Separated response functions in exclusive, forward π± electroproduction on deuterium

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. J.; 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.

doi:10.1103/PhysRevC.91.015202

Title: Separated response functions in exclusive, forward $π^{\pm}$ electroproduction on deuterium

Abstract

Background: Measurements of forward exclusive meson production at different squared four-momenta of the exchanged virtual photon, Q², and at different four-momentum transfer, t, can be used to probe QCD's transition from meson-nucleon degrees of freedom at long distances to quark-gluon degrees of freedom at short scales. Ratios of separated response functions in π⁻ and π⁺ electroproduction are particularly informative. Ratio for transverse photons may allow this transition to be more easily observed, while the ratio for longitudinal photons provides a crucial verification of the assumed pole dominance, needed for reliable extraction of the pion form factor from electroproduction data. Method: Data were acquired with 2.6-5.2 GeV electron beams and the HMS+SOS spectrometers in Jefferson Lab Hall C, at central Q² values of 0.6, 1.0, 1.6 GeV² at W=1.95 GeV, and Q²=2.45 GeV² at W=2.22 GeV. There was significant coverage in Φ And ϵ, which allowed separation of σ_L,T,LT,TT. Results: σL shows a clear signature of the pion pole, with a sharp rise at small -t. In contrast, σ_T is much flatter versus t. The longitudinal/transverse ratios evolve with Q² and t, and at the highest Q²=2.45 GeV² show a slight enhancement for π⁻ Production compared to π⁺. The π⁻/π⁺+ ratiomore »« less

Authors:

; 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. more »

Publication Date:: Wed Jan 07 00:00:00 EST 2015

Research Org.:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Org.:: Jefferson Lab F _π Collaboration

OSTI Identifier:: 1167105

Alternate Identifier(s):: OSTI ID: 1181345

Report Number(s):: JLAB-PHY-14-1996; DOE/OR/23177-3258; arXiv:1412.5140
Journal ID: ISSN 0556-2813; PRVCAN; ArticleNumber: 015202

Grant/Contract Number:: AC05-84ER40150

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C, Nuclear Physics

Additional Journal Information:: Journal Volume: 91; Journal Issue: 1; Journal ID: ISSN 0556-2813

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats


                    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. J., 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., and Zihlmann, B. Separated response functions in exclusive, forward π± electroproduction on deuterium.  United States: N. p., 2015. 
Web.  doi:10.1103/PhysRevC.91.015202.

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                    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. J., 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. Separated response functions in exclusive, forward π± electroproduction on deuterium.  United States.  https://doi.org/10.1103/PhysRevC.91.015202

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                    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. J., 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., and Zihlmann, B. Wed .  
"Separated response functions in exclusive, forward π± electroproduction on deuterium".  United States.  https://doi.org/10.1103/PhysRevC.91.015202.  https://www.osti.gov/servlets/purl/1167105.

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@article{osti_1167105,

  title        = {Separated response functions in exclusive, forward π± electroproduction on deuterium},

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

  abstractNote = {Background: Measurements of forward exclusive meson production at different squared four-momenta of the exchanged virtual photon, Q2, and at different four-momentum transfer, t, can be used to probe QCD's transition from meson-nucleon degrees of freedom at long distances to quark-gluon degrees of freedom at short scales. Ratios of separated response functions in π⁻ and π⁺ electroproduction are particularly informative. Ratio for transverse photons may allow this transition to be more easily observed, while the ratio for longitudinal photons provides a crucial verification of the assumed pole dominance, needed for reliable extraction of the pion form factor from electroproduction data. Method: Data were acquired with 2.6-5.2 GeV electron beams and the HMS+SOS spectrometers in Jefferson Lab Hall C, at central Q2 values of 0.6, 1.0, 1.6 GeV2 at W=1.95 GeV, and Q2=2.45 GeV2 at W=2.22 GeV. There was significant coverage in Φ And ϵ, which allowed separation of σL,T,LT,TT. Results: σL shows a clear signature of the pion pole, with a sharp rise at small -t. In contrast, σT is much flatter versus t. The longitudinal/transverse ratios evolve with Q2 and t, and at the highest Q2=2.45 GeV2 show a slight enhancement for π⁻ Production compared to π⁺. The π⁻/π⁺+ ratio for transverse photons exhibits only a small Q2-dependence, following a nearly universal curve with t, with a steep transition to a value of about 0.25, consistent with s-channel quark knockout. The σTT/σT ratio also drops rapidly with Q2, qualitatively consistent with s-channel helicity conservation. The π⁻/π⁺ ratio for longitudinal photons indicates a small isoscalar contamination at W=1.95 GeV, consistent with what was observed in our earlier determination of the pion form factor at these kinematics.},

