Journal of East China Normal University(Natural Science) >

2015 , Vol. 2015 >Issue 1: 195 - 202

DOI: https://doi.org/10.3969/j.issn.1000-5641.2015.01.024

Article

Research on parton distributions in nucleon

  • XU Shi-Lei ,
  • RUAN Jian-Hong
Expand
  • Department of Physics, East China Normal University, Shanghai 200241, China

Received date: 2014-04-01

  Online published: 2015-03-29

Fold

Abstract

We present the parton distributions at leading order (LO) coming from GJR, MSTW and CTEQ parton sets and compare them at different momentum scales. Obvious differences exist in their gluon and sea quark distributions at small x region. Itindicates that people have not known the nucleon parton distributions very well. We analysze the influence of higher twist effects, i.e., the shadowing effects and anti-shadowing effects, on parton distributions. Because of the shadowing effects, the twist-4 gluon and sea quark distributions are smaller than the twist-2 distributions at small and middle x region, while, the anti-shadowing effects make the twist-4 gluon and sea quark distributions larger than the twist-2 distributions at x & 2 region. Finally, we present a detailed analysis of how the proton’s momentum is shared among various parton flavors at different Q2 for different parton sets. With the numerical calculation, we show that the MD-DGLAP equations are momentum conservation.

Key words： parton distributions; higher twist effect; evolution equation

Cite this article

XU Shi-Lei , RUAN Jian-Hong . Research on parton distributions in nucleon[J]. Journal of East China Normal University(Natural Science), 2015 , 2015(1) : 195 -202 . DOI: 10.3969/j.issn.1000-5641.2015.01.024

References

MARTIN A D, STIRLING W J, THORNE R S, et al. Parton distributions for the LHC [J]. European Physical Journal C, 2009 (63): 189-285.
PUMPLIN J, STUMP D R, HUSTON J, et al. New generation of parton distributions with uncertainties from global QCD analysis [J]. Journal of High Energy Physics, 2002, 07(012): 1-47.
GLUCK M, JIMENEZ-DELGADO P, REYA E. Dynamical parton distributions of the nucleon and very small-x physics [J]. European Physical Journal C, 2008(53): 355-366.
GRIBOV L V, LEVIN E M, RYSKIN M G. Semihard processes in QCD [J]. Physics Reports, 1983(100): 1-150.
MULLER A H, QIU J W. Gluon recombination and shadowing at small values of x [J]. Nuclear Physics B, 1986(268): 427-452.
ZHU W. A new approach to parton recombination in the evolution equations [J]. Nuclear Physics B, 1999(551): 245-274.
ZHU W, RUAN J H. A new modified Altarelli-Parisi evolution equation with parton recombination in proton [J]. Nuclear Physics B, 1999(559): 378-392.
RUAN J H, ZHU W. Prediction for unintegrated parton distributions [J]. Physical Review C, 2009, 80(045209): 1-13.
杨东岩, 阮建红. 扭度-4效应对核子极化结构函数的影响~[J]. 华东师范大学学报: 自然科学版, 2009, 01:128-136
ZHU W, RUAN J H, YANG J F, et al. Contributions of gluon recombination to saturation phenomena [J]. Physical Review D, 2003, 68(094015): 1-11.
Options
Outlines

/

〈 〉