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Huber GM, Blok HP, Butuceanu C, et al. Separated response function ratios in exclusive, forward π(±) electroproduction. Phys Rev Lett. 2014;112(18):182501doi: 10.1103/PhysRevLett.112.182501.
Huber, G. M., Blok, H. P., Butuceanu, C., Gaskell, D., Horn, T., Mack, D. J., Abbott, D., Aniol, K., Anklin, H., Armstrong, C., Arrington, J., Assamagan, K., Avery, S., Baker, O. K., Barrett, B., Beise, E. J., Bochna, C., Boeglin, W., Brash, E. J., Breuer, H., Chang, C. C., Chant, N., Christy, M. E., Dunne, J., Eden, T., Ent, R., Fenker, H., Gibson, E. F., Gilman, R., Gustafsson, K., Hinton, W., Holt, R. J., Jackson, H., Jin, S., Jones, M. K., Keppel, C. E., Kim, P. H., Kim, W., King, P. M., Klein, A., Koltenuk, D., Kovaltchouk, V., Liang, M., Liu, J., Lolos, G. J., Lung, A., Margaziotis, D. J., Markowitz, P., Matsumura, A., McKee, D., Meekins, D., Mitchell, J., Miyoshi, T., Mkrtchyan, H., Mueller, B., Niculescu, G., Niculescu, I., Okayasu, Y., Pentchev, L., Perdrisat, C., Pitz, D., Potterveld, D., Punjabi, V., Qin, L. M., Reimer, P. E., Reinhold, J., Roche, J., Roos, P. G., Sarty, A., Shin, I. K., Smith, G. R., Stepanyan, S., Tang, L. G., Tadevosyan, V., Tvaskis, V., van der Meer, R. L., Vansyoc, K., Van Westrum, D., Vidakovic, S., Volmer, J., Vulcan, W., Warren, G., Wood, S. A., Xu, C., Yan, C., Zhao, W. X., Zheng, X., Zihlmann, B. (2014). Separated response function ratios in exclusive, forward π(±) electroproduction. Physical review letters, 112(18), 182501. https://doi.org/10.1103/PhysRevLett.112.182501
Huber, G M, et al. "Separated response function ratios in exclusive, forward π(±) electroproduction." Physical review letters vol. 112,18 (2014): 182501. doi: https://doi.org/10.1103/PhysRevLett.112.182501
Huber GM, Blok HP, Butuceanu C, Gaskell D, Horn T, Mack DJ, Abbott D, Aniol K, Anklin H, Armstrong C, Arrington J, Assamagan K, Avery S, Baker OK, Barrett B, Beise EJ, Bochna C, Boeglin W, Brash EJ, Breuer H, Chang CC, Chant N, Christy ME, Dunne J, Eden T, Ent R, Fenker H, Gibson EF, Gilman R, Gustafsson K, Hinton W, Holt RJ, Jackson H, Jin S, Jones MK, Keppel CE, Kim PH, Kim W, King PM, Klein A, Koltenuk D, Kovaltchouk V, Liang M, Liu J, Lolos GJ, Lung A, Margaziotis DJ, Markowitz P, Matsumura A, McKee D, Meekins D, Mitchell J, Miyoshi T, Mkrtchyan H, Mueller B, Niculescu G, Niculescu I, Okayasu Y, Pentchev L, Perdrisat C, Pitz D, Potterveld D, Punjabi V, Qin LM, Reimer PE, Reinhold J, Roche J, Roos PG, Sarty A, Shin IK, Smith GR, Stepanyan S, Tang LG, Tadevosyan V, Tvaskis V, van der Meer RL, Vansyoc K, Van Westrum D, Vidakovic S, Volmer J, Vulcan W, Warren G, Wood SA, Xu C, Yan C, Zhao WX, Zheng X, Zihlmann B. Separated response function ratios in exclusive, forward π(±) electroproduction. Phys Rev Lett. 2014 May 09;112(18):182501. doi: 10.1103/PhysRevLett.112.182501. Epub 2014 May 05. PMID: 24856691.
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Phys Rev Lett. 2014 May 09;112(18):182501. doi: 10.1103/PhysRevLett.112.182501. Epub 2014 May 05.

Separated response function ratios in exclusive, forward π(±) electroproduction.

