Are there approximate relations among transverse momentum dependent distribution functions?

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Certain exact relations among transverse momentum dependent parton distribution functions due to QCD equations of motion turn into approximate ones upon the neglect of pure twist-3 terms. On the basis of available data from HERMES we test the practical usefulness of one such ``Wandzura-Wilczek-type approximation'', namely of that connecting h_{1L}^{\perp(1)a}(x) to h_L^a(x), and discuss how it can be further tested by future CLAS and COMPASS data.
9 pages, 3 figures

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High Energy Physics - Phenomenology

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http://salesiana.dossiersoluciones.com/handle/123456789/193687

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0709.3253
 http://arxiv.org/abs/0709.3253
 Phys.Rev.D77:014023,2008
 doi:10.1103/PhysRevD.77.014023

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arXiv