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FIZIKA B 13 (2004) 2, 565-576
 
CHROMODYNAMIC LENSING AND ^ SINGLE SPIN
ASYMMETRIES
M. BURKARDT
Department of Physics, New Mexico State University, Las Cruces, NM
88003, U.S.A.
Received 4 September 2003; Accepted 30 August 2004
Online 22 November 2004
The physical interpretation of generalized parton distributions (in the limit x = 0) as Fourier transforms of impact parameter dependent parton
distributions is discussed. Particular emphasis is put on the role of the target
polarization. For transversely polarized targets, we expect a significant deviation from
axial symmetry for the distribution in the transverse plane. We conjecture that this
transverse distortion, in combination with the final state, provides a natural explanation
for the sign of the Sivers contribution to semi-inclusive single-spin asymmetries.
PACS numbers: 12.38Lg 13.85Ni
UDC 539.12
Keywords: Sivers effect, generalized parton distributions
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