First Measurement of Hard Exclusive ⁻Δ⁺⁺ Electroproduction Beam-Spin Asymmetries off the Proton
- 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.
- et al.
- CLAS Collaboration
DOIAbstract
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 impa...
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