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1. Measurement of the Nucleon F_{2}^{n}/F_{2}^{p} Structure Function Ratio by the Jefferson Lab MARATHON Tritium/Helium-3 Deep Inelastic Scattering Experiment

Author

D, Abrams, H, Albataineh, B S, Aljawrneh, S, Alsalmi, D, Androic, K, Aniol, W, Armstrong, J, Arrington, H, Atac, T, Averett, C Ayerbe, Gayoso, X, Bai, J, Bane, S, Barcus, A, Beck, V, Bellini, H, Bhatt, D, Bhetuwal, D, Biswas, D, Blyth, W, Boeglin, D, Bulumulla, J, Butler, A, Camsonne, M, Carmignotto, J, Castellanos, J-P, Chen, E O, Cohen, S, Covrig, K, Craycraft, R, Cruz-Torres, B, Dongwi, B, Duran, D, Dutta, E, Fuchey, C, Gal, T N, Gautam, S, Gilad, K, Gnanvo, T, Gogami, J, Gomez, C, Gu, A, Habarakada, T, Hague, J-O, Hansen, M, Hattawy, F, Hauenstein, D W, Higinbotham, R J, Holt, E W, Hughes, C, Hyde, H, Ibrahim, S, Jian, S, Joosten, A, Karki, B, Karki, A T, Katramatou, C, Keith, C, Keppel, M, Khachatryan, V, Khachatryan, A, Khanal, A, Kievsky, D, King, P M, King, I, Korover, S A, Kulagin, K S, Kumar, T, Kutz, N, Lashley-Colthirst, S, Li, W, Li, H, Liu, S, Liuti, N, Liyanage, P, Markowitz, R E, McClellan, D, Meekins, S Mey-Tal, Beck, Z-E, Meziani, R, Michaels, M, Mihovilovic, V, Nelyubin, D, Nguyen, Nuruzzaman, M, Nycz, R, Obrecht, M, Olson, V F, Owen, E, Pace, B, Pandey, V, Pandey, M, Paolone, A, Papadopoulou, S, Park, S, Paul, G G, Petratos, R, Petti, E, Piasetzky, R, Pomatsalyuk, S, Premathilake, A J R, Puckett, V, Punjabi, R D, Ransome, M N H, Rashad, P E, Reimer, S, Riordan, J, Roche, G, Salmè, N, Santiesteban, B, Sawatzky, S, Scopetta, A, Schmidt, B, Schmookler, J, Segal, E P, Segarra, A, Shahinyan, S, Širca, N, Sparveris, T, Su, R, Suleiman, H, Szumila-Vance, A S, Tadepalli, L, Tang, W, Tireman, F, Tortorici, G M, Urciuoli, B, Wojtsekhowski, S, Wood, Z H, Ye, Z Y, Ye, and J, Zhang

Abstract

The ratio of the nucleon F_{2} structure functions, F_{2}^{n}/F_{2}^{p}, is determined by the MARATHON experiment from measurements of deep inelastic scattering of electrons from ^{3}H and ^{3}He nuclei. The experiment was performed in the Hall A Facility of Jefferson Lab using two high-resolution spectrometers for electron detection, and a cryogenic target system which included a low-activity tritium cell. The data analysis used a novel technique exploiting the mirror symmetry of the two nuclei, which essentially eliminates many theoretical uncertainties in the extraction of the ratio. The results, which cover the Bjorken scaling variable range 0.19x0.83, represent a significant improvement compared to previous SLAC and Jefferson Lab measurements for the ratio. They are compared to recent theoretical calculations and empirical determinations of the F_{2}^{n}/F_{2}^{p} ratio.

Published
2022

2. Erratum to: Dispersive corrections in elastic electron-nucleus scattering: an investigation in the intermediate energy regime and their impact on the nuclear matter

Author

R. I. Pomatsalyuk, Yannick Rousseau, A. J. R. Puckett, C. E. Hyde, Ishay Pomerantz, A. P. Freyberger, M. Olson, A. Shahinyan, Kent Paschke, Karl Slifer, E. Piasetzky, S. Strauch, X. Jiang, Fatiha Benmokhtar, H. Arenaövel, A. T. Katramatou, J. R. Calarco, H. F. Ibrahim, T. Holmstrom, S. Frullani, Bryan J. Moffit, W.U. Boeglin, F. Cusanno, E. Chudakov, D. G. Meekins, Asghar Askarpour Kabir, Simon Širca, F. Garibaldi, M. H. Shabestari, Ronald Ransome, E. J. Brash, Guy Ron, Z. E. Meziani, R. Shneor, M. Potokar, Yordanka Ilieva, Young Do Oh, Xin Qian, E. Schulte, Whitney Armstrong, B. Craver, L. Coman, J. P. Chen, C. F. Perdrisat, A. J. Sarty, J.-O. Hansen, M. Reyhan, C. Dutta, B. E. Norum, B. Sawatzky, E. Kuchina, J. Dumas, Emily M. McCullough, Bumsung Lee, M. Meziane, J. Song, R. Michaels, B. L. Berman, G. G. Petratos, J. Roche, G. J. Kumbartzki, P. Giuliani, M. Schwamb, Smt Beck, Douglas Higinbotham, M. K. Jones, Ronald Gilman, Pete Markowitz, Michael Paolone, A. Adeyemi, A. Beck, Yujie Qiang, P. Solvignon, E. Khrosinkova, S. Choi, J. Arrington, Kalyan Allada, R. J. Feuerbach, Alexandre Camsonne, R. A. Lindgren, J. J. LeRose, Punjabi, Paul Gueye, A. Kelleher, and J. Glister

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Hardware_MEMORYSTRUCTURES, medicine.anatomical_structure, Intermediate energy, Scattering, ComputingMethodologies_DOCUMENTANDTEXTPROCESSING, medicine, Elastic electron, Nuclear matter, Nucleus
Abstract

In the original PDF online version of this article, the references 22–26 were missing.These are the missing references.

Published
2020

3. Probing Few-Body Nuclear Dynamics via H3 and He3 (e,e′p)pn Cross-Section Measurements

Author

M. Mihovilovic, Bogdan Wojtsekhowski, Darko Androić, D. Blyth, R. I. Pomatsalyuk, R. Obrecht, Andrew Puckett, Toshiyuki Gogami, Shalev Gilad, H. F. Ibrahim, B. Karki, Dipangkar Dutta, J. Castellanos, N. Santiesteban, Afroditi Papadopoulou, Pete Markowitz, M. Duer, Misak Sargsian, J. Arrington, M. Khachatryan, K. A. Aniol, S. Alsalmi, Nikolaos Sparveris, W. Tireman, Henryk Witała, Z. E. Meziani, J. P. Chen, Siyu Jian, T. Gautam, A. Karki, P. E. Reimer, H. Bhatt, I. Korover, R. Cruz-Torres, Nilanga Liyanage, C. Ayerbe Gayoso, V. Bellini, M. N. H. Rashad, G. M. Urciuoli, S. Covrig, Elliot Hughes, Z. Ye, S. Mey-Tal Beck, B. Schmookler, L. Ou, Weidong Li, J. Gomez, Simon Širca, B. Pandey, H. Albataineh, S. Barcus, S. Premathilake, E. Piasetzky, Ronald Ransome, D. Nguyen, Or Hen, Vladimir Nelyubin, Shanfeng Li, A. Beck, A. Camsonne, E. Fuchey, A. S. Tadepalli, Jacek Golak, P. M. King, T. Averett, D. G. Meekins, A. T. Katramatou, A. Shahinyan, Alexander Schmidt, N. Nuruzzaman, C. E. Hyde, R. E. McClellan, T. Kutz, Larry Weinstein, F. Hauenstein, Sylvester Joosten, S. A. Wood, G. Laskaris, W. U. Boeglin, D. Bulumulla, D. Biswas, F. Tortorici, Olfred Hansen, J. Roche, G. G. Petratos, L. Tang, Fatiha Benmokhtar, H. Atac, R. Skibiński, Kondo Gnanvo, Aditya R. Khanal, M. Nycz, D. Abrams, Cynthia Keppel, X. Bai, S. Park, H. Szumila-Vance, B. Duran, E.P. Segarra, S. Riordan, V. Khachatryan, V. A. Punjabi, C. Gu, Vishvas Pandey, T. Hague, D. King, M. Hattawy, D. Bhetuwal, Eliahu Cohen, R. Michaels, Hongjun Liu, M. Olson, M. Patsyuk, Kacper Topolnicki, B. Sawatzky, N. Lashley-Colthirst, Jiawen Zhang, Whitney Armstrong, S. Paul, T. Su, B. Dongwi, Hiroyuki Kamada, Douglas Higinbotham, V. Owen, J. Bane, C. Gal, A. Habarakada, Riad Suleiman, and K. Craycraft

Subjects
Physics, Scattering, Isoscalar, Nuclear Theory, Momentum transfer, General Physics and Astronomy, Few-body systems, 01 natural sciences, Nuclear physics, Cover (topology), 0103 physical sciences, Nuclear force, Nuclear Experiment, 010306 general physics, Ground state, Nucleon
Abstract

We report the first measurement of the (e,e^{'}p) three-body breakup reaction cross sections in helium-3 (^{3}He) and tritium (^{3}H) at large momentum transfer [⟨Q^{2}⟩≈1.9 (GeV/c)^{2}] and x_{B}>1 kinematics, where the cross section should be sensitive to quasielastic (QE) scattering from single nucleons. The data cover missing momenta 40≤p_{miss}≤500 MeV/c that, in the QE limit with no rescattering, equals the initial momentum of the probed nucleon. The measured cross sections are compared with state-of-the-art ab initio calculations. Overall good agreement, within ±20%, is observed between data and calculations for the full p_{miss} range for ^{3}H and for 100≤p_{miss}≤350 MeV/c for ^{3}He. Including the effects of rescattering of the outgoing nucleon improves agreement with the data at p_{miss}>250 MeV/c and suggests contributions from charge-exchange (SCX) rescattering. The isoscalar sum of ^{3}He plus ^{3}H, which is largely insensitive to SCX, is described by calculations to within the accuracy of the data over the entire p_{miss} range. This validates current models of the ground state of the three-nucleon system up to very high initial nucleon momenta of 500 MeV/c.

Published
2020

4. Probing few-body nuclear dynamics via ^{3}H and ^{3}He (e, {e}'p)pn cross-section measurements

Author

R, Cruz-Torres, D, Nguyen, F, Hauenstein, A, Schmidt, S, Li, D, Abrams, H, Albataineh, S, Alsalmi, D, Androic, K, Aniol, W, Armstrong, J, Arrington, H, Atac, T, Averett, C, Ayerbe Gayoso, X, Bai, J, Bane, S, Barcus, A, Beck, V, Bellini, F, Benmokhtar, H, Bhatt, D, Bhetuwal, D, Biswas, D, Blyth, W, Boeglin, D, Bulumulla, A, Camsonne, J, Castellanos, J-P, Chen, E O, Cohen, S, Covrig, K, Craycraft, B, Dongwi, M, Duer, B, Duran, D, Dutta, E, Fuchey, C, Gal, T N, Gautam, S, Gilad, K, Gnanvo, T, Gogami, J, Golak, J, Gomez, C, Gu, A, Habarakada, T, Hague, O, Hansen, M, Hattawy, O, Hen, D W, Higinbotham, E, Hughes, C, Hyde, H, Ibrahim, S, Jian, S, Joosten, H, Kamada, A, Karki, B, Karki, A T, Katramatou, C, Keppel, M, Khachatryan, V, Khachatryan, A, Khanal, D, King, P, King, I, Korover, T, Kutz, N, Lashley-Colthirst, G, Laskaris, W, Li, H, Liu, N, Liyanage, P, Markowitz, R E, McClellan, D, Meekins, S, Mey-Tal Beck, Z-E, Meziani, R, Michaels, M, Mihovilovič, V, Nelyubin, N, Nuruzzaman, M, Nycz, R, Obrecht, M, Olson, L, Ou, V, Owen, B, Pandey, V, Pandey, A, Papadopoulou, S, Park, M, Patsyuk, S, Paul, G G, Petratos, E, Piasetzky, R, Pomatsalyuk, S, Premathilake, A J R, Puckett, V, Punjabi, R, Ransome, M N H, Rashad, P E, Reimer, S, Riordan, J, Roche, M, Sargsian, N, Santiesteban, B, Sawatzky, E P, Segarra, B, Schmookler, A, Shahinyan, S, Širca, R, Skibiński, N, Sparveris, T, Su, R, Suleiman, H, Szumila-Vance, A S, Tadepalli, L, Tang, W, Tireman, K, Topolnicki, F, Tortorici, G, Urciuoli, L B, Weinstein, H, Witała, B, Wojtsekhowski, S, Wood, Z H, Ye, Z Y, Ye, and J, Zhang

Abstract

We report the first measurement of the (e,e^{'}p) three-body breakup reaction cross sections in helium-3 (^{3}He) and tritium (^{3}H) at large momentum transfer [⟨Q^{2}⟩≈1.9 (GeV/c)^{2}] and x_{B}1 kinematics, where the cross section should be sensitive to quasielastic (QE) scattering from single nucleons. The data cover missing momenta 40≤p_{miss}≤500 MeV/c that, in the QE limit with no rescattering, equals the initial momentum of the probed nucleon. The measured cross sections are compared with state-of-the-art ab initio calculations. Overall good agreement, within ±20%, is observed between data and calculations for the full p_{miss} range for ^{3}H and for 100≤p_{miss}≤350 MeV/c for ^{3}He. Including the effects of rescattering of the outgoing nucleon improves agreement with the data at p_{miss}250 MeV/c and suggests contributions from charge-exchange (SCX) rescattering. The isoscalar sum of ^{3}He plus ^{3}H, which is largely insensitive to SCX, is described by calculations to within the accuracy of the data over the entire p_{miss} range. This validates current models of the ground state of the three-nucleon system up to very high initial nucleon momenta of 500 MeV/c.

Published
2020

5. Dispersive corrections in elastic electron-nucleus scattering: an investigation in the intermediate energy regime and their impact on the nuclear matter

Author

L. Coman, Karl Slifer, E. Schulte, Guy Ron, P. Solvignon, S. May-Tal Beck, J. Song, R. Subedi, E. Piasetzky, R. Michaels, C. F. Perdrisat, B. Craver, Young Do Oh, M. Olson, P. Gueye, C. E. Hyde, G. G. Petratos, V. A. Punjabi, E. McCullough, G. M. Urciuoli, Asghar Askarpour Kabir, Pete Markowitz, A. Kelleher, Ronald Ransome, Ishay Pomerantz, J. J. LeRose, M. Potokar, A. J. Sarty, A. J. R. Puckett, R. Pomatsalyuk, J. Dumas, Xin Qian, C. Dutta, H. F. Ibrahim, A. P. Freyberger, R. Lindgren, M. Meziane, Kent Paschke, A. Shahinyan, B. Sawatzky, E. Kuchina, R. Sparks, Xiaofeng Zhu, S. Strauch, D. G. Meekins, B. L. Berman, F. Cusanno, Z. E. Meziani, A. T. Katramatou, J. Glister, T. Holmstrom, X. Yan, R. J. Feuerbach, J. Arrington, E. Chudakov, Y. Qiang, Fatiha Benmokhtar, B. E. Norum, H. Arenaövel, M. Paolone, J. O. Hansen, J. Roche, W. U. Boeglin, Bryan J. Moffit, A. Camsonne, Franco Garibaldi, H. Yao, M. Schwamb, Byounghoon Lee, Simon Širca, X. Zhan, S. Choi, X. Jiang, R. Shneor, Whitney Armstrong, Kalyan Allada, E. J. Brash, G. J. Kumbartzki, P. Giuliani, Y. Ilieva, M. H. Shabestari, A. Beck, M. Reyhan, Salvatore Frullani, Ronald Gilman, J. P. Chen, Douglas Higinbotham, M. K. Jones, J. R. Calarco, Yannick Rousseau, K. Wang, A. Adeyemi, Bogdan Wojtsekhowski, E. Khrosinkova, Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Jefferson Lab Hall A, and Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Diffraction, Elastic scattering, Physics, Nuclear and High Energy Physics, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear matter, 01 natural sciences, 7. Clean energy, Effective nuclear charge, Cross section (physics), 0103 physical sciences, Nuclear fusion, Atomic physics, Born approximation, 010306 general physics
Abstract

Measurements of elastic electron scattering data within the past decade have highlighted two-photon exchange contributions as a necessary ingredient in theoretical calculations to precisely evaluate hydrogen elastic scattering cross sections. This correction can modify the cross section at the few percent level. In contrast, dispersive effects can cause significantly larger changes from the Born approximation. The purpose of this experiment is to extract the carbon-12 elastic cross section around the first diffraction minimum, where the Born term contributions to the cross section are small to maximize the sensitivity to dispersive effects. The analysis uses the LEDEX data from the high resolution Jefferson Lab Hall A spectrometers to extract the cross sections near the first diffraction minimum of $$^{12}$$ C at beam energies of 362 MeV and 685 MeV. The results are in very good agreement with previous world data, although with less precision. The average deviation from a static nuclear charge distribution expected from linear and quadratic fits indicate a 30.6% contribution of dispersive effects to the cross section at 1 GeV. The magnitude of the dispersive effects near the first diffraction minimum of $$^{12}$$ C has been confirmed to be large with a strong energy dependence and could account for a large fraction of the magnitude for the observed quenching of the longitudinal nuclear response. These effects could also be important for nuclei radii extracted from parity-violating asymmetries measured near a diffraction minimum.

