Rosenbluth Separation of the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>π</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math> Electroproduction Cross Section
M. Defurne(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), M. Mazouz(University of Monastir), Z. Ahmed(Syracuse University), H. Al-Bataineh(Texas A&M University – Kingsville), K. Allada(Massachusetts Institute of Technology), K. Aniol(California State University Los Angeles), Vincenzo Bellini(Istituto Nazionale di Fisica Nucleare, Sezione di Catania), M. Benali(Centre National de la Recherche Scientifique), W. Boeglin(Florida International University), P.Y. Bertin(Centre National de la Recherche Scientifique), M. Brossard(Centre National de la Recherche Scientifique), A. Camsonne(Thomas Jefferson National Accelerator Facility), M. Canan(Old Dominion University), S. Chandavar(Ohio University), C. Chen(Hampton University), Jyh‐Ping Chen(Thomas Jefferson National Accelerator Facility), C. W. de Jager(Thomas Jefferson National Accelerator Facility), R. De Leo(University of Bari Aldo Moro), C. Desnault(Centre National de la Recherche Scientifique), A. Deur(Thomas Jefferson National Accelerator Facility), L. El Fassi(Rutgers, The State University of New Jersey), R. Ent(Thomas Jefferson National Accelerator Facility), D. Flay(Temple University), M. Friend(Carnegie Mellon University), E. Fuchey(Centre National de la Recherche Scientifique), S. Frullani(Istituto Nazionale di Fisica Nucleare, Sezione di Roma I), F. Garibaldi(Istituto Nazionale di Fisica Nucleare, Sezione di Roma I), D. Gaskell(Thomas Jefferson National Accelerator Facility), A. Giusa(Istituto Nazionale di Fisica Nucleare, Sezione di Catania), O. Glamazdin(Kharkiv Institute of Physics and Technology), S. Golge(North Carolina Central University), J. Gómez(Thomas Jefferson National Accelerator Facility), O. Hansen(Thomas Jefferson National Accelerator Facility), D. W. Higinbotham(Thomas Jefferson National Accelerator Facility), T. Holmstrom(Longwood University), T. Horn(University of America), J. Huang(Massachusetts Institute of Technology), M. Huang(Duke University), G. M. Huber(University of Regina), C. E. Hyde-Wright(Centre National de la Recherche Scientifique), S. Iqbal(California State University Los Angeles), F. Itard(Centre National de la Recherche Scientifique), Ho. Kang(Seoul National University), H. Kang(Seoul National University), A. Kelleher(William & Mary), C. Keppel(Thomas Jefferson National Accelerator Facility), S. Koirala(Old Dominion University), I. Korover(Tel Aviv University), J. J. LeRose(Thomas Jefferson National Accelerator Facility), R. Lindgren(University of Virginia), E. Long(Kent State University), M. Magne(Centre National de la Recherche Scientifique), J. Mammei(University of Massachusetts Amherst), D. J. Margaziotis(California State University Los Angeles), P. Markowitz(Florida International University), A. Martí Jiménez-Argüello(Centre National de la Recherche Scientifique), F. Meddi(Istituto Nazionale di Fisica Nucleare, Sezione di Roma I), D. Meekins(Thomas Jefferson National Accelerator Facility), R. Michaels(Thomas Jefferson National Accelerator Facility), M. Mihovilovič(University of Ljubljana), N. Muangma(Massachusetts Institute of Technology), C. Muñoz Camacho(Centre National de la Recherche Scientifique), P. Nadel-Turoński(Thomas Jefferson National Accelerator Facility), N. Nuruzzaman(Hampton University), R. Paremuzyan(Centre National de la Recherche Scientifique), A. J. R. Puckett(Los Alamos National Laboratory), V. Punjabi(Norfolk State University), Y. Qiang(Thomas Jefferson National Accelerator Facility), A. Rakhman(Syracuse University), M. N. H. Rashad(Old Dominion University), S. Riordan(Stony Brook University), J. Roche(Ohio University), G. Russo(Istituto Nazionale di Fisica Nucleare, Sezione di Catania), F. Sabatié(Commissariat à l'Énergie Atomique et aux Énergies Alternatives), Kiadtisak Saenboonruang(Kasetsart University), A. Saha(Thomas Jefferson National Accelerator Facility), B. Sawatzky(Thomas Jefferson National Accelerator Facility), L. Selvy(Kent State University), A. Shahinyan(A. Alikhanyan National Laboratory), S. Širca(University of Ljubljana), P. Solvignon(Thomas Jefferson National Accelerator Facility), M. L. Sperduto(Istituto Nazionale di Fisica Nucleare, Sezione di Catania), R. Subedi(George Washington University), V. Sulkosky(Massachusetts Institute of Technology), C. Sutera(Istituto Nazionale di Fisica Nucleare, Sezione di Catania), W. A. Tobias(University of Virginia), G. M. Urciuoli(Istituto Nazionale di Fisica Nucleare, Sezione di Roma I), D. Wang(University of Virginia), B. Wojtsekhowski(Thomas Jefferson National Accelerator Facility), H. Yao(Temple University), Z. Ye(University of Virginia), L. Zana(Syracuse University), X. Zhan(Argonne National Laboratory), J. Zhang(Thomas Jefferson National Accelerator Facility), B. Zhao(William & Mary), B. Zhao(University of Virginia), Xiaochao Zheng(University of Virginia), Peng Zhu(University of Virginia)
Cited by 56Open Access
Abstract
We present deeply virtual π^{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 Jefferson Lab Hall A experiment E07-007. The Rosenbluth technique is 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. Nonetheless, an indication of a nonzero longitudinal contribution is provided by the measured interference term σ_{LT}. 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 in which the scattering amplitude includes convolution terms of chiral-odd (transversity) GPDs of the nucleon with the twist-3 pion distribution amplitude. This experiment, together with previous extensive unseparated measurements, provides strong support to the exciting idea that transversity GPDs can be accessed via neutral pion electroproduction in the high-Q^{2} regime.
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