Near-threshold photoproduction of $Λ(1520)$ from protons and deuterons

Details Near-threshold photoproduction of $Λ(1520)$ from protons and deuterons Near-threshold photoproduction of $Λ(1520)$ from protons and deuterons

2009-04-14

arxiv.org/abs/0904.2034v2

Phys.Rev.Lett.103:012001,2009

Physics

Nuclear Physics

Nuclear Experiment

5 pages and 4 figures. One reference added

Scientific paper

10.1103/PhysRevLett.103.012001

Photoproduction of $\Lambda$(1520) with liquid hydrogen and deuterium targets was examined at photon energies below 2.4 GeV in the SPring-8 LEPS experiment. For the first time, the differential cross sections were measured at low energies and with a deuterium target. A large asymmetry of the production cross sections from protons and neutrons was observed at backward K$^{+/0}$ angles. This suggests the importance of the contact term, which coexists with t-channel K exchange under gauge invariance. This interpretation was compatible with the differential cross sections, decay asymmetry, and photon beam asymmetry measured in the production from protons at forward K$^+$ angles.

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