Published
2020

6. Comparing proton momentum distributions in A = 2 and 3 nuclei via 2H 3H and 3He (e,e′p) measurements

Author

Z. Ye, B. Schmookler, J. P. Chen, G. M. Urciuoli, Diego Lonardoni, P. M. King, Hongbang Liu, R. Michaels, D. King, M. Olson, Darko Androić, S. Covrig, Toshiyuki Gogami, Pete Markowitz, S. Paul, Weidong Li, M. Viviani, Whitney Armstrong, P. E. Reimer, Larry Weinstein, T. Su, M. Patsyuk, H. Atac, B. Dongwi, Or Hen, N. Santiesteban, B. Sawatzky, T. Kutz, V. Bellini, R. I. Pomatsalyuk, H. Bhatt, I. Korover, S. A. Wood, R. Obrecht, S. Riordan, V. Pandey, E. Fuchey, Shanfeng Li, A. Beck, M. Hattawy, John Arrington, S. Mey-Tal Beck, Andrew Puckett, D. Bulumulla, Bogdan Wojtsekhowski, Aditya R. Khanal, F. Hauenstein, Simon Širca, A. Shahinyan, M. N. H. Rashad, Axel Schmidt, Cynthia Keppel, M. Khachatryan, J. Gomez, N. Lashley-Colthirst, D. Blyth, J. Castellanos, Ruprecht Machleidt, R. Suleiman, H. Albataineh, D. Bhetuwal, V. Khachatryan, Kondo Gnanvo, Eliahu Cohen, F. Tortorici, J. Roche, V. A. Punjabi, N. Nuruzzaman, S. Alsalmi, M. Nycz, H. Szumila-Vance, B. Duran, G. G. Petratos, Z. E. Meziani, C. Gal, Vladimir Nelyubin, G. Laskaris, L. Tang, W. Tireman, M. Mihovilovic, A. Karki, Ronald Ransome, D. G. Meekins, A. T. Katramatou, Olfred Hansen, W. U. Boeglin, Nilanga Liyanage, D. Biswas, C. Ayerbe Gayoso, Jiawen Zhang, S. Premathilake, D. Nguyen, X. Bai, E.P. Segarra, Siyu Jian, Elliot Hughes, R. Cruz-Torres, Douglas Higinbotham, L. Ou, S. Barcus, V. Owen, J. Bane, A. S. Tadepalli, R. E. McClellan, A. Habarakada, Sylvester Joosten, K. Craycraft, H. F. Ibrahim, B. Karki, Dipangkar Dutta, Laura Elisa Marcucci, M. Duer, T. Gautam, B. Pandey, Shalev Gilad, A. Papadopoulou, K. A. Aniol, A. Camsonne, D. Abrams, S. Park, F. Sammarruca, N. Sparveris, E. Piasetzky, C. Gu, T. Hague, T. Averett, and C. E. Hyde

Subjects
production [pi], Nuclear and High Energy Physics, data analysis method, Photon, Nuclear Theory, interference, FOS: Physical sciences, Electron, Impulse (physics), Inelastic scattering, 01 natural sciences, xperimental results | Jefferson Lab | electron p: scattering | parity: violation | inelastic scattering | structure function | interference | photon | Z0 | pi: production | spin: asymmetry | data analysis method, Nuclear Theory (nucl-th), structure function, 0103 physical sciences, Z0, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Physics, 010308 nuclear & particles physics, Momentum transfer, photon, inelastic scattering, scattering [electron p], Eikonal approximation, NATURAL SCIENCES. Physics, lcsh:QC1-999, PRIRODNE ZNANOSTI. Fizika, Deuterium, xperimental results, High Energy Physics::Experiment, violation [parity], Atomic physics, Nucleon, asymmetry [spin], lcsh:Physics, Jefferson Lab
Abstract

We report the first measurement of the $(e,e'p)$ reaction cross-section ratios for Helium-3 ($^3$He), Tritium ($^3$H), and Deuterium ($d$). The measurement covered a missing momentum range of $40 \le p_{miss} \le 550$ MeV$/c$, at large momentum transfer ($\langle Q^2 \rangle \approx 1.9$ (GeV$/c$)$^2$) and $x_B>1$, which minimized contributions from non quasi-elastic (QE) reaction mechanisms. The data is compared with plane-wave impulse approximation (PWIA) calculations using realistic spectral functions and momentum distributions. The measured and PWIA-calculated cross-section ratios for $^3$He$/d$ and $^3$H$/d$ extend to just above the typical nucleon Fermi-momentum ($k_F \approx 250$ MeV$/c$) and differ from each other by $\sim 20\%$, while for $^3$He/$^3$H they agree within the measurement accuracy of about 3\%. At momenta above $k_F$, the measured $^3$He/$^3$H ratios differ from the calculation by $20\% - 50\%$. Final state interaction (FSI) calculations using the generalized Eikonal Approximation indicate that FSI should change the $^3$He/$^3$H cross-section ratio for this measurement by less than 5\%. If these calculations are correct, then the differences at large missing momenta between the $^3$He/$^3$H experimental and calculated ratios could be due to the underlying $NN$ interaction, and thus could provide new constraints on the previously loosely-constrained short-distance parts of the $NN$ interaction., 8 pages, 3 figures (4 panels)

Published
2019

7. JLab Measurements of the He3 Form Factors at Large Momentum Transfers

Author

S. Choi, J. Arrington, Kalyan Allada, A. Kelleher, P. Decowski, Ronald Gilman, Pete Markowitz, Riad Suleiman, M. H. Shabestari, H. Yao, B. Craver, L. Y. Zhu, Yingxiao Wang, B. D. Anderson, O. Rondon, R. A. Lindgren, J. J. LeRose, Bogdan Wojtsekhowski, J. P. Chen, G. J. Kumbartzki, G. Lott, B. Hahn, V. Sulkosky, J. Huang, G. M. Urciuoli, Douglas Higinbotham, Alexandre Camsonne, D. J. Margaziotis, A. Acha, X. Zheng, Bryan J. Moffit, J.-O. Hansen, B. E. Norum, R. Subedi, E. Chudakov, J. A. Gomez, S. Marrone, F. Garibaldi, C. Dutta, X. Yan, Z. E. Meziani, L. E. Marcucci, Houbing Lu, Mauro Iodice, Xin Qian, W. M. Zhang, A. Kievsky, G. G. Petratos, A. R. Baldwin, Michele Viviani, E. Folts, A. Shahinyan, S. Frullani, P. Solvignon, E. Khrosinkova, A. T. Katramatou, A. Saha, J. Segal, E. Cisbani, A. J. R. Puckett, M. Olson, D. G. Meekins, T. Holmstrom, Bumsung Lee, R. Michaels, B. Sawatzky, E. Kuchina, Nikos Sparveris, and X. Jiang

Subjects
Diffraction, Physics, 010308 nuclear & particles physics, Scattering, Form factor (quantum field theory), General Physics and Astronomy, Charge (physics), Electron, 01 natural sciences, Momentum, Nuclear physics, Recoil, 0103 physical sciences, Magnetic form factor, Nuclear Experiment, 010306 general physics
Abstract

The charge and magnetic form factors, FC and FM, of 3He have been extracted in the kinematic range 25 fm-2 < Q2 < 61 fm-2 from elastic electron scattering by detecting 3He recoil nuclei and electrons in coincidence with the High Resolution Spectrometers of the Hall A Facility at Jefferson Lab. The measurements are indicative of a second diffraction minimum for the magnetic form factor, which was predicted in the Q2 range of this experiment, and of a continuing diffractive structure for the charge form factor. The data are in qualitative agreement with theoretical calculations based on realistic interactions and accurate methods to solve the three-body nuclear problem.

Published
2017

8. JLab Measurement of theHe4Charge Form Factor at Large Momentum Transfers

Author

A. Saha, Bogdan Wojtsekhowski, B. Moffit, J. Segal, T. Holmstrom, E. Kuchina, S. Frullani, Douglas Higinbotham, A. J. R. Puckett, Bumsung Lee, H. Yao, F. Garibaldi, R. Subedi, H. J. Lu, G. Lott, M. H. Shabestari, R. Michaels, M. Olson, E. Cisbani, B. Craver, S. Marrone, C. Dutta, A. Kievsky, E. Folts, Pete Markowitz, John Arrington, A. R. Baldwin, B. D. Anderson, R. A. Lindgren, W. M. Zhang, L. Zhu, B. E. Norum, R. Suleiman, A. Shahinyan, J. J. LeRose, J. P. Chen, A. Acha, D. J. Margaziotis, J. Huang, B. Hahn, S. Choi, E. Khrosinkova, P. Solvignon, E. Chudakov, Kalyan Allada, J. O. Hansen, X. Yan, Yingxiao Wang, Ronald Gilman, B. Sawatzky, G. Kumbartzki, G. G. Petratos, G. M. Urciuoli, Z. E. Meziani, A. Camsonne, J. Gomez, Michele Viviani, P. Decowski, X. Zheng, Nikolaos Sparveris, A. Kelleher, Sulkosky, M. Iodice, L. E. Marcucci, X. Jiang, O. Rondon, Xin Qian, D. G. Meekins, and A. T. Katramatou

Subjects
Physics, Elastic scattering, Nuclear reaction, Operator (physics), Nuclear Theory, Momentum transfer, Form factor (quantum field theory), General Physics and Astronomy, Observable, 7. Clean energy, Momentum, Nuclear physics, Nuclear Experiment, Wave function
Abstract

The electromagnetic (EM) form factors of the heliumisotopes are, along with the deuteron and tritium formfactors, the \observables of choice" [1] for testing thenucleon-meson standard model of the nuclear interac-tion and the associated EM current operator [2]. Theyprovide fundamental information on the internal struc-ture and dynamics of the light nuclei as they are, in asimple picture, convolutions of the ground state wavefunction with the EM form factors of the constituentnucleons. The theoretical calculations for these few-body observables are very sensitive to the model used forthe nuclear EM current operator, especially its meson-exchange-current (MEC) contributions. Relativistic cor-rections and possible admixtures of multi-quark states inthe nuclear wave function might also be relevant [2]. Ad-ditionally, at large momentum transfers, these EM formfactors may o er a unique opportunity to uncover a pos-sible transition in the description of elastic electron scat-tering on few-body nuclear systems, from meson-nucleonto quark-gluon degrees of freedom, as predicted by quark-dimensional scaling [3, 4].Experimentally, the few-body form factors are deter-mined from elastic electron-nucleus scattering studies us-ing high intensity beams, high density targets and large

Published
2014

9. Dynamics of the16O(e,e′p)Reaction at High Missing Energies

Author

C. Cavata, A. Soldi, A. J. Sarty, Y. Roblin, Paul Souder, T. Pussieux, K. Wijesooriya, Ronald Ransome, S. Malov, Shalev Gilad, E. Burtin, M. Liang, C. W. de Jager, K. A. Aniol, M. Holtrop, E. A.J.M. Offermann, Wolfgang Korsch, B. Doyle, G. Quéméner, P. Djawotho, T. Terasawa, Vincent Breton, A. Gasparian, A. V. Glamazdin, K. Joo, D. Rowntree, R. Holmes, C. R. Howell, D. M. Manley, J. R. Calarco, R. W. Lourie, O. Ravel, J. W. Watson, Justin I. McIntyre, J. Gao, E. J. Brash, W. U. Boeglin, B. D. Anderson, G. J. Lolos, M. B. Epstein, G. M. Urciuoli, J. A. Templon, W. Kahl, C. E. Hyde-Wright, S. Kerhoas, A. Serdarevic-Offermann, N. d'Hose, F. T. Baker, C. F. Perdrisat, S. Platchkov, Kazushige Maeda, A. Deur, G. M. Huber, T. Saito, J. Martino, L. Auerbach, Bogdan Wojtsekhowski, J. Domingo, J. Berthot, J. Y. Mougey, R. I. Pomatsalyuk, A. Saha, L. Bimbot, H. Ueno, Kevin Fissum, Z. Papandreou, T. P. Smith, Jian-Ping Chen, L. Todor, A. Leone, James J. Kelly, Seigo Kato, P.Y. Bertin, Nilanga Liyanage, G. Rutledge, Hiroaki Tsubota, Z. L. Zhou, Richard Wilson, Branislav Vlahovic, H. Fonvieille, Gordon D. Cates, Mauro Iodice, Larry Weinstein, G. Laveissière, R. Suleiman, E. Cisbani, William Bertozzi, S. Nanda, G. Kumbartzki, Jing Zhao, R. Madey, D. G. Zainea, Ronald Gilman, R. Roche, D. S. Dale, K. McCormick, R. Michaels, L. Cardman, P. E. Ulmer, V. Zeps, S. van Verst, Pete Markowitz, J. M. Finn, S. Jaminion, H. Breuer, J. Gomez, J.E. Ducret, M. Khandaker, R. A. Lindgren, J. J. LeRose, M. Khayat, H. Voskanyan, C. Jutier, D. Neyret, V. Gorbenko, Roberto Perrino, R. De Leo, F. W. Hersman, L. A. Ewell, B. Diederich, Laird Kramer, M. K. Jones, G. G. Petratos, J. S. McCarthy, T. P. Gorringe, Z. E. Meziani, P. M. Rutt, Leonid Levchuk, David L. Prout, F. Garibaldi, V. A. Punjabi, S. Frullani, P. Vernin, R. L.J. van der Meer, D. J. Margaziotis, C. C. Chang, K. S. Kumar, Pavel Sorokin, K. Kino, B. Frois, and Charles Glashausser

Subjects
Physics, Proton, 010308 nuclear & particles physics, Nuclear Theory, General Physics and Astronomy, 01 natural sciences, Nuclear physics, Cross section (geometry), Pion, 0103 physical sciences, Isobar, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

We measured the cross section and response functions for the quasielastic 16O(e,e'p) reaction for missing energies 25< or =E(m)< or =120 MeV at missing momenta P(m)< or =340 MeV/c. For 25

Published
2001

10. Neutron structure function and A=3 mirror nuclei

Author

F. Bissey, Wally Melnitchouk, I. R. Afnan, G. G. Petratos, A. T. Katramatou, Anthony W. Thomas, and J. Gomez

Subjects
Nuclear and High Energy Physics, Nuclear Theory, FOS: Physical sciences, 01 natural sciences, High Energy Physics - Experiment, Convolution, Nuclear Theory (nucl-th), High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, Neutron, Mirror nuclei, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Wave function, Physics, 010308 nuclear & particles physics, Scattering, Deep inelastic scattering, Computational physics, High Energy Physics - Phenomenology, Nucleon, Fermi Gamma-ray Space Telescope
Abstract

We investigate deep inelastic scattering from He-3 and H-3 within a conventional convolution treatment of binding and Fermi motion effects. Using realistic Faddeev wave functions together with a nucleon spectral function, we demonstrate that the free neutron structure function can be extracted in deep-inelastic scattering from A=3 mirror nuclei, with nuclear effects canceling to within 2% for x < 0.85., 13 pages, 4 figures, version to appear in Phys. Lett. B

Published
2000

11. Transverse AsymmetryAT′from the Quasielastic3He→(e→,e′)Process and the Neutron Magnetic Form Factor

Author

J. Yeh, B. W. Filippone, William Bertozzi, Wolfgang Korsch, K. McIlhany, K. McCormick, M. Schnee, K. Kramer, L. Todor, T. Pavlin, R. I. Pomatsalyuk, L. Cardman, Jacek Golak, Nilanga Liyanage, F. W. Hersman, Branislav Vlahovic, R. Suleiman, A. Deur, Steffen Strauch, R. D. McKeown, J. O. Hansen, D. J. Margaziotis, J. Gomez, Bogdan Wojtsekhowski, Jian-Ping Chen, T. Averett, Charles Glashausser, de Jager Cw, Y. Roblin, D. Pripstein, W. Xu, J. S. Jensen, M. Sutter, I. K. Kominis, M. Liang, C. Crawford, Hiroyuki Kamada, Dipanwita Dutta, W. Glöckle, A. V. Glamazdin, Z. Chai, M. Viviani, Sebastien Incerti, C. F. Williamson, Gordon D. Cates, E. Lakuriqi, F. Xiong, B. Humensky, E. W. Hughes, Henryk Witała, G. G. Petratos, R. Michaels, B. D. Anderson, E. Pace, J. W. Watson, D. S. Dale, Jones Ce, Z. E. Meziani, B. Tipton, Ronald Ransome, G. S. Corrado, L. Auberbach, J. J. LeRose, A. Kievsky, V. Gorbenko, T. Black, Xin Jiang, R. Holmes, R. Kahl, D. W. Higinbotham, G. Salme, S. Churchwell, P. A. Zolnierczuk, J. M. Finn, G. Kumbartzki, C. R. Howell, J. R. Calarco, E. Chudakov, P. Djawotho, Karl Slifer, Haiyan Gao, Paul Souder, T. Shin, M. Rvachev, J. W. Martin, Seonho Choi, S. Malov, Ronald Gilman, M. K. Jones, A. Saha, G. W. Miller, M. Kuss, and David L. Prout

Subjects
Nuclear physics, Physics, Transverse plane, Quasielastic scattering, Experimental uncertainty analysis, media_common.quotation_subject, Magnetic form factor, General Physics and Astronomy, Neutron, Asymmetry, Polarized target, media_common
Abstract

We have measured the transverse asymmetry A_T′ in ^3He(e,e′) quasielastic scattering in Hall A at Jefferson Laboratory with high precision for Q^2 values from 0.1 to 0.6 (GeV/c)^2. The neutron magnetic form factor GMn was extracted based on Faddeev calculations for Q^2 = 0.1 and 0.2 (GeV/c)^2 with an experimental uncertainty of less than 2%.

Published
2000

12. Dynamical Relativistic Effects in Quasielastic1p-Shell Proton Knockout fromO16

Author

C. E. Hyde-Wright, D. J. Margaziotis, J. Martino, Nilanga Liyanage, C. R. Howell, K. Kino, M. Liang, Richard Wilson, J. R. Calarco, G. Quéméner, T. P. Smith, A. V. Glamazdin, Kazushige Maeda, Branislav Vlahovic, R. Suleiman, E. Cisbani, G. M. Urciuoli, K. Joo, S. Frullani, R. W. Lourie, R. Roche, S. Platchkov, D. Rowntree, Paul Souder, Y. Roblin, T. Terasawa, Vincent Breton, Bogdan Wojtsekhowski, W. Kahl, P. Vernin, T. Pussieux, J. M. Finn, J. Gao, J. Gomez, C. F. Perdrisat, B. Frois, Jian-Ping Chen, K. Wijesooriya, W. Korsh, O. Ravel, Hiroaki Tsubota, Ronald Ransome, Seigo Kato, R. L.J. van der Meer, S. Malov, E. Burtin, J. A. Templon, S. Kerhoas, J. W. Watson, M. Holtrop, B. Doyle, S. van Verst, R. Holmes, Z. Papandreou, R. A. Lindgren, J. J. LeRose, H. Voskanyan, C. Jutier, P. M. Rutt, A. Gasparian, G. Rutledge, F. T. Baker, G. M. Huber, David L. Prout, V. Gorbenko, M. Khayat, Charles Glashausser, B. D. Anderson, G. J. Lolos, M. B. Epstein, Mauro Iodice, L. Auerbach, A. Saha, H. Ueno, L. Todor, A. Leone, J. Berthot, Larry Weinstein, William Bertozzi, D. S. Dale, L. Cardman, S. Jaminion, Pete Markowitz, L. Bimbot, G. G. Petratos, Z. E. Meziani, M. Khandaker, V. Zeps, W. U. Boeglin, Leonid Levchuk, Roberto Perrino, R. De Leo, D. Neyret, V. A. Punjabi, B. Diederich, D. G. Zainea, C. C. Chang, K. S. Kumar, T. Saito, Pavel Sorokin, H. Fonvieille, G. Kumbartzki, J. Y. Mougey, F. Garibaldi, T. P. Gorringe, P. E. Ulmer, Z. L. Zhou, G. Laveissière, J. S. McCarthy, P. Djawotho, P.Y. Bertin, J.E. Ducret, Ronald Gilman, K. McCormick, M. K. Jones, A. Serdarevic-Offermann, A. Deur, H. Breuer, F. W. Hersman, L. A. Ewell, James J. Kelly, R. I. Pomatsalyuk, S. Nanda, Shalev Gilad, D. M. Manley, C. W. de Jager, K. A. Aniol, E. A.J.M. Offermann, J. Domingo, K. A. Griffioen, C. Cavata, A. Soldi, A. J. Sarty, Gordon D. Cates, Laird Kramer, R. Madey, E. J. Brash, Kevin Fissum, Jing Zhao, R. Michaels, Justin I. McIntyre, and N. d'Hose

Subjects
Physics, Nuclear reaction, Proton, 010308 nuclear & particles physics, Hadron, General Physics and Astronomy, Elementary particle, 01 natural sciences, Omega, Baryon, 0103 physical sciences, Atomic physics, 010306 general physics, Nucleon, Relativistic quantum chemistry
Abstract

We have measured the cross section for quasielastic 1p -shell proton knockout in the {sup 16}O( e, e{sup '}p) reaction at {omega}=0.439 GeV and Q{sup 2}=0.8 (GeV/c){sup 2} for missing momentum P{sub miss}{

Published
2000

13. GEp/GMpRatio by Polarization Transfer ine→p→ep→

Author

M. K. Jones, K. A. Aniol, F. T. Baker, J. Berthot, P. Y. Bertin, W. Bertozzi, A. Besson, L. Bimbot, W. U. Boeglin, E. J. Brash, D. Brown, J. R. Calarco, L. S. Cardman, C.-C. Chang, J.-P. Chen, E. Chudakov, S. Churchwell, E. Cisbani, D. S. Dale, R. De Leo, A. Deur, B. Diederich, J. J. Domingo, M. B. Epstein, L. A. Ewell, K. G. Fissum, A. Fleck, H. Fonvieille, S. Frullani, J. Gao, F. Garibaldi, A. Gasparian, G. Gerstner, S. Gilad, R. Gilman, A. Glamazdin, C. Glashausser, J. Gomez, V. Gorbenko, A. Green, J.-O. Hansen, C. R. Howell, G. M. Huber, M. Iodice, C. W. de Jager, S. Jaminion, X. Jiang, W. Kahl, J. J. Kelly, M. Khayat, L. H. Kramer, G. Kumbartzki, M. Kuss, E. Lakuriki, G. Lavessière, J. J. LeRose, M. Liang, R. A. Lindgren, N. Liyanage, G. J. Lolos, R. Macri, R. Madey, S. Malov, D. J. Margaziotis, P. Markowitz, K. McCormick, J. I. McIntyre, R. L. J. van der Meer, R. Michaels, B. D. Milbrath, J. Y. Mougey, S. K. Nanda, E. A. J. M. Offermann, Z. Papandreou, C. F. Perdrisat, G. G. Petratos, N. M. Piskunov, R. I. Pomatsalyuk, D. L. Prout, V. Punjabi, G. Quéméner, R. D. Ransome, B. A. Raue, Y. Roblin, R. Roche, G. Rutledge, P. M. Rutt, A. Saha, T. Saito, A. J. Sarty, T. P. Smith, P. Sorokin, S. Strauch, R. Suleiman, K. Takahashi, J. A. Templon, L. Todor, P. E. Ulmer, G. M. Urciuoli, P. Vernin, B. Vlahovic, H. Voskanyan, K. Wijesooriya, B. B. Wojtsekhowski, R. J. Woo, F. Xiong, G. D. Zainea, and Z.-L. Zhou

Subjects
Elastic scattering, Physics, Proton, 010308 nuclear & particles physics, Proton magnetic moment, General Physics and Astronomy, Electron, Polarization (waves), 01 natural sciences, Charged particle, Nuclear physics, Magnetization, 0103 physical sciences, Magnetic form factor, Physics::Accelerator Physics, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

The ratio of the proton's elastic electromagnetic form factors was obtained by measuring the transverse and longitudinal polarizations of recoiling protons from the elastic scattering of polarized electrons with unpolarized protons. The ratio of the electric to magnetic form factor is proportional to the ratio of the transverse to longitudinal recoil polarizations. The ratio was measured over a range of four-momentum transfer squared between 0.5 and 3.5 GeV-squared. Simultaneous measurement of transverse and longitudinal polarizations in a polarimeter provides good control of the systematic uncertainty. The results for the ratio of the proton's electric to magnetic form factors show a systematic decrease with increasing four momentum squared, indicating for the first time a marked difference in the spatial distribution of charge and magnetization currents in the proton.

