Journal Article FZJ-2021-02106

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Beam Spin Asymmetry in Semi-Inclusive Electroproduction of Hadron Pairs

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2021
APS College Park, Md.

Physical review letters 126(6), 062002 () [10.1103/PhysRevLett.126.062002]

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Abstract: 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.

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Contributing Institute(s):
  1. Experimentelle Hadronstruktur (IKP-1)
Research Program(s):
  1. 612 - Cosmic Matter in the Laboratory (POF4-612) (POF4-612)
  2. 6G12 - FAIR (GSI) (POF4-6G12) (POF4-6G12)

Appears in the scientific report 2021
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Medline ; Creative Commons Attribution CC BY 4.0 ; SCOAP3 OpenAccess ; OpenAccess ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; NationallizenzNationallizenz ; SCOAP3 sponsored Journal ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection
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 Record created 2021-05-10, last modified 2021-06-23


OpenAccess:
2010.09544 - Download fulltext PDF
PhysRevLett.126.062002 - Download fulltext PDF
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