Polarization Transfer Observables in Elastic Electron-Proton Scattering at Q[superscript 2] = 2.5 , 5.2, 6.8, and 8.5 GeV[superscript 2]
Background: Interest in the behavior of nucleon electromagnetic form factors at large momentum transfers has steadily increased since the discovery, using polarization observables, of the rapid decrease of the ratio G[subscript E][superscript p]/G[subscript M][superscript p] of the proton's ele...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2018
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| Online Access: | http://hdl.handle.net/1721.1/115539 https://orcid.org/0000-0003-2713-7800 |
| _version_ | 1811097111183228928 |
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| author | Puckett, A. J. R. Brash, E. J. Jones, M. K. Luo, W. Meziane, M. Pentchev, L. Perdrisat, C. F. Punjabi, V. Wesselmann, F. R. Afanasev, A. Ahmidouch, A. Albayrak, I. Aniol, K. A. Arrington, J. Asaturyan, A. Baghdasaryan, H. Benmokhtar, F. Bimbot, L. Bosted, P. Boeglin, W. Butuceanu, C. Carter, P. Chernenko, S. Christy, M. E. Commisso, M. Cornejo, J. C. Covrig, S. Danagoulian, S. Daniel, A. Davidenko, A. Day, D. Dhamija, S. Dutta, D. Ent, R. Frullani, S. Fenker, H. Frlez, E. Garibaldi, F. Gaskell, D. Gilman, R. Goncharenko, Y. Hafidi, K. Hamilton, D. Higinbotham, D. W. Hinton, W. Horn, T. Hu, B. Huber, G. M. Jensen, E. Keppel, C. Khandaker, M. King, P. Kirillov, D. Kohl, M. Kravtsov, V. Kumbartzki, G. Li, Y. Mamyan, V. Margaziotis, D. J. Marsh, A. Matulenko, Y. Maxwell, J. Mbianda, G. Meekins, D. Melnik, Y. Miller, J. Mkrtchyan, A. Mkrtchyan, H. Moreno, O. Mulholland, J. Narayan, A. Nedev, S. Nuruzzaman Piasetzky, E. Pierce, W. Piskunov, N. M. Prok, Y. Ransome, R. D. Razin, D. S. Reimer, P. Reinhold, J. Rondon, O. Shabestari, M. Shahinyan, A. Shestermanov, K. Širca, S. Sitnik, I. Smykov, L. Smith, G. Solovyev, L. Solvignon, P. Subedi, R. Tomasi-Gustafsson, E. Vasiliev, A. Veilleux, M. Wojtsekhowski, B. B. Wood, S. Ye, Z. Zanevsky, Y. Zhang, X. Zhang, Y. Zheng, X. Zhu, L. Bertozzi, William Gilad, Shalev Huang, J. Moffit, Bryan J. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Puckett, A. J. R. Brash, E. J. Jones, M. K. Luo, W. Meziane, M. Pentchev, L. Perdrisat, C. F. Punjabi, V. Wesselmann, F. R. Afanasev, A. Ahmidouch, A. Albayrak, I. Aniol, K. A. Arrington, J. Asaturyan, A. Baghdasaryan, H. Benmokhtar, F. Bimbot, L. Bosted, P. Boeglin, W. Butuceanu, C. Carter, P. Chernenko, S. Christy, M. E. Commisso, M. Cornejo, J. C. Covrig, S. Danagoulian, S. Daniel, A. Davidenko, A. Day, D. Dhamija, S. Dutta, D. Ent, R. Frullani, S. Fenker, H. Frlez, E. Garibaldi, F. Gaskell, D. Gilman, R. Goncharenko, Y. Hafidi, K. Hamilton, D. Higinbotham, D. W. Hinton, W. Horn, T. Hu, B. Huber, G. M. Jensen, E. Keppel, C. Khandaker, M. King, P. Kirillov, D. Kohl, M. Kravtsov, V. Kumbartzki, G. Li, Y. Mamyan, V. Margaziotis, D. J. Marsh, A. Matulenko, Y. Maxwell, J. Mbianda, G. Meekins, D. Melnik, Y. Miller, J. Mkrtchyan, A. Mkrtchyan, H. Moreno, O. Mulholland, J. Narayan, A. Nedev, S. Nuruzzaman Piasetzky, E. Pierce, W. Piskunov, N. M. Prok, Y. Ransome, R. D. Razin, D. S. Reimer, P. Reinhold, J. Rondon, O. Shabestari, M. Shahinyan, A. Shestermanov, K. Širca, S. Sitnik, I. Smykov, L. Smith, G. Solovyev, L. Solvignon, P. Subedi, R. Tomasi-Gustafsson, E. Vasiliev, A. Veilleux, M. Wojtsekhowski, B. B. Wood, S. Ye, Z. Zanevsky, Y. Zhang, X. Zhang, Y. Zheng, X. Zhu, L. Bertozzi, William Gilad, Shalev Huang, J. Moffit, Bryan J. |
| author_sort | Puckett, A. J. R. |
| collection | MIT |
| description | Background: Interest in the behavior of nucleon electromagnetic form factors at large momentum transfers has steadily increased since the discovery, using polarization observables, of the rapid decrease of the ratio G[subscript E][superscript p]/G[subscript M][superscript p] of the proton's electric and magnetic form factors for momentum transfers Q[superscript 2]≳1 GeV[superscript 2], in strong disagreement with previous extractions of this ratio using the traditional Rosenbluth separation technique.