Published
2000

14. Measurement of the deuteron spin structure function g1d(x) for 1 (GeV/c)2<Q2<40 (GeV/c)2

Author

R. Erbacher, V. Ghazikhanian, G. G. Petratos, O. Rondon-Aramayo, B. A. Raue, H. Borel, Stephen M. Rock, K. A. Griffioen, H. R. Band, T. Averett, E. W. Hughes, Hongbo Zhu, L. S. Rochester, S. Bültmann, F. Sabatié, P.M. King, R. Gearhart, D. Crabb, L. Todor, J. Marroncle, P. McKee, Yu. G. Kolomensky, R. A. Lindgren, T. R. Wright, M. Olson, A. Feltham, Timothy B. Smith, D. Walz, R. G. Arnold, M. Zeier, L. M. Stuart, P. E. Bosted, B. Zihlmann, S. Trentalange, S.St. Lorant, L.M. Qin, John C. Mitchell, J. S. McCarthy, F.R. Wesselmann, G. A. Peterson, C. Harris, Ingo Sick, R. Prepost, C. Y. Prescott, D. Reyna, Gregory S. Mitchell, G. Igo, Donal Day, P.L. Anthony, H. Fonvieille, Emil Frlez, M.C. Berisso, R. M. Lombard-Nelsen, W. Meyer, J. Gomez, S. Churchwell, Ch. Hyde-Wright, Y. Terrien, J. R. Johnson, S. I. Penttilä, L. Sorrell, J. Jensen, R. Pitthan, F. Staley, M. A. Houlden, C. C. Young, P. Decowski, R. Erickson, Dinko Pocanic, Robert C. Welsh, S. E. Kuhn, P. DePietro, Z. M. Szalata, Sebastien Incerti, G.R. Court, A. Tobias, T. Toole, Timothy Chupp, and M.J. Buenerd

Subjects
Quark, Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Deuterium, Nuclear Theory, Electron, Spin structure, Nuclear Experiment, Polarization (waves), Deep inelastic scattering, High Energy Physics - Experiment
Abstract

New measurements are reported on the deuteron spin structure function g_1^d. These results were obtained from deep inelastic scattering of 48.3 GeV electrons on polarized deuterons in the kinematic range 0.01 < x < 0.9 and 1 < Q^2 < 40 (GeV/c)^2. These are the first high dose electron scattering data obtained using lithium deuteride (6Li2H) as the target material. Extrapolations of the data were performed to obtain moments of g_1^d, including Gamma_1^d, and the net quark polarization Delta Sigma., Comment: 5 pages, 2 figures

Published
1999

15. Measurements of R=σL/σT for 0.03<x<0.1 and fit to world data

Author

P. Raines, Ingo Sick, S.St. Lorant, D. Kawall, H. Borel, H. Tang, C. Y. Prescott, J. M. Bauer, H. R. Band, R. G. Arnold, F. S. Dietrich, L. M. Stuart, T. Maruyama, Ch. Hyde-Wright, D. Walz, J. L. White, J. S. McCarthy, P. E. Bosted, G. Court, T. Averett, Vincent Breton, P. Grenier, B. Raue, Kevin P. Coulter, S. Hoibraten, Pascal Steiner, R. Erbacher, F. Staley, D. Reyna, O. Rondon, P.L. Anthony, K. A. Griffioen, A. Feltham, E. W. Hughes, D. Crabb, J. Button-Shafer, R. Prepost, S. E. Rock, Timothy Chupp, A. Rijllart, J. Gomez, Timothy B. Smith, Y. Terrien, J. A. Dunne, L. C. Smith, K. Witte, T. L. Usher, W. Meyer, C. C. Young, J. Fellbaum, J. R. Johnson, D. Zimmermann, Avraham Klein, J. Morgenstern, M. Kuriki, Y. Roblin, Donal Day, Z. E. Meziani, F. Suekane, J. P. Chen, H. Dutz, R. C. Minehart, B. Zihlmann, Emil Frlez, B. Youngman, Koji Abe, R. Antonov, R. M. Lombard-Nelsen, H. Fonvieille, L. S. Rochester, R. A. Lindgren, G. G. Petratos, R. Gearhart, J. Marroncle, F.R. Wesselmann, John C. Mitchell, H. Yuta, G. H. Zapalac, R. Pitthan, J. Clendenin, T. J. Liu, Dinko Pocanic, S. E. Kuhn, Z. M. Szalata, T. Akagi, M. Spengos, X.K. Maruyama, D. Garvey, C. Comptour, and M. Daoudi

Subjects
Physics, Nuclear and High Energy Physics, Cross section.transverse, 010308 nuclear & particles physics, Scattering, chemistry.chemical_element, Electron, 01 natural sciences, Nuclear physics, Cross section (physics), chemistry, 0103 physical sciences, 010306 general physics, Carbon
Abstract

Measurements were made at SLAC of the cross section for scattering 29 GeV electrons from carbon at a laboratory angle of 4.5°, corresponding to 0.03

Published
1999

16. Measurements of the Deuteron Elastic Structure FunctionA(Q2)for0.7≤Q2≤6.0(GeV/c)2at Jefferson Laboratory

Author

Paul Souder, Z. L. Zhou, E. Burtin, R. I. Pomatsalyuk, D. S. Dale, N. d'Hose, Ch. Hyde-Wright, J. O. Hansen, T. Saito, H. Breuer, K. Arundell, Seigo Kato, W. M. Zhang, C. R. Howell, J. R. Calarco, S. Nanda, L. Auerbach, K. Wijesooriya, Kevin Fissum, G. M. Huber, G. Rutledge, R. W. Lourie, J. Domingo, Y. Roblin, H. Fonvieille, L. Bimbot, T. P. Smith, S. Frullani, E. Chudakov, P. E. Ulmer, L. A. Ewell, Nilanga Liyanage, Pierre Bertin, Mauro Iodice, S. Mehrabyan, G. W. Miller, S. Malov, P. Vernin, Bogdan Wojtsekhowski, Larry Weinstein, L. C. Alexa, R. Madey, W. Kahl, R. A. Lindgren, Richard Wilson, H. Voskanyan, Branislav Vlahovic, Charles Glashausser, C. Jutier, J. J. LeRose, M. Holtrop, A. Saha, D. Neyret, A. Gasparian, R. L.J. van der Meer, T. Terasawa, Vincent Breton, R. Suleiman, E. Cisbani, V. Gorbenko, G. M. Urciuoli, M. Liang, G. Quéméner, S. Platchkov, L. Cardman, D. J. Margaziotis, David L. Prout, C. Cavata, K. Soldi, A. Serdarevic, K. Kino, Z. Papandreou, A. Leone, S. Jaminion, F. T. Baker, P. M. Rutt, A. J. Sarty, J. Gomez, D. Rowntree, William Bertozzi, Jing Zhao, Ronald Ransome, James J. Kelly, J. Jardillier, J. M. Finn, T. Pussieux, Pete Markowitz, R. Michaels, J. Gao, D. M. Manley, H. Ueno, Jian-Ping Chen, A. Ketikyan, G. Lavessiere, D. G. Zainea, V. A. Punjabi, E. J. Brash, J. W. Watson, A. T. Katramatou, Roberto Perrino, C. C. Chang, R. De Leo, S. Kerhoas, K. S. Kumar, A. V. Glamazdin, B. Diederich, Shalev Gilad, M. Khayat, L. Van Hoorebeke, O. Ravel, Justin I. McIntyre, Pavel Sorokin, L. Todor, J. A. Templon, R. Holmes, C. W. de Jager, W. U. Boeglin, K. A. Aniol, G. G. Petratos, Z. E. Meziani, B. D. Anderson, G. J. Lolos, M. B. Epstein, J. Berthot, A. Deur, J. Martino, C. F. Perdrisat, E. A.J.M. Offermann, Kazushige Maeda, Haiyan Gao, J. Marroncle, Laird Kramer, J. Y. Mougey, C. J. Martoff, F. Garibaldi, G. Kumbartzki, Ronald Gilman, Hiroaki Tsubota, K. McCormick, B. Frois, N Degrande, M. K. Jones, and M. Kuss

Subjects
Quantum chromodynamics, Quark, Physics, Particle physics, 010308 nuclear & particles physics, Scattering, High Energy Physics::Lattice, Nuclear Theory, Quark model, General Physics and Astronomy, Elementary particle, 7. Clean energy, 01 natural sciences, Gluon, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Quantum field theory, Nuclear Experiment, 010306 general physics, Boson
Abstract

The deuteron elastic structure function A(Q2) has been extracted in the range 0.7≤Q2≤6.0(GeV/c)2 from cross section measurements of elastic electron-deuteron scattering in coincidence using the Hall A Facility of Jefferson Laboratory. The data are compared to theoretical models, based on the impulse approximation with the inclusion of meson-exchange currents, and to predictions of quark dimensional scaling and perturbative quantum chromodynamics.

Published
1999

17. Measurement of the neutral weak form factors of the proton

Author

Justin I. McIntyre, B. Frois, D. Neyret, J. Jardillier, G. D. Cates, A. V. Glamazdin, M. B. Epstein, J. M. Finn, B. Humensky, R. Holmes, D. Lhuillier, J. Gao, F. Garibaldi, D. S. Armstrong, Min Suk Kim, P. Mastromarino, K. Wijesooriya, C. F. Perdrisat, Sebastien Incerti, C. Cavata, J. Thompson, R. Michaels, A. Gasparian, R. I. Pomatsalyuk, Arijit Saha, W. Kahl, J. R. Calarco, F. Marie, G. A. Rutledge, T. Pussieux, Andre Fleck, V. Gorbenko, M. B. Leuschner, G. M. Gerstner, Kevin Fissum, L. Todor, G. Quéméner, J.P. Jorda, P. M. Rutt, E. Chudakov, Paul Souder, J. LeRose, V. A. Punjabi, Bogdan Wojtsekhowski, Daijin Kim, J. S. Price, N. Falletto, R. Suleiman, K. Kramer, Z. E. Meziani, E. Burtin, M. Holtrop, J. P. Chen, R. W. Lourie, D. S. Dale, Stephanie Escoffier, J. Martino, Richard Madey, F. W. Hersman, C. W. de Jager, K. A. Aniol, K. S. Kumar, L. A. Ewell, P. E. Ulmer, A. Deur, G. W. Miller, C. Jutier, David L. Prout, P. Djawotho, Nilanga Liyanage, Marcus Spradlin, G. G. Petratos, Richard Wilson, Branislav Vlahovic, M. K. Jones, D. J. Margaziotis, J. Gomez, M. Kuss, Ronald Gilman, K. McCormick, M. Baylac, and Olfred Hansen

Subjects
Quantum chromodynamics, Elastic scattering, Physics, Strange quark, Particle physics, Proton, Degree (graph theory), Electric form factor, FOS: Physical sciences, General Physics and Astronomy, Standard Model, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Sensitivity (control systems), Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from the proton. The kinematic point (theta_lab = 12.3 degrees and Q^2=0.48 (GeV/c)^2) is chosen to provide sensitivity, at a level that is of theoretical interest, to the strange electric form factor G_E^s. The result, A=-14.5 +- 2.2 ppm, is consistent with the electroweak Standard Model and no additional contributions from strange quarks. In particular, the measurement implies G_E^s + 0.39G_M^s = 0.023 +- 0.034 (stat) +- 0.022 (syst) +- 0.026 (delta G_E^n), where the last uncertainty arises from the estimated uncertainty in the neutron electric form factor., 10 pages, 4 figures, submitted to Phys. Rev. Lett

Published
1999

18. Measurement of the Proton and Deuteron Spin Structure Functiong1in the Resonance Region

Author

D. Crabb, A. Rijllart, J. P. Chen, F.R. Wesselmann, G. Court, John C. Mitchell, L. S. Rochester, R. Pitthan, Timothy B. Smith, H. Tang, D. Reyna, Ingo Sick, H. Borel, B. Zihlmann, Emil Frlez, M. Kuriki, L. C. Smith, J. Fellbaum, R. Antonov, Vincent Breton, O. Rondon, K. Witte, K. P. Coulter, R. M. Lombard-Nelsen, K. A. Griffioen, J. Clendenin, E. W. Hughes, J. R. Johnson, P.L. Anthony, C. Y. Prescott, A. Feltham, R. G. Arnold, P. Raines, T. J. Liu, Dinko Pocanic, F. S. Dietrich, R. Gearhart, S. E. Rock, S. E. Kuhn, J. Gomez, F. Suekane, James L. White, P. Grenier, R. Prepost, S.St. Lorant, G. H. Zapalac, W. Meyer, J. Button-Shafer, J. Marroncle, J. A. Dunne, R. C. Minehart, Koji Abe, Z. M. Szalata, C. C. Young, D. Walz, Avraham Klein, Ch. Hyde-Wright, H. Yuta, D. Kawall, P. E. Bosted, D. Garvey, H. Fonvieille, B. Raue, H. Dutz, R. A. Lindgren, Timothy Chupp, S. Hoibraten, Pascal Steiner, F. Staley, B. Youngman, G. G. Petratos, T. Averett, R. Erbacher, Z. E. Meziani, J. Morgenstern, X.K. Maruyama, Donal Day, C. Comptour, M. Daoudi, J. M. Bauer, H. R. Band, Y. Roblin, L. M. Stuart, T. Maruyama, T. L. Usher, D. Zimmermann, Y. Terrien, J. S. McCarthy, T. Akagi, and M. Spengos

Subjects
Physics, Nuclear physics, Proton, Scattering, General Physics and Astronomy, Resonance, Electron, Atomic physics, Inelastic scattering, Spin structure, Nucleon, Spin-½
Abstract

We have measured the proton and deuteron spin structure functions g[sup p][sub 1] and g[sup d][sub 1] in the region of the nucleon resonances for W2 < 5GeV2 and Q2(similar, equals)0.5 and Q2(similar, equals)1.2GeV2 by inelastically scattering 9.7 GeV polarized electrons off polarized 15NH3 and 15ND3 targets. We observe significant structure in g[sup p][sub 1] in the resonance region. We have used the present results, together with the deep-inelastic data at higher W2, to extract Gamma (Q2)(equivalent)01 g1(x,Q2)dx. This is the first information on the low-Q2 evolution of Gamma toward the Gerasimov-Drell-Hearn limit at Q2 = 0.

Published
1997

19. Hard Two-body Photodisintegration of 3He

Author

G. Niculescu, N. Dashyan, D. Protopopescu, E. Cisbani, S. Pozdniakov, G. Rosner, S. Tkachenko, C. Djalali, Yujie Qiang, C. S. Nepali, X. Yan, Idaykis Rodriguez, F. X. Girod, Yordanka Ilieva, L. Guo, Andrew Puckett, G. Charles, Yingxiao Wang, H. Baghdasaryan, Victor Mokeev, S. Beck, Martin K. Mayer, M. S. Saini, Nikolaos Sparveris, X. Zhan, E. Voutier, J. A. Fleming, Ronald Gilman, E. L. Isupov, J. T. Goetz, E. De Sanctis, Dustin Keller, E. Piasetzky, Diane Schott, R. Shneor, G. Ricco, C. W. de Jager, W. Tang, Franco Garibaldi, M. Aghasyan, A. I. Ostrovidov, K. Park, G. G. Petratos, Bryan J. Moffit, Michael Wood, K. Hafidi, T. Mineeva, N. Harrison, A. Deur, Barry Ritchie, P. L. Cole, M. Osipenko, M. Contalbrigo, N. A. Saylor, J. Bono, P. Nadel-Turonski, S. Boiarinov, D. G. Ireland, M. Anghinolfi, H. Seraydaryan, X. Zheng, D. Doughty, I. Zonta, B. S. Ishkhanov, H. Yao, W. K. Brooks, C. E. Taylor, R. A. Schumacher, R. Dupre, N. Bubis, X. Jiang, A. El Alaoui, D. Martinez, M. Battaglieri, V. Crede, B. Lee, K. Joo, Volker D. Burkert, A. S. Biselli, George Davey Smith, D. Heddle, S. Koirala, Guy Ron, V. P. Kubarovsky, K. A. Griffioen, R. De Vita, A. Kim, E. Golovatch, A. Beck, N. A. Baltzell, O. Pogorelko, M. Ungaro, N. D. Kvaltine, Xin Qian, W. J. Briscoe, J. P. Ball, R. A. Montgomery, S. Chandavar, Y. Mao, Friedrich Klein, K. Chirapatpimol, P. Khetarpal, D. S. Carman, P. Stoler, O. Geagla, Nicholas Zachariou, A. Camsonne, S. Anefalos Pereira, Michael Vineyard, A. J. Sarty, N. K. Walford, P. Eugenio, D. G. Meekins, A. D'Angelo, H. Voskanyan, A. T. Katramatou, R. Michaels, Douglas Higinbotham, M. Taiuti, K. Hicks, C. Dutta, Vincent Sulkosky, S. Stepanyan, E. Schulte, E. Munevar, Bogdan Wojtsekhowski, D. Rimal, E. Seder, A. Fradi, B. Vernarsky, S. Lewis, M. J. Amaryan, B. Guegan, C. E. Hyde, F. Sabatié, L. El Fassi, W. U. Boeglin, G. E. Dodge, S. Procureur, R. Nasseripour, C. Munoz Camacho, H. Y. Lu, S. Fegan, R. A. Lindgren, S. Strauch, H. S. Jo, Ishay Pomerantz, J. J. LeRose, C. A. Meyer, S. Pisano, G. V. Fedotov, H. Moutarde, D. P. Watts, H. Egiyan, C. Bookwalter, F. Cusanno, K. Livingston, K. L. Giovanetti, I. Niculescu, I. J. D. MacGregor, K. P. Adhikari, D. P. Weygand, Larry Weinstein, W. Gohn, R. Paremuzyan, Jie Zhang, A. Celentano, R. W. Gothe, Z. W. Zhao, D. Ho, Emily M. McCullough, R. Subedi, D. Sokhan, M. Khandaker, B. McKinnon, B. L. Berman, J. Glister, M. Mirazita, E. Phelps, N. Gevorgyan, V. Batourine, S. Park, S. Niccolai, P. Rossi, H. Hakobyan, M. Guidal, M. Holtrop, A. Daniel, Luciano Pappalardo, S. S. Stepanyan, Mustafa Canan, Kalyan Allada, I. Bedlinskiy, A. Kubarovsky, Sergey Kuleshov, E. Khrosinkova, B. Sawatzky, M. Ripani, A. Saha, W. Kim, Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), CLAS, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)

Subjects
Particle physics, Photon, Nuclear Theory, FOS: Physical sciences, General Physics and Astronomy, Few-body systems, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Settore FIS/04 - Fisica Nucleare e Subnucleare, Nuclear physics, Cross section (physics), ANGLE ELASTIC-SCATTERING, CROSS-SECTION, DEUTERON, 0103 physical sciences, medicine, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Scaling, Physics, 010308 nuclear & particles physics, medicine.anatomical_structure, Deuterium, Photodisintegration, Nucleus
Abstract

We have measured cross sections for the {gamma}+{sup 3}He->p+d reaction at photon energies of 0.4 - 1.4 GeV and a center-of-mass angle of 90 deg. We observe dimensional scaling above 0.7 GeV at this center-of-mass angle. This is the first observation of dimensional scaling in the photodisintegration of a nucleus heavier than the deuteron.

