Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-09-20
JHEP 0702:029,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
v2: includes explicit definitions of polarized cross sections + minor corrections; to appear in JHEP
Scientific paper
10.1088/1126-6708/2007/02/029
The gauge-links connecting the parton field operators in the hadronic matrix elements appearing in the transverse momentum dependent distribution functions give rise to T-odd effects. Due to the process-dependence of the gauge-links the T-odd distribution functions appear with different pre-factors. A consequence is that in the description of single spin asymmetries the parton distribution and fragmentation functions are convoluted with gluonic pole cross sections rather than the basic partonic cross sections. In this paper we calculate the gluonic pole cross sections encountered in single spin asymmetries in hadron-hadron scattering. The case of back-to-back pion production in polarized proton-proton scattering is worked out explicitly. It is shown how T-odd gluon distribution functions originating from gluonic pole matrix elements appear in twofold.
Bomhof C. J.
Mulders Piet J.
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