Electroproduction of ?+ n, ?- p andK + ?,K + 2211; 0 final states above the resonance region

Autor: P. Brauel, H. Krehbiel, R. Felst, D. Cords, W.-D. Kollmann, G. Grindhammer, M. Helm, T. Canzler, M. Schädlich
Rok vydání: 1979
Předmět:
Zdroj: Zeitschrift f�r Physik C Particles and Fields. 3:101-123
ISSN: 1434-6052
0170-9739
DOI: 10.1007/bf01443698
Popis: The reactionsΣ v p→π+ n,K + Λ,K + ∑ 0 andΣ v n→π+ n were studied at invariant hadronic masses around 2.2. GeV forQ 2=0.06, 0.28, 0.70, and 1.35 GeV2. The main results are: At small |t| the π+ production is dominated by longitudinally polarized photons and can be described by one pion exchange. At low |t| the transverse (π+ n) cross section drops steeply withQ 2, but remains roughly constant forQ 2≧0.5 GeV2. For |t⊢≧0.8 GeV2, (π+ n/dt) is almost independent ofQ 2. The integrated cross section (π+ n) shows a similarQ 2-dependence asσ tot (γ v p) forQ 2≧0.28 GeV2. The ratioσ(π- p)/σ(π+ n) atQ 2=0.70 and 1.35 GeV2 for |t|≧0.6 GeV2 is smaller than in photoproduction and close to 1/4. The ratioσ(K + ∑ 0 decreases steeply withQ 2 following roughly the predictions of the quark-parton model.
Databáze: OpenAIRE
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