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Evidence for a backward peak in the gamma d -> pi(0)d cross section near the eta threshold
- Publication Year :
- 2010
- Publisher :
- SPRINGER, 233 SPRING ST, NEW YORK, NY 10013 USA, 2010.
-
Abstract
- High-quality cross sections for the reaction gamma+d->pi^0+d have been measured using the CLAS at Jefferson Lab over a wide energy range near and above the eta-meson photoproduction threshold. At backward c.m. angles for the outgoing pions, we observe a resonance-like structure near E_gamma=700 MeV. Our model analysis shows that it can be explained by eta excitation in the intermediate state. The effect is the result of the contribution of the N(1535)S_11 resonance to the amplitudes of the subprocesses occurring between the two nucleons and of a two-step process in which the excitation of an intermediate eta meson dominates.<br />Comment: slightly modified title, additional paragraph and a table (Table 2) added on p. 5; to be submitted to EPJA, 6 pages, 3 figures
- Subjects :
- Nuclear and High Energy Physics
D ELASTIC-SCATTERING
COHERENT PION-PHOTOPRODUCTION, D ELASTIC-SCATTERING, DIBARYON RESONANCES, NEAR-THRESHOLD, MESIC NUCLEUS, BOUND-STATES, DEUTERON, MESON, SIGNATURE, REGION
DIBARYON RESONANCES
Nuclear Theory
MESIC NUCLEUS
COHERENT PION-PHOTOPRODUCTION
Resonance (particle physics)
BOUND-STATES
REGION
Nuclear physics
Pion
Intermediate state
NEAR-THRESHOLD
Nuclear Experiment
Physics
Range (particle radiation)
Eta meson
SIGNATURE
DEUTERON
Amplitude
High Energy Physics::Experiment
MESON
Nucleon
Excitation
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....63565e84eecd913d9b56b642f11b4f0b