  We show that a new beam-spin asymmetry appears in deep inelastic inclusive
lepto-production at low transverse momenta when a hadron in the target
fragmentation region is observed in association with another hadron in the
current fragmentation region. The beam leptons are longitudinally polarized
while the target nucleons are unpolarized. This asymmetry is a leading-twist
effect generated by the correlation between the transverse momentum of quarks
and the transverse momentum of the hadron emitted by the target. Experimental
signatures of this effect are discussed.
