Unique Access to u-Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction
| Autor: | Li, WB, Huber, GM, Blok, HP, Gaskell, D, Horn, T, Semenov-Tian-Shansky, K, Pire, B, Szymanowski, L, Laget, J-M, Aniol, K, Arrington, J, Beise, EJ, Boeglin, W, Brash, EJ, Breuer, H, Chang, CC, Christy, ME, Ent, R, Gibson, EF, Holt, RJ, Jin, S, Jones, MK, Keppel, CE, Kim, W, King, PM, Kovaltchouk, V, Liu, J, Lolos, GJ, Mack, DJ, Margaziotis, DJ, Markowitz, P, Matsumura, A, Meekins, D, Miyoshi, T, Mkrtchyan, H, Niculescu, I, Okayasu, Y, Pentchev, L, Perdrisat, C, Potterveld, D, Punjabi, V, Reimer, PE, Reinhold, J, Roche, J, Roos, PG, Sarty, A, Smith, GR, Tadevosyan, V, Tang, LG, Tvaskis, V, Volmer, J, Vulcan, W, Warren, G, Wood, SA, Xu, C, Zheng, X, Jefferson Lab Collaboration |
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| Přispěvatelé: | University of Regina (UR), Vrije Universiteit Amsterdam [Amsterdam] (VU), Thomas Jefferson National Accelerator Facility (Jefferson Lab), Catholic University of America, National Research Center 'Kurchatov Institute' (NRC KI), Centre de Physique Théorique [Palaiseau] (CPHT), École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), National Center for Nuclear Research [Warsaw] (NCBJ), National Center for Nuclear Research (NCBJ), California State University [Los Angeles] (CAL STATE LA), Argonne National Laboratory [Lemont] (ANL), University of Maryland [College Park], University of Maryland System, California Institute of Technology (CALTECH), Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), College of William and Mary [Williamsburg] (WM), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X), Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Student Lab and Education, Pire, Bernard |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Nuclear Theory
electron p: interaction General Physics and Astronomy 01 natural sciences Omega Mathematical Sciences collinear [factorization] High Energy Physics - Experiment High Energy Physics - Experiment (hep-ex) High Energy Physics - Phenomenology (hep-ph) Engineering structure function nucleon: wave function Nuclear Experiment (nucl-ex) Nuclear Experiment wave function [nucleon] Quantum chromodynamics Physics |
| Zdroj: | Physical review letters, vol 123, iss 18 Physical review letters 123(18), 182501 (2019). doi:10.1103/PhysRevLett.123.182501 Physical Review Letters, 123(18):182501. American Physical Society (Jefferson Lab Fπ Collaboration) 2019, ' Unique Access to υ-Channel Physics : Exclusive Backward-Angle Omega Meson Electroproduction ', Physical Review Letters, vol. 123, no. 18, 182501 . https://doi.org/10.1103/PhysRevLett.123.182501 |
| ISSN: | 0031-9007 |
| DOI: | 10.1103/PhysRevLett.123.182501 |
| Popis: | Physical review letters 123(18), 182501 (2019). doi:10.1103/PhysRevLett.123.182501 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 ω electroproduction off the proton, ep→e′pω, at central Q2 values of 1.60, 2.45 GeV2, at W=2.21 GeV. The results of our pioneering -u≈-umin 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 Q2=2.45 GeV2, the observed dominance of σT over σL, 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: universal nonperturbative objects only accessible through backward-angle kinematics. Published by APS, College Park, Md. |
| Databáze: | OpenAIRE |
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