HIGHER-TWIST EFFECTS IN THE REACTION PI-N-]MU+MU-X AT 253GEV/C

被引:65
作者
HEINRICH, JG
BIINO, C
GREENHALGH, JF
LOUIS, WC
MCDONALD, KT
PALESTINI, S
RUSSELL, DP
SHOEMAKER, FC
SMITH, AJS
ADOLPHSEN, CE
ALEXANDER, JP
ANDERSON, KJ
CONWAY, JS
PILCHER, JE
POSSOZ, A
ROSENBERG, EI
机构
[1] UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637
[2] IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011
来源
PHYSICAL REVIEW D | 1991年 / 44卷 / 07期
关键词
D O I
10.1103/PhysRevD.44.1909
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The distributions of quarks in the pion and nucleon are extracted from measurements of the reaction pi- N --> mu+mu- X at 253 GeV/c in a naive Drell-Yan analysis, as well as QCD-corrected analyses at leading-log and next-to-leading-log order. As x-pi --> 1 the pion structure function shows a term that varies as 1/m-mu-mu-4, which we interpret as a higher-twist effect. Additionally, the angular distribution of the mu+ in the muon-pair rest frame tends towards sin2-theta as x-pi --> 1 and as m-mu-mu --> 0 in a manner consistent with higher-twist effects. When the strongly mass-dependent higher-twist effects are included as part of the pion structure function, the nucleon structure function agrees well with leading-twist results from deeply inelastic lepton-hadron scattering. A significant advance of the present work is the extension of the analysis to low masses by the subtraction of the J/psi and psi' resonances from the continuum. Our analysis covers the kinematic range 0.4 < x-pi < 1.0 and 0.02 < x(N) < 0.33 with 3.0 < m-mu-mu < 8.55 GeV/c2. Cross sections for psi' production are presented in an appendix.
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页码:1909 / 1932
页数:24
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