The Nucleon Resonance Structure from the π+π-p Electroproduction Reaction off Protons

被引：10
作者：
Burkert, V. D. [1 ]
Mokeev, V. I. [1 ]
Ishkhanov, B. S. [2 ]
机构：
[1] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA
[2] Moscow MV Lomonosov State Univ, Skobeltsyn Inst Nucl Phys, Moscow 119899, Russia
来源：
MOSCOW UNIVERSITY PHYSICS BULLETIN | 2019年 / 74卷 / 03期
关键词：
excited nucleon state structure; photo; and electroexcitation amplitudes; strong QCD; GAMMA;
D O I：
10.3103/S0027134919030032
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The data on photo- and electroexcitation amplitudes of most nucleon resonances in the mass range up to 2.0 GeV determined from the CLAS experiments on exclusive pi(+)pi(-)p photo-electroproduction off protons in collaboration between the Jefferson Lab and Moscow State University are presented. The first (and, currently, the only available) data on electroexcitation amplitudes from CLAS in a wide range of photon virtualities Q(2) <5.0 GeV2 reveal the nucleon resonance structure as a complex interplay between the inner core of three dressed quarks and an external meson-baryon cloud. These results shed light on the strong QCD dynamics, which underlies the generation of excited nucleon states with different structural features from confined quarks and gluons. The future prospects of these studies in the new era of experiments with the CLAS 12 detector, which began in the spring of 2018, are outlined.
引用
收藏
页码：243 / 255
页数：13
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