Published
2013

20. Deep inelastic scattering of polarized electrons by polarizedHe3and the study of the neutron spin structure

Author

W. Meyer, Sayed Rokni, Timothy Chupp, Y. Roblin, J. Morgenstern, C. C. Young, R. Prepost, H. Borel, E. W. Hughes, Z. M. Szalata, S. E. Rock, Timothy B. Smith, R. G. Arnold, H. Fonvieille, M. Woods, H. R. Band, F. S. Dietrich, P. E. Bosted, J. Fellbaum, F. Staley, H. Middleton, M. Spengos, Y. Terrien, Alan K. Thompson, L. M. Stuart, R. Erbacher, J. A. Dunne, T. Maruyama, J. Xu, Z. E. Meziani, Gilbert Shapiro, J. R. Johnson, N. R. Newbury, D. Kawall, G. G. Petratos, R. Holmes, G. H. Zapalac, J. Marroncle, P.L. Anthony, C. E. Keppel, James L. White, Vincent Breton, S. E. Kuhn, Gordon D. Cates, R. Pitthan, Paul A Souder, R. M. Lombard-Nelsen, and R. A. Gearhart

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Proton, High density, Neutron, Electron, Spin structure, Nucleon, Deep inelastic scattering
Abstract

The neutron longitudinal and transverse asymmetries ${A}_{1}^{n}$ and ${A}_{2}^{n}$ have been extracted from deep inelastic scattering of polarized electrons by a polarized $^{3}\mathrm{He}$ target at incident energies of 19.42, 22.66, and 25.51 GeV. The measurement allows for the determination of the neutron spin structure functions ${g}_{1}^{n}(x, {Q}^{2})$ and ${g}_{2}^{n}(x, {Q}^{2})$ over the range $0.03lxl0.6$ at an average ${Q}^{2}$ of 2 ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$. The data are used for the evaluation of the Ellis-Jaffe and Bjorken sum rules. The neutron spin structure function ${g}_{1}^{n}(x, {Q}^{2})$ is small and negative within the range of our measurement, yielding an integral $\ensuremath{\int}{0.03}^{0.6}{g}_{1}^{n}(x)\mathrm{dx}=\ensuremath{-}0.028\ifmmode\pm\else\textpm\fi{}0.006 (\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.006 (\mathrm{syst})$. Assuming Regge behavior at low $x$, we extract ${\ensuremath{\Gamma}}_{1}^{n}=\ensuremath{\int}{0}^{1}{g}_{1}^{n}(x)\mathrm{dx}=\ensuremath{-}0.031\ifmmode\pm\else\textpm\fi{}0.006 (\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.009 (\mathrm{syst})$. Combined with previous proton integral results from SLAC experiment E143, we find ${\ensuremath{\Gamma}}_{1}^{p}\ensuremath{-}{\ensuremath{\Gamma}}_{1}^{n}=0.160\ifmmode\pm\else\textpm\fi{}0.015$ in agreement with the Bjorken sum rule prediction ${\ensuremath{\Gamma}}_{1}^{p}\ensuremath{-}{\ensuremath{\Gamma}}_{1}^{n}=0.176\ifmmode\pm\else\textpm\fi{}0.008$ at a ${Q}^{2}$ value of 3 ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$ evaluated using ${\ensuremath{\alpha}}_{s}=0.32\ifmmode\pm\else\textpm\fi{}0.05$.

Published
1996

21. Inclusive electron scattering from nuclei atx≃1

Author

J. Arrington, H. J. Bulten, Haiyan Gao, H. E. Jackson, P. L. Anthony, D. H. Potterveld, B. Mueller, L. H. Tao, Kisoo Lee, B. Zeidman, P. E. Bosted, R. Gearhart, S. E. Kuhn, C. E. Jones, J. O. Hansen, K. P. Coulter, Ross Milner, J. L. White, E. R. Kinney, J. E. Belz, M. Spengos, B. W. Filippone, D. F. Geesaman, G. G. Petratos, R. G. Arnold, Z. M. Szalata, Michael Chapman, S. E. Rock, F. S. Dietrich, R. Ent, van den J.F.J. Brand, R. D. McKeown, D. Winter, E. J. Beise, D. J. Margaziotis, C. E. Keppel, R. J. Holt, Naomi C R Makins, Thomas O'Neill, A. Lung, M. Epstein, V. Papavassiliou, Jenny Nelson, Wolfgang Lorenzon, van K. Bibber, and J. Napolitano

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Scattering, Momentum transfer, Duality (optimization), Scattering length, Electron, 01 natural sciences, Nuclear physics, 0103 physical sciences, Atomic physics, 010306 general physics, Nucleon, Electron scattering, Scaling
Abstract

The inclusive A(e,e′) cross section for x≃1 was measured on ^2H, C, Fe, and Au for momentum transfers Q^2 from 1 to 6.8 (GeV/c)^2. The scaling behavior of the data was examined in the region of transition from y scaling to x scaling. Throughout this transitional region, the data exhibit ξ scaling, reminiscent of the Bloom-Gilman duality seen in free nucleon scattering.

Published
1996

22. Measurements of the Proton and Deuteron Spin Structure Functiong2and AsymmetryA2

Author

Y. Terrien, L.S. Rochester, T. L. Usher, J. Morgenstern, Donal Day, J. M. Bauer, R. A. Lindgren, D. Zimmermann, R. Prepost, K. A. Griffioen, H. R. Band, R. A. Gearhart, H. Borel, John C. Mitchell, C. Y. Prescott, T. Akagi, Y. Roblin, J. Gomez, H. Fonvieille, P. Grenier, E. W. Hughes, J. Button-Shafer, G. H. Zapalac, R. G. Arnold, J. Marroncle, D. Kawall, Jian-Ping Chen, T. Averett, W. Meyer, D. Walz, P. Raines, F. S. Dietrich, H. Yuta, C. E. Hyde-Wright, Timothy B. Smith, R. Pitthan, L. M. Stuart, K. Witte, P. E. Bosted, T. Maruyama, P.L. Anthony, Avraham Klein, Kevin P. Coulter, James L. White, J. Fellbaum, S.St. Lorant, D. Reyna, D. Garvey, B. Zihlmann, Emil Frlez, F. Staley, C. C. Young, T. J. Liu, M. Spengos, A. Rijllart, B. Raue, Z. M. Szalata, S. Hoibraten, R. Antonov, M. Kuriki, H. Dutz, J. A. Dunne, R. M. Lombard-Nelsen, Dinko Pocanic, K. Abe, Pascal Steiner, B. Youngman, X.K. Maruyama, L. C. Smith, O. Rondon, J. Clendenin, R. Erbacher, Z. E. Meziani, S. E. Kuhn, S. E. Rock, C. Comptour, G. G. Petratos, M. Daoudi, Ingo Sick, Timothy Chupp, J.R. Johnson, Vincent Breton, R. C. Minehart, A. Feltham, G.R. Court, D. G. Crabb, H. Tang, J. S. McCarthy, and F. Suekane

Subjects
Physics, Matrix (mathematics), Deuterium, Proton, Scattering, media_common.quotation_subject, General Physics and Astronomy, Electron, Atomic physics, Spin structure, Asymmetry, media_common, Spin-½
Abstract

We have measured proton and deuteron virtual photon-nucleon asymmetries A{sup p}{sub 2} and A{sup d}{sub 2} and structure functions g{sup p}{sub 2} and g{sup d}{sub 2} over the range 0.03 < x < 0.8 and 1.3 < Q{sup 2} < 10 (GeV/c){sup 2} by inelastically scattering polarized electrons off polarized ammonia targets. Results for A{sub 2} are significantly smaller than the positivity limit (sqrt)R for both targets. Within experimental precision the g{sub 2} data are well described by the twist-2 contribution, g{sup ww}{sub 2}. Twist-3 matrix elements have been extracted and are compared to theoretical predictions.

Published
1996

23. Measurements of the Q2-dependence of the proton and deuteron spin structure functions g1 and g1

Author

A. Rijllart, J. Marroncle, Z. M. Szalata, J. Clendenin, T. Akagi, P. Raines, H. Dutz, T. J. Liu, Dinko Pocanic, H. R. Band, M. Kuriki, J. P. Chen, John C. Mitchell, S. E. Kuhn, B. Youngman, R. Prepost, S.St. Lorant, D. Walz, G. Court, Ingo Sick, Timothy B. Smith, J. Gomez, X.K. Maruyama, D. Kawall, K. Witte, L. M. Stuart, T. Maruyama, P. E. Bosted, P.L. Anthony, J. Fellbaum, C. Comptour, M. Daoudi, C. E. Hyde-Wright, R. Pitthan, D. Garvey, C. Y. Prescott, W. Meyer, Avraham Klein, R. A. Lindgren, G. G. Petratos, M. Spengos, F. Staley, L.S. Rochester, C. C. Young, T. L. Usher, B. Raue, S. Hoibraten, R. C. Minehart, D. Zimmermann, Pascal Steiner, H. Yuta, P. Grenier, K. A. Griffioen, Timothy Chupp, L. C. Smith, F. Suekane, J. Morgenstern, J. R. Johnson, G. H. Zapalac, Donal Day, Y. Roblin, D. G. Crabb, H. Tang, J. Button-Shafer, Koji Abe, J. A. Dunne, H. Fonvieille, H. Borel, J. S. McCarthy, F. S. Dietrich, T. Averett, R. G. Arnold, R. Erbacher, Z. E. Meziani, D. Reyna, R. A. Gearhart, A. Feltham, E. W. Hughes, J. L. White, J. M. Bauer, Vincent Breton, Kevin P. Coulter, O. Rondon, S. E. Rock, Y. Terrien, B. Zihlmann, Emil Frlez, R. Antonov, and R. M. Lombard-Nelsen

Subjects
Nuclear physics, Physics, High Energy Physics - Experiment (hep-ex), Nuclear and High Energy Physics, Deuterium, Proton, FOS: Physical sciences, Spin structure, High Energy Physics - Experiment
Abstract

The ratio g1/F1 has been measured over the range 0.031 (GeV/c)2. A trend is observed for g1/F1 to decrease at lower Q2. Fits to world data with and without a possible Q2-dependence in g1/F1 are in agreement with the Bjorken sum rule, but Delta_q is substantially less than the quark-parton model expectation., Comment: 16 pages, format is postscript file, gzip-ed, uuencode-ed

Published
1995

24. Evidence For Virtual Compton-Scattering From The Proton

Author

B. W. Filippone, Jenny Nelson, Kisoo Lee, Haiyan Gao, D. H. Potterveld, D. F. Geesaman, E. R. Kinney, H. E. Jackson, B. Zeidman, S. E. Rock, R. D. McKeown, K. van Bibber, B. Mueller, Michael Chapman, M. B. Epstein, K. P. Coulter, R. A. Gearhart, Jim Napolitano, Wolfgang Lorenzon, D. J. Margaziotis, J. Arrington, E. J. Beise, H. J. Bulten, P.L. Anthony, J.-O. Hansen, F. S. Dietrich, S. E. Kuhn, J. F. J. van den Brand, P. E. Bosted, G. G. Petratos, J. E. Belz, Thomas O'Neill, L. H. Tao, M. Spengos, Rolf Ent, V. Papavassiliou, Z. M. Szalata, A. Lung, D. A. Wasson, R. G. Arnold, C. E. Jones, C. E. Keppel, Ross Milner, James L. White, R. J. Holt, and Naomi C R Makins

Subjects
Physics, Photon, Proton, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Compton scattering, Electron, Compton wavelength, MAGNETIC FORM-FACTORS, Inelastic scattering, Q(2)=1.75, Linear particle accelerator, Nuclear physics, (GEV/C)(2), Physics::Accelerator Physics, Nucleon, Nuclear Experiment
Abstract

In virtual Compton scattering an electron is scattered off a nucleon such that the nucleon emits a photon. We show that these events can be selected experimentally, and present the first evidence for virtual Compton scattering from the proton in data obtained at the Stanford Linear Accelerator Center. The angular and energy dependence of the data is well described by a calculation that includes the coherent sum of electron and proton radiation.

Published
1995

25. Precision Measurement of the Deuteron Spin Structure Functiong1d

Author

H. Dutz, B. Youngman, John C. Mitchell, J. M. Bauer, G. H. Zapalac, P.L. Anthony, J. Marroncle, F. Suekane, D. Crabb, A. Rijllart, Ingo Sick, P. Raines, Koji Abe, P. Grenier, L. S. Rochester, R. Pitthan, Y. Roblin, C. Y. Prescott, O. Rondon, K. P. Coulter, Ch. Hyde-Wright, W. Meyer, F. S. Dietrich, Jian-Ping Chen, R. C. Minehart, S. E. Rock, J. Gomez, H. Fonvieille, M. Kuriki, X.K. Maruyama, J. Button-Shafer, F. Staley, H. Borel, T. Averett, R. Prepost, Z. M. Szalata, Timothy B. Smith, S.St. Lorant, R. Erbacher, Z. E. Meziani, D. Walz, D. Kawall, Timothy Chupp, P. E. Bosted, R. G. Arnold, C. Comptour, T. L. Usher, H. Yuta, K. Witte, G. Court, Y. Terrien, M. Daoudi, D. Garvey, D. Zimmermann, H. Tang, M. Spengos, B. Raue, J. Fellbaum, R. A. Lindgren, G. G. Petratos, J. Morgenstern, S. Hoibraten, Pascal Steiner, T. J. Liu, Dinko Pocanic, Donal Day, L. C. Smith, S. E. Kuhn, J. Clendenin, T. Akagi, J. A. Dunne, J. R. Johnson, J. S. McCarthy, Avraham Klein, D. Reyna, B. Zihlmann, Emil Frlez, J. L. White, R. Antonov, R. M. Lombard-Nelsen, Vincent Breton, K. A. Griffioen, A. Feltham, E. W. Hughes, R. Gearhart, C. C. Young, L. M. Stuart, T. Maruyama, and H. R. Band

Subjects
Physics, Nuclear physics, General Physics and Astronomy, Library science, Christian ministry
Abstract

This work was supported by Department of Energy Contracts No. DE-AC05-84ER40150 (CEBAF), No. W-2795-Eng-48 (LLNL), No. DE-AC0376SF00515 (SLAC), No. DE-FG03-88ER40439 (Stanford), No. DE-FG05-88ER40390 and No. DEFG05-86ER4026 (Virginia), and No. DE-AC02-76ER00881 (Wisconsin); by National Science Foundation Grants No. 9114958 (American), No. 9307710 (Massachusetts), No. 9217979 (Michigan), No. 9104975 (ODU) and No. 9118137 (U. Penn.); by the Schweizersche Nationalfonds (Basel); by the Commonwealth of Virginia (Virginia); by the Centre NAtional de la Recherche Scientifique and the Commissariat a l'Energie Atomique (French groups); and by the Japanese Ministry of Education, Science and Culture (Tohoku).

Published
1995

26. Precision Measurement of the Proton Spin Structure Functiong1p

Author

T. Akagi, O. Rondon, H. Yuta, K. P. Coulter, K. Witte, J. Marroncle, S. E. Rock, R. Gearhart, D. Crabb, A. Rijllart, J. Gomez, C. C. Young, J. Clendenin, L. C. Smith, Y. Roblin, X.K. Maruyama, G. H. Zapalac, L. M. Stuart, K. A. Griffioen, John C. Mitchell, P. Grenier, R. C. Minehart, T. Maruyama, H. Borel, J. R. Johnson, Timothy B. Smith, Koji Abe, C. Comptour, M. Daoudi, T. L. Usher, C. Y. Prescott, Y. Terrien, F. S. Dietrich, J. A. Dunne, H. R. Band, P. Raines, A. Feltham, E. W. Hughes, Ch. Hyde-Wright, G.R. Court, M. Kuriki, H. Dutz, Avraham Klein, H. Fonvieille, Donal Day, J. Fellbaum, D. Zimmermann, J. P. Chen, T. J. Liu, Dinko Pocanic, J. L. White, J. Button-Shafer, T. Averett, S. E. Kuhn, Vincent Breton, R. Erbacher, Z. E. Meziani, J. M. Bauer, L. S. Rochester, S.St. Lorant, R. Pitthan, R. A. Lindgren, G. G. Petratos, D. Reyna, D. Kawall, F. Staley, Z. M. Szalata, R. Prepost, D. Walz, P. E. Bosted, Ingo Sick, D. Garvey, F. Suekane, J. S. McCarthy, R. G. Arnold, M. Spengos, P.L. Anthony, B. Raue, S. Hoibraten, Pascal Steiner, W. Meyer, Timothy Chupp, B. Youngman, J. Morgenstern, B. Zihlmann, Emil Frlez, R. Antonov, R. M. Lombard-Nelsen, and H. Tang

Subjects
Combinatorics, Physics, Nuclear magnetic resonance, Particle properties, Hydrogen compounds, Proton spin crisis, Structure function, General Physics and Astronomy
Abstract

We have measured the ratio [ital g][sup [ital p]][sub 1]/[ital F][sup [ital p]][sub 1] over the range 0.029[lt][ital x][lt]0.8 and 1.3[lt][ital Q][sup 2][lt]10 (GeV/[ital c])[sup 2] using deep-inelastic scattering of polarized electrons from polarized ammonia. An evaluation of the integral [integral][ital g][sup [ital p]][sub 1]([ital x],[ital Q][sup 2])[ital dx] at fixed [ital Q][sup 2]=3 (GeV/[ital c])[sup 2] yields 0.127[plus minus]0.004(stat)[plus minus]0.010(syst), in agreement with previous experiments, but well below the Ellis-Jaffe sum rule prediction of 0.160[plus minus]0.006. In the quark-parton model, this implies [Delta][ital q]=0.27[plus minus]0.10.

