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1. Electroproduction of kaons on light nuclei

Author

R. Sawafta, J. H. Liu, John C. Mitchell, T. Eden, C. Yan, D. G. Meekins, E. Christy, F. Dohrmann, P. Ambrozewicz, L. Cole, M. Sarsour, A. Ahmidouch, Y. Sato, P. E. Reimer, S. Tajima, J. A. Dunne, J. Roche, S. Danagoulian, Kevin Bailey, B. Mueller, J. W. Price, W. Hinton, N. S. Chant, H. Mkrtchyan, J. Crowder, H. Juengst, Haiyan Gao, John Arrington, G. Savage, C. Cothran, J. P. Schiffer, B. Zihlmann, M. Zeier, H. C. Fenker, J.-O. Hansen, Paul Gueye, Rolf Ent, R. D. Carlini, Brian Raue, R. Asaturyan, L. Gan, W. J. Cummings, A. Semenov, D. F. Geesaman, J. Cha, D. S. Brown, M. Elaasar, A. Cochran, H. Breuer, Dipangkar Dutta, Pete Markowitz, L. Yuan, J. Reinhold, H. Bitao, A. Uzzle, K. Gustafsson, B. Terburg, F. Duncan, S. Stepanyan, P. G. Roos, Ketevi Assamagan, Avraham Klein, G. Collins, Thomas O'Neill, D. Potterveld, V. Tadevosian, K. Garrow, H. E. Jackson, D. Koltenuk, C. S. Armstrong, Y. Liang, O. K. Baker, I. Niculescu, B. Zeidman, A. F. Lung, G. Niculescu, Toshinobu Miyoshi, H. Yamaguchi, R. Madey, D. Abbott, L. Ewell, H. T. Fortune, Y. Fujii, K. Hafidi, R. E. Segel, S. Beedoe, S. Mtingwa, C. J. Martoff, R. Mohring, C. E. Keppel, S. A. Wood, D. J. Mack, Stephen Avery, and L. G. Tang

Subjects
Physics, Nuclear and High Energy Physics, Meson, Proton, Helium-3, Hadron, Production (computer science), Elementary particle, Atomic physics, Nuclear Experiment, Lambda, Isotopes of helium
Abstract

The A(e,e{prime}K{sup +})YX reaction on H, D, {sup 3}He, and {sup 4}He was investigated in Hall C at CEBAF. Data were obtained for Q{sup 2} {approx} 0.35 and 0.5 GeV{sup 2} at 3.245 GeV. The missing mass spectra for both H and D are fitted with Monte-Carlo simulations incorporating peaks corresponding to {Lambda} production on the proton and {Sigma} production on both the proton and neutron. For D, the cross section ratio {Sigma}{sup 0}/{Sigma}{sup {minus}} {approx} 2, and excess yield close to the thresholds for {Lambda} and {Sigma} production can be attributed to final-state interactions that are compared to the data. The analysis of the data for the He targets is in a more preliminary state with broader quasi-free peaks resulting from the higher Fermi momenta. Evidence for bound {Lambda}-hypernuclear states is seen and other structure may be present.

Published
2001

2. Electroproduction of kaons and light hypernuclei

Author

John C. Mitchell, Y. Liang, T. Eden, Thomas O'Neill, D. F. Geesaman, R. E. Segel, L. Ewell, J. Cha, H. Bitao, E. Christy, Ketevi Assamagan, M. Sarsour, J. Crowder, L. Cole, J. W. Price, S. Danagoulian, Dipangkar Dutta, H. Juengst, H. Yamaguchi, H.T. Fortune, D. Koltenuk, N. Chant, J. H. Liu, D. Abbott, R. Asaturyan, D. G. Meekins, W. Hinton, T. Miyoshi, J. Roche, Brian Raue, Paul Gueye, W. U. Boeglin, J. Reinhold, Pete Markowitz, J.-O. Hansen, L. G. Tang, R. Mohring, R. Sawafta, K. Garrow, J. P. Schiffer, C. E. Keppel, C. J. Martoff, C. Cothran, John Arrington, Kevin Bailey, C. Yan, B. Zihlmann, H. C. Fenker, B. Terburg, C. S. Armstrong, P. Roos, Y. Sato, Rolf Ent, S. Tajima, B. Mueller, P. Ambrozewicz, G. Savage, S. Stepanyan, D. S. Brown, A. Uzzle, O. K. Baker, Avraham Klein, A. Cochran, H. Mkrtchyan, A. Semenov, L. Gan, W. J. Cummings, G. Collins, F. Duncan, K. Gustafsson, F. Dohrmann, Y. Fujii, R. Madey, M. Zeier, J. A. Dunne, A. Ahmidouch, R. D. Carlini, S. A. Wood, A. F. Lung, D. J. Mack, L. Yuan, S. Beedoe, M. Elaasar, Stephen Avery, G. Niculescu, I. Niculescu, D. Potterveld, V. Tadevosian, S. Mtingwa, H. Breuer, K. Hafidi, Haiyan Gao, H. E. Jackson, P. E. Reimer, B. Zeidman, and (Astro)-Particles Physics

