Perturbative generation of a strange-quark asymmetry in the nucleon

被引：79

作者：

Catani, S ^{[1
]}

de Florian, D

Rodrigo, G

Vogelsang, W

机构：

[1] Univ Florence, Ist Nazl Fis Nucl, Sez Firenze, Dipartimento Fis, I-50019 Florence, Italy

[2] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Fis, RA-1428 Buenos Aires, DF, Argentina

[3] Inst Fis Corpuscular, E-46071 Valencia, Spain

[4] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA

[5] Brookhaven Natl Lab, RIKEN BNL Res Ctr, Upton, NY 11973 USA

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 93卷 / 15期

关键词：

D O I：

10.1103/PhysRevLett.93.152003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We point out that perturbative evolution in QCD at three loops generates a strange-antistrange asymmetry s(x)-(s) over bar (x) in the nucleon's sea just from the fact that the nucleon has nonvanishing up and down quark valence densities. The recently computed three-loop splitting functions allow for an estimate of this effect. We find that a fairly sizable asymmetry may be generated. Results for analogous asymmetries in the heavy-quark sector are also presented.

引用

页码：152003 / 1

页数：4

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