The role of Δ(1700) excitation and ρ production in double pion photoproduction

✍ Scribed by J.C. Nacher; E. Oset; M.J. Vicente Vacas; L. Roca

• Book ID: 104334899
• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 537 KB
• Volume: 695
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(01)01110-1

✦ Synopsis

Recent information on invariant mass distributions of the γp → π + π 0 n reaction, where previous theoretical models had shown deficiencies, have made more evident the need for new mechanisms, so far neglected or inaccurately included. We have updated a previous model to include new necessary mechanisms. We find that the production of the ρ meson, and the ∆(1700) excitation, through interference with the dominant terms, are important mechanisms that solve the puzzle of the γp → π + π 0 n reaction without spoiling the early agreement with the γp → π + π -p and γp → π 0 π 0 p reactions.