| Title: |
First Measurement of Hard Exclusive 𝛑⁻Δ⁺⁺ Electroproduction Beam-Spin Asymmetries off the Proton |
| Authors: |
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.; Brinkman, K.-T.; Zurek, M.; CLAS Collaboration |
| Source: |
Physics Faculty Publications |
| Publisher Information: |
ODU Digital Commons |
| Publication Year: |
2023 |
| Collection: |
Old Dominion University: ODU Digital Commons |
| Subject Terms: |
Electron & positron scattering; Generalized parton distributions; Baryons; Mesons; Pions; High energy physics; Physics; Experiment; Elementary Particles and Fields and String Theory; Quantum Physics |
| Description: |
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. |
| Document Type: |
article in journal/newspaper |
| File Description: |
application/pdf |
| Language: |
unknown |
| Relation: |
https://digitalcommons.odu.edu/physics_fac_pubs/802; https://digitalcommons.odu.edu/context/physics_fac_pubs/article/1804/viewcontent/Bulumulla_2023_FirstMeasurementofHardExclusivePi_.pdf |
| DOI: |
10.1103/PhysRevLett.131.021901 |
| Availability: |
https://digitalcommons.odu.edu/physics_fac_pubs/802; https://doi.org/10.1103/PhysRevLett.131.021901; https://digitalcommons.odu.edu/context/physics_fac_pubs/article/1804/viewcontent/Bulumulla_2023_FirstMeasurementofHardExclusivePi_.pdf |
| 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 SCOAP 3 . |
| Accession Number: |
edsbas.6447C93C |
| Database: |
BASE |