Measurement of Spin-Density Matrix Elements in p(770) Production with a Linearly Polarized Photon Beam at E𝛾 = 8.2-8.8 GeV

Authors

S. Adhikari, Old Dominion University
F. Afzal
C. S. Akondi
M. Albrecht
M. Amaryan, Old Dominion UniversityFollow
V. Arroyave
A. Asaturyan
A. Austregesilo
Z. Baldwin
F. Barbosa
J. Barlow
E. Barriga
R. Barsotti
T. D. Beattie
V. V. Berdnikov
T. Black
W. Boeglin
W. J. Briscoe
T. Britton
B. Zihlmann
Et al.
GlueX Collaboration

Document Type

Article

Publication Date

2023

DOI

10.1103/PhysRevC.108.055204

Publication Title

Physical Review C

Volume

108

Issue

5

Pages

055204 (1-15)

Abstract

The GlueX experiment at Jefferson Lab studies photoproduction of mesons using linearly polarized 8.5 GeV photons impinging on a hydrogen target which is contained within a detector with near-complete coverage for charged and neutral particles. We present measurements of spin-density matrix elements for the photoproduction of the vector meson ρ(770). The statistical precision achieved exceeds that of previous experiments for polarized photoproduction in this energy range by orders of magnitude. We confirm a high degree of s-channel helicity conservation at small squared four-momentum transfer t and are able to extract the t dependence of natural- and unnatural-parity exchange contributions to the production process in detail. We confirm the dominance of natural-parity exchange over the full t range. We also find that helicity amplitudes in which the helicity of the incident photon and the photoproduced ρ(770) differ by two units are negligible for −t < 0.5 GeV²/c².

Rights

© 2023 American Physical Society

"Yes, the author or the author's employer may use all or part of the APS published article, including the APS-prepared version (e.g., the PDF from the online journal) without revision or modification, on the author's or employer's website as long as a fee is not charged. If a fee is charged, then APS permission must be sought. In all cases, the appropriate bibliographic citation and notice of APS copyright must be included."

Original Publication Citation

Adhikari, S., Afzal, F., Akondi, C. S., Albrecht, M., Amaryan, M., Arroyave, V., Asaturyan, A., Austregesilo, A., Baldwin, Z., Barbosa, F., Barlow, J., Barriga, E., Barsotti, R., Beattie, T. D., Berdnikov, V. V., Black, T., Boeglin, W., Briscoe, W. J., Britton, T., . . . Zihlmann, B. (2023). Measurement of spin-density matrix elements in p(770) production with a linearly polarized photon beam at E𝛾 = 8.2-8.8 GeV. Physical Review C, 108(5), 1-15, Article 055204. https://doi.org/10.1103/PhysRevC.108.055204

ORCID

0000-0001-9288-8008 (Adhikari), 0000-0002-5648-0256 (Amaryan), 0009-0003-5562-6465 (Viducic)

Repository Citation

Adhikari, S.; Afzal, F.; Akondi, C. S.; Albrecht, M.; Amaryan, M.; Arroyave, V.; Asaturyan, A.; Austregesilo, A.; Baldwin, Z.; Barbosa, F.; Barlow, J.; Barriga, E.; Barsotti, R.; Beattie, T. D.; Berdnikov, V. V.; Black, T.; Boeglin, W.; Briscoe, W. J.; Britton, T.; Zihlmann, B.; Et al.; and GlueX Collaboration, "Measurement of Spin-Density Matrix Elements in p(770) Production with a Linearly Polarized Photon Beam at E𝛾 = 8.2-8.8 GeV" (2023). Physics Faculty Publications. 826.
https://digitalcommons.odu.edu/physics_fac_pubs/826