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Deuterium, Production (computer science), Electron, Nucleon, Fundamental interaction
Abstract

A detailed investigation of the basic hyperon-nucleon interactions in nuclei is one of the aims of Experiment 91-016, approved with high priority at CEBAF, to study the electroproduction of kaons on targets of deuterium, {sup 3}He, and {sup 4}He. Inasmuch as both the electron and K{sup +} are particles that interact relatively weakly with nucleons, electroproduction of light hypernuclei provides a low-distortion method for investigating the fundamental interactions between nucleons, {Alpha}`s, and {Epsilon}`s in few-body systems. In particular, the (e,e`K{sup +}) reactions on cryogenic targets of D, {sup 3}He, and {sup 4}He will be studied at incident electron energies near 3 GeV with coincident detection of the emergent e and K{sup +} in the HMS and SOS magnetic spectrometers in Hall C. Construction of the He target, operating at {approximately}10 atm, {approximately}50 K and capable of dissipating {approximately}30 W, is expected to be complete prior to commencement of production runs in Hall C. The first data runs for E91-016, expected to begin late in FY 1995, will also be the basis for a doctoral thesis at Hampton University. In addition to providing new information on the phases of hyperon-nucleon interactions, measurements of cross sections for hypernuclear formation, and interference phenomena,more » the data may provide evidence for the presence of bound {Epsilon}`s and strange di-baryonic states that are the subject of considerable theoretical discussion.« less

Published
2001

3. Evidence for Valencelike Quark-Hadron Duality

Author

W. F. Vulcan, C. Yan, I. Niculescu, S. A. Wood, J. H. Mitchell, Paul Gueye, John Arrington, D. J. Mack, P. Stoler, J. W. Price, H. E. Jackson, Donal Day, C. E. Keppel, B. Terburg, J. Reinhold, V. Frolov, D. G. Meekins, L. G. Tang, Rolf Ent, D. Koltenuk, C. S. Armstrong, J. Cha, Dipangkar Dutta, C. Bochna, R. E. Segel, R. D. Carlini, D. van Westrum, D. Potterveld, R. Mohring, G. Niculescu, C. Cothran, W. Hinton, R. J. Holt, D. F. Geesaman, Ketevi Assamagan, O. K. Baker, M. A. Miller, J. A. Dunne, Douglas H Beck, B. Zeidman, and Haiyan Gao

Subjects
Quantum chromodynamics, Quark, Physics, Particle physics, Scattering, Nuclear Theory, Hadron, General Physics and Astronomy, Elementary particle, Resonance (particle physics), Nuclear physics, Nuclear Experiment, Nucleon, Scaling
Abstract

A newly obtained data sample of inclusive electron-nucleon scattering from both hydrogen and deuterium targets is analyzed. These JLab data span the nucleon resonance region up to four-momentum transfers of 5 (GeV/c){sup 2} . The data are found to follow an average scaling curve. The inclusion of low-momentum transfer data yields a scaling curve resembling deep inelastic neutrino-nucleus scattering data, suggesting a sensitivity to valencelike structure only. (c) 2000 The American Physical Society.

