Amultidimensional extraction of the structure function ratio σLT/σ0 from the hard exclusive ep → enπ+ reaction above the resonance region has been performed. The study was done based on beam spin asymmetry measurements using a 10.6 GeV incident electron beam on a liquid-hydrogen target and the CLAS12 spectrometer at Jefferson Lab. The measurements focus on the very forward regime (t/Q2 1) with a wide kinematic range of xB in the valence regime (0.17 < xB < 0.55), and virtualities Q2 ranging from 1.5 GeV2 up to 6 GeV2. The results and their comparison to theoretical models based on Generalized Parton Distributions demonstrate the sensitivity to chiral-odd GPDs and the directly related tensor charge of the nucleon. In addition, the data is compared to an extension of a Regge formalism at high photon virtualities. It was found that the Regge model provides a better description at low Q2, while the GPD model is more appropriate at high Q2.
Diehl, S., Kim, A., Joo, K., Achenbach, P., Akbar, Z., Amaryan, M.j., et al. (2023). A multidimensional study of the structure function ratio σLT/σ0 from hard exclusive pi+ electro-production off protons in the GPD regime. PHYSICS LETTERS. SECTION B, 839 [10.1016/j.physletb.2023.137761].
A multidimensional study of the structure function ratio σLT/σ0 from hard exclusive pi+ electro-production off protons in the GPD regime
A. D'AngeloWriting – Review & Editing
;L. LanzaWriting – Review & Editing
;
2023-01-01
Abstract
Amultidimensional extraction of the structure function ratio σLT/σ0 from the hard exclusive ep → enπ+ reaction above the resonance region has been performed. The study was done based on beam spin asymmetry measurements using a 10.6 GeV incident electron beam on a liquid-hydrogen target and the CLAS12 spectrometer at Jefferson Lab. The measurements focus on the very forward regime (t/Q2 1) with a wide kinematic range of xB in the valence regime (0.17 < xB < 0.55), and virtualities Q2 ranging from 1.5 GeV2 up to 6 GeV2. The results and their comparison to theoretical models based on Generalized Parton Distributions demonstrate the sensitivity to chiral-odd GPDs and the directly related tensor charge of the nucleon. In addition, the data is compared to an extension of a Regge formalism at high photon virtualities. It was found that the Regge model provides a better description at low Q2, while the GPD model is more appropriate at high Q2.| File | Dimensione | Formato | |
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