2005/06/16 by V. Yu. Grishina, L. A. Kondratyuk, L.A. Kondratyuk +3 · 12 citations
Physics and Astronomy · #Baryon #Elementary particle #Hadron #High-Energy Particle Collisions Research #Hyperon #Nuclear physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Phenomenology (philosophy) #Photon #Physics #Pion #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #Universality (dynamical systems) #nucl-th
paper · pdf · doi:10.1140/epja/i2005-10081-7
published in The European Physical Journal A 25(1), 141-150 (Springer Science+Business Media) · 11 pages, 13 figures; accepted for publication in Eur. Phys. J. A
arxiv created 2005/06/16 · openalex publication_date 2005/07/01 · openalex created_date 2016/06/24 · arxiv updated 2020/05/20 · openalex updated_date 2026/08/05
Using the Quark-Gluon Strings Model -- combined with Regge phenomenology -- we perform a comparative analysis of Λ, Σ0, Λ(1520) and Θ+ production in binary reactions induced by photon, pion and proton beams on the nucleon. We find that the existing experimental data on the γp → K+ Λ differential and total cross sections can be described very well by the model for photon energies 1 - 16 GeV and -t < 2 GeV2 assuming a dominant contribution of the K^* Regge trajectory. Moreover, using the same parameters we also reproduce the total γp → K+ Σ0 and γp → K+ Λ(1520) cross sections suggesting a 'universality' of the Regge model. In order to check the consistency of the approach we evaluate the differential and total cross sections for the reaction π- p → K0 Λ which is also found to be dominated by the K^* Regge trajectory. Using the apparent 'universality' of the Regge model we extend our scheme to the analysis of the binary reactions γp → K0 Θ+, π- p → K- Θ+ and pp → Σ+ Θ+ as well as the exclusive and inclusive Θ+ production in the reactions pp → p K0 Θ+ and pp → Θ+ X. Our detailed studies demonstrate that Θ+ production does not follow the 'universality' principle thus suggesting an essentially different internal structure of the exotic baryon relative to conventional hyperons or hyperon resonances.