Q(2)-dependence of the Gerasimov-Drell-Hearn sum rule
Ma WX(马维兴); Ma, WX; Li, XG; Lu, DH; Thomas, AW
刊名HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION
1999
卷号23期号:9页码:880-889
关键词GDH sun rule photon absorption cross sections baryon resonance
学科分类Physics
通讯作者Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China ; Natl Lab Heavy Ion Collis, Ctr Theoret Nucl Phys, Lanzhou 730000, Peoples R China ; Univ Adelaide, Dept Phys & Math Phys, Adelaide, SA 5005, Australia ; Univ Adelaide, Special Res Ctr Subatom Struct Matter, Adelaide, SA 5005, Australia ; Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China
文章类型Article
英文摘要We test the Gerasimov-Drell-Hearn (GDH) sum rule numerically by calculating the total photon absorption cross sections sigma(1/2) and sigma(3/2) on the nucleon via photon excitation of baryon resonances in the constituent quark model. A total of seventeen, low-lying, non-strange baryon resonances are included in this calculation. The transverse and longitudinal interference cross section, sigma(1/2)(TL), is found to play an important role in the study of the Q(2) variation of the sum rule. The results show that the GDH sum rule is saturated by these resonances at a confidence level of 94%. In particular, the P-33(1232) excitation largely saturates the sum rule at Q(2) = 0, and dominates at small Q(2). The GDH integral has a strong Q(2)-dependence below Q(2) = 1.0GeV(2) and changes its sign around Q(2) = 0.3GeV(2). It becomes weakly Q2-dependence for Q(2) > 1.0GeV(2) because of the quick decline of resonance contributions.
类目[WOS]Physics, Nuclear ; Physics, Particles & Fields
研究领域[WOS]Physics
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语种英语
WOS记录号WOS:000083108500007
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/238669
专题中国科学院高能物理研究所_理论物理室_期刊论文
作者单位中国科学院高能物理研究所
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GB/T 7714
Ma WX,Ma, WX,Li, XG,et al. Q(2)-dependence of the Gerasimov-Drell-Hearn sum rule[J]. HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION,1999,23(9):880-889.
APA 马维兴,Ma, WX,Li, XG,Lu, DH,&Thomas, AW.(1999).Q(2)-dependence of the Gerasimov-Drell-Hearn sum rule.HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION,23(9),880-889.
MLA 马维兴,et al."Q(2)-dependence of the Gerasimov-Drell-Hearn sum rule".HIGH ENERGY PHYSICS AND NUCLEAR PHYSICS-CHINESE EDITION 23.9(1999):880-889.
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