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9 results on '"C, Perdrisat"'

1. Proton spin structure and generalized polarizabilities in the strong quantum chromodynamics regime

Author

D. Ruth, R. Zielinski, C. Gu, M. Allada, T. Badman, M. Huang, J. Liu, P. Zhu, K. Allada, J. Zhang, A. Camsonne, J.-P. Chen, K. Slifer, K. Aniol, J. Annand, J. Arrington, T. Averett, H. Baghdasaryan, V. Bellini, W. Boeglin, J. Brock, C. Carlin, C. Chen, E. Cisbani, D. Crabb, A. Daniel, D. Day, R. Duve, L. El Fassi, M. Friedman, E. Fuchey, H. Gao, R. Gilman, S. Glamazdin, P. Gueye, M. Hafez, Y. Han, O. Hansen, M. Hashemi Shabestari, O. Hen, D. Higinbotham, T. Horn, S. Iqbal, E. Jensen, H. Kang, C. D. Keith, A. Kelleher, D. Keller, H. Khanal, I. Korover, G. Kumbartzki, W. Li, J. Lichtenstadt, R. Lindgren, E. Long, S. Malace, P. Markowitz, J. Maxwell, D. M. Meekins, Z. E. Meziani, C. McLean, R. Michaels, M. Mihovilovič, N. Muangma, C. Munoz Camacho, J. Musson, K. Myers, Y. Oh, M. Pannunzio Carmignotto, C. Perdrisat, S. Phillips, E. Piasetzky, J. Pierce, V. Punjabi, Y. Qiang, P. E. Reimer, Y. Roblin, G. Ron, O. Rondon, G. Russo, K. Saenboonruang, B. Sawatzky, A. Shahinyan, R. Shneor, S. Širca, J. Sjoegren, P. Solvignon-Slifer, N. Sparveris, V. Sulkosky, F. Wesselmann, W. Yan, H. Yang, H. Yao, Z. Ye, M. Yurov, Y. Zhang, Y. X. Zhao, and X. Zheng

Subjects
General Physics and Astronomy
Published
2022
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2. Measurement of the EMC effect in light and heavy nuclei

Author

J. Arrington, J. Bane, A. Daniel, N. Fomin, D. Gaskell, J. Seely, R. Asaturyan, F. Benmokhtar, W. Boeglin, P. Bosted, M. H. S. Bukhari, M. E. Christy, S. Connell, M. M. Dalton, D. Day, J. Dunne, D. Dutta, L. El Fassi, R. Ent, H. Fenker, H. Gao, R. J. Holt, T. Horn, E. Hungerford, M. K. Jones, J. Jourdan, N. Kalantarians, C. E. Keppel, D. Kiselev, A. F. Lung, S. Malace, D. G. Meekins, T. Mertens, H. Mkrtchyan, G. Niculescu, I. Niculescu, D. H. Potterveld, C. Perdrisat, V. Punjabi, X. Qian, P. E. Reimer, J. Roche, V. M. Rodriguez, O. Rondon, E. Schulte, K. Slifer, G. R. Smith, P. Solvignon, V. Tadevosyan, L. Tang, G. Testa, R. Trojer, V. Tvaskis, F. R. Wesselmann, S. A. Wood, L. Yuan, and X. Zheng

Subjects
Nuclear Theory (nucl-th), Particle and Plasma Physics, Nuclear Theory, Molecular, FOS: Physical sciences, Nuclear, Nuclear Experiment (nucl-ex), Atomic, Nuclear & Particles Physics, Nuclear Experiment
Abstract

Inclusive electron scattering from nuclear targets has been measured to extract the nuclear dependence of the inelastic cross section in Hall C at the Thomas Jefferson National Accelerator facility. Results are presented for 2H, 3He, 4He, 9B, 12C, 63Cu and 197Au at an incident electron beam energy of 5.77 GeV for a range of momentum transfer from Q^2 = 2 to 7 (GeV/c)^2. These data improve the precision of the existing measurements of the EMC effect in the nuclear targets at large x, and allow for more detailed examinations of the A dependence of the EMC effect., Comment: 28 pages, 23 figures, archival paper for Jefferson Lab experiment E03-103

Published
2021
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3. A small proton charge radius from an electron-proton scattering experiment

