Meson production in hadron- and photon-induced reactions

F Huang,K Nakayama,J Haidenbauer,Ulf-G Meißner,M Döring,D Rönchen,S Krewald,H Haberzettl,C Hanhart,A Wrońska,R Skibiński,St Kistryn,H Ströher,C Guaraldo

doi:10.1051/epjconf/20123701022

Abstract

The meson production and associated excited-baryon-analysis program by the Julich-Athens/GA-Washington/DC Collaboration is presented. The program’s analysis is based on a dynamical coupled-channels approach developed by the Collaboration [1-4], where the basic symmetries, such as the two-body unitarity, analyticity, and gauge invariance are respected. In particular, gauge invariance is enforced as dictated by the generalized Ward-Takahashi identity. In the hadronic reactions sector, the πN , ηN , KΛ , and K∑ channels are included, in addition to the effective ππN channels σN , ρN , and πΔ . Energies up to √s = 2 GeV are considered. In the photon-induced reactions sector, the neutral and charged pion photoproduction processes are considered up to √s = 1.65 GeV so far [4]. These are currently being extended to higher energies including the ηN , KΛ , and K∑ channels.

Highlights

In this contribution, we report on the results of the latest resonance analysis in hadron- and photoninduced reactions by the Julich-Athens/GA-Washington/DC collaboration [1]
Gauge invariance is enforced as dictated by the generalized Ward-Takahashi identity
The analysis is based on a dynamical coupled-channels (DCC) approach employing the phenomenological effective Lagrangians of the latest extension of the Julich hadronic model [2]

Summary

Introduction

We report on the results of the latest resonance analysis in hadron- and photoninduced reactions by the Julich-Athens/GA-Washington/DC collaboration [1]. The analysis is based on a dynamical coupled-channels (DCC) approach employing the phenomenological effective Lagrangians of the latest extension of the Julich hadronic model [2]. It includes the channels πN, ηN, KΛ and KΣ, as well as the three effective ππN channels π∆, σN and ρN. The current effort is the first step towards a global analysis of pion- and photon-induced production of πN, ηN, KΛ and KΣ within our DCC approach This will allow us, in particular, to address the photoproduction data of unprecedented accuracy that have been measured recently at ELSA, MAMI, JLab and elsewhere for the KY final states.

Pion-induced reactions

Photon-induced reactions

Some basic open issues

Outlook