Abstract
Preliminary measurements of the differential cross sections of the γn → K*(892)0Λ and γn → K+Σ*(1385)- reactions are shown using data from the Jefferson Lab Hall B CLAS g13 experiment. No experimental cross section data have yet been published on the γn → K*(892)0Λ reaction, and the only published cross section data on the γn → K+Σ*(1385)- reaction are at forward angles, where t-channel K+ and K*+ exchanges are predicted to dominate. These data can be used to contribute to the search for the "missing" N* resonances, some of which are predicted to have non-negligible couplings to the excited strangeness channels.
Highlights
About a dozen N ∗ states have been well-established according to the Particle Data Group,[1] but some relativized quark models[2] predict that many more N ∗ resonances exist
The preliminary differential cross section of the γn → K∗(892)0Λ reaction from the CLAS g13 experiment is shown in Figure 1 compared against the model prediction by Oh and Kim.[8]
It was later found that this γp → K∗(892)+Λ preliminary total cross section was low by a factor of 1.5 due to a scaling error,[10] and the model predictions have not yet been updated to take this into account
Summary
About a dozen N ∗ states have been well-established according to the Particle Data Group,[1] but some relativized quark models[2] predict that many more N ∗ resonances exist. Measurements of the cross sections and polarization observables of strangeness photoproduction reactions on the proton and the neutron can provide additional constraints on the extraction of the N ∗ resonance parameters, which will provide valuable information on the relevant degrees of freedom within the nucleon.
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