Published
2000

4. Measurements of Deuteron Photodisintegration up to 4.0 GeV

Author

D. Beatty, Pete Markowitz, L. Cardman, J. A. Dunne, D. van Westrum, J. Cha, David Mack, H. T. Fortune, K. Gustafsson, R. D. Carlini, C. Bochna, G. J. Kumbartzki, B. R. Owen, J.-O. Hansen, S. Danagoulian, Gabriel Niculescu, Dipangkar Dutta, B. Zeidman, S. Barrow, G. Collins, A. Ahmidouch, Thomas O'Neill, J. W. Price, John Arrington, G. Savage, I. Niculescu, C. Yan, R. J. Holt, H. Mkrtchyan, P. M. Rutt, P. Stoler, Haiyan Gao, D. H. Potterveld, H. E. Jackson, B. W. Filippone, O. K. Baker, Z. E. Meziani, H. Breuer, M. Khandaker, J. Napolitano, B. Terburg, C. S. Armstrong, M. A. Miller, D. Koltenuk, F. Duncan, R. Suleiman, E. J. Brash, K. McFarlane, Rolf Ent, N. Simicevic, D. Abbott, Paul Gueye, R. Madey, W. F. Vulcan, D. F. Geesaman, V. Frolov, T. A. Forest, S. F. Pate, J. E. Belz, M. Harvey, P. E. Bosted, Avraham Klein, T. Eden, J. H. Mitchell, W. J. Cummings, G. Rakness, A. F. Lung, C. Salgado, N. S. Chant, W. Hinton, M. Witkowski, Ronald Gilman, S. Beedoe, R. E. Segel, R. Mohring, S. A. Wood, C. E. Keppel, S. E. Williamson, Alan M. Nathan, E. R. Kinney, Douglas H Beck, R. D. McKeown, J. Reinhold, L. G. Tang, R. V. Cadman, Ketevi Assamagan, Ronald Ransome, D. G. Meekins, E. J. Beise, and C. Cothran

Subjects
Physics, Quantum chromodynamics, Nuclear reaction, Particle physics, Proton, Hadron, FOS: Physical sciences, General Physics and Astronomy, Particle accelerator, Photon energy, law.invention, Nuclear physics, law, Photodisintegration, Physics::Accelerator Physics, Nuclear Experiment (nucl-ex), Nuclear Experiment, Nucleon
Abstract

The first measurements of the differential cross section for the d(gamma,p)n reaction up to 4.0 GeV were performed at Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab. We report the cross sections at the proton center-of-mass angles of 36, 52, 69 and 89 degrees. These results are in reasonable agreement with previous measurements at lower energy. The 89 and 69 degree data show constituent-counting-rule behavior up to 4.0 GeV photon energy. The 36 and 52 degree data disagree with the counting rule behavior. The quantum chromodynamics (QCD) model of nuclear reactions involving reduced amplitudes disagrees with the present data., Comment: 5 pages (REVTeX), 1 figure (postscript)

Published
1998

5. Quasifree(e,e′p)Reactions and Proton Propagation in Nuclei

Author

Alan M. Nathan, E. R. Kinney, A.O. Mateos, O. K. Baker, W. J. Cummings, Wolfgang Lorenzon, J. Reinhold, S. Barrow, D. H. Potterveld, V. Frolov, A. Ahmidouch, H. Mkrtchyan, R. E. Segel, Donal Day, B. Terburg, Ketevi Assamagan, L. G. Tang, C. Yan, K. Beard, R. Mohring, D. van Westrum, E. E. W. Bruins, J.-E. Ducret, J. Cha, Dipangkar Dutta, C. E. Keppel, P. Stoler, B. Zeidman, R. Suleiman, E. Belz, V. Tadevosyan, Kevin Bailey, R. D. Carlini, J.-O. Hansen, S. Danagoulian, Gabriel Niculescu, C. S. Armstrong, D. Abbott, C. Salgado, C. E. Jones, H. T. Fortune, D. Koltenuk, John C. Mitchell, Haiyan Gao, S. A. Wood, T. Eden, J. Arrington, W. Hinton, J. C. Yang, Thomas O'Neill, Ross Milner, J. W. Martin, H. E. Jackson, L. H. Kramer, J. Yu, J. A. Dunne, D. Beatty, S. Beedoe, R. J. Holt, C. Cothran, Ronald Gilman, J. W. Price, C. R. Jackson, Pete Markowitz, I. Niculescu, B. Zihlmann, M. Khandaker, Pat Welch, M. A. Miller, F. Duncan, David Mack, J. P. Schiffer, D. G. Meekins, Rolf Ent, Paul Gueye, E. J. Beise, D. F. Geesaman, C. Bochna, D. DeSchepper, Avraham Klein, K. McFarlane, R. Madey, W. Kim, C. F. Williamson, W. Zhao, Ts A. Amatuni, H. Breuer, S. B. Kaufman, James J. Kelly, and N. S. Chant

