Document Type

Article

Publication Date

2023

DOI

10.1103/PhysRevLett.131.021901

Publication Title

Physical Review Letters

Volume

131

Issue

2

Pages

021901 (1-7)

Abstract

The polarized cross-section ratio σLT′/σ0 from hard exclusive π−Δ++ electroproduction off an unpolarized hydrogen target has been extracted based on beam-spin asymmetry measurements using a 10.2  GeV/10.6  GeV incident electron beam and the CLAS12 spectrometer at Jefferson Lab. The study, which provides the first observation of this channel in the deep-inelastic regime, focuses on very forward-pion kinematics in the valence regime, and photon virtualities ranging from 1.5  GeV2 up to 7  GeV2. The reaction provides a novel access to the d-quark content of the nucleon and to p→Δ++ transition generalized parton distributions. A comparison to existing results for hard exclusive π+n and π0p electroproduction is provided, which shows a clear impact of the excitation mechanism, encoded in transition generalized parton distributions, on the asymmetry.

Rights

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) License. Further distribution of this work must maintain attribution to the authors and the published article's title, journal citation, and DOI. Funded by SCOAP3.

Original Publication Citation

Diehl, S., Trotta, N., Joo, K., Achenbach, P., Akbar, Z., Armstrong, W. R., Atac, H., Avakian, H., Baashen, L., Baltzell, N. A., Barion, L., Bashkanov, M., Battaglieri, M., Bedlinskiy, I., Benmokhtar, F., Bianconi, A., Biselli, A. S., Bossù, F., Brinkmann, K. T., . . . Zurek, M. (2023). First measurement of hard exclusive 𝛑⁻Δ⁺⁺ electroproduction beam-spin asymmetries off the proton. Physical Review Letters, 131(2) 1-7, Article 021901. https://doi.org/10.1103/PhysRevLett.131.021901

ORCID

0000-0002-4136-2572 (Bulumulla), 0000-0003-2086-2807 (Hattawy), 0000-0002-3598-4594 (Pandey)

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