Beam Spin Asymmetry in Semi-Inclusive Electroproduction of Hadron Pairs

DOI

10.1103/PhysRevLett.126.062002

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

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