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

Li, W. B.; Huber, G. M.; Blok, H. P.; Gaskell, D.; Horn, T.; Semenov-Tian-Shansky, K.; Pire, B.; Szymanowski, L.; Laget, J. -M.; Aniol, K.; Arrington, J.; Beise, E. J.; Boeglin, W.; Brash, E. J.; Breuer, H.; Chang, C. C.; Christy, M. E.; Ent, R.; Gibson, E. F.; Holt, R. J.; Jin, S.; Jones, M. K.; Keppel, C. E.; Kim, W.; King, P. M.; Kovaltchouk, V.; Liu, J.; Lolos, G. J.; Mack, D. J.; Margaziotis, D. J.; Markowitz, P.; Matsumura, A.; Meekins, D.; Miyoshi, T.; Mkrtchyan, H.; Niculescu, I.; Okayasu, Y.; Pentchev, L.; Perdrisat, C.; Potterveld, D.; Punjabi, V.; Reimer, P. E.; Reinhold, J.; Roche, J.; Roos, P. G.; Sarty, A.; Smith, G. R.; Tadevosyan, V.; Tang, L. G.; Tvaskis, V.; Volmer, J.; Vulcan, W.; Warren, G.; Wood, S. A.; Xu, C.; Zheng, X.

doi:10.1103/PhysRevLett.123.182501

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

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 sub-process amplitude and baryon to meson transition distribution amplitudes: universal nonperturbative objects only accessible through backward-angle kinematics.

Authors:: Li, W. B.; Huber, G. M.; Blok, H. P.; Gaskell, D.; Horn, T.; Semenov-Tian-Shansky, K.; Pire, B.; Szymanowski, L.; Laget, J. -M.; Aniol, K.; Arrington, J.; Beise, E. J.; Boeglin, W.; Brash, E. J.; Breuer, H.; Chang, C. C.; Christy, M. E.; Ent, R.; Gibson, E. F.; Holt, R. J. more »« less

Publication Date:: Thu Oct 31 00:00:00 EDT 2019

Research Org.:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP); Natural Sciences and Engineering Research Council of Canada (NSERC); National Science Foundation (NSF); National Research Foundation of Korea (NRF); National Science Centre (Poland)

Contributing Org.:: Jefferson Lab $F_{π}$ Collaboration

OSTI Identifier:: 1572901

Alternate Identifier(s):: OSTI ID: 1573494; OSTI ID: 1830333

Report Number(s):: JLAB-PHY-19-3091; DOE/OR/23177-4799; arXiv:1910.00464
Journal ID: ISSN 0031-9007; PRLTAO; TRN: US2100206

Grant/Contract Number:: FRN: SPAPIN-2016-00031; AC05-06OR23177; AC02-06CH11357; 2017/26/M/ST2/01074; AC02-05CH11231

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review Letters

Additional Journal Information:: Journal Volume: 123; Journal Issue: 18; Journal ID: ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats


                    Li, W. B., Huber, G. M., Blok, H. P., Gaskell, D., Horn, T., Semenov-Tian-Shansky, K., Pire, B., Szymanowski, L., Laget, J. -M., Aniol, K., Arrington, J., Beise, E. J., Boeglin, W., Brash, E. J., Breuer, H., Chang, C. C., Christy, M. E., Ent, R., Gibson, E. F., Holt, R. J., Jin, S., Jones, M. K., Keppel, C. E., Kim, W., King, P. M., Kovaltchouk, V., Liu, J., Lolos, G. J., Mack, D. J., Margaziotis, D. J., Markowitz, P., Matsumura, A., Meekins, D., Miyoshi, T., Mkrtchyan, H., Niculescu, I., Okayasu, Y., Pentchev, L., Perdrisat, C., Potterveld, D., Punjabi, V., Reimer, P. E., Reinhold, J., Roche, J., Roos, P. G., Sarty, A., Smith, G. R., Tadevosyan, V., Tang, L. G., Tvaskis, V., Volmer, J., Vulcan, W., Warren, G., Wood, S. A., Xu, C., and Zheng, X. Unique Access to u-Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction.  United States: N. p., 2019. 
Web.  doi:10.1103/PhysRevLett.123.182501.