Subjects
Nuclear physics, Physics, Missing energy, Proton, Nuclear transparency, Scattering, Attenuation, Momentum transfer, Plane wave, General Physics and Astronomy, Atomic physics, Impulse (physics), Nuclear Experiment
Abstract

The (e,e'p) reaction was studies on targets of C, Fe, and Au at momentum transfers squared Q{sup 2} of 0.6, 1.3, 1.8 and 3.3 GeV{sup 2} in a region of kinematics dominated by quasifree electron-proton scattering. Missing energy and missing momentum distributions are reasonably well described by plane wave impulse approximation calculations with Q{sup 2} and A dependent corrections that measure the attenuation of the final state protons.

Published
1998

6. Electroproduction of strangeness on [sub Λ][sup 3,4]H bound states on Helium

Author

A. Lung, L. Cole, Rolf Ent, A. Yu. Semenov, D. S. Brown, A. Cochran, H. E. Jackson, John C. Mitchell, R. Asaturyan, K. Gustafsson, Joerg Reinhold, H. C. Fenker, K. Garrow, J. Roche, T. Eden, J. Crowder, P. E. Reimer, G. Collins, Pete Markowitz, Thomas O'Neill, S. A. Wood, H. Breuer, W. Hinton, J.-O. Hansen, Brian Raue, J. A. Dunne, L. A. Ewell, F. Dohrmann, A. Uzzle, P. Ambrozewicz, C. J. Martoff, I. Niculescu, J. W. Price, D. J. Mack, H. Bitao, C. Yan, M. Sarsour, E. Christy, D. H. Potterveld, M. Elaasar, Paul Gueye, A. Ahmidouch, S. Beedoe, L. G. Tang, D. F. Geesaman, Stephen Avery, F. Duncan, H. Mkrtchyan, C. Cothran, R. Sawafta, Y. Liang, L. Yuan, S. Stepanyan, B. Zihlmann, P. G. Roos, Avraham Klein, S. Mtingwa, R. E. Segel, M. Zeier, Kevin Bailey, J. H. Liu, V. Tadevosian, J. Cha, B. Terburg, S. Tajima, R. Mohring, D. G. Meekins, R. Madey, Dipangkar Dutta, N. S. Chant, S. Danagoulian, H. Juengst, G. Savage, C. E. Keppel, G. Niculescu, Ketevi Assamagan, R. D. Carlini, B. Mueller, L. Gan, W. J. Cummings, H. Yamaguchi, J. Arrington, C. S. Armstrong, D. Abbott, D. Koltenuk, Y. Fujii, Haiyan Gao, B. Zeidman, Toshinobu Miyoshi, Yoichi Sato, H. T. Fortune, and K. Hafidi

Subjects
Physics, Particle physics, chemistry.chemical_element, Particle accelerator, Strangeness, Lambda baryon, Lambda, law.invention, Nuclear physics, Helium-4, chemistry, law, Helium-3, Bound state, Helium
Abstract

The A(e,e'K+)X reaction has been investigated at Jefferson Laboratory. Data were taken for Q2 {approx_equal} 0.35 GeV2 at a beam energy of 3.245 GeV for 1H,3He and 4He targets. Evidence for {lambda}-hypernuclear bound states is seen for 3,4He targets. This is the first time that the electroproduction of these hypernuclei has been observed.

Published
2005

7. Near threshold electroproduction of theωmeson atQ2≈0.5GeV2

Author

L. Ewell, J. Arrington, D. Abbott, S. Danagoulian, J. A. Dunne, John C. Mitchell, D. G. Meekins, Brian Raue, T. Eden, J.-O. Hansen, J. Reinhold, H. Mkrtchyan, H. T. Fortune, Dipanwita Dutta, L. G. Tang, V. Tadevosyan, Oliver Keith Baker, R. Sawafta, G. Niculescu, C. Cothran, Richard Madey, B. Zihlmann, D. H. Potterveld, Kevin Bailey, B. Zeidman, Ketevi Assamagan, R. D. Carlini, Andreas Klein, Donal Day, B. Terburg, J. W. Price, Pete Markowitz, J. Cha, C. Yan, C. S. Armstrong, W. J. Cummings, D. Koltenuk, A. Ahmidouch, K. Gustafsson, F. Duncan, G. Collins, Thomas O'Neill, I. Niculescu, Rolf Ent, G. Savage, Haiyan Gao, W. Hinton, Paul Gueye, D. F. Geesaman, S. A. Wood, S. Stepanyan, P. G. Roos, H. Breuer, D. J. Mack, C. E. Keppel, R. E. Segel, R. Mohring, S. Beedoe, S. Mtingwa, P. Ambrozewicz, and C. J. Martoff