Physical review letters

G M Huber, H P Blok, C Butuceanu, D Gaskell, T Horn, D J Mack, D Abbott, K Aniol, H Anklin, C Armstrong, J Arrington, K Assamagan, S Avery, O K Baker, B Barrett, E J Beise, C Bochna, W Boeglin, E J Brash, H Breuer, C C Chang, N Chant, M E Christy, J Dunne, T Eden, R Ent, H Fenker, E F Gibson, R Gilman, K Gustafsson, W Hinton, R J Holt, H Jackson, S Jin, M K Jones, C E Keppel, P H Kim, W Kim, P M King, A Klein, D Koltenuk, V Kovaltchouk, M Liang, J Liu, G J Lolos, A Lung, D J Margaziotis, P Markowitz, A Matsumura, D McKee, D Meekins, J Mitchell, T Miyoshi, H Mkrtchyan, B Mueller, G Niculescu, I Niculescu, Y Okayasu, L Pentchev, C Perdrisat, D Pitz, D Potterveld, V Punjabi, L M Qin, P E Reimer, J Reinhold, J Roche, P G Roos, A Sarty, I K Shin, G R Smith, S Stepanyan, L G Tang, V Tadevosyan, V Tvaskis, R L J van der Meer, K Vansyoc, D Van Westrum, S Vidakovic, J Volmer, W Vulcan, G Warren, S A Wood, C Xu, C Yan, W-X Zhao, X Zheng, B Zihlmann,

Affiliations

  1. University of Regina, Regina, Saskatchewan S4S 0A2, Canada.
  2. VU university, NL-1081 HV Amsterdam, The Netherlands and NIKHEF, Postbus 41882, NL-1009 DB Amsterdam, The Netherlands.
  3. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA.
  4. Catholic University of America, Washington, DC 20064, USA.
  5. California State University Los Angeles, Los Angeles, California 90032, USA.
  6. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA and Florida International University, Miami, Florida 33119, USA.
  7. College of William and Mary, Williamsburg, Virginia 23187, USA.
  8. Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
  9. Hampton University, Hampton, Virginia 23668, USA.
  10. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA and Hampton University, Hampton, Virginia 23668, USA.
  11. Saint Mary's University, Halifax, Nova Scotia B3H 3C3 Canada.
  12. University of Maryland, College Park, Maryland 20742, USA.
  13. University of Illinois, Champaign, Illinois 61801, USA.
  14. Florida International University, Miami, Florida 33119, USA.
  15. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA and Norfolk State University, Norfolk, Virginia 23504, USA.
  16. California State University, Sacramento, California 95819, USA.
  17. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA and Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA.
  18. Kyungpook National University, Daegu 702-701, Republic of Korea.
  19. Old Dominion University, Norfolk, Virginia 23529, USA.
  20. University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
  21. Tohoku University, Sendai, Japan.
  22. New Mexico State University, Las Cruces, New Mexico 88003-8001, USA.
  23. A.I. Alikhanyan National Science Laboratory, Yerevan 0036, Armenia.
  24. James Madison University, Harrisonburg, Virginia 22807, USA.
  25. DAPNIA/SPhN, CEA/Saclay, F-91191 Gif-sur-Yvette, France.
  26. Norfolk State University, Norfolk, Virginia 23504, USA.
  27. University of Colorado, Boulder, Colorado 80309, USA.
  28. VU university, NL-1081 HV Amsterdam, The Netherlands and DESY, Hamburg, Germany.
  29. Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
  30. Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA and University of Virginia, Charlottesville, Virginia 22901, USA.

PMID: 24856691 DOI: 10.1103/PhysRevLett.112.182501

Abstract

The study of exclusive π(±) electroproduction on the nucleon, including separation of the various structure functions, is of interest for a number of reasons. The ratio RL=σL(π-)/σL(π+) is sensitive to isoscalar contamination to the dominant isovector pion exchange amplitude, which is the basis for the determination of the charged pion form factor from electroproduction data. A change in the value of RT=σT(π-)/σT(π+) from unity at small -t, to 1/4 at large -t, would suggest a transition from coupling to a (virtual) pion to coupling to individual quarks. Furthermore, the mentioned ratios may show an earlier approach to perturbative QCD than the individual cross sections. We have performed the first complete separation of the four unpolarized electromagnetic structure functions above the dominant resonances in forward, exclusive π(±) electroproduction on the deuteron at central Q(2) values of 0.6, 1.0, 1.6  GeV(2) at W=1.95  GeV, and Q(2)=2.45  GeV(2) at W=2.22  GeV. Here, we present the L and T cross sections, with emphasis on RL and RT, and compare them with theoretical calculations. Results for the separated ratio RL indicate dominance of the pion-pole diagram at low -t, while results for RT are consistent with a transition between pion knockout and quark knockout mechanisms.

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