Published
1995

27. Virtual Compton scattering and the generalized polarizabilities of the proton atQ2=0.92and 1.76 GeV2

Author

L. B. Auerbach, C. Cavata, D. J. Margaziotis, K. Kino, A. J. Sarty, Seigo Kato, J. A. Templon, B. Frois, Ronald Ransome, D. Rowntree, R. W. Lourie, Christophe Furget, P. Grenier, M. K. Jones, D. S. Dale, G. W. Miller, H. Voskanyan, C. Jutier, S. Frullani, Z. L. Zhou, C. R. Howell, W. Kahl, M. Khayat, A. T. Katramatou, M. Kuss, J. W. Watson, K. Wijesooriya, W. M. Zhang, J. Jardillier, G.I. Smirnov, David L. Prout, G. Laveissière, A. Deur, G. E. Dodge, J. R. Calarco, G. Fournier, N. Degrande, R. A. Lindgren, J. J. LeRose, R. I. Pomatsalyuk, E. J. Brash, W. U. Boeglin, V. Gorbenko, R. Suleiman, F. T. Baker, S. Platchkov, G. M. Huber, F. Garibaldi, Ronald Gilman, K. McCormick, G. Rutledge, T. Saito, Richard Madey, G. G. Petratos, Z. E. Meziani, K. Arundell, Marc Vanderhaeghen, J. Martino, James J. Kelly, S. Kox, J. Marroncle, L. Cardman, C. E. Hyde, Raphael Noel Tieulent, Z. Papandreou, Pierre A.M. Guichon, F. Merchez, Bogdan Wojtsekhowski, D. Marchand, E. Tomasi-Gustaffson, M. Liang, P. M. Rutt, F. Renard, Shalev Gilad, S. Mehrabyan, G. Quéméner, V. A. Punjabi, D. M. Manley, C. W. de Jager, R. L.J. van der Meer, K. A. Aniol, Nilanga Liyanage, A. Gasparian, B. D. Anderson, G. J. Lolos, M. B. Epstein, Richard Wilson, Branislav Vlahovic, L. C. Alexa, A. Ketikyan, P. E. Ulmer, A. V. Glamazdin, E. A.J.M. Offermann, Jing Zhao, P. Y. Bertin, L. Van Hoorebeke, T. Pussieux, Mauro Iodice, Larry Weinstein, Laird Kramer, T. Terasawa, Vincent Breton, J. Gao, C. F. Perdrisat, C. Marchand, D. Neyret, William Bertozzi, R. Michaels, R. Holmes, H. Fonvieille, D. G. Zainea, Charles Glashausser, C. C. Chang, K. S. Kumar, J. Domingo, Pavel Sorokin, Haiyan Gao, Pete Markowitz, L. Bimbot, R. Di Salvo, J. M. Finn, J. S. Real, Justin I. McIntyre, S. Jaminion, G. Kumbartzki, E. Chudakov, Barbara Pasquini, Latifa Elouadrhiri, N. d'Hose, Roberto Perrino, R. De Leo, M. Baylac, J. O. Hansen, J. P. Chen, R. Van de Vyver, G. M. Urciuoli, J. Berthot, H. Breuer, Kevin Fissum, L. A. Ewell, G. Audit, Kazushige Maeda, J. Mougey, O. Ravel, S. Malov, E. Burtin, M. Holtrop, J. Gomez, Thomas E. Smith, Paul Souder, H. Ueno, S. K. Nanda, Hiroaki Tsubota, S. Kerhoas, L. Todor, A. Leone, A. Saha, E. Voutier, K. Soldi, A. Serdarevic, Sebastien Incerti, Y. Roblin, P. Vernin, and E. Cisbani

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, Chiral perturbation theory, Proton, 010308 nuclear & particles physics, Structure function, Compton scattering, 01 natural sciences, Nuclear physics, Amplitude, Dispersion relation, 0103 physical sciences, Beta (velocity), 010306 general physics
Abstract

Virtual Compton Scattering (VCS) on the proton has been studied at Jefferson Lab using the exclusive photon electroproduction reaction (e p --> e p gamma). This paper gives a detailed account of the analysis which has led to the determination of the structure functions P{sub LL}-P{sub TT}/epsilon and P{sub LT}, and the electric and magnetic generalized polarizabilities (GPs) alpha{sub E}(Q{sup 2}) and beta{sub M}(Q{sup 2}) at values of the four-momentum transfer squared Q{sup 2} = 0.92 and 1.76 GeV{sup 2}. These data, together with the results of VCS experiments at lower momenta, help building a coherent picture of the electric and magnetic GPs of the proton over the full measured Q{sup 2}-range, and point to their non-trivial behavior.

Published
2012

28. Determination of the neutron spin structure function

Author

H. Fonvieille, E. W. Hughes, Y. Terrien, Sayed Rokni, Thomas E. Smith, P. E. Bosted, J. Xu, H. Borel, F. S. Dietrich, R. A. Gearhart, J. Fellbaum, P.L. Anthony, S. E. Rock, H. Middleton, M. Spengos, F. Staley, Nathan R. Newbury, R. G. Arnold, Vincent Breton, H. R. Band, Gordon D. Cates, R. Prepost, S. E. Kuhn, R. Erbacher, Gilbert Shapiro, J. A. Dunne, James L. White, M. Woods, Z. E. Meziani, G. G. Petratos, W. Meyer, Timothy Chupp, R. Holmes, G. H. Zapalac, J. Marroncle, J.R. Johnson, Z. M. Szalata, Paul Souder, C. E. Keppel, C. C. Young, R. Pitthan, R. M. Lombard-Nelsen, L. M. Stuart, D. Kawall, J. Morgenstern, T. Maruyama, Alan K. Thompson, Y. Roblin, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), E142, and Hughes V.W. Cavata C.

Subjects
Physics, Nuclear reaction, Particle physics, Proton, 010308 nuclear & particles physics, Hadron, General Physics and Astronomy, Elementary particle, Inelastic scattering, 01 natural sciences, 7. Clean energy, 0103 physical sciences, Proton spin crisis, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Sum rule in quantum mechanics, 010306 general physics, Nucleon
Abstract

The authors report the results of the experiment E142 which measured the spin dependent structure function of the neutron, g{sub 1}{sup n}(x, Q{sup 2}). The experiment was carried out at the Stanford Linear Accelerator Center by measuring an asymmetry in the deep inelastic scattering of polarized electrons from a polarized {sup 3}He target, at electron energies from 19 to 26 GeV. The structure function was determined over the kinematic range 0.03 < BJorken x < 0.6 and 1.0 < Q{sup 2} < 5.5 (GeV/c){sup 2}. An evaluation of the integral {integral}{sub 0}{sup 1} g{sub 1}{sup n}(x,Q{sup 2})dx at fixed Q{sup 2} = 2 (GeV/c){sup 2} yields the final result {Lambda}{sub 1}{sup n} = -0.032 {+-} 0.006 (stat.) {+-} 0.009 (syst.). This result, when combined with the integral of the proton spin structure function measured in other experiments, confirms the fundamental Bjorken sum rule with O({alpha}{sub s}{sup 3}) corrections to within one standard deviation. This is a major success for perturbative Quantum Chromodynamics. Some ancillary results include the findings that the Ellis-Jaffe sum rule for the neutron is violated at the 2 {sigma} level, and that the total contribution of the quarks to the helicity of the nucleon is 0.36 {+-}more » 0.10. The strange sea polarization is estimated to be small and negative, {Delta}s = -0.07 {+-} 0.04.« less

Published
1993

29. Measurements of the electric and magnetic form factors of the neutron fromQ2=1.75 to 4.00 (GeV/c)2

Author

A. Lung, L. M. Stuart, P. E. Bosted, L. Andivahis, J. Alster, R. G. Arnold, C. C. Chang, F. S. Dietrich, W. R. Dodge, R. Gearhart, J. Gomez, K. A. Griffioen, R. S. Hicks, C. E. Hyde-Wright, C. Keppel, S. E. Kuhn, J. Lichtenstadt, R. A. Miskimen, G. A. Peterson, G. G. Petratos, S. E. Rock, S. H. Rokni, W. K. Sakumoto, M. Spengos, K. Swartz, Z. Szalata, and L. H. Tao

Subjects
General Physics and Astronomy
Published
1993

30. Measurements of the electric and magnetic form factors of the proton fromQ2=1.75 to 8.83 (GeV/c)2

Author

P. E. Bosted, Sayed Rokni, J. Alster, M. Spengos, L. M. Stuart, K. A. Griffioen, L. Andivahis, R. G. Arnold, L. H. Tao, C. E. Hyde-Wright, Sakumoto Wk, W. R. Dodge, J. Lichtenstadt, A. Lung, Z. M. Szalata, F. S. Dietrich, S. E. Rock, J. Gomez, G. G. Petratos, R. S. Hicks, R. A. Gearhart, G. A. Peterson, C. C. Chang, K. Swartz, S. E. Kuhn, R. A. Miskimen, and C. E. Keppel

Subjects
Scattering cross-section, Physics, Particle physics, Particle properties, Proton, Particle model, Quark model, Hadron, Form factor (quantum field theory), General Physics and Astronomy, Elementary particle, Vector meson dominance, Baryon, Combinatorics, Crystallography, Neutron, Nucleon
Abstract

The proton elastic form factors ${\mathit{G}}_{\mathit{E}\mathit{p}}$(${\mathit{Q}}^{2}$) and ${\mathit{G}}_{\mathit{M}\mathit{p}}$(${\mathit{Q}}^{2}$) have been extracted for ${\mathit{Q}}^{2}$=1.75 to 8.83 (GeV/c${)}^{2}$ via a Rosenbluth separation to ep elastic cross section measurements in the angular range 13\ifmmode^\circ\else\textdegree\fi{}\ensuremath{\le}\ensuremath{\theta}\ensuremath{\le}90\ifmmode^\circ\else\textdegree\fi{}. The ${\mathit{Q}}^{2}$ range covered more than doubles that of the existing data. For ${\mathit{Q}}^{2}$4 (GeV/c${)}^{2}$, where the data overlap with previous measurements, the total uncertainties have been reduced to 14% in ${\mathit{G}}_{\mathit{E}\mathit{p}}$ and 1.5% in ${\mathit{G}}_{\mathit{M}\mathit{p}}$. Results for ${\mathit{G}}_{\mathit{E}\mathit{p}}$(${\mathit{Q}}^{2}$) are consistent with the dipole fit ${\mathit{G}}_{\mathit{D}}$(${\mathit{Q}}^{2}$)=(1+${\mathit{Q}}^{2}$/0.71${)}^{\mathrm{\ensuremath{-}}2}$, while those for ${\mathit{G}}_{\mathit{M}\mathit{p}}$(${\mathit{Q}}^{2}$)/${\mathrm{\ensuremath{\mu}}}_{\mathit{p}}$${\mathit{G}}_{\mathit{D}}$(${\mathit{Q}}^{2}$) decrease smoothly from 1.05 to 0.92. Deviations from form factor scaling are observed up to 20%. The ratio ${\mathit{Q}}^{2}$${\mathit{F}}_{2}$/${\mathit{F}}_{1}$ is observed to approach a constant value for ${\mathit{Q}}^{2}$g3 (GeV/c${)}^{2}$. Comparisons are made to vector meson dominance, dimensional scaling, QCD sum rule, diquark, and constituent quark models, none of which fully characterize all the new data.

Published
1992

31. Virtual Compton Scattering and Neutral Pion Electroproduction in the Resonance Region up to the Deep Inelastic Region at Backward Angles

Author

Seigo Kato, H. Ueno, K. Wijesooriya, R. Di Salvo, L. C. Alexa, G. W. Miller, H. Voskanyan, C. Jutier, J. Jardillier, E. Voutier, J. A. Templon, G. Rutledge, B. Frois, D. G. Zainea, C. C. Chang, E. Chudakov, David L. Prout, G. Laveissière, T. Terasawa, Vincent Breton, Mauro Iodice, Bogdan Wojtsekhowski, K. S. Kumar, Latifa Elouadrhiri, J. O. Hansen, A. Gasparian, K. Arundell, Pavel Sorokin, Sebastien Incerti, Larry Weinstein, P. Grenier, R. W. Lourie, W. Kahl, J. Berthot, G. Audit, L. B. Auerbach, T. Pussieux, G. Fournier, William Bertozzi, A. Deur, P. Vernin, Pierre A.M. Guichon, Ronald Ransome, Kazushige Maeda, K. Kino, N. Degrande, Pete Markowitz, D. Rowntree, Z. Papandreou, R. L.J. van der Meer, A. T. Katramatou, T. Saito, Richard Madey, Paul Souder, P. M. Rutt, S. K. Nanda, Roberto Perrino, R. De Leo, D. S. Dale, S. Mehrabyan, S. Kerhoas, J. M. Finn, W. U. Boeglin, D. J. Margaziotis, R. I. Pomatsalyuk, A. Ketikyan, L. Todor, A. Leone, M. Baylac, S. Jaminion, Nilanga Liyanage, S. Malov, E. Burtin, M. Holtrop, Thomas E. Smith, Richard Wilson, G. E. Dodge, R. Holmes, J. Marroncle, D. Marchand, E. Tomasi-Gustaffson, S. Platchkov, J. S. Real, J. Martino, Raphael Noel Tieulent, G.I. Smirnov, J. P. Chen, R. Van de Vyver, G. M. Urciuoli, Branislav Vlahovic, R. A. Lindgren, J. J. LeRose, C. R. Howell, Justin I. McIntyre, J. R. Calarco, L. Tiator, L. Bimbot, Arijit Saha, K. Soldi, O. Ravel, Hiroaki Tsubota, A. Serdarevic, C. E. Hyde, Y. Roblin, J. Y. Mougey, G. M. Huber, F. Garibaldi, E. Cisbani, J. Gomez, V. Gorbenko, J. W. Watson, F. Renard, L. Cardman, B. D. Anderson, G. J. Lolos, M. B. Epstein, F. T. Baker, F. Merchez, P. Y. Bertin, Haiyan Gao, M. Liang, G. Quéméner, D. Neyret, N. d'Hose, S. Frullani, Charles Glashausser, M. Khayat, H. Breuer, D. M. Manley, J. Gao, L. Van Hoorebeke, G. G. Petratos, Z. E. Meziani, V. A. Punjabi, L. A. Ewell, Ronald Gilman, K. McCormick, H. Fonvieille, Z. L. Zhou, A. V. Glamazdin, S. Kox, Jing Zhao, C. F. Perdrisat, R. Michaels, C. Marchand, M. K. Jones, C. Furget, P. E. Ulmer, Kevin Fissum, M. Kuss, James J. Kelly, E. J. Brash, Laird Kramer, Shalev Gilad, C. W. de Jager, K. A. Aniol, E. A.J.M. Offermann, C. Cavata, S.S. Kamalov, G. J. Kumbartzki, A. J. Sarty, W. M. Zhang, R. Suleiman, J. Domingo, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), HALL A, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)

Subjects
Elastic scattering, Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Scattering, Compton scattering, Resonance, FOS: Physical sciences, Inelastic scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Deep inelastic scattering, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Pion, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment (nucl-ex), 010306 general physics, Nucleon, Nuclear Experiment
Abstract

We have made the first measurements of the virtual Compton scattering (VCS) process via the H$(e,e'p)\gamma$ exclusive reaction in the nucleon resonance region, at backward angles. Results are presented for the $W$-dependence at fixed $Q^2=1$ GeV$^2$, and for the $Q^2$-dependence at fixed $W$ near 1.5 GeV. The VCS data show resonant structures in the first and second resonance regions. The observed $Q^2$-dependence is smooth. The measured ratio of H$(e,e'p)\gamma$ to H$(e,e'p)\pi^0$ cross sections emphasizes the different sensitivity of these two reactions to the various nucleon resonances. Finally, when compared to Real Compton Scattering (RCS) at high energy and large angles, our VCS data at the highest $W$ (1.8-1.9 GeV) show a striking $Q^2$- independence, which may suggest a transition to a perturbative scattering mechanism at the quark level., Comment: 20 pages, 8 figures. To appear in Phys.Rev.C

Published
2009

32. 3He spin-dependent cross sections and sum rules

Author

M. Liang, E. Goldberg, W. Glöckle, A. V. Glamazdin, Z. Chai, D. S. Brown, A. Gasparian, K. Kramer, G. G. Petratos, Z. E. Meziani, Ronald Ransome, R. Skibiński, D. Rowntree, B. Humensky, Koji Takahashi, Seonho Choi, H. Fonvieille, E. W. Hughes, H. Voskanian, E. J. Brash, L. B. Auerbach, R. Michaels, I. K. Kominis, J. P. Chen, S. Malov, E. Burtin, M. Finn, G. Jones, Andreas Nogga, Hiroyuki Kamada, J. Gomez, S. Scopetta, S. Jensen, J. R. Calarco, Paul Souder, G. M. Urciuoli, Henryk Witała, Nilanga Liyanage, R. DiSalvo, D. Pripstein, M. Rvachev, C. E. Jones, Shalev Gilad, S. Strauch, C. W. de Jager, Kevin Fissum, Ronald Gilman, K. McCormick, J. C. Yang, T. Averett, Wolfgang Korsch, R. Suleiman, Bogdan Wojtsekhowski, T. Black, B. Bertozzi, R. L.J. van der Meer, S. Frullani, B. Hersman, G. M. Huber, F. Garibaldi, J. J. LeRose, D. Prout, P. A. Zolnierczuk, R. Holmes, Z. Papandreou, F. Sabatié, X. Jiang, V. Gorbenko, M. K. Jones, Mauro Iodice, A. Saha, A. Ketikyan, S. Teijiro, G. Salme, Charles Glashausser, T. Saito, Haiyan Gao, M. Amarian, C. Jutier, J. Berthot, Y. Roblin, T. Pavlin, Hiroshi Ueno, Jiansong Gao, G. Laveissière, M. Kuss, K. S. Kumar, Gordon D. Cates, E. Lakuriqi, E. Cisbani, F. Xiong, A. Deur, R. D. McKeown, John C. Mitchell, Jacek Golak, J. Marroncle, E. Pace, C. Ciofi degli Atti, G. Kumbartzki, G. J. Lolos, E. Chudakov, J. O. Hansen, P. Djawotho, Karl Slifer, P.Y. Bertin, W. Xu, Sebastien Incerti, P. Vernin, Baile Zhang, L. Todor, Sonja Dieterich, Hiroaki Tsubota, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), E94010, and Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear reaction, nuclear spin, sum rules, polarisation in nuclear reactions and scattering, Nuclear Theory, General Physics and Astronomy, FOS: Physical sciences, Impulse (physics), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Settore FIS/04 - Fisica Nucleare e Subnucleare, nuclear structure theory, Helium-3, 0103 physical sciences, ddc:550, electron-nucleus scattering, Nuclear Experiment (nucl-ex), 010306 general physics, Spin (physics), Nuclear Experiment, Physics, Magnetic moment, 010308 nuclear & particles physics, nuclear resonances, Nuclear structure, Three-body problem, structure functions, High Energy Physics::Experiment, Atomic physics, nulei with mass number 1 to 5, Nucleon
Abstract

We present a measurement of the spin-dependent cross sections for the \vec{^3He}(\vec{e},e')X} reaction in the quasielastic and resonance regions at four-momentum transfer 0.1 < Q^2< 0.9 GeV^2. The spin-structure functions have been extracted and used to evaluate the nuclear Burkhardt--Cottingham and extended GDH sum rules for the first time. Impulse approximation and exact three-body Faddeev calculations are also compared to the data in the quasielastic region., Final version

Published
2008

33. Transverse electrodisintegration of the deuteron in the threshold region at highQ2

Author

J. Lichtenstadt, J. Alster, F. S. Dietrich, R. A. Gearhart, G. deChambrier, G. A. Peterson, D. Benton, G. G. Petratos, R. S. Hicks, P. E. Bosted, van Bibber K, M. Frodyma, A. Lung, A. A. Rahbar, A. Hotta, Z. M. Szalata, J. Lambert, S. E. Rock, A. T. Katramatou, B. Debebe, R. G. Arnold, and L. Clogher

Subjects
Quark, Elastic scattering, Physics, Nuclear reaction, Nuclear and High Energy Physics, Scattering, Computer Science::Information Retrieval, Nuclear Theory, Impulse (physics), Inelastic scattering, Charged particle, Deuterium, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment
Abstract

Cross sections for 180{degree} deuteron electrodisintegration have been measured near threshold for the {ital Q}{sup 2} range 1.21 to 2.77 (GeV/{ital c}){sup 2}. The data are compared to several nonrelativistic meson-nucleon and hybrid quark-hadron models. The data are in strong disagreement with the impulse approximation, indicating the importance of non-nucleonic degrees of freedom. None of the models are in good agreement with the data at all values of {ital Q}{sup 2}. The ratio {ital W}{sub 1}/{ital W}{sub 2} of inelastic structure functions has been extracted using previous forward angle data and is found to decrease strongly near threshold, also indicating the importance of interaction effects.

