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

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 $$ mathcal{o}left({alpha}_sright) $$ 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 ℓ + ℓ − 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.