Author

W, Xiong, A, Gasparian, H, Gao, D, Dutta, M, Khandaker, N, Liyanage, E, Pasyuk, C, Peng, X, Bai, L, Ye, K, Gnanvo, C, Gu, M, Levillain, X, Yan, D W, Higinbotham, M, Meziane, Z, Ye, K, Adhikari, B, Aljawrneh, H, Bhatt, D, Bhetuwal, J, Brock, V, Burkert, C, Carlin, A, Deur, D, Di, J, Dunne, P, Ekanayaka, L, El-Fassi, B, Emmich, L, Gan, O, Glamazdin, M L, Kabir, A, Karki, C, Keith, S, Kowalski, V, Lagerquist, I, Larin, T, Liu, A, Liyanage, J, Maxwell, D, Meekins, S J, Nazeer, V, Nelyubin, H, Nguyen, R, Pedroni, C, Perdrisat, J, Pierce, V, Punjabi, M, Shabestari, A, Shahinyan, R, Silwal, S, Stepanyan, A, Subedi, V V, Tarasov, N, Ton, Y, Zhang, and Z W, Zhao

Abstract

Elastic electron-proton scattering (e-p) and the spectroscopy of hydrogen atoms are the two methods traditionally used to determine the proton charge radius, r

Published
2019

4. Neutron electric form factor up to Q2 = 1.47 GeV/c2

Author

L. Yuan, Chenyu Yan, Rolf Ent, W. Kim, W.-M. Zhang, B.D. Anderson, Brad Plaster, G. R. Smith, Donal Day, C. Perdrisat, M. Farkhondeh, P.E. Ulmer, S. Churchwell, W. Tireman, A. Yu. Semenov, M. Khandaker, R. D. Carlini, David Manley, V. Tadevosyan, C. E. Keppel, L. Cole, S. Tajima, J. Reinhold, S. Danagoulian, James J. Kelly, A. Aghalaryan, F. R. Wesselmann, V. Punjabi, Richard Madey, C. R. Howell, Brian Raue, W. Vulcan, I. A. Semenova, Y. Sato, O. K. Baker, H. Breuer, Paul Gueye, J.W. Watson, E. Christy, L. G. Tang, S. Wells, J.M. Finn, Sung-Chul Yang, Xiaofeng Zhu, Hongbo Zhu, K. Garrow, G. MacLachlan, J. Roche, R. Asaturyan, L. Gan, John C. Mitchell, Pete Markowitz, M. K. Jones, S. Kowalski, D. Mack, A. Ahmidouch, M. Elaasar, N. Simicevic, B. Hu, S. A. Wood, A.K. Opper, S. Stepanyan, H. Mkrtchyan, W. Seo, T. Reichelt, S. Taylor, H. Fenker, Hartmuth Arenhövel, A.R. Baldwin, A. Lung, Chen Yan, and E. Crouse

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Recoil, Hadron, Magnetic form factor, Electric form factor, Form factor (quantum field theory), Neutron
Abstract

The ratio of the electric to the magnetic form factor of the neutron, \(g \equiv G_{En}/G_{Mn}\), was measured via recoil polarimetry (R.G. Arnold, C.E. Carlson, F. Gross, Phys. Rev. C 23, 363 (1981)) from the quasielastic 2H\((\mathop{e}\limits^{\scriptstyle\to},e' \mathop{n}\limits^{\scriptstyle\to} )\)1H reaction at three values of Q2 (viz, 0.45, 1.15, and 1.47 (GeV/c)2) in Hall C of the Thomas Jefferson National Accelerator Facility. The data reveal that GEn continues to follow the Galster parameterization up to Q2 = 1.15 (GeV/c)2 and rises above the Galster parameterization at Q2 = 1.47 (GeV/c)2.

Published
2003
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5. Measurement of nuclear transparency for the A(e,e'pi+) reaction