  doi          = {10.1103/PhysRevC.91.015202},

  journal      = {Physical Review C, Nuclear Physics},

  number       = 1,

  volume       = 91,

  place        = {United States},

  year         = {Wed Jan 07 00:00:00 EST 2015},

  month        = {Wed Jan 07 00:00:00 EST 2015}

}

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Title: Separated response functions in exclusive, forward π ± electroproduction on deuterium

Abstract

Citation Formats

An attempt to understand exclusive π + electroproduction journal, November 2009

Transversity in hard exclusive electroproduction of pseudoscalar mesons journal, September 2011

Hard Exclusive Electroproduction of Decuplet Baryons in the Large N c Limit journal, March 2000

Higher-twist effects in deep-inelastic scattering journal, January 1980

Unitary isobar model --MAID2007 journal, October 2007

The k2-dependence of the transverse pion electroproduction cross section in a generalized born term model journal, December 1972

Measurements of Single π − and π + Photoproduction at Small Momentum Transfers journal, July 1968

Pion and kaon photoproduction at high energies: forward and intermediate angles journal, December 1997

Scaling Laws at Large Transverse Momentum journal, October 1973

Electroproduction of ?+ n, ?- p andK + ?,K + 2211; 0 final states above the resonance region journal, June 1979

Electroproduction of single pions at low ε and a measurement of the pion form factor up to Q 2 = 10 GeV 2 journal, April 1978

Difficulty in determining the pion form factor at high Q^{2} journal, October 1990

Charged-pion electroproduction above the resonance region journal, February 2014

Cross section measurements of charged pion photoproduction in hydrogen and deuterium from 1.1 to 5.5 GeV journal, April 2005

Separated Response Function Ratios in Exclusive, Forward π ± Electroproduction journal, May 2014

A unitary isobar model for pion photo- and electroproduction on the proton up to 1 GeV journal, January 1999

Forward Charged-Pion Electroproduction from Fixed-Momentum-Transfer Dispersion Relations journal, May 1970

The High Momentum Spectrometer drift chambers in Hall C at CEBAF journal, December 1995

Polarization in coincidence electron scattering from nuclei journal, April 1989

Nucleon tensor charge from exclusive π 0 electroproduction journal, March 2009

Deep exclusive charged π electroproduction above the resonance region journal, April 2010

Hard exclusive electroproduction of pseudoscalar mesons and the QCD axial anomaly journal, May 1999

Determination of the Pion Charge Form Factor at Q 2 = 1.60 and 2.45 ( GeV / c ) 2 journal, November 2006

Cross-Section Measurement of Charged-Pion Photoproduction from Hydrogen and Deuterium journal, July 2003

Factorization for hard exclusive electroproduction of mesons in QCD journal, September 1997

Exclusive channels in deep inelastic Lepton-Nucleon scattering and the nature of gluons journal, November 1976

Determination of the pion charge form factor for Q 2 = 0.60–1.60 GeV 2 journal, May 2007

Longitudinal Electroproduction of Charged Pions from H 1 , H 2 , and H 3 e journal, October 2001

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

Charged pion form factor between Q 2 = 0 . 60 and 2 . 45 GeV 2 . II. Determination of, and results for, the pion form factor journal, October 2008

