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Beam Spin Asymmetry in Semi-Inclusive Electroproduction of Hadron Pairs
A first measurement of the longitudinal beam spin asymmetry ${A}_{LU}$ in the semi-inclusive electroproduction of pairs of charged pions is reported. ${A}_{LU}$ is a higher-twist observable and offers the cleanest access to the nucleon twist-3 parton distribution function $e(x)$. Data have been collected in the Hall-B at Jefferson Lab by …