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A first measurement of the longitudinal beam spin asymmetry ALU in thesemi-inclusive electroproduction of pairs of charged pions is reported. ALU isa higher-twist observable and offers the cleanest access to the nucleon twist-3parton distribution function e(x). Data have been collected in the Hall-B atJefferson Lab by impinging a 5.498 GeV electron beam on a liquid-hydrogentarget, and reconstructing the scattered electron and the pion pair with theCLAS detector. One-dimensional projections of the sin(phiR) moments of ALU areextracted for the kinematic variables of interest in the valence quark region.The understanding of di-hadron production is essential for the interpretationof observables in single hadron production in semi-inclusive DIS, andpioneering measurements of single spin asymmetries in di-hadron production opena new avenue in studies of QCD dynamics.

Beam spin asymmetry in semi-inclusive electroproduction of a hadron pair