Subjects
Physics, Nuclear and High Energy Physics, Angular range, Particle physics, Photon, Meson production, Meson, 010308 nuclear & particles physics, Parity (physics), 01 natural sciences, Omega, Nuclear physics, Near threshold, Angular distribution, 0103 physical sciences, Nuclear Experiment, 010306 general physics
Abstract

Electroproduction of the {omega} meson was investigated in the {sup 1}H(e,e{sup '}p){omega} reaction. The measurement was performed at a four-momentum transfer Q{sup 2}{approx_equal}0.5 GeV{sup 2}. Angular distributions of the virtual photon-proton center-of-momentum cross sections have been extracted over the full angular range. These distributions exhibit a strong enhancement over t-channel parity exchange processes in the backward direction. According to a newly developed electroproduction model, this enhancement provides significant evidence of resonance formation in the {gamma}*p{yields}{omega}p reaction channel.

Published
2004

8. Electroproduction of Strangeness on Light Nuclei

Author

F. DOHRMANN, D. ABBOTT, A. AHMIDOUCH, P. AMBROZEWICZ, C.S. ARMSTRONG, J. ARRINGTON, R. ASATURYAN, K. ASSAMAGAN, S. AVERY, K. BAILEY, O.K. BAKER, S. BEEDOE, H. BITAO, H. BREUER, D.S. BROWN, R. CARLINI, J. CHA, N. CHANT, E. CHRISTY, A. COCHRAN, L. COLE, G. COLLINS, C. COTHRAN, J. CROWDER, W.J. CUMMINGS, S. DANAGOULIAN, F. DUNCAN, J. DUNNE, D. DUTTA, T. EDEN, M. ELAASAR, R. ENT, L. EWELL, H. FENKER, H.T. FORTUNE, Y. FUJII, L. GAN, H. GAO, K. GARROW, D.F. GEESAMAN, P. GUEYE, K. GUSTAFSSON, K. HAFIDI, J.O. HANSEN, W. HINTON, H.E. JACKSON, H. JUENGST, C. KEPPEL, A. KLEIN, D. KOLTENUK, Y. LIANG, J.H. LIU, A. LUNG, D. MACK, R. MADEY, P. MARKOWITZ, C.J. MARTOFF, D. MEEKINS, J. MITCHELL, T. MIYOSHI, H. MKRTCHYAN, R. MOHRING, S.K. MTINGWA, B. MUELLER, T.G. O’NEILL, G. NICULESCU, I. NICULESCU, D. POTTERVELD, J.W. PRICE, B.A. RAUE, P.E. REIMER, J. REINHOLD, J. ROCHE, P. ROOS, M. SARSOUR, Y. SATO, G. SAVAGE, R. SAWAFTA, R.E. SEGEL, A.YU. SEMENOV, S. STEPANYAN, V. TADEVOSIAN, S. TAJIMA, L. TANG, B. TERBURG, A. UZZLE, S. WOOD, H. YAMAGUCHI, C. YAN, L. YUAN, M. ZEIER, B. ZEIDMAN, and B. ZIHLMANN

Subjects
Physics, Light nucleus, Electroproduction, Nuclear Theory, Strangeness, Hyperons, Spectral function, Nuclear physics, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Nuclear Experiment, Hypernuclear boundstates, Electroproduction of strangeness, Nuclear targets
Abstract

The A(e,e'K+)YX reaction has been investigated in Hall C at Jefferson Laboratory for 6 different targets. Data were taken for Q2)approx 0.35 and 0.5 GeV2) at a beam energy of 3.245GeV for 1)H, 2)H, 3)He, 4)He, C and Al targets. The missing mass spectra are fitted with Monte Carlo simulations taking into account the production of Lambda and Sigma0) hyperon production off the proton, and Sigma-) off the neutron. Models for quasifree production are compared to the data, excess yields close to threshold are attributed to FSI. Evidence for Lambda-hypernuclear bound states is seen for 3,4)He targets.