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                    Li, W. B., Huber, G. M., Blok, H. P., Gaskell, D., Horn, T., Semenov-Tian-Shansky, K., Pire, B., Szymanowski, L., Laget, J. -M., Aniol, K., Arrington, J., Beise, E. J., Boeglin, W., Brash, E. J., Breuer, H., Chang, C. C., Christy, M. E., Ent, R., Gibson, E. F., Holt, R. J., Jin, S., Jones, M. K., Keppel, C. E., Kim, W., King, P. M., Kovaltchouk, V., Liu, J., Lolos, G. J., Mack, D. J., Margaziotis, D. J., Markowitz, P., Matsumura, A., Meekins, D., Miyoshi, T., Mkrtchyan, H., Niculescu, I., Okayasu, Y., Pentchev, L., Perdrisat, C., Potterveld, D., Punjabi, V., Reimer, P. E., Reinhold, J., Roche, J., Roos, P. G., Sarty, A., Smith, G. R., Tadevosyan, V., Tang, L. G., Tvaskis, V., Volmer, J., Vulcan, W., Warren, G., Wood, S. A., Xu, C., & Zheng, X. Unique Access to u-Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction.  United States.  https://doi.org/10.1103/PhysRevLett.123.182501

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                    Li, W. B., Huber, G. M., Blok, H. P., Gaskell, D., Horn, T., Semenov-Tian-Shansky, K., Pire, B., Szymanowski, L., Laget, J. -M., Aniol, K., Arrington, J., Beise, E. J., Boeglin, W., Brash, E. J., Breuer, H., Chang, C. C., Christy, M. E., Ent, R., Gibson, E. F., Holt, R. J., Jin, S., Jones, M. K., Keppel, C. E., Kim, W., King, P. M., Kovaltchouk, V., Liu, J., Lolos, G. J., Mack, D. J., Margaziotis, D. J., Markowitz, P., Matsumura, A., Meekins, D., Miyoshi, T., Mkrtchyan, H., Niculescu, I., Okayasu, Y., Pentchev, L., Perdrisat, C., Potterveld, D., Punjabi, V., Reimer, P. E., Reinhold, J., Roche, J., Roos, P. G., Sarty, A., Smith, G. R., Tadevosyan, V., Tang, L. G., Tvaskis, V., Volmer, J., Vulcan, W., Warren, G., Wood, S. A., Xu, C., and Zheng, X. Thu .  
"Unique Access to u-Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction".  United States.  https://doi.org/10.1103/PhysRevLett.123.182501.  https://www.osti.gov/servlets/purl/1572901.

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@article{osti_1572901,

  title        = {Unique Access to u-Channel Physics: Exclusive Backward-Angle Omega Meson Electroproduction},

  author       = {Li, W. B. and Huber, G. M. and Blok, H. P. and Gaskell, D. and Horn, T. and Semenov-Tian-Shansky, K. and Pire, B. and Szymanowski, L. and Laget, J. -M. and Aniol, K. and Arrington, J. and Beise, E. J. and Boeglin, W. and Brash, E. J. and Breuer, H. and Chang, C. C. and Christy, M. E. and Ent, R. and Gibson, E. F. and Holt, R. J. and Jin, S. and Jones, M. K. and Keppel, C. E. and Kim, W. and King, P. M. and Kovaltchouk, V. and Liu, J. and Lolos, G. J. and Mack, D. J. and Margaziotis, D. J. and Markowitz, P. and Matsumura, A. and Meekins, D. and Miyoshi, T. and Mkrtchyan, H. and Niculescu, I. and Okayasu, Y. and Pentchev, L. and Perdrisat, C. and Potterveld, D. and Punjabi, V. and Reimer, P. E. and Reinhold, J. and Roche, J. and Roos, P. G. and Sarty, A. and Smith, G. R. and Tadevosyan, V. and Tang, L. G. and Tvaskis, V. and Volmer, J. and Vulcan, W. and Warren, G. and Wood, S. A. and Xu, C. and Zheng, X.},

  abstractNote = {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 sub-process amplitude and baryon to meson transition distribution amplitudes: universal nonperturbative objects only accessible through backward-angle kinematics.},

  doi          = {10.1103/PhysRevLett.123.182501},

  journal      = {Physical Review Letters},

  number       = 18,

  volume       = 123,

  place        = {United States},

  year         = {Thu Oct 31 00:00:00 EDT 2019},

  month        = {Thu Oct 31 00:00:00 EDT 2019}

}

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

Abstract

Citation Formats

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

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Generalized parton distributions and the structure of the nucleon
journal, September 2007

Nucleon wave functions and QCD sum rules
journal, January 1987

High-Energy Photoproduction of Charged Pions at Backward Angles
journal, September 1969

Charged pion form factor between $Q^{2} = 0.60$ and 2.45 ${GeV}^{2}$ . I. Measurements of the cross section for the $^{1} H (e, e^{'} π^{+}) n$ reaction
journal, October 2008

Space-time structure of hard-scattering processes
journal, September 2004

Hadron annihilation into two photons and backward virtual Compton scattering in the scaling regime of QCD
journal, June 2005

Unraveling hadron structure with generalized parton distributions
journal, October 2005