1212.6114 (Seung-il Nam)

Electroproduction of Lambda(1520) off the nucleon target with D_13(2150)    [PDF]

Seung-il Nam

We investigate the electroproduction of Lambda(1520) = Lambda* off the nucleon target, using the effective Lagrangian method at the tree-level Born approximation with the dominant nucleon-resonance contribution from D_13(2150). First, we compute the various physical quantities for the proton target case, such as the total and differential cross sections, t-momentum transfer distribution, and K- decay-angle (phi) distribution. It turns out that the D_13(2150) plays an important role to reproduce the electroproduction data correctly. The numerical results for the phi distribution shows obvious different structures from that for the photoproduction, due to the enhancement of the kaon exchange by the longitudinal polarization of the virtual photon as expected. Numerically, we observe that the kaon-exchange contribution in the t channel becomes about a half of that from the contact-term one that dominates the photoproduction of Lambda*. We also provide theoretical estimations for the Lambda* electroproduction off the neutron target, showing that its production rate is saturated almost by the resonance contribution. Finally, the contact-term dominance, which is the key ingredient for the Lambda* electromagnetic productions, is briefly discussed.

View original: http://arxiv.org/abs/1212.6114