Abstract
A coupled channel model for the interaction of vector mesons with baryons is employed in the study of the γp → K0Σ+ reaction around the K*Λ and K*Σ thresholds, where the recent CBELSA/TAPS cross section shows a sudden drop and the differential cross section experiences a transition from a forward-peaked distribution to a flat one. A delicate interference between amplitudes having K*Λ and K*Σ intermediate states is found. The sharp downfall is dictated by the presence of a N* resonance produced by our model, a feature that we have employed to infer its properties. Predictions for the complementary γn → K0Σ0 reaction are also given.
Highlights
The use of effective Lagrangians combined with unitarizing techniques has proven to be a very efficient tool to understand a variety of problems in hadron physics
In this work we show that the explicit consideration of vector mesons and their unitarized interaction with baryons are crucial ingredients to understand the behavior of the γp → K0Σ+ cross section around 2000 MeV
2000 MeV, which incorporates the interaction between vector mesons with baryons, obtained from local hidden gauge Lagrangians and implementing unitarization in coupled channels
Summary
The use of effective Lagrangians combined with unitarizing techniques has proven to be a very efficient tool to understand a variety of problems in hadron physics. The description of baryon production reactions covering the region of energy around 2 GeV, requires an extension of these models to incorporate the interaction of vector mesons with baryons. A powerful tool is provided by the hidden gauge formalism,[8,9,10] applied recently to generate resonances as vector-baryon quasibound states[11,12] and allowing the simultaneous coupling to pseudoscalarbaryon states.[13,14] Alternatively, one may employ flavour-spin SU(6) symmetric models.[15,16]. The same fate is shown to follow for the models,[22,23,24] as discussed in.[19] In this work we show that the explicit consideration of vector mesons and their unitarized interaction with baryons are crucial ingredients to understand the behavior of the γp → K0Σ+ cross section around 2000 MeV
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