Precision Measurement of the p(e,e'p)π0 Reaction at Threshold

Chirapatpimol, K.; Shabestari, M. H.; Lindgren, R. A.; Smith, L. C.; Annand, J. R. M.; Higinbotham, D. W.; Moffit, B.; Nelyubin, V.; Norum, B. E.; Allada, K.; Aniol, K.; Ardashev, K.; Armstrong, D. S.; Arndt, R. A.; Benmokhtar, F.; Bernstein, A. M.; Bertozzi, W.; Briscoe, W. J.; Bimbot, L.; Camsonne, A.; Chen, J. -P.; Choi, S.; Chudakov, E.; Cisbani, E.; Cusanno, F.; Dalton, M. M.; Dutta, C.; Egiyan, K.; Fernàndez-Ramìrez, C.; Feuerbach, R.; Fissum, K. G.; Frullani, S.; Garibaldi, F.; Gayou, O.; Gilman, R.; Gilad, S.; Goity, J.; Gomez, J.; Hahn, B.; Hamilton, D.; Hansen, J. -O.; Huang, J.; Igarashi, R.; Ireland, D.; de Jager, C. W.; Jin, X.; Jiang, X.; Jinasundera, T.; Kellie, J.; Keppel, C. E.; Kolb, N.; LeRose, J.; Liyanage, N.; Livingston, K.; McNulty, D.; Mercado, L.; Michaels, R.; Mihovilovič, M.; Qian, S.; Qian, X.; Mailyan, S.; Mamyan, V.; Marrone, S.; Monaghan, P.; Nanda, S.; Perdrisat, C. F.; Piasetzky, E.; Protopopescu, D.; Punjabi, V.; Qiang, Y.; Rachek, I. A.; Rakhman, A.; Riordan, S.; Ron, G.; Rosner, G.; Saha, A.; Sawatzky, B.; Shahinyan, A.; Širca, S.; Sparveris, N.; Subedi, R. R.; Suleiman, R.; Strakovsky, I.; Sulkosky, V.; Moinelo, J.; Voskanyan, H.; Wang, K.; Wang, Y.; Watson, J.; Watts, D.; Wojtsekhowski, B.; Workman, R. L.; Yao, H.; Zhan, X.; Zhang, Y.

doi:10.1103/PhysRevLett.114.192503

Title: Precision Measurement of the $p (e, e^{'} p) π^{0}$ Reaction at Threshold

Abstract

New results are reported from a measurement of $$\pi^0$$ electroproduction near threshold using the p(e, e´p) π⁰ reaction. The experiment was designed to determine precisely the energy dependence of $s-$ and $p-$wave electromagnetic multipoles as a stringent test of the predictions of Chiral Perturbation Theory (ChPT). The data were taken with an electron beam energy of 1192 MeV using a two-spectrometer setup in Hall A at Jefferson Lab. For the first time, complete coverage of the $$\phi^*_{\pi}$$ and $$\theta^*_{\pi}$$ angles in the $$p \pi^0$$ center-of-mass was obtained for invariant energies above threshold from 0.5 MeV up to 15 MeV. The 4-momentum transfer $Q^2$ coverage ranges from 0.05 to 0.155 (GeV/c)$^2$ in fine steps. A simple phenomenological analysis of our data shows strong disagreement with $p-$wave predictions from ChPT for $Q^2>0.07$ (GeV/c)$^2$, while the $s-$wave predictions are in reasonable agreement.

Authors:: Chirapatpimol, K.; Shabestari, M. H.; Lindgren, R. A.; Smith, L. C.; Annand, J. R. M.; Higinbotham, D. W.; Moffit, B.; Nelyubin, V.; Norum, B. E.; Allada, K.; Aniol, K.; Ardashev, K.; Armstrong, D. S.; Arndt, R. A.; Benmokhtar, F.; Bernstein, A. M.; Bertozzi, W.; Briscoe, W. J.; Bimbot, L.; Camsonne, A. more »« less

Publication Date:: Wed May 13 00:00:00 EDT 2015

Research Org.:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Univ. of Virginia, Charlottesville, VA (United States)

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

Contributing Org.:: Jefferson Hall A Collaboration

OSTI Identifier:: 1179440

Alternate Identifier(s):: OSTI ID: 1179742; OSTI ID: 1417863

Report Number(s):: JLAB/PHY-15-2013; DOE/OR-23177-3313
Journal ID: ISSN 0031-9007; PRLTAO; FG02-97ER41025; NSF MRI Award No. 021635; JLAB-E04-007; TRN: US1600762