Purpose: The GEp-III and GEp-2γ experiments were carried out in Jefferson Laboratory's (JLab's) Hall C from 2007 to 2008, to extend the knowledge of G[subscript E][superscript p]/G[subscript M][superscript p] to the highest practically achievable Q[superscript 2] given the maximum beam energy of 6 GeV and to search for effects beyond the Born approximation in polarization transfer observables of elastic e[over ⃗]p scattering. This article provides an expanded description of the common experimental apparatus and data analysis procedures, and reports the results of a final reanalysis of the data from both experiments, including the previously unpublished results of the full-acceptance dataset of the GEp-2γ experiment.
Methods: Polarization transfer observables in elastic e[over ⃗]p→ep[over ⃗] scattering were measured at central Q[superscript 2} values of 2.5, 5.2, 6.8, and 8.54 GeV[superscript 2]. At Q[superscript 2] = 2.5GeV[superscript 2], data were obtained for central values of the virtual photon polarization parameter ε of 0.149, 0.632, and 0.783. The Hall C High Momentum Spectrometer detected and measured the polarization of protons recoiling elastically from collisions of JLab's polarized electron beam with a liquid hydrogen target. A large-acceptance electromagnetic calorimeter detected the elastically scattered electrons in coincidence to suppress inelastic backgrounds.
Results: The final GEp-III data are largely unchanged relative to the originally published results. The statistical uncertainties of the final GEp-2γ data are significantly reduced at ε=0.632 and 0.783 relative to the original publication.
Conclusions: The final GEp-III results show that the decrease with Q[superscript 2] of G[subscript E][superscript p]/G[subscript M][superscript p] continues to Q[superscript 2]=8.5GeV[superscript 2], but at a slowing rate relative to the approximately linear decrease observed in earlier Hall A measurements. At Q[superscript 2]=8.5GeV[superscript 2], G[subscript E][superscript p]G[subscript M][superscript p] remains positive but is consistent with zero. At Q[superscript 2] = 2.5GeV[superscript 2], G[subscript E][superscript p]G[subscript M][superscript p] derived from the polarization component ratio R∝P[subscript t]/P[subscript ℓ] shows no statistically significant ε dependence, as expected in the Born approximation. On the other hand, the ratio P[subscript ℓ]/P[subscript ℓ][superscript Born] of the longitudinal polarization transfer component to its Born value shows an enhancement of roughly 1.7% at ε=0.783 relative to ε=0.149, with ≈2.2σ significance based on the total uncertainty, implying a similar effect in the transverse component P[subscript t] that cancels in the ratio R. |
| first_indexed | 2024-09-23T16:54:31Z |
| format | Article |
| id | mit-1721.1/115539 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T16:54:31Z |
| publishDate | 2018 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/1155392023-02-26T11:23:17Z Polarization Transfer Observables in Elastic Electron-Proton Scattering at Q[superscript 2] = 2.5 , 5.2, 6.8, and 8.5 GeV[superscript 2] Puckett, A. J. R. Brash, E. J. Jones, M. K. Luo, W. Meziane, M. Pentchev, L. Perdrisat, C. F. Punjabi, V. Wesselmann, F. R. Afanasev, A. Ahmidouch, A. Albayrak, I. Aniol, K. A. Arrington, J. Asaturyan, A. Baghdasaryan, H. Benmokhtar, F. Bimbot, L. Bosted, P. Boeglin, W. Butuceanu, C. Carter, P. Chernenko, S. Christy, M. E. Commisso, M. Cornejo, J. C. Covrig, S. Danagoulian, S. Daniel, A. Davidenko, A. Day, D. Dhamija, S. Dutta, D. Ent, R. Frullani, S. Fenker, H. Frlez, E. Garibaldi, F. Gaskell, D. Gilman, R. Goncharenko, Y. Hafidi, K. Hamilton, D. Higinbotham, D. W. Hinton, W. Horn, T. Hu, B. Huber, G. M. Jensen, E. Keppel, C. Khandaker, M. King, P. Kirillov, D. Kohl, M. Kravtsov, V. Kumbartzki, G. Li, Y. Mamyan, V. Margaziotis, D. J. Marsh, A. Matulenko, Y. Maxwell, J. Mbianda, G. Meekins, D. Melnik, Y. Miller, J. Mkrtchyan, A. Mkrtchyan, H. Moreno, O. Mulholland, J. Narayan, A. Nedev, S. Nuruzzaman Piasetzky, E. Pierce, W. Piskunov, N. M. Prok, Y. Ransome, R. D. Razin, D. S. Reimer, P. Reinhold, J. Rondon, O. Shabestari, M. Shahinyan, A. Shestermanov, K. Širca, S. Sitnik, I. Smykov, L. Smith, G. Solovyev, L. Solvignon, P. Subedi, R. Tomasi-Gustafsson, E. Vasiliev, A. Veilleux, M. Wojtsekhowski, B. B. Wood, S. Ye, Z. Zanevsky, Y. Zhang, X. Zhang, Y. Zheng, X. Zhu, L. Bertozzi, William Gilad, Shalev Huang, J. Moffit, Bryan J. Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Bertozzi, William Gilad, Shalev Huang, J. Moffit, Bryan J Background: Interest in the behavior of nucleon electromagnetic form factors at large momentum transfers has steadily increased since the discovery, using polarization observables, of the rapid decrease of the ratio G[subscript E][superscript p]/G[subscript M][superscript p] of the proton's electric and magnetic form factors for momentum transfers Q[superscript 2]≳1 GeV[superscript 2], in strong disagreement with previous extractions of this ratio using the traditional Rosenbluth separation technique. Purpose: The GEp-III and GEp-2γ experiments were carried out in Jefferson Laboratory's (JLab's) Hall C from 2007 to 2008, to extend the knowledge of G[subscript E][superscript p]/G[subscript M][superscript p] to the highest practically achievable Q[superscript 2] given the maximum beam energy of 6 GeV and to search for effects beyond the Born approximation in polarization transfer observables of elastic e[over ⃗]p scattering. This article provides an expanded description of the common experimental apparatus and data analysis procedures, and reports the results of a final reanalysis of the data from both experiments, including the previously unpublished results of the full-acceptance dataset of the GEp-2γ experiment. Methods: Polarization transfer observables in elastic e[over ⃗]p→ep[over ⃗] scattering were measured at central Q[superscript 2} values of 2.5, 5.2, 6.8, and 8.54 GeV[superscript 2]. At Q[superscript 2] = 2.5GeV[superscript 2], data were obtained for central values of the virtual photon polarization parameter ε of 0.149, 0.632, and 0.783. The Hall C High Momentum Spectrometer detected and measured the polarization of protons recoiling elastically from collisions of JLab's polarized electron beam with a liquid hydrogen target. A large-acceptance electromagnetic calorimeter detected the elastically scattered electrons in coincidence to suppress inelastic backgrounds. Results: The final GEp-III data are largely unchanged relative to the originally published results. The statistical uncertainties of the final GEp-2γ data are significantly reduced at ε=0.632 and 0.783 relative to the original publication. Conclusions: The final GEp-III results show that the decrease with Q[superscript 2] of G[subscript E][superscript p]/G[subscript M][superscript p] continues to Q[superscript 2]=8.5GeV[superscript 2], but at a slowing rate relative to the approximately linear decrease observed in earlier Hall A measurements. At Q[superscript 2]=8.5GeV[superscript 2], G[subscript E][superscript p]G[subscript M][superscript p] remains positive but is consistent with zero. At Q[superscript 2] = 2.5GeV[superscript 2], G[subscript E][superscript p]G[subscript M][superscript p] derived from the polarization component ratio R∝P[subscript t]/P[subscript ℓ] shows no statistically significant ε dependence, as expected in the Born approximation. On the other hand, the ratio P[subscript ℓ]/P[subscript ℓ][superscript Born] of the longitudinal polarization transfer component to its Born value shows an enhancement of roughly 1.7% at ε=0.783 relative to ε=0.149, with ≈2.2σ significance based on the total uncertainty, implying a similar effect in the transverse component P[subscript t] that cancels in the ratio R. 2018-05-21T15:51:03Z 2018-05-21T15:51:03Z 2017-11 2017-07 2017-11-14T22:43:27Z Article http://purl.org/eprint/type/JournalArticle 2469-9985 2469-9993 http://hdl.handle.net/1721.1/115539 Puckett, A. J. R. et al. "Polarization Transfer Observables in Elastic Electron-Proton Scattering at Q[superscript 2] = 2.5 , 5.2, 6.8, and 8.5 GeV[superscript 2]" Physical Review C 96, 5 (November 2017): 055203 © 2017 American Physical Society https://orcid.org/0000-0003-2713-7800 en http://dx.doi.org/10.1103/PhysRevC.96.055203 Physical Review C Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. American Physical Society application/pdf American Physical Society American Physical Society |
