منابع مشابه
Bjorken Sum Rule at low Q 2
A description of the generalized Gerasimov-Drell-Hearn sum rules for proton and neutron is suggested, using their relation to the Bjorken sum rule. The results support an earlier conjecture, that the structure function gT features a smooth Q−dependence, while the structure function g2 is changing rapidly, due to the elastic contribution to the Burkhardt-Cottingham sum rule. A possible violation...
متن کاملHigher twist corrections to Bjorken sum rule
Some higher twist corrections to the Bjorken sum rule are estimated in the framework of a quark-diquark model of the nucleon. The parameters of the model have been previously fixed by fitting the measured higher twist corrections to the unpolarized structure function F2(x,Q ). The resulting corrections to the Bjorken sum rule turn out to be negligible. * Also at Physics Institute of the Univers...
متن کاملNeutron Spin Sum Rules and Spin Polarizabilities at Low Q2
izabilities have been formed. These proceedings will concentrate on recent measurments on the neutron via a polarized 3He target in the low Q2 region. In particular, experiment E97-110 was performed in Hall A to study the neutron and 3He spin structure at four-momentum transfers between 0.02 and 0.3 GeV2. This Q2 range allows us to make a benchmark-check of Chiral Perturbation Theory calculatio...
متن کاملTarget Mass Effects in QCD Bjorken Sum Rule
We investigate the target mass effects in QCD Bjorken sum rule. The magnitude of the target mass correction is estimated in a variety of methods employing positivity bound as well as the experimental data for the asymmetry parameters. It turns out that the target mass correction is sizable at low Q of the order of a few GeV, where the QCD correction is significant. We show that there exists unc...
متن کاملNeutron spin - dependent structure function , Bjorken sum rule , and first evidence for singlet contribution at low x
We perform the isospin decomposition of proton and neutron SLAC data for moderately low x in the region 0.01 ≤ x ≤ 0.1. The isovector part is well described by a power behaviour x, where α does not correspond to the intercept of single a1 Regge trajectory, as expected. However, the observed power leads to the validity of Bjorken sum rule and it is consistent with the power extracted from all pr...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 2002
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(02)02617-5