Distribution amplitudes of $Σ$ and $Λ$ and their electromagnetic form factors

Details Distribution amplitudes of $Σ$ and $Λ$ and their electromagnetic form factors Distribution amplitudes of $Σ$ and $Λ$ and their electromagnetic form factors

2008-11-12

arxiv.org/abs/0811.1812v2

Nucl.Phys.A821:80-105, 2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

40 pages, 19 figures

Scientific paper

10.1016/j.nuclphysa.2009.02.003

Based on QCD conformal partial wave expansion to leading order conformal spin accuracy, we present the light-cone distribution amplitudes (DAs) of $\Sigma$ and $\Lambda$ baryons up to twist 6. It is concluded that fourteen ndependent DAs are needed to describe the valence three-quark states of the baryons at small transverse separations. The nonperturbative parameters relevant to the DAs are determined within the framework of QCD sum rule method. With the obtained DAs, a simple investigation on the electromagnetic form factors of these baryons are given. The magnetic moments of the baryons are estimated by fitting the magnetic form factor with the dipole formula.

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