Grant/Contract Number:: FG02-97ER41025; AC05-06OR23177; 021635; SC0014325

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review Letters

Additional Journal Information:: Journal Volume: 114; Journal Issue: 19; 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


                    Chirapatpimol, K., Shabestari, M. H., Lindgren, R. A., Smith, L. C., Annand, J. R. M., Higinbotham, D. W., Moffit, B., Nelyubin, V., Norum, B. E., Allada, K., Aniol, K., Ardashev, K., Armstrong, D. S., Arndt, R. A., Benmokhtar, F., Bernstein, A. M., Bertozzi, W., Briscoe, W. J., Bimbot, L., Camsonne, A., Chen, J. -P., Choi, S., Chudakov, E., Cisbani, E., Cusanno, F., Dalton, M. M., Dutta, C., Egiyan, K., Fernàndez-Ramìrez, C., Feuerbach, R., Fissum, K. G., Frullani, S., Garibaldi, F., Gayou, O., Gilman, R., Gilad, S., Goity, J., Gomez, J., Hahn, B., Hamilton, D., Hansen, J. -O., Huang, J., Igarashi, R., Ireland, D., de Jager, C. W., Jin, X., Jiang, X., Jinasundera, T., Kellie, J., Keppel, C. E., Kolb, N., LeRose, J., Liyanage, N., Livingston, K., McNulty, D., Mercado, L., Michaels, R., Mihovilovič, M., Qian, S., Qian, X., Mailyan, S., Mamyan, V., Marrone, S., Monaghan, P., Nanda, S., Perdrisat, C. F., Piasetzky, E., Protopopescu, D., Punjabi, V., Qiang, Y., Rachek, I. A., Rakhman, A., Riordan, S., Ron, G., Rosner, G., Saha, A., Sawatzky, B., Shahinyan, A., Širca, S., Sparveris, N., Subedi, R. R., Suleiman, R., Strakovsky, I., Sulkosky, V., Moinelo, J., Voskanyan, H., Wang, K., Wang, Y., Watson, J., Watts, D., Wojtsekhowski, B., Workman, R. L., Yao, H., Zhan, X., and Zhang, Y. Precision Measurement of the p(e,e'p)π0 Reaction at Threshold.  United States: N. p., 2015. 
Web.  doi:10.1103/PhysRevLett.114.192503.

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                    Chirapatpimol, K., Shabestari, M. H., Lindgren, R. A., Smith, L. C., Annand, J. R. M., Higinbotham, D. W., Moffit, B., Nelyubin, V., Norum, B. E., Allada, K., Aniol, K., Ardashev, K., Armstrong, D. S., Arndt, R. A., Benmokhtar, F., Bernstein, A. M., Bertozzi, W., Briscoe, W. J., Bimbot, L., Camsonne, A., Chen, J. -P., Choi, S., Chudakov, E., Cisbani, E., Cusanno, F., Dalton, M. M., Dutta, C., Egiyan, K., Fernàndez-Ramìrez, C., Feuerbach, R., Fissum, K. G., Frullani, S., Garibaldi, F., Gayou, O., Gilman, R., Gilad, S., Goity, J., Gomez, J., Hahn, B., Hamilton, D., Hansen, J. -O., Huang, J., Igarashi, R., Ireland, D., de Jager, C. W., Jin, X., Jiang, X., Jinasundera, T., Kellie, J., Keppel, C. E., Kolb, N., LeRose, J., Liyanage, N., Livingston, K., McNulty, D., Mercado, L., Michaels, R., Mihovilovič, M., Qian, S., Qian, X., Mailyan, S., Mamyan, V., Marrone, S., Monaghan, P., Nanda, S., Perdrisat, C. F., Piasetzky, E., Protopopescu, D., Punjabi, V., Qiang, Y., Rachek, I. A., Rakhman, A., Riordan, S., Ron, G., Rosner, G., Saha, A., Sawatzky, B., Shahinyan, A., Širca, S., Sparveris, N., Subedi, R. R., Suleiman, R., Strakovsky, I., Sulkosky, V., Moinelo, J., Voskanyan, H., Wang, K., Wang, Y., Watson, J., Watts, D., Wojtsekhowski, B., Workman, R. L., Yao, H., Zhan, X., & Zhang, Y. Precision Measurement of the p(e,e'p)π0 Reaction at Threshold.  United States.  https://doi.org/10.1103/PhysRevLett.114.192503