| spellingShingle | Puckett, A. J. R. Brash, E. J. Jones, M. K. Luo, W. Meziane, M. Pentchev, L. Perdrisat, C. F. Punjabi, V. Wesselmann, F. R. Afanasev, A. Ahmidouch, A. Albayrak, I. Aniol, K. A. Arrington, J. Asaturyan, A. Baghdasaryan, H. Benmokhtar, F. Bimbot, L. Bosted, P. Boeglin, W. Butuceanu, C. Carter, P. Chernenko, S. Christy, M. E. Commisso, M. Cornejo, J. C. Covrig, S. Danagoulian, S. Daniel, A. Davidenko, A. Day, D. Dhamija, S. Dutta, D. Ent, R. Frullani, S. Fenker, H. Frlez, E. Garibaldi, F. Gaskell, D. Gilman, R. Goncharenko, Y. Hafidi, K. Hamilton, D. Higinbotham, D. W. Hinton, W. Horn, T. Hu, B. Huber, G. M. Jensen, E. Keppel, C. Khandaker, M. King, P. Kirillov, D. Kohl, M. Kravtsov, V. Kumbartzki, G. Li, Y. Mamyan, V. Margaziotis, D. J. Marsh, A. Matulenko, Y. Maxwell, J. Mbianda, G. Meekins, D. Melnik, Y. Miller, J. Mkrtchyan, A. Mkrtchyan, H. Moreno, O. Mulholland, J. Narayan, A. Nedev, S. Nuruzzaman Piasetzky, E. Pierce, W. Piskunov, N. M. Prok, Y. Ransome, R. D. Razin, D. S. Reimer, P. Reinhold, J. Rondon, O. Shabestari, M. Shahinyan, A. Shestermanov, K. Širca, S. Sitnik, I. Smykov, L. Smith, G. Solovyev, L. Solvignon, P. Subedi, R. Tomasi-Gustafsson, E. Vasiliev, A. Veilleux, M. Wojtsekhowski, B. B. Wood, S. Ye, Z. Zanevsky, Y. Zhang, X. Zhang, Y. Zheng, X. Zhu, L. Bertozzi, William Gilad, Shalev Huang, J. Moffit, Bryan J. Polarization Transfer Observables in Elastic Electron-Proton Scattering at Q[superscript 2] = 2.5 , 5.2, 6.8, and 8.5 GeV[superscript 2] |
| title | Polarization Transfer Observables in Elastic Electron-Proton Scattering at Q[superscript 2] = 2.5 , 5.2, 6.8, and 8.5 GeV[superscript 2] |
| title_full | Polarization Transfer Observables in Elastic Electron-Proton Scattering at Q[superscript 2] = 2.5 , 5.2, 6.8, and 8.5 GeV[superscript 2] |
| title_fullStr | Polarization Transfer Observables in Elastic Electron-Proton Scattering at Q[superscript 2] = 2.5 , 5.2, 6.8, and 8.5 GeV[superscript 2] |
| title_full_unstemmed | Polarization Transfer Observables in Elastic Electron-Proton Scattering at Q[superscript 2] = 2.5 , 5.2, 6.8, and 8.5 GeV[superscript 2] |
| title_short | Polarization Transfer Observables in Elastic Electron-Proton Scattering at Q[superscript 2] = 2.5 , 5.2, 6.8, and 8.5 GeV[superscript 2] |
| title_sort | polarization transfer observables in elastic electron proton scattering at q superscript 2 2 5 5 2 6 8 and 8 5 gev superscript 2 |
| url | http://hdl.handle.net/1721.1/115539 https://orcid.org/0000-0003-2713-7800 |
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polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT rondono polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT shabestarim polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT shahinyana polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT shestermanovk polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT sircas polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT sitniki polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT smykovl polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT smithg polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT solovyevl polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT solvignonp polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT subedir polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT tomasigustafssone polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT vasilieva polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT veilleuxm polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT wojtsekhowskibb polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT woods polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT yez polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT zanevskyy polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT zhangx polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT zhangy polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT zhengx polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT zhul polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT bertozziwilliam polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT giladshalev polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT huangj polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 AT moffitbryanj polarizationtransferobservablesinelasticelectronprotonscatteringatqsuperscript2255268and85gevsuperscript2 |