Rosenbluth separation of the $\pi^0$ electroproduction cross section
Abstract
We present deeply virtual electroproduction cross-section measurements at =0.36 and three different --values ranging from 1.5 to 2 GeV, 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 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.
Keywords
Cite
@article{arxiv.1608.01003,
title = {Rosenbluth separation of the $\pi^0$ electroproduction cross section},
author = {M. Defurne and M. Mazouz and H. Albataineh and K. Allada and K. A. Aniol and V. Bellini and M. Benali and W. Boeglin and P. Bertin and M. Brossard and A. Camsonne and M. Canan and S. Chandavar and C. Chen and J. -P. Chen and C. W. de Jager and R. de Leo and C. Desnault and A. Deur and L. El Fassi and R. Ent and D. Flay and M. Friend and E. Fuchey and S. Frullani and F. Garibaldi and D. Gaskell and A. Giusa and O. Glamazdin and S. Golge and J. Gomez and O. Hansen and D. Higinbotham and T. Holmstrom and T. Horn and J. Huang and M. Huang and C. E. Hyde and S. Iqbal and F. Itard and H. Kang and A. Kelleher and C. Keppel and S. Koirala and I. Korover and J. J. LeRose and R. Lindgren and E. Long and M. Magne and J. Mammei and D. J. Margaziotis and P. Markowitz and A. Marti Jimenez-Arguello and F. Meddi and D. Meekins and R. Michaels and M. Mihovilovic and C. Munoz Camacho and P. Nadel-Turonski and N. Nuruzzaman and R. Paremuzyan and A. Puckett and V. Punjabi and Y. Qiang and A. Rakhman and M. N. H. Rashad and S. Riordan and J. Roche and G. Russo and F. Sabati and K. Saenboonruang and A. Saha and B. Sawatzky and L. Selvy and A. Shahinyan and S. Sirca and P. Solvignon and M. L. Sperduto and R. Subedi and V. Sulkosky and C. Sutera and W. A. Tobias and G. M. Urciuoli and D. Wang and B. Wojtsekhowski and H. Yao and Z. Ye and A. Zafar and X. Zhan and J. Zhang and B. Zhao and Z. Zhao and X. Zheng and P. Zhu},
journal= {arXiv preprint arXiv:1608.01003},
year = {2016}
}
Comments
Submitted to Physical Review Letters