The coupling f (2) Λ b (µ 0 ) will be taken from the NLO HQET sum rule calculation [51] …”

Section: Jhep02(2016)179supporting

confidence: 59%

“…A closely related approach was applied to construct the LCSR for Λ b → Λ form factors at tree level from the vacuum-to-Λ-baryon correlation function [23] where the Λ-baryon DA entering the sum rules were only considered at the leading conformal spin accuracy (the non-asymptotic corrections were worked out in [24] now) and the Chernyak-Zhitnitsky [25] type of the Λ-baryon interpolating current was used (see [26,27] for alternative choices and [28] for interesting comments on the choices of the baryonic interpolating currents). Another approach to compute the Λ b → Λ form factors based upon the transverse-momentum-dependent (TMD) factorization was carried out in [29] where the soft overlap contribution was assumed to be suppressed by the Sudakov factor and only the hard spectator interactions induced by twohard-collinear-gluon exchanges are taken into account.…”

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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“…where the obtained interval of s 0 is in agreement with that adopted in [2,24]. The coupling f (2) Λ b (µ 0 ) will be taken from the NLO HQET sum rule calculation [51] …”

Section: Jhep02(2016)179supporting

confidence: 59%

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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“…Since the beginning of this century, many efforts have been devoted to the study of the light-cone distribution amplitudes of the nucleon [17][18][19] and the strange octet baryons [20][21][22]. The reader is referred to the paper [23] for a detailed overview.…”

Section: +021mentioning

confidence: 99%

Analysis of the semileptonic decay ${{\rm{\Lambda }}}_{c} \rightarrow {{ne}}^{+}{\nu }_{e}$

Liu

et al. 2017

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

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The semileptonic weak decay process of the Λ c baryon to the neutron Λ c → ne + ν e is examined. The transition form factors are investigated with light-cone QCD sum rules. The differential decay width is obtained in the dynamical region by fitting the sum rules-allowed results with the dipole formula. The total decay width and the branching ratio are estimated to be Γ(Λ c → ne + ν e ) = (8.89 ± 0.36) × 10 −15 GeV and Br(Λ c → ne + ν e ) = 0.27 ± 0.01%, respectively.

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“…Describing the baryon octet simultaneously we are able to unify and systemize the efforts made in refs. [5][6][7][8]33]. An important insight to be gained from our results is of qualitative nature: in the chiral odd sector the chiral behaviour (i.e.…”

Section: Discussionmentioning

confidence: 85%

“…[6] Due to some misprints, obvious errors and inconsistencies within refs. [7,8,33] we are not able to give reliable matching formulas for their definitions.…”

Section: B Handbook Of Distribution Amplitudesmentioning

confidence: 95%

Model-independent calculation of SU(3) f violation in baryon octet light-cone distribution amplitudes

Wein

Schäfer

2015

J. High Energ. Phys.

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In this work we present a minimal parametrization of the light-cone distribution amplitudes of the baryon octet including higher twist contributions. Simultaneously we obtain the quark mass dependence of the amplitudes at leading one-loop accuracy by the use of three-flavor baryon chiral perturbation theory (BChPT), which automatically yields model-independent results for the leading SU(3) flavor breaking effects. For that purpose we have constructed the nonlocal light-cone three-quark operators in terms of baryon octet and meson fields and have carried out a next-to-leading order BChPT calculation. We were able to find a minimal set of distribution amplitudes (DAs) that do not mix under chiral extrapolation towards the physical point and naturally embed the Λ baryon. Additionally they are chosen in such a way that all DAs of a certain symmetry class have a similar quark mass dependence (independent of the twist of the corresponding amplitude), which allows for a compact presentation. The results are well-suited for the extrapolation of lattice data and for model building.

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Higher order light-cone distribution amplitudes of the Lambda baryon

Cited by 12 publications

References 58 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

Analysis of the semileptonic decay ${{\rm{\Lambda }}}_{c} \rightarrow {{ne}}^{+}{\nu }_{e}$

Model-independent calculation of SU(3) f violation in baryon octet light-cone distribution amplitudes

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