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Transverse structure function in the factorisation method

Prakash Mathews·V. Ravindran·Sridhar K
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Abstract

Deep Inelastic scattering experiments using transversely polarised targets yield information on the structure function $g_2$. By means of a free-field analysis, we study the operator structure of $g_2$ and demonstrate the need for retaining the twist three mass terms in order to maintain current-conservation. We show that the structure function $g_T=g_1+g_2$ has a much simpler operator structure as compared to $g_2$, in spite of the fact that, like $g_2$, $g_T$ has a twist-three component. We demonstrate factorisation of the hadronic tensor into hard and soft parts for the case of $g_T$. We show that the first moment of the gluonic contribution to $g_T$ vanishes, and discuss possible physical applications.

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Prakash Mathews, V. Ravindran, Sridhar K. 1996-08-08. Transverse structure function in the factorisation method. https://arxiv.org/abs/hep-ph/9607385

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