Published
1990

34. Extraction of the neutron magnetic form factor from quasielastic3He→(e→,e') atQ2=0.1−0.6 (GeV/c)2

Author

B. Anderson, L. Auberbach, T. Averett, W. Bertozzi, T. Black, J. Calarco, L. Cardman, G. D. Cates, Z. W. Chai, J. P. Chen, Seonho Choi, E. Chudakov, S. Churchwell, G. S. Corrado, C. Crawford, D. Dale, A. Deur, P. Djawotho, D. Dutta, J. M. Finn, H. Gao, R. Gilman, A. V. Glamazdin, C. Glashausser, W. Glöckle, J. Golak, J. Gomez, V. G. Gorbenko, J.-O. Hansen, F. W. Hersman, D. W. Higinbotham, R. Holmes, C. R. Howell, E. Hughes, B. Humensky, S. Incerti, C. W. de Jager, J. S. Jensen, X. Jiang, C. E. Jones, M. Jones, R. Kahl, H. Kamada, A. Kievsky, I. Kominis, W. Korsch, K. Kramer, G. Kumbartzki, M. Kuss, E. Lakuriqi, M. Liang, N. Liyanage, J. LeRose, S. Malov, D. J. Margaziotis, J. W. Martin, K. McCormick, R. D. McKeown, K. McIlhany, Z.-E. Meziani, R. Michaels, G. W. Miller, J. Mitchell, S. Nanda, E. Pace, T. Pavlin, G. G. Petratos, R. I. Pomatsalyuk, D. Pripstein, D. Prout, R. D. Ransome, Y. Roblin, M. Rvachev, A. Saha, G. Salmè, M. Schnee, J. Seely, T. Shin, K. Slifer, P. A. Souder, S. Strauch, R. Suleiman, M. Sutter, B. Tipton, L. Todor, M. Viviani, B. Vlahovic, J. Watson, C. F. Williamson, H. Witała, B. Wojtsekhowski, F. Xiong, W. Xu, J. Yeh, and P. Żołnierczuk

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Plane wave, Elementary particle, 01 natural sciences, 7. Clean energy, Nuclear physics, Helium-3, 0103 physical sciences, Magnetic form factor, Neutron, Nuclear Experiment, 010306 general physics, Nucleon, Isotopes of helium
Abstract

We have measured the transverse asymmetry A{sub T{sup '}} in the quasielastic {sup 3}He-vector(e-vector,e{sup '}) process with high precision at Q{sup 2} values from 0.1 to 0.6 (GeV/c){sup 2}. The neutron magnetic form factor G{sub M}{sup n} was extracted at Q{sup 2} values of 0.1 and 0.2 (GeV/c){sup 2} using a nonrelativistic Faddeev calculation which includes both final-state interactions (FSI) and meson-exchange currents (MEC). Theoretical uncertainties due to the FSI and MEC effects were constrained with a precision measurement of the spin-dependent asymmetry in the threshold region of {sup 3}He-vector(e-vector,e{sup '}). We also extracted the neutron magnetic form factor G{sub M}{sup n} at Q{sup 2} values of 0.3 to 0.6 (GeV/c){sup 2} based on plane wave impulse approximation calculations.

Published
2007

35. Publisher's Note: Proton elastic form factor ratios toQ2=3.5GeV2by polarization transfer [Phys. Rev. C 71, 055202 (2005)]

Author

R. J. Woo, Justin I. McIntyre, K. Wijesooriya, M. Khayat, P.Y. Bertin, C. F. Perdrisat, E. A. J. M. Offermann, Riad Suleiman, Y. Roblin, X. Jiang, A. Gasparian, R. A. Lindgren, J. J. LeRose, L. S. Cardman, J. Berthot, S. Malov, P. Vernin, J. A. Templon, L. Bimbot, V. Gorbenko, B. Diederich, D. S. Brown, Bogdan Wojtsekhowski, L. Todor, S. K. Nanda, S. Churchwell, Z. L. Zhou, Richard Madey, M. K. Jones, N. M. Piskunov, Shalev Gilad, E. Chudakov, K. A. Aniol, D. S. Dale, H. Voskanyan, Nilanga Liyanage, Brian Raue, G. M. Huber, F. Garibaldi, T. Saito, George Dan Zainea, G. G. Petratos, M. Kuss, Laird Kramer, A. V. Glamazdin, Z. Chai, G. Rutledge, David L. Prout, G. J. Kumbartzki, E. Lakuriki, G. J. Lolos, M. B. Epstein, G. Laveissière, B. D. Milbrath, C. Glashausser, Mauro Iodice, Lubomir Pentchev, S. Frullani, J. Y. Mougey, R. Roche, R. Michaels, A. Deur, R. L. Meer, A. J. Sarty, J. P. Chen, C. W. Jager, M. Liang, G. Quéméner, Branislav Vlahovic, H. Fonvieille, Andre Fleck, G. M. Urciuoli, C. R. Howell, J. R. Calarco, C. C. Chang, E. J. Brash, A. Green, D. J. Margaziotis, William Bertozzi, T. Smith, Ronald Gilman, J. Gao, R. I. Pomatsalyuk, Pavel Sorokin, Pete Markowitz, P. E. Ulmer, Kevin Fissum, W. Kahl, R. De Leo, K. McCormick, W.U. Boeglin, S. Strauch, G. M. Gerstner, J.-O. Hansen, Z. Papandreou, A. Besson, P. M. Rutt, Ronald Ransome, J. Domingo, F. Xiong, A. Saha, S. Jaminion, E. Cisbani, F. T. Baker, V. A. Punjabi, Jonatan Piedra Gomez, R. Macri, James J. Kelly, L. A. Ewell, and K. Takahashi

Subjects
Physics, Elastic scattering, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, Polarization (waves), 01 natural sciences, Typographical error
Abstract

This paper was published online on 20 May 2005 without several of the authors' corrections incorporated. Equation (13) has been replaced. The captions of Figs. 16--18 have also been replaced. Typographical errors on pages 4, 6, 14, 15, 18, 19, 22, and 24 have all been corrected. The paper has been corrected as of 8 June 2005. The text is correct in the printed version of the journal.

Published
2005

36. Proton elastic form factor ratios toQ2=3.5GeV2by polarization transfer

Author

R. I. Pomatsalyuk, A. V. Glamazdin, Z. Chai, K. Wijesooriya, H. Fonvieille, M. Liang, G. Quéméner, Salvatore Frullani, C. F. Perdrisat, A. Gasparian, C. R. Howell, J. R. Calarco, K. McCormick, A. Green, J. A. Templon, P. Vernin, D. J. Margaziotis, Bogdan Wojtsekhowski, J. Y. Mougey, J. Berthot, F. T. Baker, E. J. Brash, L. Todor, R. Roche, J. Gao, M. Khayat, P.Y. Bertin, G. G. Petratos, S. K. Nanda, A. Deur, Z. L. Zhou, A. J. Sarty, R. J. Woo, A. Saha, L. Cardman, S. Jaminion, W. Kahl, B. Diederich, P. E. Ulmer, Franco Garibaldi, K. Takahashi, T. Saito, R. A. Lindgren, J. J. LeRose, D. S. Brown, G. M. Huber, Y. Roblin, G. M. Gerstner, R. Suleiman, V. Gorbenko, X. Jiang, V. A. Punjabi, S. Strauch, M. B. Epstein, Z. Papandreou, A. Besson, S. Churchwell, Charles Glashausser, E. Chudakov, Shalev Gilad, G. Laveissière, R. Madey, William Bertozzi, D. S. Dale, C. W. de Jager, K. A. Aniol, J. O. Hansen, G. M. Urciuoli, G. Kumbartzki, E. A.J.M. Offermann, Andre Fleck, Pete Markowitz, G. J. Lolos, Jian-Ping Chen, H. Voskanyan, Brian Raue, R. De Leo, S. Malov, P. M. Rutt, R. L.J. van der Meer, R. Macri, C. C. Chang, David L. Prout, J. Gomez, Pavel Sorokin, L. Bimbot, T. P. Smith, G. Rutledge, E. Lakuriki, B. D. Milbrath, M. K. Jones, N. M. Piskunov, M. Kuss, Ronald Gilman, M. Iodice, L. A. Ewell, James J. Kelly, F. Xiong, L. Pentchev, Ronald Ransome, W. U. Boeglin, Nilanga Liyanage, Branislav Vlahovic, E. Cisbani, Laird Kramer, Justin I. McIntyre, J. Domingo, Kevin Fissum, George Dan Zainea, and R. Michaels

Subjects
Physics, Quark, Nuclear and High Energy Physics, Photon, Proton, 010308 nuclear & particles physics, Polarimeter, Electron, Polarization (waves), 01 natural sciences, Nuclear physics, Transverse plane, Magnetization, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

The ratio of the proton elastic electromagnetic form factors, GEp/GMp, was obtained by measuring Pt and P, the transverse and longitudinal recoil proton polarization components, respectively, for the elastic epepreaction in the four-momentum transfer squared range of 0.5 to 3.5 GeV2. In the single-photon exchange approximation, GEp/GMp is directly proportional to Pt/P. The simultaneous measurement of Pt and P in a polarimeter reduces systematic uncertainties. The results for GEp/GMp show a systematic decrease with increasing Q2, indicating for the first time a definite difference in the distribution of charge and magnetization in the proton. The data have been reanalyzed and their systematic uncertainties have become significantly smaller than those reported previously. (Less)

Published
2005

37. Dynamics of the quasielasticO16(e,e′p)reaction atQ2≈0.8(GeV∕c)2

Author

A. V. Glamazdin, E. A.J.M. Offermann, Seigo Kato, D. M. Manley, H. Fonvieille, R. Roche, S. Malov, P.Y. Bertin, E. Burtin, M. Holtrop, J. Gomez, Jing Zhao, Nilanga Liyanage, R. W. Lourie, R. Michaels, S. Jaminion, R. Holmes, T. Terasawa, Vincent Breton, D. J. Margaziotis, Branislav Vlahovic, H. Voskanyan, C. Jutier, W. Kahl, F. T. Baker, C. F. Perdrisat, Leonid Levchuk, J. M. Finn, R. I. Pomatsalyuk, V. A. Punjabi, K. Joo, David L. Prout, Olivier Ravel, H. Ueno, Bogdan Wojtsekhowski, K. McCormick, P. Vernin, P. E. Ulmer, S. K. Nanda, S. Kerhoas, J. Y. Mougey, L. B. Auerbach, A. Leone, T. Pussieux, L. S. Cardman, Y. Roblin, S. van Verst, R. A. Lindgren, J. J. LeRose, G. M. Huber, Z. Papandreou, J. A. Templon, F. Garibaldi, T. Saito, M. Khayat, Dimitri Debruyne, P. M. Rutt, V. Gorbenko, B. Frois, Kevin Fissum, D. Neyret, G. G. Petratos, A. Saha, Z. E. Meziani, B. Diederich, C. E. Hyde-Wright, G. Rutledge, L. Bimbot, James J. Kelly, K. Kino, M. Liang, Wolfgang Korsch, J. S. McCarthy, T. P. Smith, G. Quéméner, S. Platchkov, Mauro Iodice, Kazushige Maeda, L. Todor, K. Wijesooriya, Justin I. McIntyre, J. W. Watson, Larry Weinstein, J. Martino, C. R. Howell, Hiroaki Tsubota, J. P. Chen, J. R. Calarco, N. d'Hose, Jan Ryckebusch, Z. L. Zhou, G. M. Urciuoli, D. G. Zainea, Ronald Gilman, Ronald Ransome, R. L.J. van der Meer, C. C. Chang, D. Rowntree, K. S. Kumar, J. Gao, B. D. Anderson, G. J. Lolos, M. B. Epstein, Pavel Sorokin, Laird Kramer, G. J. Kumbartzki, G. Laveissière, M. K. Jones, A. Gasparian, R. Madey, William Bertozzi, W. U. Boeglin, Pete Markowitz, D. S. Dale, M. Khandaker, V. Zeps, Roberto Perrino, R. De Leo, E. Cisbani, J. Berthot, S. Frullani, H. Breuer, E. J. Brash, J. R. Vignote, T. P. Gorringe, J. M. Udías, F. W. Hersman, L. A. Ewell, J. Domingo, Gordon D. Cates, Paul Souder, A. Serdarevic-Offermann, A. Deur, C. Cavata, A. Soldi, J.E. Ducret, A. J. Sarty, P. Djawotho, C. Glashausser, R. Suleiman, Shalev Gilad, C. W. de Jager, and K. A. Aniol

Subjects
Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, media_common.quotation_subject, Two-body problem, 01 natural sciences, Asymmetry, Eikonal approximation, Nuclear physics, Classical mechanics, 0103 physical sciences, Isobar, 010306 general physics, Relativistic quantum chemistry, Glauber, Oxygen-16, media_common
Abstract

The physics program in Hall A at Jefferson Lab commenced in the summer of 1997 with a detailed investigation of the ^(16)O(e,e′p) reaction in quasielastic, constant (q,ω) kinematics at Q^2≈0.8(GeV/c)^2, q≈1GeV/c, and ω≈445MeV. Use of a self-calibrating, self-normalizing, thin-film waterfall target enabled a systematically rigorous measurement. Five-fold differential cross-section data for the removal of protons from the 1p-shell have been obtained for 0

Published
2004

38. Measurement of the Generalized Polarizabilities of the Proton in Virtual Compton Scattering atQ2=0.92and1.76 GeV2

Author

G. Laveissière, L. Todor, N. Degrande, S. Jaminion, C. Jutier, R. Di Salvo, L. Van Hoorebeke, L. C. Alexa, B. D. Anderson, K. A. Aniol, K. Arundell, G. Audit, L. Auerbach, F. T. Baker, M. Baylac, J. Berthot, P. Y. Bertin, W. Bertozzi, L. Bimbot, W. U. Boeglin, E. J. Brash, V. Breton, H. Breuer, E. Burtin, J. R. Calarco, L. S. Cardman, C. Cavata, C.-C. Chang, J.-P. Chen, E. Chudakov, E. Cisbani, D. S. Dale, C. W. de Jager, R. De Leo, A. Deur, N. d'Hose, G. E. Dodge, J. J. Domingo, L. Elouadrhiri, M. B. Epstein, L. A. Ewell, J. M. Finn, K. G. Fissum, H. Fonvieille, G. Fournier, B. Frois, S. Frullani, C. Furget, H. Gao, J. Gao, F. Garibaldi, A. Gasparian, S. Gilad, R. Gilman, A. Glamazdin, C. Glashausser, J. Gomez, V. Gorbenko, P. Grenier, P. A. M. Guichon, J. O. Hansen, R. Holmes, M. Holtrop, C. Howell, G. M. Huber, C. E. Hyde-Wright, S. Incerti, M. Iodice, J. Jardillier, M. K. Jones, W. Kahl, S. Kato, A. T. Katramatou, J. J. Kelly, S. Kerhoas, A. Ketikyan, M. Khayat, K. Kino, S. Kox, L. H. Kramer, K. S. Kumar, G. Kumbartzki, M. Kuss, A. Leone, J. J. LeRose, M. Liang, R. A. Lindgren, N. Liyanage, G. J. Lolos, R. W. Lourie, R. Madey, K. Maeda, S. Malov, D. M. Manley, C. Marchand, D. Marchand, D. J. Margaziotis, P. Markowitz, J. Marroncle, J. Martino, K. McCormick, J. McIntyre, S. Mehrabyan, F. Merchez, Z. E. Meziani, R. Michaels, G. W. Miller, J. Y. Mougey, S. K. Nanda, D. Neyret, E. A. J. M. Offermann, Z. Papandreou, B. Pasquini, C. F. Perdrisat, R. Perrino, G. G. Petratos, S. Platchkov, R. Pomatsalyuk, D. L. Prout, V. A. Punjabi, T. Pussieux, G. Quémenér, R. D. Ransome, O. Ravel, J. S. Real, F. Renard, Y. Roblin, D. Rowntree, G. Rutledge, P. M. Rutt, A. Saha, T. Saito, A. J. Sarty, A. Serdarevic, T. Smith, G. Smirnov, K. Soldi, P. Sorokin, P. A. Souder, R. Suleiman, J. A. Templon, T. Terasawa, R. Tieulent, E. Tomasi-Gustaffson, H. Tsubota, H. Ueno, P. E. Ulmer, G. M. Urciuoli, M. Vanderhaeghen, R. Van De Vyver, R. L. J. Van der Meer, P. Vernin, B. Vlahovic, H. Voskanyan, E. Voutier, J. W. Watson, L. B. Weinstein, K. Wijesooriya, R. Wilson, B. B. Wojtsekhowski, D. G. Zainea, W-M. Zhang, J. Zhao, and Z.-L. Zhou

Subjects
Physics, Proton, 010308 nuclear & particles physics, Scattering, Momentum transfer, Compton scattering, General Physics and Astronomy, 01 natural sciences, 7. Clean energy, Nuclear physics, Paramagnetism, Dipole, Pion, Polarizability, 0103 physical sciences, Atomic physics, 010306 general physics
Abstract

We report a virtual Compton scattering study of the proton at low c.m. energies. We have determined the structure functions P(LL)-P(TT)/epsilon and P(LT), and the electric and magnetic generalized polarizabilities (GPs) alpha(E)(Q2) and beta(M)(Q2) at momentum transfer Q(2)=0.92 and 1.76 GeV2. The electric GP shows a strong falloff with Q2, and its global behavior does not follow a simple dipole form. The magnetic GP shows a rise and then a falloff; this can be interpreted as the dominance of a long-distance diamagnetic pion cloud at low Q2, compensated at higher Q2 by a paramagnetic contribution from piN intermediate states.

Published
2004

39. Parity-violating electroweak asymmetry ine⃗pscattering

Author

J. Jardillier, Baris T. Tonguc, I. Younus, G. Rutledge, V. A. Punjabi, Mauro Iodice, F. Marie, R. Michaels, G. M. Urciuoli, D. J. Margaziotis, T. Pussieux, M. Leuschner, I. K. Kominis, X. Jiang, Justin I. McIntyre, R. De Leo, M. Coman, K. Wijesooriya, J. R. Calarco, P. Mastromarino, Andre Fleck, N. Falletto, T. Averett, B. Frois, Richard Madey, Marcus Spradlin, T. B. Humensky, Paul Souder, W. Xu, Olfred Hansen, T. Teresawa, D. Relyea, J.P. Jorda, Ronald Ransome, Bogdan Wojtsekhowski, James J. Kelly, J. Gao, J. Roche, M. Liang, G. Quéméner, B. D. Milbrath, F. Sabatié, A. Gasparian, J. A. Templon, D. W. Higinbotham, C. C. Chang, Kevin Fissum, M. B. Epstein, K. S. Kumar, J. Thompson, R. J. Woo, L. Todor, Gordon D. Cates, R. I. Pomatsalyuk, D. S. Dale, R. W. Lourie, J. M. Finn, A. Saha, John C. Mitchell, R. Suleiman, G. W. Miller, Daijin Kim, C. Jutier, R. Holmes, Sebastien Incerti, S. Malov, E. Burtin, M. Holtrop, W. Kahl, S. Strauch, P. E. Ulmer, P. Markowitz, S. Frullani, M. J. Kim, P. M. Rutt, Y. Roblin, D. Lhuillier, David L. Prout, G. M. Gerstner, Min Suk Kim, Jian-Ping Chen, F. Garibaldi, D. S. Armstrong, J. J. LeRose, K. Kramer, V. Gorbenko, M. Rvachev, J. Martino, G. G. Petratos, Edgar E. Kooijman, Z. E. Meziani, C. W. de Jager, K. A. Aniol, D. Neyret, Raphael Noel Tieulent, M. Baylac, F. W. Hersman, L. A. Ewell, J. S. Price, C. Cavata, Nilanga Liyanage, A. V. Glamazdin, Z. Chai, Richard Wilson, Branislav Vlahovic, E. Cisbani, J. Gomez, C. Zhang, L. Morand, Ronald Gilman, K. McCormick, E. Chudakov, P. Djawotho, Stephanie Escoffier, M. K. Jones, C. Pedrisat, M. Kuss, and A. Deur

Subjects
Nuclear reaction, Elastic scattering, Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, media_common.quotation_subject, Hadron, Elementary particle, 01 natural sciences, Asymmetry, Baryon, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, media_common, Lepton
Abstract

We have measured the parity-violating electroweak asymmetry in the elastic scattering of polarized electrons from protons. Significant contributions to this asymmetry could arise from the contributions of strange form factors in the nucleon. The measured asymmetry is $A=\ensuremath{-}15.05\ifmmode\pm\else\textpm\fi{}0.98(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.56(\mathrm{syst})\phantom{\rule{0.3em}{0ex}}\mathrm{ppm}$ at the kinematic point $⟨{\ensuremath{\theta}}_{\mathrm{lab}}⟩=12.3\ifmmode^\circ\else\textdegree\fi{}$ and $⟨{Q}^{2}⟩=0.477\phantom{\rule{0.3em}{0ex}}{(\mathrm{GeV}∕c)}^{2}$. Based on these data as well as data on electromagnetic form factors, we extract the linear combination of strange form factors ${G}_{E}^{s}+0.392{G}_{M}^{s}=0.014\ifmmode\pm\else\textpm\fi{}0.020\ifmmode\pm\else\textpm\fi{}0.010$, where the first error arises from this experiment and the second arises from the electromagnetic form factor data. This paper provides a full description of the special experimental techniques employed for precisely measuring the small asymmetry, including the first use of a strained GaAs crystal and a laser-Compton polarimeter in a fixed target parity-violation experiment.

