This title appears in the Scientific Report :
2021
Please use the identifier:
http://hdl.handle.net/2128/27770 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevLett.126.062002 in citations.
Beam Spin Asymmetry in Semi-Inclusive Electroproduction of Hadron Pairs
Beam Spin Asymmetry in Semi-Inclusive Electroproduction of Hadron Pairs
A first measurement of the longitudinal beam spin asymmetry ALU in the semi-inclusive electroproduction of pairs of charged pions is reported. ALU 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 Hal...
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Please use the identifier: http://dx.doi.org/10.1103/PhysRevLett.126.062002 in citations.
A first measurement of the longitudinal beam spin asymmetry ALU in the semi-inclusive electroproduction of pairs of charged pions is reported. ALU 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 impinging a 5.498 GeV electron beam on a liquid-hydrogen target, and reconstructing the scattered electron and the pion pair with the CLAS detector. One-dimensional projections of the sin(phiR) moments of ALU are extracted for the kinematic variables of interest in the valence quark region. The understanding of di-hadron production is essential for the interpretation of observables in single hadron production in semi-inclusive DIS, and pioneering measurements of single spin asymmetries in di-hadron production open a new avenue in studies of QCD dynamics. |