Unique Access to u-Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction

W B Li^{1

2}, G M Huber¹, H P Blok^{3

4}, D Gaskell⁵, T Horn⁶, K Semenov-Tian-Shansky^{7

8}, B Pire⁹, L Szymanowski¹⁰, J-M Laget⁵, K Aniol¹¹, J Arrington¹², E J Beise¹³, W Boeglin¹⁴, E J Brash¹⁵, H Breuer¹³, C C Chang¹³, M E Christy¹⁶, R Ent⁵, E F Gibson¹⁷, R J Holt¹⁸, S Jin¹⁹, M K Jones⁵, C E Keppel^{5

16}, W Kim¹⁹, P M King²⁰, V Kovaltchouk²¹, J Liu²², G J Lolos¹, D J Mack⁵, D J Margaziotis¹¹, P Markowitz¹⁴, A Matsumura²³, D Meekins⁵, T Miyoshi²³, H Mkrtchyan²⁴, I Niculescu²⁵, Y Okayasu²³, L Pentchev⁵, C Perdrisat²⁶, D Potterveld¹², V Punjabi²⁷, P E Reimer¹², J Reinhold¹⁴, J Roche²⁰, P G Roos¹³, A Sarty²⁸, G R Smith⁵, V Tadevosyan²⁴, L G Tang^{5

16}, V Tvaskis^{4

3}, J Volmer^{3

29}, W Vulcan⁵, G Warren³⁰, S A Wood⁵, C Xu¹, X Zheng³¹; Jefferson Lab <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>F</mi></mrow><mrow><mi>π</mi></mrow></msub></mrow></math> Collaboration

Affiliations

¹ University of Regina, Regina, Saskatchewan S4S 0A2, Canada.
² College of William and Mary, Williamsburg, Virginia 23185, USA.
³ VU University, NL-1081 HV Amsterdam, Netherlands.
⁴ NIKHEF, Postbus 41882, NL-1009 DB Amsterdam, Netherlands.
⁵ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
⁶ Catholic University of America, Washington, D.C. 20064, USA.
⁷ National Research Centre Kurchatov Institute: Petersburg Nuclear Physics Institute, RU-188300 Gatchina, Russia.
⁸ Saint Petersburg National Research Academic University of the Russian Academy of Sciences, RU-194021 St. Petersburg, Russia.
⁹ CPHT, CNRS, École Polytechnique, IP Paris, 91128-Palaiseau, France.
¹⁰ National Centre for Nuclear Research (NCBJ), 02-093 Warsaw, Poland.
¹¹ California State University Los Angeles, Los Angeles, California 90032, USA.
¹² Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
¹³ University of Maryland, College Park, Maryland 20742, USA.
¹⁴ Florida International University, Miami, Florida 33119, USA.
¹⁵ Christopher Newport University, Newport News, Virginia 23606, USA.
¹⁶ Hampton University, Hampton, Virginia 23668, USA.
¹⁷ California State University, Sacramento, California 95819, USA.
¹⁸ Caltech, Pasadena, California 91125, USA.
¹⁹ Kyungpook National University, Daegu, 702-701, Republic of Korea.
²⁰ Ohio University, Athens, Ohio 45701, USA.
²¹ Ontario Tech University, Oshawa, Ontario L1G 0C5, Canada.
²² Shanghai Jiao Tong University, Shanghai 200240, China.
²³ Tohoku University, Sendai, Miyagi 980-8578, Japan.
²⁴ A.I. Alikhanyan National Science Laboratory, Yerevan 0036, Armenia.
²⁵ James Madison University, Harrisonburg, Virginia 22807, USA.
²⁶ College of William and Mary, Williamsburg, Virginia 23187, USA.
²⁷ Norfolk State University, Norfolk, Virginia 23504, USA.
²⁸ Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada.
²⁹ DESY, Hamburg 22607, Germany.
³⁰ Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
³¹ University of Virginia, Charlottesville, Virginia 22904, USA.

PMID: 31763910
DOI: 10.1103/PhysRevLett.123.182501

Unique Access to u-Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction

W B Li et al. Phys Rev Lett. 2019.

. 2019 Nov 1;123(18):182501.

doi: 10.1103/PhysRevLett.123.182501.

Authors

Affiliations

¹ University of Regina, Regina, Saskatchewan S4S 0A2, Canada.
² College of William and Mary, Williamsburg, Virginia 23185, USA.
³ VU University, NL-1081 HV Amsterdam, Netherlands.
⁴ NIKHEF, Postbus 41882, NL-1009 DB Amsterdam, Netherlands.
⁵ Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
⁶ Catholic University of America, Washington, D.C. 20064, USA.
⁷ National Research Centre Kurchatov Institute: Petersburg Nuclear Physics Institute, RU-188300 Gatchina, Russia.
⁸ Saint Petersburg National Research Academic University of the Russian Academy of Sciences, RU-194021 St. Petersburg, Russia.
⁹ CPHT, CNRS, École Polytechnique, IP Paris, 91128-Palaiseau, France.
¹⁰ National Centre for Nuclear Research (NCBJ), 02-093 Warsaw, Poland.
¹¹ California State University Los Angeles, Los Angeles, California 90032, USA.
¹² Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
¹³ University of Maryland, College Park, Maryland 20742, USA.
¹⁴ Florida International University, Miami, Florida 33119, USA.
¹⁵ Christopher Newport University, Newport News, Virginia 23606, USA.
¹⁶ Hampton University, Hampton, Virginia 23668, USA.
¹⁷ California State University, Sacramento, California 95819, USA.
¹⁸ Caltech, Pasadena, California 91125, USA.
¹⁹ Kyungpook National University, Daegu, 702-701, Republic of Korea.
²⁰ Ohio University, Athens, Ohio 45701, USA.
²¹ Ontario Tech University, Oshawa, Ontario L1G 0C5, Canada.
²² Shanghai Jiao Tong University, Shanghai 200240, China.
²³ Tohoku University, Sendai, Miyagi 980-8578, Japan.
²⁴ A.I. Alikhanyan National Science Laboratory, Yerevan 0036, Armenia.
²⁵ James Madison University, Harrisonburg, Virginia 22807, USA.
²⁶ College of William and Mary, Williamsburg, Virginia 23187, USA.
²⁷ Norfolk State University, Norfolk, Virginia 23504, USA.
²⁸ Saint Mary's University, Halifax, Nova Scotia B3H 3C3, Canada.
²⁹ DESY, Hamburg 22607, Germany.
³⁰ Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
³¹ University of Virginia, Charlottesville, Virginia 22904, USA.

PMID: 31763910
DOI: 10.1103/PhysRevLett.123.182501

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 ω electroproduction off the proton, ep→e^{'}pω, 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 σ_{T} over σ_{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: universal nonperturbative objects only accessible through backward-angle kinematics.

PubMed Disclaimer

LinkOut - more resources

Full Text Sources
- American Physical Society

Save citation to file

Email citation

Add to Collections

Add to My Bibliography

Your saved search

Create a file for external citation management software

Your RSS Feed

Unique Access to u-Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction

Affiliations

Unique Access to u-Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction

Authors

Affiliations

Abstract

LinkOut - more resources

Full Text Sources