Published
2004

40. Measurement of the Generalized Forward Spin Polarizabilities of the Neutron

Author

G. G. Petratos, Arijit Saha, Z. E. Meziani, John C. Mitchell, W. Xu, M. Liang, Gordon D. Cates, T. Black, E. Lakuriqi, E. J. Brash, C. E. Jones, J. M. Finn, R. Holmes, T. Averett, Shalev Gilad, Baile Zhang, T. Saito, C. W. de Jager, S. Strauch, A. Deur, J. R. Calarco, B. Humensky, Seonho Choi, R. D. McKeown, H. Voskanian, F. Garibaldi, J. O. Hansen, Hiroshi Ueno, I. K. Kominis, L. Todor, Hiroaki Tsubota, D. S. Brown, Y. Roblin, X. Jiang, G. J. Lolos, P. Djawotho, Sonja Dieterich, A. Gasparian, G. J. Kumbartzki, Karl Slifer, A. Ketikyan, J. Berthot, Ronald Gilman, J. C. Yang, S. Malov, E. Burtin, Paul Souder, S. Jensen, Sebastien Incerti, G. Laveissière, G. Jones, Jiansong Gao, Bogdan Wojtsekhowski, Charles Glashausser, L. B. Auerbach, P.Y. Bertin, K. McCormick, S. Frullani, B. Hersman, D. Pripstein, J. J. LeRose, P. Vernin, H. Fonvieille, V. Gorbenko, Jian-Ping Chen, E. W. Hughes, Wolfgang Korsch, S. Teijiro, G. M. Huber, C. Jutier, M. K. Jones, Haiyan Gao, K. Kramer, J. Marroncle, David L. Prout, Nilanga Liyanage, F. Sabatié, R. Michaels, R. L.J. van der Meer, M. Rvachev, A. V. Glamazdin, Z. Chai, M. Kuss, R. DiSalvo, E. Chudakov, Kevin Fissum, R. Suleiman, E. Cisbani, P. A. Zolnierczuk, J. Gomez, M. Amarian, F. Xiong, Ronald Ransome, D. Rowntree, Koji Takahashi, Z. Papandreou, T. Pavlin, K. S. Kumar, Mauro Iodice, G. M. Urciuoli, William Bertozzi, E. Goldberg, Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E94010

Subjects
Quantum chromodynamics, Physics, Chiral perturbation theory, Spin polarization, 010308 nuclear & particles physics, General Physics and Astronomy, 01 natural sciences, High Energy Physics - Experiment, Baryon, Polarizability, Quantum mechanics, Quantum electrodynamics, 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Perturbation theory, 010306 general physics, Nucleon, Nuclear Experiment, Spin-½
Abstract

The generalized forward spin polarizabilities $\gamma_0$ and $\delta_{LT}$ of the neutron have been extracted for the first time in a $Q^2$ range from 0.1 to 0.9 GeV$^2$. Since $\gamma_0$ is sensitive to nucleon resonances and $\delta_{LT}$ is insensitive to the $\Delta$ resonance, it is expected that the pair of forward spin polarizabilities should provide benchmark tests of the current understanding of the chiral dynamics of QCD. The new results on $\delta_{LT}$ show significant disagreement with Chiral Perturbation Theory calculations, while the data for $\gamma_0$ at low $Q^2$ are in good agreement with a next-to-lead order Relativistic Baryon Chiral Perturbation theory calculation. The data show good agreement with the phenomenological MAID model., Comment: 5 pages, 2 figures, corrected typo in author name, published in PRL

Published
2004

41. Backward electroproduction ofπ0mesons on protons in the region of nucleon resonances at four momentum transfer squaredQ2=1.0GeV2

Author

P.Y. Bertin, M. K. Jones, B. D. Anderson, G. J. Lolos, M. B. Epstein, S. Frullani, R. W. Lourie, Jing Zhao, W. Kahl, M. Kuss, J. W. Watson, Y. Roblin, Bogdan Wojtsekhowski, William Bertozzi, L. S. Cardman, D. Neyret, S. Jaminion, R. Michaels, S. Platchkov, F. T. Baker, H. Ueno, Pete Markowitz, R. Di Salvo, T. Terasawa, Vincent Breton, M. Khayat, J. Martino, Raphael Noel Tieulent, Sebastien Incerti, A. Saha, L. B. Auerbach, E. J. Brash, G. E. Dodge, V. A. Punjabi, R. A. Lindgren, Richard Madey, G. J. Kumbartzki, G. Laveissière, Z. Papandreou, J. J. LeRose, P. M. Rutt, O. Ravel, Roberto Perrino, R. De Leo, D. J. Margaziotis, J. A. Templon, Ronald Ransome, D. Rowntree, M. Baylac, J. P. Chen, A. Deur, P. Vernin, B. Frois, G. G. Petratos, Z. E. Meziani, K. Kino, E. Chudakov, J. O. Hansen, Justin I. McIntyre, R. I. Pomatsalyuk, K. Wijesooriya, Hiroaki Tsubota, A. Ketikyan, Z. L. Zhou, K. Soldi, A. Serdarevic, L. Bimbot, H. Breuer, M. Liang, R. Van de Vyver, G. M. Urciuoli, A. T. Katramatou, L. C. Alexa, G. Quéméner, V. Gorbenko, F. Renard, N. d'Hose, S. K. Nanda, S. Malov, E. Burtin, J. Domingo, C. R. Howell, J. R. Calarco, J. M. Finn, S. Kerhoas, M. Holtrop, J. Gomez, Thomas E. Smith, C. F. Perdrisat, C. Glashausser, E. Cisbani, W. U. Boeglin, Philippe Grenier, Latifa Elouadrhiri, G. Audit, A. Gasparian, C. E. Hyde-Wright, L. Todor, A. Leone, L. Tiator, S. Mehrabyan, L. A. Ewell, Kazushige Maeda, C. Furget, D. M. Manley, Kevin Fissum, D. G. Zainea, J. Jardillier, J. Gao, K. Arundell, R. Holmes, G. Rutledge, C. C. Chang, L. Van Hoorebeke, K. S. Kumar, Ronald Gilman, K. McCormick, Mauro Iodice, Nilanga Liyanage, H. Fonvieille, Pierre A.M. Guichon, Pavel Sorokin, Larry Weinstein, P. E. Ulmer, Paul Souder, A. V. Glamazdin, Haiyan Gao, R. L.J. van der Meer, S. Kox, G. M. Huber, F. Garibaldi, T. Saito, Richard Wilson, Laird Kramer, J. Y. Mougey, E. Voutier, Branislav Vlahovic, F. Merchez, G. Fournier, James J. Kelly, C. Marchand, Seigo Kato, G. W. Miller, H. Voskanyan, C. Jutier, David L. Prout, T. Pussieux, W. M. Zhang, J. Berthot, R. Suleiman, C. Cavata, S.S. Kamalov, G. Smirnov, A. J. Sarty, Shalev Gilad, C. W. de Jager, K. A. Aniol, E. A.J.M. Offermann, N. Degrande, J. Marroncle, D. Marchand, E. Tomasi-Gustaffson, J. S. Real, and D. S. Dale

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Nuclear Theory, Hadron, Momentum transfer, Sigma, 01 natural sciences, Nuclear physics, Baryon, Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, Lepton
Abstract

Exclusive electroproduction of pi{sup 0} mesons on protons in the backward hemisphere has been studied at Q2 = 1.0 GeV2 by detecting protons in the forward direction in coincidence with scattered electrons from the 4 GeV electron beam in Jefferson Lab's Hall A. The data span the range of the total (gamma*p) center-of-mass energy W from the pion production threshold to W = 2.0 GeV. The differential cross sections sigma{sub T} + epsilon sigma{sub L}, sigma{sub TL}, and sigma{sub TT} were separated from the azimuthal distribution and are presented together with the MAID and SAID parameterizations.

Published
2004

42. Basic instrumentation for Hall A at Jefferson Lab

Author

T. Pussieux, Paul Souder, J. H. Mitchell, Y. Roblin, O. Ravel, E. Chudakov, K. A. Griffioen, C. Cavata, J. A. Templon, H. F. Ibrahim, J. S. McCarthy, M. A. Stevens, D. P. Watts, B. Frois, W. J. Schneider, Dipangkar Dutta, R. Di Salvo, R. I. Pomatsalyuk, A. Soldi, G. J. Kumbartzki, Arijit Saha, N. Colombel, J. Berthot, Jing Zhao, A. J. Sarty, B. D. Anderson, J. Martine, M. Coman, R. Michaels, M. B. Epstein, R. W. Lourie, J. O. Hansen, N. Degrande, J. Mclntyre, John Arrington, L. Zhu, W. Kahl, Bogdan Wojtsekhowski, P. Djawotho, M. Leuschner, William Bertozzi, K. A. Aniol, A. Gasparian, Karl Slifer, Jrm Annand, C. F. Perdrisat, D. Pripstein, M. Baylac, S. Kox, X. Jiang, K. Kramer, H. Breuer, David Hamilton, Jian-Ping Chen, T. Averett, L. B. Auerbach, G. A. Rutledge, G. Quéméner, Stephanie Escoffier, P.Y. Bertin, R. Suleiman, R. Carr, Pete Markowitz, A. Deur, Z. Papandreou, R. L. Walter, R. D. McKeown, T. P. Gorringe, M. Rvachev, R. Holmes, S. Churchwell, J. Marroncle, S. Platchkov, M. Khandaker, M. Liang, L. Pierangeli, K. Kino, A. Ketikyan, Kevin Fissum, F. W. Hersman, J. LeRose, F. Giuliani, P. E. Ulmer, Roberto Perrino, R. De Leo, J. Gao, L. A. Ewell, S. Jensen, R. Crateri, Shalev Gilad, C. W. de Jager, D. Lhuillier, J.E. Ducret, M. Gricia, R. Iommi, F. Sabatavenere, P. A. Zolnierczuk, K. Wijesooriya, Alan M. Nathan, D. Rowntree, E. Voutier, H. Holmgren, S. K. Nanda, D. G. Meekins, K. S. Egiyan, C. R. Howell, A. Serdarevic-Offermann, Hiroaki Tsubota, D. G. Zainea, J. R. Calarco, S. Esp, T. Terasawa, Vincent Breton, C. C. Chang, J. Domingo, T. Black, A. T. Katramatou, S. Kerhoas, F. Santavenere, J. Y. Mougey, R. Van de Vyver, G. M. Urciuoli, Seigo Kato, G. M. Huber, B. Reitz, E. J. Beise, K. S. Kumar, F. Garibaldi, Pavel Sorokin, G. J. Lolos, M. Lucentini, J. Segal, H. Xiang, D. V. Boykin, W. U. Boeglin, C. Glashausser, E. Cisbani, A. Leone, R. D. Ransomez, Gordon D. Cates, Sonja Dieterich, H. Voskanyan, C. Jutier, R. L.J. van der Meer, Olivier Gayou, James A. Miller, L. Van Hoorebeke, Sebastien Incerti, J. Jardillier, L. Cardman, James J. Kelly, F. Xiong, S. Jaminion, I. K. Kominis, K. McCormick, P. Vernin, P. M. Rutt, A. Petrosyan, David L. Prout, Nilanga Liyanage, L. Lagamba, X. Zheng, S. L. Spiegel, Branislav Vlahovic, Leonid Levchuk, Mauro Iodice, Larry Weinstein, F. Marie, D. G. Ireland, N. S. Chant, David Manley, V. A. Punjabi, C. E. Jones, J. Gomez, Wolfgang Korsch, W. Xu, J. W. Watson, M. Roedelbronn, F. T. Baker, Z. E. Meziani, T. Saito, S. Frullani, H. Ueno, E. J. Brash, R. Roche, E. Hovhannisyan, C. E. Hyde-Wright, N. d'Hose, L. Bimbot, G. Laveissière, R. Madey, Kazushige Maeda, A. Gavalya, W. Miller, D. Neyret, T. P. Smith, B. Diederich, E. Burtin, M. Holtrop, L. Todor, G. Dezern, Z. L. Zhou, K. Livingston, D. S. Dale, V. Zeps, S. Mayilyan, E. Folts, B. D. Milbrath, Haiyan Gao, J. M. Finn, O. Rondon-Aramayo, R. A. Lindgren, V. Gorbenko, A. V. Glamazdin, Z. Chai, E. A.J.M. Offermann, S. Malov, J. Alcorn, S. Strauch, A. Shahinyan, G. Rosner, H. Fonvieille, P. G. Roos, E. W. Hughes, K. Joo, D. S. Brown, P. Brindza, G. G. Petratos, S. van Verst, M. Khayat, S. Colilli, Douglas Higinbotham, M. K. Jones, D. J. Margaziotis, M. Kuss, Seonho Choi, Ronald Gilman, Thomas Jefferson National Accelerator Facility (Jefferson Lab), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), HALL A, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, 010308 nuclear & particles physics, Cryogenics, Scintillator, 7. Clean energy, 01 natural sciences, Particle identification, Magnetic field, Nuclear physics, Cardinal point, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment, 010306 general physics, Nucleon, Instrumentation, Cherenkov radiation
Abstract

The instrumentation in Hall A at the Thomas Jefferson National Accelerator Facility was designed to study electro-and photo-induced reactions at very high luminosity and good momentum and angular resolution for at least one of the reaction products. The central components of Hall A are two identical high resolution spectrometers, which allow the vertical drift chambers in the focal plane to provide a momentum resolution of better than 2 x 10(-4). A variety of Cherenkov counters, scintillators and lead-glass calorimeters provide excellent particle identification. The facility has been operated successfully at a luminosity well in excess of 10(38) CM-2 s(-1). The research program is aimed at a variety of subjects, including nucleon structure functions, nucleon form factors and properties of the nuclear medium. (C) 2003 Elsevier B.V. All rights reserved.

Published
2004

43. Measurement of the generalized polarizabilities of the proton in virtual Compton scattering at Q2=0.92 and 1.76 GeV2

Author

G, Laveissière, L, Todor, N, Degrande, S, Jaminion, C, Jutier, R, Di Salvo, L, Van Hoorebeke, L C, Alexa, B D, Anderson, K A, Aniol, K, Arundell, G, Audit, L, Auerbach, F T, Baker, M, Baylac, J, Berthot, P Y, Bertin, W, Bertozzi, L, Bimbot, W U, Boeglin, E J, Brash, V, Breton, H, Breuer, E, Burtin, J R, Calarco, L S, Cardman, C, Cavata, C-C, Chang, J-P, Chen, E, Chudakov, E, Cisbani, D S, Dale, C W, de Jager, R, De Leo, A, Deur, N, d'Hose, G E, Dodge, J J, Domingo, L, Elouadrhiri, M B, Epstein, L A, Ewell, J M, Finn, K G, Fissum, H, Fonvieille, G, Fournier, B, Frois, S, Frullani, C, Furget, H, Gao, J, Gao, F, Garibaldi, A, Gasparian, S, Gilad, R, Gilman, A, Glamazdin, C, Glashausser, J, Gomez, V, Gorbenko, P, Grenier, P A M, Guichon, J O, Hansen, R, Holmes, M, Holtrop, C, Howell, G M, Huber, C E, Hyde-Wright, S, Incerti, M, Iodice, J, Jardillier, M K, Jones, W, Kahl, S, Kato, A T, Katramatou, J J, Kelly, S, Kerhoas, A, Ketikyan, M, Khayat, K, Kino, S, Kox, L H, Kramer, K S, Kumar, G, Kumbartzki, M, Kuss, A, Leone, J J, LeRose, M, Liang, R A, Lindgren, N, Liyanage, G J, Lolos, R W, Lourie, R, Madey, K, Maeda, S, Malov, D M, Manley, C, Marchand, D, Marchand, D J, Margaziotis, P, Markowitz, J, Marroncle, J, Martino, K, McCormick, J, McIntyre, S, Mehrabyan, F, Merchez, Z E, Meziani, R, Michaels, G W, Miller, J Y, Mougey, S K, Nanda, D, Neyret, E A J M, Offermann, Z, Papandreou, B, Pasquini, C F, Perdrisat, R, Perrino, G G, Petratos, S, Platchkov, R, Pomatsalyuk, D L, Prout, V A, Punjabi, T, Pussieux, G, Quémenér, R D, Ransome, O, Ravel, J S, Real, F, Renard, Y, Roblin, D, Rowntree, G, Rutledge, P M, Rutt, A, Saha, T, Saito, A J, Sarty, A, Serdarevic, T, Smith, G, Smirnov, K, Soldi, P, Sorokin, P A, Souder, R, Suleiman, J A, Templon, T, Terasawa, R, Tieulent, E, Tomasi-Gustaffson, H, Tsubota, H, Ueno, P E, Ulmer, G M, Urciuoli, M, Vanderhaeghen, R, Van De Vyver, R L J, Van der Meer, P, Vernin, B, Vlahovic, H, Voskanyan, E, Voutier, J W, Watson, L B, Weinstein, K, Wijesooriya, R, Wilson, B B, Wojtsekhowski, D G, Zainea, W-M, Zhang, J, Zhao, and Z-L, Zhou

Abstract

We report a virtual Compton scattering study of the proton at low c.m. energies. We have determined the structure functions P(LL)-P(TT)/epsilon and P(LT), and the electric and magnetic generalized polarizabilities (GPs) alpha(E)(Q2) and beta(M)(Q2) at momentum transfer Q(2)=0.92 and 1.76 GeV2. The electric GP shows a strong falloff with Q2, and its global behavior does not follow a simple dipole form. The magnetic GP shows a rise and then a falloff; this can be interpreted as the dominance of a long-distance diamagnetic pion cloud at low Q2, compensated at higher Q2 by a paramagnetic contribution from piN intermediate states.

