Nuclear-medium modification of the ρ0(1S) and ρ′(2S) mesons in coherent photo-and electroproduction: Coupled-channel analysis View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2000-08

AUTHORS

N. N. Nikolaev, J. Speth, B. G. Zakharov

ABSTRACT

We study medium modifications of the dilepton e+e− and μ+μ− mass spectra in coherent photo-and electroproduction of ρ0(1S)-and ρ′(2S)-meson resonances on nuclear targets. The analysis is performed within the coupled ρ0(1S), ρ′(2S), ... channel formalism, where nuclear modifications derive from off-diagonal rescatterings. We find that the effect of off-diagonal rescatterings on the shape of the dilepton-mass spectrum in the ρ0(1S)-meson mass region is only marginal, but it is very important in the ρ′(2S) mass region. The main off-diagonal contribution in the ρ′(2S) mass region comes from the sequential mechanism γ* → ρ0(1S) → ρ′(2S), which dominates ρ′(2S) production for heavy nuclei. Our results also show that, in the ρ′(2S) mass region, there is a considerable interference of the Breit-Wigner tail of the amplitude for the decay ρ0(1S) to e+e− and μ+μ− with the amplitude for the decay of ρ′(2S) to e+e− and μ+μ−. More... »

PAGES

1463-1476

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/1.1307468

DOI

http://dx.doi.org/10.1134/1.1307468

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1045406453


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