منابع مشابه
GLUON CONTRIBUTION TO THE TRANSVERSE SPIN STRUCTURE FUNCTION g2
We consider the twist-3 gluon contribution to the transverse spin structure function g2.We find that the Burkhardt-Cottingham sum rule is satisfied. The additional nonlocal operators appear in the moments of g2 which were absent in previous analysis of Bukhvostov, Kuraev and Lipatov.
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We study the structure function gT = g1+g2, using the factorisation method. It turns out that gT has a much simpler operator structure as compared to g2, in spite of the fact that, like g2, gT has a twist-three component not suppressed by powers of Q . We demonstrate factorisation of the hadronic tensor into hard and soft parts for the case of gT , even though g2 does not admit of such a demons...
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where s is the particle’s spin, sz its third component, and an irrelevant phase has been omitted. An important point, with far-reaching consequences, is that T maps “in” states into “out” states: T : |in〉 → |out〉. In what follows, we shall discuss the rôle that TR plays in the transverse spin structure of hadrons . Before entering into the subject, it is worth recalling that the implementation ...
متن کاملSpin Structure of the Proton and Transverse Momentum Dependent distributions
Transverse Momentum Dependent Distributions (TMDs) describe the spin structure of the proton. At leading twist spin structure of spin-1/2 hadron can be described by 8 TMDs. TMDs reveal three-dimensional distribution of partons inside polarised nucleon. Experimentally these functions can be studied in polarised experiments using Spin Asymmetries in particular Single Spin Asymmetries (SSAs). We d...
متن کاملTransverse spin structure of the nucleon from lattice-QCD simulations.
We present the first calculation in lattice QCD of the lowest two moments of transverse spin densities of quarks in the nucleon. They encode correlations between quark spin and orbital angular momentum. Our dynamical simulations are based on two flavors of clover-improved Wilson fermions and Wilson gluons. We find significant contributions from certain quark helicity flip generalized parton dis...
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ژورنال
عنوان ژورنال: ISRN High Energy Physics
سال: 2013
ISSN: 2090-7427
DOI: 10.1155/2013/519842