Transverse-momentum-dependent fragmentation and quark distribution functions from the Nambu-Jona-Lasinio-jet model

被引：60

作者：

Matevosyan, Hrayr H. ^{[1
,2
]}

Bentz, Wolfgang ^{[3
]}

Cloet, Ian C. ^{[1
,2
,4
]}

Thomas, Anthony W. ^{[1
,2
]}

机构：

[1] Univ Adelaide, CSSM, Adelaide, SA 5005, Australia

[2] Univ Adelaide, ARC Ctr Excellence Particle Phys Tera Scale, Sch Chem & Phys, Adelaide, SA 5005, Australia

[3] Tokai Univ, Sch Sci, Dept Phys, Hiratsuka, Kanagawa 2591292, Japan

[4] Univ Washington, Dept Phys, Seattle, WA 98195 USA

来源：

PHYSICAL REVIEW D | 2012年 / 85卷 / 01期

基金：

澳大利亚研究理事会;

关键词：

DYNAMICAL MODEL; NJL MODEL; PION; ASYMMETRIES; SCATTERING; COLLINS; NUCLEON; ANALOGY; MESONS; LIGHT;

D O I：

10.1103/PhysRevD.85.014021

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using the model of Nambu and Jona-Lasinio to provide a microscopic description of both the structure of the nucleon and of the quark to hadron elementary fragmentation functions, we investigate the transverse-momentum dependence of the unpolarized quark distributions in the nucleon and of the quark to pion and kaon fragmentation functions. The transverse-momentum dependence of the fragmentation functions is determined within a Monte Carlo framework, with the notable result that the average P-perpendicular to(2) of the produced kaons is significantly larger than that of the pions. We also find that < P-perpendicular to(2)> has a sizable z dependence, in contrast with the naive Gaussian ansatz for the fragmentation functions. Diquark correlations in the nucleon give rise to a nontrivial flavor dependence in the unpolarized transversemomentum- dependent quark distribution functions. The < k(perpendicular to)(2)> Ti of the quarks in the nucleon are also found to have a sizable x dependence. Finally, these results are used as input to a Monte Carlo event generator for semi-inclusive deep inelastic scattering (SIDIS), which is used to determine the average transverse momentum squared of the produced hadrons measured in SIDIS, namely, < P-perpendicular to(2)>. Again, we find that the average P-perpendicular to(2) of the produced kaons in SIDIS is significantly larger than that of the pions and in each case < P-perpendicular to(2)> Ti has a sizable z dependence.

引用

页数：13

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