Comment on "Proton Spin Structure from Measurable Parton Distributions" by Ji, Xiong and Yuan (PRL109, 152005 (2012))

C\'edric Lorc\'e; Elliot Leader

arxiv: 1211.4731 · v1 · pith:UGEBRO5Tnew · submitted 2012-11-20 · ✦ hep-ph · nucl-th

Comment on "Proton Spin Structure from Measurable Parton Distributions" by Ji, Xiong and Yuan (PRL109, 152005 (2012))

Elliot Leader , C\'edric Lorc\'e This is my paper

classification ✦ hep-ph nucl-th

keywords distributionspartonangularclaimcommentexpressiongeneralizedincorrect

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We show that the recent claim that the expression 1/2 \int x dx [ H_q (x,0,0) + E_q(x,0,0)], involving the generalized parton distributions H and E, measures the transverse angular momentum of quarks in a transversely polarized nucleon, is incorrect.

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