Electroproduction of Neutral Pions at Energies Above the Resonance Region
TL;DR: In this article, the reaction e p→e'p π 0 has been measured at W = 2.55 GeV a fixed electron scattering angle of 10.3°.
About: This article is published in Physics Letters B.The article was published on 1975-09-29 and is currently open access. It has received 12 citations till now. The article focuses on the topics: Hodoscope & Resonance (particle physics).
Summary (1 min read)
do.L
- Thus their measurements represent an upper limit to da.
- The lead glass hodoscope was wade of a central.
3 em
- It seems difficult to reconcile the present data with a weak absorption model where the dip is caused by a wrong signature nonsense zero.
- A strong absorption or dual absorption model might be able to fit the data.
Did you find this useful? Give us your feedback
Citations
More filters
TL;DR: In this article, the π+ production is dominated by longitudinally polarized photons and can be described by one pion exchange at small |t| and at low |t | the transverse (π+¯¯¯¯n) cross section drops steeply withQ petertodd2, but remains roughly constant forQ�2≧0.5 GeV2.
Abstract: 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.
100 citations
TL;DR: In this article, the coupling between the Regge pole model and the data at the real photon point at large virtuality Q 2 has been investigated and a natural explanation of the surprisingly large cross section of the neutral pion electroproduction recently measured at Jefferson Laboratory has been provided.
23 citations
TL;DR: In this article, the Pomeron trajectories of families of mesons have been studied in the non-perturbative regime, where the players in the game are current quarks and massless gluons.
14 citations
TL;DR: A general review of the theory and phenomenology of exchange mechanisms in hadronic reactions at all energies above the resonance region is presented in this paper, where the main emphasis is on examining how far fairly simple theoretical ideas can be taken in obtaining a general understanding of high energy two-body reactions.
Abstract: A general review of the theory and phenomenology of exchange mechanisms in hadronic reactions at all energies above the resonance region is presented. The main emphasis is on examining how far fairly simple theoretical ideas can be taken in obtaining a general understanding of high energy two-body reactions.
12 citations
TL;DR: In this paper, the authors proposed to build on an european basis a new 15-30 GeV electron facility: ELFE (Electron Laboratory For Europe) to understand the inner structure of nucleons and nuclei.
11 citations
References
More filters
TL;DR: In this paper, the first order ealculations in the electromagnetic coupling constant alpha = (e/sup 2/4 pi ) = (1/137) were used to compute the photon nuclear reaction gamma + A - B + C.
Abstract: Electron inelastic scattering by nucleons or nuclei in the process e/sup -/ + A -- e/sup -/ + B + C is related to the photonuclear reaction gamma + A - B + C by using first-order ealculations in the electromagnetic coupling constant alpha = (e/sup 2//4 pi ) = (1/137). (L.N.N.)
62 citations
TL;DR: In this article, the "radius" of a virtual spacelike photon has been predicted to change with its mass, while keeping all other parameters fixed, and to see whether the dips move.
Abstract: Dips in differential cross sections of inelastic hadronic reactions may be caused by nonsense zeros or by geometrical effects. A direct way of resolving this question is to change the interaction radius in a reaction, while keeping all other parameters fixed, and to see whether the dips move. The "radius" of a virtual spacelike photon has been predicted to change with its mass. If this is verified (e.g., in ${\ensuremath{\rho}}^{0}$ electroproduction), a study of the dip in ${\ensuremath{\pi}}^{0}$ electroproduction should decide between the two schools of dip mechanisms.
20 citations