Published
2004

9. Quasielastic(e,e′p)reaction onC12,Fe56, andAu197

Author

D. Dutta, D. van Westrum, D. Abbott, A. Ahmidouch, Ts. A. Amatuoni, C. Armstrong, J. Arrington, K. A. Assamagan, K. Bailey, O. K. Baker, S. Barrow, K. Beard, D. Beatty, S. Beedoe, E. Beise, E. Belz, C. Bochna, P. E. Bosted, H. Breuer, E. E. W. Bruins, R. Carlini, J. Cha, N. Chant, C. Cothran, W. J. Cummings, S. Danagoulian, D. Day, D. DeSchepper, J.-E. Ducret, F. Duncan, J. Dunne, T. Eden, R. Ent, H. T. Fortune, V. Frolov, D. F. Geesaman, H. Gao, R. Gilman, P. Guèye, J. O. Hansen, W. Hinton, R. J. Holt, C. Jackson, H. E. Jackson, C. Jones, S. Kaufman, J. J. Kelly, C. Keppel, M. Khandaker, W. Kim, E. Kinney, A. Klein, D. Koltenuk, L. Kramer, W. Lorenzon, A. Lung, K. McFarlane, D. J. Mack, R. Madey, P. Markowitz, J. Martin, A. Mateos, D. Meekins, M. A. Miller, R. Milner, J. Mitchell, R. Mohring, H. Mkrtchyan, A. M. Nathan, G. Niculescu, I. Niculescu, T. G. O’Neill, D. Potterveld, J. W. Price, J. Reinhold, C. Salgado, J. P. Schiffer, R. E. Segel, P. Stoler, R. Suleiman, V. Tadevosyan, L. Tang, B. Terburg, T. P. Welch, C. Williamson, S. Wood, C. Yan, J.-C. Yang, J. Yu, B. Zeidman, W. Zhao, and B. Zihlmann

Subjects
Physics, Nuclear and High Energy Physics, Mathematical physics
Published
2003

10. ELECTROPRODUCTION OF STRANGENESS ON LIGHT NUCLEI

Author

R. Carlini, M. Elaasar, F. Dohrmann, I. Niculescu, H. E. Jackson, G. Savage, H. Yamaguchi, J. Roche, H. G. Juengst, S. A. Wood, S. Danagoulian, D. Abbott, Paul Gueye, T. Eden, G. Niculescu, M. Zeier, M. Sarsour, C. J. Martoff, L. Cole, Stephen Avery, R. E. Segel, J. Crowder, Y. Liang, B. Terburg, P. G. Roos, Avraham Klein, H. Mkrtchyan, Rolf Ent, Ketevi Assamagan, S. Beedoe, Cynthia Keppel, P. E. Reimer, J. W. Price, Y. Fujii, B. Zeidman, R. Mohring, O. K. Baker, D. Koltenuk, J. H. Liu, R. Asaturyan, J. H. Mitchell, H. Bitao, P. Ambrozewicz, N. Chant, A. Ahmidouch, W. Hinton, B. Zihlmann, D. G. Meekins, D. F. Geesaman, S. Mtingwa, A. Uzzle, T. Miyoshi, V. Tadevosian, K. Gustafsson, S. S. Stepanyan, David Mack, L. G. Tang, R. Sawafta, Kevin Bailey, C. S. Armstrong, Chenyu Yan, L. Yuan, D. H. Potterveld, E. Christy, C. Cothran, P. Markowitz, L. Gan, A. Yu. Semenov, W. J. Cummings, G. Collins, F. Duncan, Thomas O'Neill, Joerg Reinhold, K. Garrow, A. Lung, J. Cha, Dipangkar Dutta, R. Madey, D. S. Brown, A. Cochran, J. Arrington, J. O. Hansen, Haiyan Gao, James Dunne, H. Fenker, B. Mueller, Yoichi Sato, H. Breuer, H. T. Fortune, B. A. Raue, K. Hafidi, S. Tajima, and L. A. Ewell

