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What can break the Wandzura-Wilczek relation?

Alberto Accardia,b, Alessandro Bacchettaa,c, W. Melnitchouka and Marc Schlegela

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We analyze the breaking of the Wandzura-Wilczek relation for the g2 structure function, emphasizing its connection with transverse momentum dependent parton distribution functions. We find that the relation is broken by two distinct twist-3 terms, and clarify how these can be separated in measurements of double-spin asymmetries in semi-inclusive deep inelastic scattering. Through a quantitative analysis of available g2 data we also show that the breaking of the Wandzura-Wilczek relation can be as large as 15–40% of the size of g2.

Keywords

Parton Model

Deep Inelastic Scattering

QCD

 

E-print Number: 0907.2942

Cited: by |

Refers: to

PACS

13.60.Hb Total and inclusive cross sections (including deep-inelastic processes)

12.38.Bx Perturbative calculations

13.40.Gp Electromagnetic form factors

Subjects

Particle physics and field theory

Dates

Issue 11 (November 2009)

Received 3 August 2009, accepted for publication 12 October 2009

Published 20 November 2009



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