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                    Chirapatpimol, K., Shabestari, M. H., Lindgren, R. A., Smith, L. C., Annand, J. R. M., Higinbotham, D. W., Moffit, B., Nelyubin, V., Norum, B. E., Allada, K., Aniol, K., Ardashev, K., Armstrong, D. S., Arndt, R. A., Benmokhtar, F., Bernstein, A. M., Bertozzi, W., Briscoe, W. J., Bimbot, L., Camsonne, A., Chen, J. -P., Choi, S., Chudakov, E., Cisbani, E., Cusanno, F., Dalton, M. M., Dutta, C., Egiyan, K., Fernàndez-Ramìrez, C., Feuerbach, R., Fissum, K. G., Frullani, S., Garibaldi, F., Gayou, O., Gilman, R., Gilad, S., Goity, J., Gomez, J., Hahn, B., Hamilton, D., Hansen, J. -O., Huang, J., Igarashi, R., Ireland, D., de Jager, C. W., Jin, X., Jiang, X., Jinasundera, T., Kellie, J., Keppel, C. E., Kolb, N., LeRose, J., Liyanage, N., Livingston, K., McNulty, D., Mercado, L., Michaels, R., Mihovilovič, M., Qian, S., Qian, X., Mailyan, S., Mamyan, V., Marrone, S., Monaghan, P., Nanda, S., Perdrisat, C. F., Piasetzky, E., Protopopescu, D., Punjabi, V., Qiang, Y., Rachek, I. A., Rakhman, A., Riordan, S., Ron, G., Rosner, G., Saha, A., Sawatzky, B., Shahinyan, A., Širca, S., Sparveris, N., Subedi, R. R., Suleiman, R., Strakovsky, I., Sulkosky, V., Moinelo, J., Voskanyan, H., Wang, K., Wang, Y., Watson, J., Watts, D., Wojtsekhowski, B., Workman, R. L., Yao, H., Zhan, X., and Zhang, Y. Wed .  
"Precision Measurement of the p(e,e'p)π0 Reaction at Threshold".  United States.  https://doi.org/10.1103/PhysRevLett.114.192503.  https://www.osti.gov/servlets/purl/1179440.

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@article{osti_1179440,

  title        = {Precision Measurement of the p(e,e'p)π0 Reaction at Threshold},

  author       = {Chirapatpimol, K. and Shabestari, M. H. and Lindgren, R. A. and Smith, L. C. and Annand, J. R. M. and Higinbotham, D. W. and Moffit, B. and Nelyubin, V. and Norum, B. E. and Allada, K. and Aniol, K. and Ardashev, K. and Armstrong, D. S. and Arndt, R. A. and Benmokhtar, F. and Bernstein, A. M. and Bertozzi, W. and Briscoe, W. J. and Bimbot, L. and Camsonne, A. and Chen, J. -P. and Choi, S. and Chudakov, E. and Cisbani, E. and Cusanno, F. and Dalton, M. M. and Dutta, C. and Egiyan, K. and Fernàndez-Ramìrez, C. and Feuerbach, R. and Fissum, K. G. and Frullani, S. and Garibaldi, F. and Gayou, O. and Gilman, R. and Gilad, S. and Goity, J. and Gomez, J. and Hahn, B. and Hamilton, D. and Hansen, J. -O. and Huang, J. and Igarashi, R. and Ireland, D. and de Jager, C. W. and Jin, X. and Jiang, X. and Jinasundera, T. and Kellie, J. and Keppel, C. E. and Kolb, N. and LeRose, J. and Liyanage, N. and Livingston, K. and McNulty, D. and Mercado, L. and Michaels, R. and Mihovilovič, M. and Qian, S. and Qian, X. and Mailyan, S. and Mamyan, V. and Marrone, S. and Monaghan, P. and Nanda, S. and Perdrisat, C. F. and Piasetzky, E. and Protopopescu, D. and Punjabi, V. and Qiang, Y. and Rachek, I. A. and Rakhman, A. and Riordan, S. and Ron, G. and Rosner, G. and Saha, A. and Sawatzky, B. and Shahinyan, A. and Širca, S. and Sparveris, N. and Subedi, R. R. and Suleiman, R. and Strakovsky, I. and Sulkosky, V. and Moinelo, J. and Voskanyan, H. and Wang, K. and Wang, Y. and Watson, J. and Watts, D. and Wojtsekhowski, B. and Workman, R. L. and Yao, H. and Zhan, X. and Zhang, Y.},

