Nucleon transition form factors at JLab: status and outlook
The measurements of exclusive single-meson and double-pion electro-production cross sections off the proton to study nucleon resonances will be extended to higher momentum transfers with the CLAS12 detector and the energy upgraded CEBAF beam. Based on new theoretical developments to extract and interpret the electromagnetic transition form factors and on the experience gained from the most recent results, the newly formed collaboration of experimentalists and theorists shall enable us to provide unprecedented high-precision data, high-quality analyses, and state-of-the-art model and QCD based calculations in a Q~2 domain up to 10 GeV~2. For the first time nucleon resonance structures will be studied at still unexplored distance scales, where the dressed quark contributions are the dominating degrees of freedom and their strong interaction is responsible for the ground and excited nucleon state formation. These studies also open up a promising opportunity to understand the origin of more than 98% of the nucleon mass that is created by strong fields predominantly at these distance scales by dressing the current quarks.
baryon structure strong degrees of freedom
R.W.Gothe
University of South Carolina,Columbia,SC 29208,USA
国际会议
The 12th International Workshop on the Physics of Ezcited Nucleon NSTAR2009(2009激发态核子物理研讨会)
北京
英文
1216-1221
2009-04-19（万方平台首次上网日期，不代表论文的发表时间）