Hard exclusive meson production at next-to-leading order journal, August 2001

Regge description of charged pseudoscalar meson electroproduction above the resonance region journal, March 1998

Measurement of the Charged Pion Electromagnetic Form Factor journal, February 2001

Large momentum transfer electroproduction of mesons journal, November 2000

Radiative corrections for ( e , e ′ p ) reactions at GeV energies journal, October 2001

Title: Separated response functions in exclusive, forward $π^{\pm}$ electroproduction on deuterium

An attempt to understand exclusive π + electroproduction
journal, November 2009

Transversity in hard exclusive electroproduction of pseudoscalar mesons
journal, September 2011

Hard Exclusive Electroproduction of Decuplet Baryons in the Large $N_{c}$ Limit
journal, March 2000

Higher-twist effects in deep-inelastic scattering
journal, January 1980

Unitary isobar model --MAID2007
journal, October 2007

The k2-dependence of the transverse pion electroproduction cross section in a generalized born term model
journal, December 1972

Measurements of Single $π^{-}$ and $π^{+}$ Photoproduction at Small Momentum Transfers
journal, July 1968

Pion and kaon photoproduction at high energies: forward and intermediate angles
journal, December 1997

Scaling Laws at Large Transverse Momentum
journal, October 1973

Electroproduction of ?+ n, ?- p andK + ?,K + 2211; 0 final states above the resonance region
journal, June 1979

Electroproduction of single pions at low $ε$ and a measurement of the pion form factor up to $Q^{2} = 10$ ${GeV}^{2}$
journal, April 1978

Difficulty in determining the pion form factor at high Q^{2}
journal, October 1990

Charged-pion electroproduction above the resonance region
journal, February 2014

Cross section measurements of charged pion photoproduction in hydrogen and deuterium from 1.1 to 5.5 GeV
journal, April 2005

Separated Response Function Ratios in Exclusive, Forward $π^{\pm}$ Electroproduction
journal, May 2014

A unitary isobar model for pion photo- and electroproduction on the proton up to 1 GeV
journal, January 1999

Forward Charged-Pion Electroproduction from Fixed-Momentum-Transfer Dispersion Relations
journal, May 1970

The High Momentum Spectrometer drift chambers in Hall C at CEBAF
journal, December 1995

Polarization in coincidence electron scattering from nuclei
journal, April 1989

Nucleon tensor charge from exclusive $π^{0}$ electroproduction
journal, March 2009

Deep exclusive charged $π$ electroproduction above the resonance region
journal, April 2010

Hard exclusive electroproduction of pseudoscalar mesons and the QCD axial anomaly
journal, May 1999

Determination of the Pion Charge Form Factor at $Q^{2} = 1.60$ and $2.45 (GeV / c)^{2}$
journal, November 2006

Cross-Section Measurement of Charged-Pion Photoproduction from Hydrogen and Deuterium
journal, July 2003

Factorization for hard exclusive electroproduction of mesons in QCD
journal, September 1997

Exclusive channels in deep inelastic Lepton-Nucleon scattering and the nature of gluons
journal, November 1976

Determination of the pion charge form factor for $Q^{2} =$ 0.60–1.60 GeV $^{2}$
journal, May 2007

Longitudinal Electroproduction of Charged Pions from ${}^{1}H$ , ${}^{2}H$ , and ${}^{3}H e$
journal, October 2001

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

Charged pion form factor between $Q^{2} = 0.60$ and $2.45 GeV^{2}$ . II. Determination of, and results for, the pion form factor
journal, October 2008

Hard exclusive meson production at next-to-leading order
journal, August 2001

Regge description of charged pseudoscalar meson electroproduction above the resonance region
journal, March 1998

Measurement of the Charged Pion Electromagnetic Form Factor
journal, February 2001

Large momentum transfer electroproduction of mesons
journal, November 2000

Radiative corrections for ${(e, e}^{'} p)$ reactions at GeV energies
journal, October 2001