Published
2003

44. Deep inelastic scattering fromA=3nuclei and the neutron structure function

Author

I. R. Afnan, Simonetta Liuti, F. Bissey, Anthony W. Thomas, G. G. Petratos, A. T. Katramatou, Wally Melnitchouk, and J. Gomez

Subjects
Physics, Nuclear and High Energy Physics, Nuclear Theory, Proton, 010308 nuclear & particles physics, Dynamic structure factor, EMC effect, FOS: Physical sciences, Inelastic scattering, Neutron scattering, Deep inelastic scattering, 01 natural sciences, Inelastic neutron scattering, Nuclear Theory (nucl-th), High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

We present a comprehensive analysis of deep inelastic scattering from He-3 and H-3, focusing in particular on the extraction of the free neutron structure function, F_2^n. Nuclear corrections are shown to cancel to within 1-2% for the isospin-weighted ratio of He-3 to H-3 structure functions, which leads to more than an order of magnitude improvement in the current uncertainty on the neutron to proton ratio F_2^n/F_2^p at large x. Theoretical uncertainties originating from the nuclear wave function, including possible non-nucleonic components, are evaluated. Measurement of the He-3 and H-3 structure functions will, in addition, determine the magnitude of the EMC effect in all A < 4 nuclei., 40 pages, 12 figures, to appear in Phys. Rev. C

Published
2003

45. Plane-wave impulse approximation extraction of the neutron magnetic form factor from quasielastic3He→(e→,e′)atQ2=0.3to0.6(GeV/c)2

Author

G. G. Petratos, Z. E. Meziani, J. M. Finn, A. Saha, W. Xu, J. P. Chen, D. Pripstein, J. S. Jensen, C. E. Jones, K. McCormick, Dipangkar Dutta, C. R. Howell, P. Żołnierczuk, S. Churchwell, A. Kievsky, R. I. Pomatsalyuk, J. R. Calarco, Ronald Ransome, G. S. Corrado, T. Black, Sebastien Incerti, K. Kramer, E. Chudakov, Emanuele Pace, R. Holmes, John C. Mitchell, T.W. Donnelly, D. S. Dale, M. K. Jones, Gordon D. Cates, K. McIlhany, E. Lakuriqi, T. Averett, M. Liang, J. O. Hansen, G. J. Kumbartzki, B. D. Anderson, Jacek Golak, Bogdan Wojtsekhowski, W. Glöckle, F. W. Hersman, S. Strauch, P. Djawotho, E. W. Hughes, D. W. Higinbotham, B. Humensky, Haiyan Gao, D. J. Margaziotis, C. F. Williamson, L. Auberbach, C. Glashausser, Karl Slifer, M. Sutter, J. Yeh, M. Viviani, Wolfgang Korsch, S. K. Nanda, M. Kuss, I. K. Kominis, C. W. de Jager, B. Tipton, William Bertozzi, F. Xiong, C. Crawford, J. W. Watson, Nilanga Liyanage, A. Deur, Hiroyuki Kamada, R. D. McKeown, R. Michaels, G. Salme, Y. Roblin, Branislav Vlahovic, Seonho Choi, L. S. Cardman, R. Suleiman, R. Kahl, L. Todor, S. Malov, J. Gomez, M. Schnee, J. W. Martin, Henryk Witała, Ronald Gilman, Paul Souder, T. Pavlin, G. W. Miller, David L. Prout, X. Jiang, M. Rvachev, T. Shin, A. V. Glamazdin, Z. Chai, J. J. LeRose, and V. Gorbenko

Subjects
Physics, Nuclear physics, Nuclear reaction, Nuclear and High Energy Physics, Quasielastic scattering, Scattering, Magnetic form factor, Hadron, Momentum transfer, Neutron, Nuclear Experiment, Nucleon
Abstract

A high precision measurement of the transverse spin-dependent asymmetry A_T' in ^3He(e,e') quasielastic scattering was performed in Hall A at Jefferson Lab at values of the squared four-momentum transfer, Q^2, between 0.1 and 0.6 (GeV/c)^2. A_(T') is sensitive to the neutron magnetic form factor, G_M^n . Values of G_M^n at Q^2 = 0.1 and 0.2 (GeV/c)^2, extracted using Faddeev calculations, were reported previously. Here, we report the extraction of G_M^n for the remaining Q^2 values in the range from 0.3 to 0.6 (GeV/c)^2 using a plane-wave impulse approximation calculation. The results are in good agreement with recent precision data from experiments using a deuterium target.

Published
2003

46. Q2Evolution of the Generalized Gerasimov-Drell-Hearn Integral for the Neutron using aH3eTarget

Author

Bogdan Wojtsekhowski, J. J. LeRose, V. Gorbenko, A. Saha, X. Jiang, E. Cisbani, Ronald Ransome, D. Rowntree, P. Djawotho, J. P. Chen, C. Glashausser, Gordon D. Cates, Karl Slifer, E. Lakuriqi, T. Averett, Paul Souder, G. M. Urciuoli, J. Berthot, E. J. Brash, Hiroshi Ueno, A. Ketikyan, S. Teijiro, T. Pavlin, F. Sabatié, Kevin Fissum, Jiansong Gao, K. S. Kumar, M. Amarian, F. Xiong, Nilanga Liyanage, G. Jones, C. E. Jones, M. Liang, R. DiSalvo, R. Suleiman, P. A. Zolnierczuk, A. V. Glamazdin, Z. Chai, Haiyan Gao, D. Pripstein, E. Chudakov, C. Jutier, R. Michaels, M. K. Jones, J. O. Hansen, S. Malov, P.Y. Bertin, M. Finn, S. Frullani, E. Burtin, J. Gomez, J. R. Calarco, David L. Prout, R. L.J. van der Meer, S. Jensen, Z. Papandreou, D. S. Brown, G. J. Lolos, M. Kuss, Mauro Iodice, M. Rvachev, K. Takahashi, William Bertozzi, A. Gasparian, H. Voskanian, G. M. Huber, F. Garibaldi, Sebastien Incerti, E. Goldberg, I. K. Kominis, Seonho Choi, S. Strauch, Shalev Gilad, L. B. Auerbach, C. W. de Jager, P. Vernin, Ronald Gilman, K. McCormick, Hiroaki Tsubota, H. Fonvieille, E. W. Hughes, Wolfgang Korsch, T. B. Humensky, W. Xu, Baile Zhang, A. Deur, R. D. McKeown, L. Todor, G. G. Petratos, Z. E. Meziani, T. Saito, Sonja Dieterich, K. Kramer, Y. Roblin, F. W. Hersman, J. Marroncle, John C. Mitchell, G. J. Kumbartzki, G. Laveissière, T. Black, R. Holmes, and J. C. Yang

Subjects
Physics, Range (particle radiation), Cross section.transverse, Particle physics, 010308 nuclear & particles physics, Scattering, Nuclear Theory, General Physics and Astronomy, Virtual particle, Electron, 01 natural sciences, Resonance (particle physics), Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Neutron, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

We present data on the inclusive scattering of polarized electrons from a polarized ^3He target at energies from 0.862 to 5.06 GeV, obtained at a scattering angle of 15.5°. Our data include measurements from the quasielastic peak, through the nucleon resonance region, and beyond, and were used to determine the virtual photon cross-section difference σ_(1/2)-σ_(3/2). We extract the extended Gerasimov-Drell-Hearn integral for the neutron in the range of four-momentum transfer squared Q^2 of 0.1–0.9 GeV^2.

Published
2002

47. Polarization transfer in the16O(e→,e′p→)15Nreaction

Author

Nilanga Liyanage, Pierre Bertin, Richard Wilson, Branislav Vlahovic, Ronald Ransome, R. Suleiman, E. Cisbani, W. U. Boeglin, J. Gomez, Laird Kramer, E. J. Brash, K. Wijesooriya, D. M. Manley, O. Ravel, J. A. Templon, P. Djawotho, J. Marroncle, J. Domingo, A. Gasparian, A. V. Glamazdin, Gordon D. Cates, K. A. Griffioen, C. Cavata, J. Berthot, B. Frois, A. Soldi, A. J. Sarty, R. I. Pomatsalyuk, Y. Roblin, G. Kumbartzki, R. Roche, T. P. Smith, S. Nanda, C. F. Perdrisat, D. J. Margaziotis, J. Fleniken, T. Terasawa, Vincent Breton, Z. L. Zhou, R. A. Lindgren, J. J. LeRose, Shalev Gilad, C. W. de Jager, Charles Glashausser, V. Gorbenko, K. A. Aniol, M. K. Jones, D. S. Dale, E. A.J.M. Offermann, K. Kino, F. Garibaldi, D. G. Zainea, C. C. Chang, J. S. McCarthy, K. S. Kumar, V. Zeps, A. Serdarevic-Offermann, S. van Verst, Pavel Sorokin, R. W. Lourie, A. Deur, Jian-Ping Chen, Ch. Hyde-Wright, M. Khayat, M. Khandaker, W. Kahl, G. M. Urciuoli, N. d'Hose, Z. Papandreou, Bogdan Wojtsekhowski, G. G. Petratos, Z. E. Meziani, H. Breuer, R. Holmes, B. D. Anderson, G. J. Lolos, M. B. Epstein, Hiroaki Tsubota, F. W. Hersman, R. L.J. van der Meer, L. A. Ewell, Ronald Gilman, K. McCormick, Wolfgang Korsch, L. Cardman, S. Jaminion, Leonid Levchuk, V. A. Punjabi, James J. Kelly, K. Joo, C. R. Howell, P. E. Ulmer, J. W. Watson, S. Kerhoas, J. R. Calarco, S. Frullani, F. T. Baker, P. Vernin, D. Neyret, B. Diederich, T. Saito, G. Rutledge, Mauro Iodice, J. Hines, Larry Weinstein, William Bertozzi, H. Fonvieille, L. Todor, A. Leone, Pete Markowitz, G. Laveissière, R. Madey, Roberto Perrino, R. De Leo, T. P. Gorringe, Paul Souder, Jing Zhao, A. Saha, R. Michaels, G. M. Huber, Justin I. McIntyre, L. Auerbach, M. Liang, G. Quéméner, D. Rowntree, J. Gao, Kevin Fissum, S. Platchkov, J. Martino, J. E. Ducret, T. Pussieux, L. Bimbot, Kazushige Maeda, Seigo Kato, J. M. Finn, J. Mougey, H. Voskanyan, C. Jutier, S. Malov, E. Burtin, M. Holtrop, B. Doyle, P. M. Rutt, David L. Prout, and H. Ueno

Subjects
Physics, Nuclear and High Energy Physics, Mathematics::Probability, Deuterium, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Polarization (waves), 7. Clean energy, 01 natural sciences
Abstract

The first $(\stackrel{\ensuremath{\rightarrow}}{e}{,e}^{\ensuremath{'}}\stackrel{\ensuremath{\rightarrow}}{p})$ polarization transfer measurements on a nucleus heavier than deuterium have been carried out at Jefferson Laboratory. Transverse and longitudinal components of the polarization of protons ejected in the reaction ${}^{16}\mathrm{O}(\stackrel{\ensuremath{\rightarrow}}{e}{,e}^{\ensuremath{'}}\stackrel{\ensuremath{\rightarrow}}{p})$ were measured in quasielastic perpendicular kinematics at a ${Q}^{2}$ of 0.8 $(\mathrm{GeV}{/c)}^{2}.$ The data are in good agreement with state of the art calculations.

Published
2000

48. Dynamics of the 16O(e, e'p) reaction at high missing energies

Author

N, Liyanage, B D, Anderson, K A, Aniol, L, Auerbach, F T, Baker, J, Berthot, W, Bertozzi, P Y, Bertin, L, Bimbot, W U, Boeglin, E J, Brash, V, Breton, H, Breuer, E, Burtin, J R, Calarco, L, Cardman, G D, Cates, C, Cavata, C C, Chang, J P, Chen, E, Cisbani, D S, Dale, R, De Leo, A, Deur, B, Diederich, P, Djawotho, J, Domingo, B, Doyle, J E, Ducret, M B, Epstein, L A, Ewell, J M, Finn, K G, Fissum, H, Fonvieille, B, Frois, S, Frullani, J, Gao, F, Garibaldi, A, Gasparian, S, Gilad, R, Gilman, A, Glamazdin, C, Glashausser, J, Gomez, V, Gorbenko, T, Gorringe, F W, Hersman, R, Holmes, M, Holtrop, N, d'Hose, C, Howell, G M, Huber, C E, Hyde-Wright, M, Iodice, C W, de Jager, S, Jaminion, M K, Jones, K, Joo, C, Jutier, W, Kahl, S, Kato, J J, Kelly, S, Kerhoas, M, Khandaker, M, Khayat, K, Kino, W, Korsch, L, Kramer, K S, Kumar, G, Kumbartzki, G, Laveissière, A, Leone, J J, LeRose, L, Levchuk, M, Liang, R A, Lindgren, G J, Lolos, R W, Lourie, R, Madey, K, Maeda, S, Malov, D M, Manley, D J, Margaziotis, P, Markowitz, J, Martino, J S, McCarthy, K, McCormick, J, McIntyre, R L, van der Meer, Z E, Meziani, R, Michaels, J, Mougey, S, Nanda, D, Neyret, E A, Offermann, Z, Papandreou, C F, Perdrisat, R, Perrino, G G, Petratos, S, Platchkov, R, Pomatsalyuk, D L, Prout, V A, Punjabi, T, Pussieux, G, Quéméner, R D, Ransome, O, Ravel, Y, Roblin, R, Roche, D, Rowntree, G A, Rutledge, P M, Rutt, A, Saha, T, Saito, A J, Sarty, A, Serdarevic-Offermann, T P, Smith, A, Soldi, P, Sorokin, P, Souder, R, Suleiman, J A, Templon, T, Terasawa, L, Todor, H, Tsubota, H, Ueno, P E, Ulmer, G M, Urciuoli, P, Vernin, S, van Verst, B, Vlahovic, H, Voskanyan, J W, Watson, L B, Weinstein, K, Wijesooriya, R, Wilson, B, Wojtsekhowski, D G, Zainea, V, Zeps, J, Zhao, and Z L, Zhou

Abstract

We measured the cross section and response functions for the quasielastic 16O(e,e'p) reaction for missing energies 25or =E(m)or =120 MeV at missing momenta P(m)or =340 MeV/c. For 25E(m)50 MeV and P(m) approximately 60 MeV/c, the reaction is dominated by a single 1s(1/2) proton knockout. At larger P(m), the single-particle aspects are increasingly masked by more complicated processes. Calculations which include pion exchange currents, isobar currents, and short-range correlations account for the shape and the transversity, but for only half of the magnitude of the measured cross section.

Published
2000

49. Measurements of the proton and deuteron spin structure functionsg1andg2

Author

Timothy Chupp, R. Gearhart, S.St. Lorant, Koji Abe, D. Kawall, P. Raines, C. Y. Prescott, H. Fonvieille, F. S. Dietrich, L. S. Rochester, J. P. Chen, D. Crabb, M. Kuriki, Ch. Hyde-Wright, T. Averett, A. Rijllart, J. Clendenin, J. Morgenstern, Donal Day, L. C. Smith, R. C. Minehart, R. Erbacher, Z. E. Meziani, F. Staley, G. Court, B. Zihlmann, R. Prepost, Emil Frlez, J. R. Johnson, P. Grenier, Timothy B. Smith, Y. Roblin, R. Antonov, R. M. Lombard-Nelsen, C. C. Young, Avraham Klein, R. Pitthan, T. J. Liu, Dinko Pocanic, J. S. McCarthy, R. A. Lindgren, F. Suekane, G. G. Petratos, Ingo Sick, J. Fellbaum, J. Button-Shafer, H. Borel, K. A. Griffioen, S. E. Kuhn, K. Witte, John C. Mitchell, A. Feltham, E. W. Hughes, D. Walz, F.R. Wesselmann, P. E. Bosted, Z. M. Szalata, D. Garvey, J. M. Bauer, Y. Terrien, T. L. Usher, B. Raue, S. Hoibraten, Pascal Steiner, D. Zimmermann, Vincent Breton, H. R. Band, O. Rondon, H. Tang, K. P. Coulter, S. E. Rock, J. Gomez, R. G. Arnold, L. M. Stuart, T. Maruyama, D. Reyna, J. A. Dunne, X.K. Maruyama, C. Comptour, M. Daoudi, T. Akagi, M. Spengos, H. Yuta, P.L. Anthony, W. Meyer, G. H. Zapalac, H. Dutz, J. Marroncle, B. Youngman, and James L. White

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Proton, Deuterium, Full data, Zero (complex analysis), Resonance, Spin structure, Beam energy
Abstract

Measurements are reported of the proton and deuteron spin structure functions ${g}_{1}^{p}$ and ${g}_{1}^{d}$ at beam energies of 29.1, 16.2, and 9.7 GeV, and ${g}_{2}^{p}$ and ${g}_{2}^{d}$ at a beam energy of 29.1 GeV. The integrals ${\ensuremath{\Gamma}}_{p}={\ensuremath{\int}}_{0}^{1}{g}_{1}^{p}{(x,Q}^{2})dx$ and ${\ensuremath{\Gamma}}_{d}={\ensuremath{\int}}_{0}^{1}{g}_{1}^{d}{(x,Q}^{2})dx$ were evaluated at fixed ${Q}^{2}=3(\mathrm{GeV}{/c)}^{2}$ using the full data set to yield ${\ensuremath{\Gamma}}_{p}=0.132\ifmmode\pm\else\textpm\fi{}0.003(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.009(\mathrm{syst})$ and ${\ensuremath{\Gamma}}_{d}=0.047\ifmmode\pm\else\textpm\fi{}0.003\ifmmode\pm\else\textpm\fi{}0.006.$ The ${Q}^{2}$ dependence of the ratio ${g}_{1}{/F}_{1}$ was studied and found to be small for ${Q}^{2}g1(\mathrm{GeV}{/c)}^{2}.$ Within experimental precision the ${g}_{2}$ data are well described by the twist-2 contribution, ${g}_{2}^{\mathrm{WW}}.$ Twist-3 matrix elements were extracted and compared to theoretical predictions. The asymmetry ${A}_{2}$ was measured and found to be significantly smaller than the positivity limit $\sqrt{R}$ for both proton and deuteron targets. ${A}_{2}^{p}$ is found to be positive and inconsistent with zero. Measurements of ${g}_{1}$ in the resonance region show strong variations with $x$ and ${Q}^{2},$ consistent with resonant amplitudes extracted from unpolarized data. These data allow us to study the ${Q}^{2}$ dependence of the integrals ${\ensuremath{\Gamma}}_{p}$ and ${\ensuremath{\Gamma}}_{n}$ below the scaling region.

Published
1998

50. Measurements of theΔ(1232)transition form factor and the ratioσn/σpfrom inelastic electron-proton and electron-deuteron scattering

Author

P. E. Bosted, Sayed Rokni, R. A. Gearhart, M. Spengos, G. A. Peterson, K. Swartz, K. A. Griffioen, A. Lung, J. Lichtenstadt, S. E. Rock, S. E. Kuhn, L. Andivahis, R. G. Arnold, L. H. Tao, J. Gomez, W. R. Dodge, J. Alster, C. E. Hyde-Wright, L. M. Stuart, F. S. Dietrich, G. G. Petratos, Sakumoto Wk, R. S. Hicks, Z. M. Szalata, C. C. Chang, C. E. Keppel, and R. A. Miskimen

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Proton, Deuterium, Scattering, Form factor (quantum field theory), Resonance, Perturbative QCD, Production (computer science), Atomic physics, Deep inelastic scattering
Abstract

Measurements of inclusive electron-scattering cross sections using hydrogen and deuterium targets in the region of the $\ensuremath{\Delta}(1232)$ resonance are reported. A global fit to these new data and previous data in the resonance region is also reported for the proton. Transition form factors have been extracted from the proton cross sections for this experiment over the four-momentum transfer squared range $1.64l{Q}^{2}l6.75 (\mathrm{GeV}{/c)}^{2}$ and from previous data over the range $2.41l{Q}^{2}l9.82 (\mathrm{GeV}{/c)}^{2}.$ The results confirm previous reports that the $\ensuremath{\Delta}(1232)$ transition form factor decreases more rapidly with ${Q}^{2}$ than expected from perturbative QCD. The ratio of ${\ensuremath{\sigma}}_{n}/{\ensuremath{\sigma}}_{p}$ in the $\ensuremath{\Delta}(1232)$ resonance region has been extracted from the deuteron data for this experiment in the range $1.64l{Q}^{2}l3.75 (\mathrm{G}\mathrm{e}\mathrm{V}/{c)}^{2}$ and for a previous experiment in the range $2.4l{Q}^{2}l7.9 (\mathrm{GeV}{/c)}^{2}.$ A study has been made of the model dependence of these results. This ratio ${\ensuremath{\sigma}}_{n}/{\ensuremath{\sigma}}_{p}$ for $\ensuremath{\Delta}(1232)$ production is slightly less than unity, while ${\ensuremath{\sigma}}_{n}/{\ensuremath{\sigma}}_{p}$ for the nonresonant cross sections is approximately 0.5, which is consistent with deep inelastic scattering results.

Published
1998

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