Rosenbluth separation of the π⁰ electroproduction cross section

M. Defurne , M. Mazouz , H. Albataineh , K. Allada , K. A. Aniol , V. Bellini , M. Benali , W. Boeglin

show 86 more authors

P. Bertin M. Brossard A. Camsonne M. Canan S. Chandavar C. Chen J.-P. Chen C.W. de Jager R. De Leo C. Desnault A. Deur L. El Fassi R. Ent D. Flay M. Friend E. Fuchey S. Frullani F. Garibaldi D. Gaskell A. Giusa O. Glamazdin S. Golge J. Gomez O. Hansen D. Higinbotham T. Holmstrom T. Horn J. Huang M. Huang C.E. Hyde S. Iqbal F. Itard H. Kang A. Kelleher C. Keppel S. Koirala I. Korover J.J. LeRose R. Lindgren E. Long M. Magne J. Mammei D.J. Margaziotis P. Markowitz A. Marti Jimenez-Arguello F. Meddi D. Meekins R. Michaels M. Mihovilovic C. Munoz Camacho P. Nadel-Turonski N. Nuruzzaman R. Paremuzyan A. Puckett V. Punjabi Y. Qiang A. Rakhman M.N.H. Rashad S. Riordan J. Roche G. Russo F. Sabati K. Saenboonruang A. Saha B. Sawatzky L. Selvy A. Shahinyan S. Sirca P. Solvignon M.L. Sperduto R. Subedi V. Sulkosky C. Sutera W.A. Tobias G.M. Urciuoli D. Wang B. Wojtsekhowski H. Yao Z. Ye A. Zafar X. Zhan J. Zhang B. Zhao Z. Zhao X. Zheng P. Zhu

Authors on Pith no claims yet

classification ✦ hep-ex nucl-ex

keywords electroproductiongpdsamplitudecrossexperimentlongitudinalmodelsobtained

0 comments

read the original abstract

We present deeply virtual $\pi^0$ electroproduction cross-section measurements at $x_B$=0.36 and three different $Q^2$--values ranging from 1.5 to 2 GeV$^2$, obtained from experiment E07-007 that ran in the Hall A at Jefferson Lab. The Rosenbluth technique was used to separate the longitudinal and transverse responses. Results demonstrate that the cross section is dominated by its transverse component, and thus is far from the asymptotic limit predicted by perturbative Quantum Chromodynamics. An indication of a non-zero longitudinal contribution is provided by the interference term $\sigma_{LT}$ also measured. Results are compared with several models based on the leading twist approach of Generalized Parton Distributions (GPDs). In particular, a fair agreement is obtained with models where the scattering amplitude is described by a convolution of chiral-odd (transversity) GPDs of the nucleon with the twist-3 pion distribution amplitude. Therefore, neutral pion electroproduction may offer the exciting possibility of accessing transversity GPDs through experiment.

This paper has not been read by Pith yet.

discussion (0)

Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

Exclusive photoproduction of a di-meson pair with large invariant mass
hep-ph 2026-05 unverdicted novelty 7.0

Calculations of di-meson photoproduction amplitudes at leading order show cross sections up to 100 times larger than single-meson cases, enabling better GPD extraction.