Beam Spin Asymmetry in Semi-Inclusive Electroproduction of Hadron Pairs

DOI

10.1103/PhysRevLett.126.062002

Authors

• M Mirazita, INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy.
• H Avakian, Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
• A Courtoy, Instituto de Física, Universidad Nacional Autónoma de México Apartado Postal 20-364, Ciudad de México 01000, Mexico.
• S Pisano, Centro Fermi-Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, 00184 Rome, Italy.
• S Adhikari, Florida International University, Miami, Florida 33199, USA.
• M J. Amaryan, Old Dominion University, Norfolk, Virginia 23529, USA.
• Giovanni Angelini, The George Washington University, Washington, D.C. 20052, USA.
• H Atac, Temple University, Philadelphia, Pennsylvania 19122, USA.
• N A. Baltzell, Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
• L Barion, INFN, Sezione di Ferrara, 44100 Ferrara, Italy.
• M Battaglieri, INFN, Sezione di Genova, 16146 Genova, Italy.
• I Bedlinskiy, National Research Centre Kurchatov Institute-ITEP, Moscow 117259, Russia.
• Fatiha Benmokhtar, Duquesne University, 600 Forbes Avenue, Pittsburgh, Pennsylvania 15282, USA.
• A Bianconi, INFN, Sezione di Pavia, 27100 Pavia, Italy.
• A S. Biselli, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
• F Bossù, IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France.
• S Boiarinov, Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
• W J. Briscoe, The George Washington University, Washington, D.C. 20052, USA.
• W K. Brooks, Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
• D Bulumulla, Old Dominion University, Norfolk, Virginia 23529, USA.
• V D. Burkert, Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
• D S. Carman, Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
• J C. Carvajal, Florida International University, Miami, Florida 33199, USA.
• A Celentano, INFN, Sezione di Genova, 16146 Genova, Italy.
• P Chatagnon, Universit'e Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France.
• T Chetry, Mississippi State University, Mississippi State, Mississippi 39762-5167, USA.
• G Ciullo, Universita' di Ferrara, 44121 Ferrara, Italy.
• B Clary, University of Connecticut, Storrs, Connecticut 06269, USA.
• P L. Cole, Lamar University, 4400 MLK Blvd, PO Box 10009, Beaumont, Texas 77710, USA.
• M Contalbrigo, INFN, Sezione di Ferrara, 44100 Ferrara, Italy.
• V Crede, Florida State University, Tallahassee, Florida 32306, USA.
• A D'Angelo, INFN, Sezione di Roma Tor Vergata, 00133 Rome, Italy.

Document Type

Journal Article

Publication Date

2-12-2021

Publication Title

Physical review letters

Volume

126

Issue

6

First Page

62002

Abstract

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 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 A_{LU}^{sinϕ_{R}} 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.

Open Access

Green Accepted

Repository Citation

Mirazita, M., Avakian, H., Courtoy, A., Pisano, S., Adhikari, S., Amaryan, M. J., Angelini, G., Atac, H., Baltzell, N. A., Barion, L., Battaglieri, M., Bedlinskiy, I., Benmokhtar, F., Bianconi, A., Biselli, A. S., Bossù, F., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Bulumulla, D., Burkert, V. D., Carman, D. S., Carvajal, J. C., Celentano, A., Chatagnon, P., Chetry, T., Ciullo, G., Clary, B., Cole, P. L., Contalbrigo, M., Crede, V., & D'Angelo, A. (2021). Beam Spin Asymmetry in Semi-Inclusive Electroproduction of Hadron Pairs. Physical review letters, 126 (6), 62002. https://doi.org/10.1103/PhysRevLett.126.062002