Author

B, Clasie, X, Qian, J, Arrington, R, Asaturyan, F, Benmokhtar, W, Boeglin, P, Bosted, A, Bruell, M E, Christy, E, Chudakov, W, Cosyn, M M, Dalton, A, Daniel, D, Day, D, Dutta, L, El Fassi, R, Ent, H C, Fenker, J, Ferrer, N, Fomin, H, Gao, K, Garrow, D, Gaskell, C, Gray, T, Horn, G M, Huber, M K, Jones, N, Kalantarians, C E, Keppel, K, Kramer, A, Larson, Y, Li, Y, Liang, A F, Lung, S, Malace, P, Markowitz, A, Matsumura, D G, Meekins, T, Mertens, G A, Miller, T, Miyoshi, H, Mkrtchyan, R, Monson, T, Navasardyan, G, Niculescu, I, Niculescu, Y, Okayasu, A K, Opper, C, Perdrisat, V, Punjabi, A W, Rauf, V M, Rodriquez, D, Rohe, J, Ryckebusch, J, Seely, E, Segbefia, G R, Smith, M, Strikman, M, Sumihama, V, Tadevosyan, L, Tang, V, Tvaskis, A, Villano, W F, Vulcan, F R, Wesselmann, S A, Wood, L, Yuan, and X C, Zheng

Abstract

We have measured the nuclear transparency of the A(e,e'pi+) process in 2H, 12C, 27Al, 63Cu, and 197Au targets. These measurements were performed at the Jefferson Laboratory over a four momentum transfer squared range Q2=1.1 to 4.7 (GeV/c)2. The nuclear transparency was extracted as the super-ratio of (sigmaA/sigmaH) from data to a model of pion-electroproduction from nuclei without pi-N final-state interactions. The Q2 and atomic number dependence of the nuclear transparency both show deviations from traditional nuclear physics expectations and are consistent with calculations that include the quantum chromodynamical phenomenon of color transparency.

Published
2007

6. Determination of the pion charge form factor at Q2=1.60 and 2.45 (GeV/c)2

Author

T, Horn, K, Aniol, J, Arrington, B, Barrett, E J, Beise, H P, Blok, W, Boeglin, E J, Brash, H, Breuer, C C, Chang, M E, Christy, R, Ent, D, Gaskell, E, Gibson, R J, Holt, G M, Huber, S, Jin, M K, Jones, C E, Keppel, W, Kim, P M, King, V, Kovaltchouk, J, Liu, G J, Lolos, D J, Mack, D J, Margaziotis, P, Markowitz, A, Matsumura, D, Meekins, T, Miyoshi, H, Mkrtchyan, I, Niculescu, Y, Okayasu, L, Pentchev, C, Perdrisat, D, Potterveld, V, Punjabi, P, Reimer, J, Reinhold, J, Roche, P G, Roos, A, Sarty, G R, Smith, V, Tadevosyan, L G, Tang, V, Tvaskis, S, Vidakovic, J, Volmer, W, Vulcan, G, Warren, S A, Wood, C, Xu, and X, Zheng

Abstract

The 1H(e,e'pi+)n cross section was measured at four-momentum transfers of Q2=1.60 and 2.45 GeV2 at an invariant mass of the photon nucleon system of W=2.22 GeV. The charged pion form factor (F(pi)) was extracted from the data by comparing the separated longitudinal pion electroproduction cross section to a Regge model prediction in which F(pi) is a free parameter. The results indicate that the pion form factor deviates from the charge-radius constrained monopole form at these values of Q2 by one sigma, but is still far from its perturbative quantum chromodynamics prediction.

Published
2006

7. Measurements ofGEn/GMnfrom theH2(e→,e′n→)H1Reaction toQ2=1.45(GeV/c)2

Author

R. Madey, A. Yu. Semenov, S. Taylor, B. Plaster, A. Aghalaryan, E. Crouse, G. MacLachlan, S. Tajima, W. Tireman, Chenyu Yan, A. Ahmidouch, B. D. Anderson, H. Arenhövel, R. Asaturyan, O. K. Baker, A. R. Baldwin, D. Barkhuff, H. Breuer, R. Carlini, E. Christy, S. Churchwell, L. Cole, S. Danagoulian, D. Day, T. Eden, M. Elaasar, R. Ent, M. Farkhondeh, H. Fenker, J. M. Finn, L. Gan, K. Garrow, A. Gasparian, P. Gueye, C. R. Howell, B. Hu, M. K. Jones, J. J. Kelly, C. Keppel, M. Khandaker, W.-Y. Kim, S. Kowalski, A. Lai, A. Lung, D. Mack, D. M. Manley, P. Markowitz, J. Mitchell, H. Mkrtchyan, A. K. Opper, C. Perdrisat, V. Punjabi, B. Raue, T. Reichelt, J. Reinhold, J. Roche, Y. Sato, N. Savvinov, I. A. Semenova, W. Seo, N. Simicevic, G. Smith, S. Stepanyan, V. Tadevosyan, L. Tang, P. E. Ulmer, W. Vulcan, J. W. Watson, S. Wells, F. Wesselmann, S. Wood, Chen Yan, S. Yang, L. Yuan, W.-M. Zhang, H. Zhu, and X. Zhu

