Deep Exclusive Electroproduction of π^{0} at High Q^{2} in the Quark Valence Regime

DOI

10.1103/PhysRevLett.127.152301

M Dlamini, Ohio University, Athens, Ohio 45701, USA.
B Karki, Ohio University, Athens, Ohio 45701, USA.
S F. Ali, Catholic University of America, Washington, DC 20064, USA.
P-J Lin, Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France.
F Georges, Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France.
H-S Ko, Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France.
N Israel, Ohio University, Athens, Ohio 45701, USA.
M N. Rashad, Old Dominion University, Norfolk, Virginia 23529, USA.
A Stefanko, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
D Adikaram, Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
Z Ahmed, University of Regina, Regina, Saskatchewan S4S 0A2 Canada.
H Albataineh, Texas A&M University-Kingsville, Kingsville, Texas 78363, USA.
B Aljawrneh, North Carolina Ag. and Tech. State University, Greensboro, North Carolina 27411, USA.
K Allada, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
S Allison, Old Dominion University, Norfolk, Virginia 23529, USA.
S Alsalmi, Kent State University, Kent, Ohio 44240, USA.
D Androic, University of Zagreb, Trg Republike Hrvatske 14, 10000 Zagreb, Croatia.
K Aniol, California State University, Los Angeles, Los Angeles, California 90032, USA.
J Annand, SUPA School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom.
H Atac, Temple University, Philadelphia, Pennsylvania 19122, USA.
T Averett, The College of William and Mary, Williamsburg, Virginia 23185, USA.
C Ayerbe Gayoso, The College of William and Mary, Williamsburg, Virginia 23185, USA.
X Bai, University of Virginia, Charlottesville, Virginia 22904, USA.
J Bane, University of Tennessee, Knoxville, Tennessee 37996, USA.
S Barcus, The College of William and Mary, Williamsburg, Virginia 23185, USA.
K Bartlett, The College of William and Mary, Williamsburg, Virginia 23185, USA.
V Bellini, Istituto Nazionale di Fisica Nucleare, Dipt. Di Fisica delle Uni. di Catania, I-95123 Catania, Italy.
R Beminiwattha, Syracuse University, Syracuse, New York 13244, USA.
J Bericic, Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
D Biswas, Hampton University, Hampton, Virginia 23669, USA.
E Brash, Christopher Newport University, Newport News, Virginia 23606, USA.
D Bulumulla, Old Dominion University, Norfolk, Virginia 23529, USA.
R Trotta, Duquesne University, 600 Forbes Avenue, Pittsburgh, Pennsylvania 15282, USA

Document Type

Journal Article

Publication Date

10-8-2021

Publication Title

Physical review letters

Volume

127

Issue

15

First Page

152301

Abstract

We report measurements of the exclusive neutral pion electroproduction cross section off protons at large values of x_{B} (0.36, 0.48, and 0.60) and Q^{2} (3.1 to 8.4  GeV^{2}) obtained from Jefferson Lab Hall A experiment E12-06-014. The corresponding structure functions dσ_{T}/dt+εdσ_{L}/dt, dσ_{TT}/dt, dσ_{LT}/dt, and dσ_{LT^{'}}/dt are extracted as a function of the proton momentum transfer t-t_{min}. The results suggest the amplitude for transversely polarized virtual photons continues to dominate the cross section throughout this kinematic range. The data are well described by calculations based on transversity generalized parton distributions coupled to a helicity flip distribution amplitude of the pion, thus providing a unique way to probe the structure of the nucleon.

Open Access

OA

Link to Full Text

Share

COinS