Notes

(1) For this result, we take the fragments of the target to lie along the direction, and two produced partons to have equal and opposite transverse momenta .

(2) The contribution from longitudinal photons is typically less than 0.1%. The projection selects the cross-section combination .

(3) This form is reasonable for low momentum fragments since the rapidity plateau associated with the fragmentation of the "diquark" left after a quark in the proton has been ejected by the , should be similar to that for a quark. In addition, at high momenta, the fragmentation model of ref. [5] should also roughly describe diquark fragmentation, except that in the latter case, the leading particle is an rather than a . However, the type of the final hadrons is not important for our analysis.

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