Document Type
Article
Abstract
A first measurement of the longitudinal beam spin asymmetry π΄πΏβ’π in the semi-inclusive electroproduction of pairs of charged pions is reported. π΄πΏβ’π is a higher-twist observable and offers the cleanest access to the nucleon twist-3 parton distribution function πβ‘(π₯). 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 π΄sinβ‘ππ LU moments are extracted for the kinematic variables of interest in the valence quark region. The understanding of dihadron production is essential for the interpretation of observables in single-hadron production in semi-inclusive DIS, and pioneering measurements of single-spin asymmetries in dihadron production open a new avenue in studies of QCD dynamics.
Digital Object Identifier (DOI)
Publication Info
Published in Physical Review Letters, Volume 126, Issue 6, 2021.
Rights
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published articleβs title, journal citation, and DOI.
APA Citation
M. Mirazita, Avakian, H., A. Courtoy, Pisano, S., Adhikari, S., M.J. Amaryan, Angelini, G., H. Atac, Baltzell, N. A., L. Barion, M. Battaglieri, I. Bedlinskiy, F. Benmokhtar, Bianconi, A., A.S. Biselli, F. BossΓΉ, S. Boiarinov, Briscoe, W. J., Brooks, W. K., & D. Bulumulla. (2021). Beam Spin Asymmetry in Semi-Inclusive Electroproduction of Hadron Pairs. Physical Review Letters, 126(6). https://doi.org/10.1103/physrevlett.126.062002