Parton intrinsic motion:: Suppression of the Collins mechanism for transverse single spin asymmetries in p↑p→πX -: art. no. 014002

被引：75

作者：

Anselmino, M

Boglione, M

D'Alesio, U

Leader, E

Murgia, F

机构：

[1] Univ Turin, Dipartimento Fis Teor, I-10125 Turin, Italy

[2] Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy

[3] Ist Nazl Fis Nucl, Sez Cagliari, I-09042 Monserrato, CA, Italy

[4] Univ Cagliari, Dipartimento Fis, I-09042 Monserrato, CA, Italy

[5] Univ London Imperial Coll Sci Technol & Med, London SW7 2BW, England

来源：

PHYSICAL REVIEW D | 2005年 / 71卷 / 01期

关键词：

D O I：

10.1103/PhysRevD.71.014002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We consider a general formalism to compute inclusive polarized and unpolarized cross sections within pQCD and the factorization scheme, taking into account parton intrinsic motion in distribution and fragmentation functions, as well as in the elementary dynamics. Surprisingly, the intrinsic partonic motion, with all the correct azimuthal angular dependences, produces a strong suppression of the transverse single spin asymmetry arising from the Collins mechanism. As a consequence, and in contradiction with earlier claims, the Collins mechanism is unable to explain the large asymmetries found in p(up arrow)p-->piX at moderate to large Feynman x(F). The Sivers effect is not suppressed.

引用

页码：014002 / 1

页数：11

共 47 条

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