Exploring the polarization of gluons in the nucleon
نویسندگان
چکیده
We give an overview of the current status of investigations of the polarization of gluons in the nucleon. We describe some of the physics of the spin-dependent gluon parton distribution and its phenomenology in high-energy polarized hadronic scattering. We also review the recent experimental results. BNL-NT-07/12
منابع مشابه
اندازهگیری مشاهدهپذیرهای کانال تجزیه سهجسمی برای بخشی از فضای فاز پراکندگی دوترون- دوترون در انرژی برنوکلئون
Information obtained from nucleus as a bound system of nucleons and from nucleon-nucleon scattering experiments is a strong tool for studying various aspects of nuclear forces. Deuteron-deuteron scattering as a four-nucleon system can provide useful information. So, scattering experiment of a polarized beam of deuteron with kinetic energy of65 MeV/nucleon from a liquid-deuterium target was done...
متن کاملTransverse spin effects and higher twist in the singlet channel
The effects, originating from the longitudinal gluon polarization, are considered. We derive the analogue of the Wandzura-Wilczek relation for the light-cone distributions of polarized gluons in a transversely polarized nucleon. The short distance cross-section is entirely due to the intrinsic transverse momenta of gluon in the nucleon, in complete analogy to the quark case. Numerical estimate ...
متن کاملQCD Spin Physics: Partonic Spin Structure of the Nucleon
We discuss some recent developments concerning the nucleon’s helicity parton distribution functions: New preliminary data from jet production at RHIC suggest for the first time a non-vanishing polarization of gluons in the nucleon. SIDIS measurements at COMPASS provide better constraints on the strange and light sea quark helicity distributions. Single-longitudinal spin asymmetries in W -boson ...
متن کاملPolarized and Unpolarized Intrinsic Gluon Distributions
Theoretical constraints on both the polarized and unpolarized intrinsic gluorl distribution functions are developed. In pa.rticular, we study tllc beha\;ior of the gluon polarization aaymmetry in the nucleon in the sma.ll and la.rge s regiolls, a.ud relate the intrinsic distribution to the retarded part of the spin-depenclent I~ound-state potential. A simple model for the polarized and unpolari...
متن کاملGluon Polarization from QCD Sum Rules
The gluon polarization ∆G in a nucleon can be defined in a gauge invariant way as the integral over the Ioffe-time distribution of polarized gluons. We argue that for sufficiently regular polarized gluon distributions ∆G is dominated by contributions from small and moderate values of the Ioffe-time z ∼ 10. As a consequence ∆G can be estimated with 20% accuracy from the first two even moments of...
متن کامل