arXiv:0709.3253·v1·High Energy Physics — Phenomenology
Are there approximate relations among transverse momentum dependent distribution functions?
H. Avakian🇺🇸 · A. V. Efremov🇷🇺 · K. Goeke🇩🇪 · A. Metz🇩🇪 · P. Schweitzer🇩🇪 · T. Teckentrup🇩🇪
Abstract
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.
Comments: 9 pages, 3 figures