Publications
Publication Information
| Title | Unique Access to u-Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction |
| Authors | W. Li, Garth Huber, Hendrik Blok, David Gaskell, Tanja Horn, Kirill Semenov-Tyan-Shanskiy, Bernard Pire, Lech Szymanowski, Jean-Marc Laget, Konrad Aniol, John Arrington, Elizabeth Beise, Werner Boeglin, Edward Brash, Herbert Breuer, C. Chang, Michael Christy, Rolf Ent, E. Gibson, R. Holt, S. Jin, Mark Jones, Cynthia Keppel, Wooyoung Kim, Paul King, Vitali Kovaltchouk, J. Liu, George Lolos, David Mack, Demetrius Margaziotis, Pete Markowitz, Akihiko Matsumura, David Meekins, Toshinobu Miyoshi, Hamlet Mkrtchyan, Maria Niculescu, Yuichi Okayasu, Lubomir Pentchev, Charles Perdrisat, David Potterveld, Vina Punjabi, Paul Reimer, Joerg Reinhold, Julie Roche, Philip Roos, Adam Sarty, Gregory Smith, Vardan Tadevosyan, Liguang Tang, Vladas Tvaskis, Jochen Volmer, William Vulcan, Glen Warren, Stephen Wood, Chuncheng Xu, Xiaochao Zheng |
| JLAB number | JLAB-PHY-19-3091 |
| LANL number | arXiv:1910.00464 |
| Other number | DOE/OR/23177-4799 |
| Document Type(s) | (Journal Article) |
| Associated with EIC: | No |
| Supported by Jefferson Lab LDRD Funding: | No |
| Funding Source: | Nuclear Physics (NP) |
|
Journal Compiled for Physical Review Letters Volume 123 Page(s) 182501 Refereed | |
| Publication Abstract: | Backward-angle meson electroproduction above the resonance region, which was previously ignored, is anticipated to offer unique access to the three quark plus sea component of the nucleon wave function. In this letter, we present the first complete separation of the four electromagnetic structure functions above the resonance region in exclusive omega electroproduction off the proton, e + p -> e' + p + omega, at central Q^2 values of 1.60, 2.45 GeV^2 , at W = 2.21 GeV. The results of our pioneering -u ~ -u min study demonstrate the existence of a unanticipated backward-angle cross section peak and the feasibility of full L/T/LT/TT separations in this never explored kinematic territory. At Q^2 =2.45 GeV^2 , the observed dominance of sigma_T over sigma_L, is qualitatively consistent with the collinear QCD description in the near-backward regime, in which the scattering amplitude factorizes into a hard subprocess amplitude and baryon to meson transition distribution amplitudes (TDAs): universal non-perturbative objects only accessible through backward angle kinematics. |
| Experiment Numbers: | |
| Group: | Hall C |
| Document: | |
| DOI: | https://doi.org/10.1103/PhysRevLett.123.182501 |
| Accepted Manuscript: | 1910.00464.pdf |
| Supporting Documents: | |
| Supporting Datasets: | |