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'Angelo
Writing – Review & Editing
;
L. Lanza
Writing – 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.
2023
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/04 - FISICA NUCLEARE E SUBNUCLEARE
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
English
Con Impact Factor ISI
CLAS Collaboration
https://www.sciencedirect.com/science/article/pii/S0370269323000953
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].
Diehl, S; Kim, A; Joo, K; Achenbach, P; Akbar, Z; Amaryan, Mj; Atac, H; Avagyan, H; Ayerbe Gayoso, C; Baashen, L; Barion, L; Bashkanov, M; Battaglieri...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/319280
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