Role of the ρ meson in the description of pion electroproduction experiments

Amand Faessler, Thomas Gutsche, Valery E. Lyubovitskij, Igor T. Obukhovsky

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We study the p(e,e'π+)n reaction in the framework of an effective Lagrangian approach including nucleon, π and ρ meson degrees of freedom and show the importance of the ρ-meson t-pole contribution to σT, the transverse part of cross section. We test two different field representations of the ρ meson, vector and tensor, and find that the tensor representation of the ρ meson is more reliable in the description of the existing data. In particular, we show that the ρ-meson t-pole contribution, including the interference with an effective nonlocal contact term, sufficiently improves the description of the recent JLab data at invariant mass W 2.2 GeV and Q2 2.5 GeV2/c2. A "soft" variant of the strong πNN and ρNN form factors is also found to be compatible with these data. On the basis of the successful description of both the σL and σT parts of the cross section we discuss the importance of taking into account the σT data when extracting the charge pion form factor Fπ from σL.

Original languageEnglish
Article number025213
JournalPhysical Review C - Nuclear Physics
Volume76
Issue number2
DOIs
Publication statusPublished - 31 Aug 2007
Externally publishedYes

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pions
mesons
form factors
poles
tensors
cross sections
vector mesons
degrees of freedom
interference

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics

Cite this

Role of the ρ meson in the description of pion electroproduction experiments. / Faessler, Amand; Gutsche, Thomas; Lyubovitskij, Valery E.; Obukhovsky, Igor T.

In: Physical Review C - Nuclear Physics, Vol. 76, No. 2, 025213, 31.08.2007.

Research output: Contribution to journalArticle

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