  abstractNote = {New results are reported from a measurement of $\pi^0$ electroproduction near threshold using the p(e, e´p) π⁰ reaction. The experiment was designed to determine precisely the energy dependence of $s-$ and $p-$wave electromagnetic multipoles as a stringent test of the predictions of Chiral Perturbation Theory (ChPT). The data were taken with an electron beam energy of 1192 MeV using a two-spectrometer setup in Hall A at Jefferson Lab. For the first time, complete coverage of the $\phi^*_{\pi}$ and $\theta^*_{\pi}$ angles in the $p \pi^0$ center-of-mass was obtained for invariant energies above threshold from 0.5 MeV up to 15 MeV. The 4-momentum transfer $Q^2$ coverage ranges from 0.05 to 0.155 (GeV/c)$^2$ in fine steps. A simple phenomenological analysis of our data shows strong disagreement with $p-$wave predictions from ChPT for $Q^2>0.07$ (GeV/c)$^2$, while the $s-$wave predictions are in reasonable agreement.},

  doi          = {10.1103/PhysRevLett.114.192503},

  journal      = {Physical Review Letters},

  number       = 19,

  volume       = 114,

  place        = {United States},

  year         = {Wed May 13 00:00:00 EDT 2015},

  month        = {Wed May 13 00:00:00 EDT 2015}

}

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Title: Precision Measurement of the p ( e , e ' p ) π 0 Reaction at Threshold

Abstract

Citation Formats

Upper energy limit of heavy baryon chiral perturbation theory in neutral pion photoproduction journal, July 2013

Methods for optical calibration of the BigBite hadron spectrometer journal, September 2012

Basic instrumentation for Hall A at Jefferson Lab journal, April 2004

Threshold neutral pion electroproduction in heavy baryon chiral perturbation theory journal, September 1996

Neutral-Pion Electroproduction on the Proton near Threshold journal, May 1995

Unitary isobar model --MAID2007 journal, October 2007

Pion photo- and electroproduction in relativistic baryon chiral perturbation theory and the chiral MAID interface journal, November 2013

Chiral Dynamics in Nucleons and Nuclei journal, June 1995

Low-energy analysis of the nucleon electromagnetic form factors journal, January 2001

Baryon resonance analysis from SAID journal, December 2009

Dispersion relation analysis of neutral pion photoproduction and electroproduction at threshold journal, December 2002

Aspects of near-threshold neutral pion photoproduction off protons journal, July 2001

Electroproduction of π 0 on the proton near threshold journal, November 1992

Accurate Test of Chiral Dynamics in the γ → p → π 0 p Reaction journal, August 2013

π0 Photo- and electroproduction at threshold within a dynamical model journal, December 2001

Pion Cloud and the Q 2 Dependence of γ * N ↔ Δ Transition Form Factors journal, November 1999

Measurement of Separated Structure Functions in the p ( e , e ′ p ) π 0 Reaction at Threshold and Chiral Perturbation Theory journal, March 1998

Neutral Pion Threshold Production at Q 2 = 0.05 GeV 2 / c 2 and Chiral Perturbation Theory journal, December 2001

Threshold π 0 photoproduction in relativistic chiral perturbation theory journal, April 2013

Title: Precision Measurement of the $p (e, e^{'} p) π^{0}$ Reaction at Threshold

Upper energy limit of heavy baryon chiral perturbation theory in neutral pion photoproduction
journal, July 2013

Methods for optical calibration of the BigBite hadron spectrometer
journal, September 2012

Basic instrumentation for Hall A at Jefferson Lab
journal, April 2004

Threshold neutral pion electroproduction in heavy baryon chiral perturbation theory
journal, September 1996

Neutral-Pion Electroproduction on the Proton near Threshold
journal, May 1995

Unitary isobar model --MAID2007
journal, October 2007

Pion photo- and electroproduction in relativistic baryon chiral perturbation theory and the chiral MAID interface
journal, November 2013

Chiral Dynamics in Nucleons and Nuclei
journal, June 1995

Low-energy analysis of the nucleon electromagnetic form factors
journal, January 2001

Baryon resonance analysis from SAID
journal, December 2009

Dispersion relation analysis of neutral pion photoproduction and electroproduction at threshold
journal, December 2002

Aspects of near-threshold neutral pion photoproduction off protons
journal, July 2001

Electroproduction of $π^{0}$ on the proton near threshold
journal, November 1992

Accurate Test of Chiral Dynamics in the $\vec{γ} p \to π^{0} p$ Reaction
journal, August 2013

π0 Photo- and electroproduction at threshold within a dynamical model
journal, December 2001

Pion Cloud and the $Q^{2}$ Dependence of $γ^{*} N \leftrightarrow Δ$ Transition Form Factors
journal, November 1999

Measurement of Separated Structure Functions in the $p (e, e^{'} p) π^{0}$ Reaction at Threshold and Chiral Perturbation Theory
journal, March 1998

Neutral Pion Threshold Production at $Q^{2} = 0.05 {GeV}^{2} / c^{2}$ and Chiral Perturbation Theory
journal, December 2001

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journal, April 2013