Possible violation of sum rules for higher-twist parton distributions

被引:22
作者
Burkardt, M [1 ]
机构
[1] UNIV WASHINGTON,INST NUCL THEORY,SEATTLE,WA 98195
来源
PHYSICAL REVIEW D | 1995年 / 52卷 / 07期
关键词
D O I
10.1103/PhysRevD.52.3841
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Precise measurements of polarized electroproduction and Drell-Yan processes in the deep inelastic limit will soon provide the first information on the higher-twist parton distributions g(T)(x) and h(L) (a:). Sum rules for higher-twist structure functions are only valid provided the corresponding Compton amplitudes satisfy unsubtracted dispersion relations. Subtracted dispersion relations have to be used when the (real part of the) forward scattering amplitudes do not fall off rapidly enough for nu --> infinity (fixed Q(2)). Formally, such subtractions lead to delta functions at the origin in the parton distributions, which are not accessible to experiment, and the integral over the data fails to satisfy the sum rule. The delta functions in the parton distributions can be identified with the zero modes that appear in light-front quantization. An explicit infinite momentum boost identifies these soft quark modes with low momentum contributions arising from self-energy-type interactions.
引用
收藏
页码:3841 / 3852
页数:12
相关论文
共 53 条
[41]   PERTURBATIVE RENORMALIZATION OF NULL-PLANE QED [J].
MUSTAKI, D ;
PINSKY, S ;
SHIGEMITSU, J ;
WILSON, K .
PHYSICAL REVIEW D, 1991, 43 (10) :3411-3427
[42]  
MUTA T, 1987, F QCD
[43]   SPONTANEOUS SYMMETRY-BREAKING OF (1+1)-DIMENSIONAL PHI-4 THEORY IN LIGHT-FRONT FIELD-THEORY .2. [J].
PINSKY, SS ;
VANDESANDE, B .
PHYSICAL REVIEW D, 1994, 49 (04) :2001-2013
[44]  
PINSKY SS, 1993, PHYS REV D, V48, P816
[45]   PRODUCTION OF DIMUONS FROM HIGH-ENERGY POLARIZED PROTON-PROTON COLLISIONS [J].
RALSTON, JP ;
SOPER, DE .
NUCLEAR PHYSICS B, 1979, 152 (01) :109-124
[46]   SPONTANEOUS SYMMETRY-BREAKING IN DISCRETIZED LIGHT-CONE FIELD-THEORY [J].
ROBERTSON, DG .
PHYSICAL REVIEW D, 1993, 47 (06) :2549-2553
[47]  
ROBERTSON DG, 1992, Z PHYS C, V53, P679
[48]   DYNAMIC SYMMETRY-BREAKING IN 4-FERMION INTERACTION MODELS [J].
ROSENSTEIN, B ;
WARR, BJ ;
PARK, SH .
PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 1991, 205 (02) :59-108
[49]   POLARIZED ELECTROPRODUCTION IN ASYMPTOTICALLY FREE GAUGE THEORIES [J].
SASAKI, K .
PROGRESS OF THEORETICAL PHYSICS, 1975, 54 (06) :1816-1827
[50]  
TANGERMAN RD, HEPPH9408305 REP