Subjects
Nuclear physics, Physics, Recoil, Magnetic form factor, Electric form factor, General Physics and Astronomy, Neutron, Atomic physics, Polarization (waves)
Abstract

We report new measurements of the ratio of the electric form factor to the magnetic form factor of the neutron, ${G}_{E}^{n}/{G}_{M}^{n}$, obtained via recoil polarimetry from the quasielastic $^{2}\mathrm{H}(\stackrel{\ensuremath{\rightarrow}}{e},{e}^{\ensuremath{'}}\stackrel{\ensuremath{\rightarrow}}{n})^{1}\mathrm{H}$ reaction at ${Q}^{2}$ values of 0.45, 1.13, and $1.45\text{ }(\mathrm{G}\mathrm{e}\mathrm{V}/c{)}^{2}$ with relative statistical uncertainties of $7.6%$ and $8.4%$ at the two higher ${Q}^{2}$ points, which points have never been achieved in polarization measurements.

Published
2003
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8. Measurements of GnE/GnM from the 2H(e--,en--)1H Reaction to Q2=1.45 (GeV/c)2

Author

R, Madey, A Yu, Semenov, S, Taylor, B, Plaster, A, Aghalaryan, E, Crouse, G, MacLachlan, S, Tajima, W, Tireman, Chenyu, Yan, A, Ahmidouch, B D, Anderson, H, Arenhövel, R, Asaturyan, O K, Baker, A R, Baldwin, D, Barkhuff, H, Breuer, R, Carlini, E, Christy, S, Churchwell, L, Cole, S, Danagoulian, D, Day, T, Eden, M, Elaasar, R, Ent, M, Farkhondeh, H, Fenker, J M, Finn, L, Gan, K, Garrow, A, Gasparian, P, Gueye, C R, Howell, B, Hu, M K, Jones, J J, Kelly, C, Keppel, M, Khandaker, W-Y, Kim, S, Kowalski, A, Lai, A, Lung, D, Mack, D M, Manley, P, Markowitz, J, Mitchell, H, Mkrtchyan, A K, Opper, C, Perdrisat, V, Punjabi, B, Raue, T, Reichelt, J, Reinhold, J, Roche, Y, Sato, N, Savvinov, I A, Semenova, W, Seo, N, Simicevic, G, Smith, S, Stepanyan, V, Tadevosyan, L, Tang, P E, Ulmer, W, Vulcan, J W, Watson, S, Wells, F, Wesselmann, S, Wood, Chen, Yan, S, Yang, L, Yuan, W-M, Zhang, H, Zhu, and X, Zhu

Abstract

We report new measurements of the ratio of the electric form factor to the magnetic form factor of the neutron, G(n)(E)/G(n)(M), obtained via recoil polarimetry from the quasielastic 2H(e--,e(')n--)1H reaction at Q2 values of 0.45, 1.13, and 1.45 (GeV/c)(2) with relative statistical uncertainties of 7.6% and 8.4% at the two higher Q2 points, which points have never been achieved in polarization measurements.

Published
2003

9. Pion Absorption inHe3,4andπNResonances

Author

L. Orphanos, Christopher Morris, R. C. Minehart, R. Altemus, J. Kaellne, P. A. M. Gram, P. C. Gugelot, E.A. Wadlinger, C. Perdrisat, James McCarthy, and B. Hoeistad

Subjects
Nuclear reaction, Physics, Baryon, Pion, Scattering, Hadron, General Physics and Astronomy, Resonance, Elementary particle, Atomic physics, Nucleon
Abstract

The cross sections of /sup 3,4/He(..pi../sup -/,n)/sup 2,3/H have been measured at 285, 428, 525, and 575 MeV extending the information on the energy dependence beyond the region previously known (50 --300 MeV). The cross sections beyond the region of the ..delta.. resonance are found to decrease less rapidly than that of the elementary ..pi..d..-->..pp process. This energy dependence suggests that pion absorption in a nucleus is associated with ..pi..+N (off-shell) scattering which includes I = 1/2 ..pi..N resonances that are strongly suppressed in ..pi..d..-->..pp.

Published
1981
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