GLUON FORM-FACTOR OF THE PROTON FROM QCD SUM-RULES

被引:45
作者
BRAUN, VM
GORNICKI, P
MANKIEWICZ, L
SCHAFER, A
机构
[1] CTR PHYS THEORET,PL-02668 WARSAW,POLAND
[2] NICOLAUS COPERNICUS ASTRON CTR,PL-00716 WARSAW,POLAND
[3] UNIV FRANKFURT,INST THEORET PHYS,W-6000 FRANKFURT,GERMANY
[4] MAX PLANCK INST NUCL PHYS,W-6900 HEIDELBERG 1,GERMANY
关键词
D O I
10.1016/0370-2693(93)90399-3
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We discuss the possibility to estimate hadronic matrix elements of gluonic operators in the framework of the QCD sum rule approach and consider in detail the particular example of the gluon form factor of the proton, normalized at Q2=0 to the fraction of the proton momentum carried by gluons. To this end we evaluate the proton coupling to a suitable quark-quark-quark-gluon current and calculate the three-point correlation function of a pair of such currents and the traceless part of the gluonic contribution to the energy-momentum tensor. We obtain a rather slow Q2-dependence of this form factor. which corresponds to the radius of the gluon distribution R congruent-to 0.3-0.35 fm and is much smaller than the electromagnetic radius.
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页码:291 / 298
页数:8
相关论文
共 30 条
[1]   NONLOCAL CONDENSATES AND QCD SUM-RULES FOR THE PION FORM-FACTOR [J].
BAKULEV, AP ;
RADYUSHKIN, AV .
PHYSICS LETTERS B, 1991, 271 (1-2) :223-230
[2]   ON THE VIRTUAL GAMMA-GAMMA-ANNIHILATION TO HADRONS [J].
BALITSKY, II .
PHYSICS LETTERS B, 1982, 114 (01) :53-57
[3]   EXOTIC MESONS WITH JPC =1-+ FROM QCD SUM-RULES [J].
BALITSKY, II ;
DYAKONOV, DI ;
YUNG, AV .
PHYSICS LETTERS B, 1982, 112 (01) :71-74
[4]  
BELYAEV VM, 1982, ZH EKSP TEOR FIZ+, V83, P876
[5]   THE 2ND MOMENTS OF QUARK AND GLUON DISTRIBUTION-FUNCTIONS IN NUCLEON [J].
BELYAEV, VM ;
BLOK, BY .
ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS, 1986, 30 (02) :279-286
[6]  
Bigi I., 1991, Soviet Physics - JETP, V73, P198
[7]  
BRAUN VM, 1986, SOV J NUCL PHYS+, V44, P489
[8]  
BRAUN VM, 1982, SOV J NUCL PHYS+, V35, P731
[9]  
BRAUN VM, 1985, SOV J NUCL PHYS, V41, P405
[10]   ASYMPTOTIC-BEHAVIOR OF EXCLUSIVE PROCESSES IN QCD [J].
CHERNYAK, VL ;
ZHITNITSKY, AR .
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 1984, 112 (3-4) :173-318