Subjects
Nuclear physics, Physics, Light nucleus, Strangeness
Published
2003

11. Measurement of longitudinal and transverse cross sections in the3He(e,e′π+)3Hreaction atW=1.6 GeV

Author

J. Cha, Dipangkar Dutta, I. Niculescu, D. McKee, V. Tadevosyan, B. Mueller, Kevin Bailey, J. Arrington, B. Beise, P. Ambrozewicz, B. Zihlmann, D. Schepper, S. A. Wood, H. Breuer, J. A. Dunne, Toshiyuki Takahashi, H. Mkrtchyan, B. Terburg, R. D. Carlini, L. Gan, D. J. Mack, Paul Gueye, L. G. Tang, D. H. Potterveld, D. F. Geesaman, Ketevi Assamagan, Stephen Avery, R. Sawafta, R. E. Segel, N. S. Chant, John C. Mitchell, T. P. Welch, S. Stepanyan, P. G. Roos, D. Gaskell, V. Papavassiliou, C. Jackson, G. Hofman, B. Zeidman, Thomas O'Neill, C. E. Keppel, C. Glashausser, A. Lung, M. Harvey, J. Reinhold, Rolf Ent, D. Koltenuk, D. S. Brown, S. Beedoe, A. Gasparian, J. Volmer, A. A. Cowley, Osamu Hashimoto, H. E. Jackson, O. K. Baker, H. Anklin, A. Ahmidouch, L. Yuan, E. R. Kinney, D. van Westrum, S. Danagoulian, G. Niculescu, W. Hinton, and Ronald Gilman

Subjects
Physics, Nuclear and High Energy Physics, Meson production, Photon, Nuclear Theory, Virtual particle, Polarization (waves), Nuclear physics, Transverse plane, Pion, Pi, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, Nucleon
Abstract

The coherent 3He(e,e{pi}+)3H reaction was measured at Q2 = 0.4 (GeV/c)2 and W = 1.6 GeV for two values of the virtual photon polarization, {epsilon}, allowing the separation of longitudinal and transverse cross sections. The results from the coherent process on 3He were compared to H(e,e{pi}+)n data taken at the same kinematics. This marks the first direct comparison of these processes. At these kinematics (p{pi} = 1.1 GeV/c), pion rescattering from the spectator nucleons in the 3He(e,e{pi}+)3H process is expected to be small, simplifying the comparison to {pi}+ production from the free proton.

Published
2001

12. Longitudinal Electroproduction of Charged Pions fromH1,H2, andH3e

Author

A. Cowley, P. Ambrozewicz, Ronald Gilman, P. Roos, D. Van Westrum, R. Carlini, B. Beise, B. Zeidman, D. McKee, P. Gueye, H. Anklin, C. Jackson, D. Dutta, D. S. Brown, O. Hashimoto, J. Cha, R. Segel, M. Harvey, A. Lung, R. Ent, J. Mitchell, A. Gasparian, T. Takahashi, L. Yuan, L. Gan, T. G. O'Neill, D. Potterveld, I. Niculescu, T. P. Welch, Stephen Avery, B. Zihlmann, H. E. Jackson, J. Reinhold, D. F. Geesaman, H. Breuer, V. Papavassiliou, G. Kyle, S. Stepanyan, W. Hinton, G. Niculescu, N. Chant, J. Volmer, J. Arrington, D. Mack, K. Bailey, D. Koltenuk, V. Tadevosyan, D. De Schepper, C. Glashausser, E. Kinney, B. Mueller, O. K. Baker, B. Terburg, K. Assamagan, A. Ahmidouch, R. Sawafta, D. Gaskell, James Dunne, L. Tang, S. Danagoulian, G. Hofman, C. Keppel, H. Mkrtchyan, S. Beedoe, and S. Wood

Subjects
Physics, Particle physics, Meson, Nuclear Theory, Hadron, General Physics and Astronomy, Fermi surface, Elementary particle, Nuclear physics, Pion, Recoil, High Energy Physics::Experiment, Invariant mass, Nuclear Experiment, Boson
Abstract

Separated longitudinal and transverse cross sections for charged pion electroproduction from (1)H, (2)H, and (3)He were measured at Q(2) = 0.4 (GeV/c)(2) for two values of the invariant mass, W = 1.15 GeV and W = 1.60 GeV, in a search for a mass dependence which would signal the effect of nuclear pions. This is the first such study that includes recoil momenta significantly above the Fermi surface. The longitudinal cross section, if dominated by the pion-pole process, should be sensitive to nuclear pion currents. Comparisons of the longitudinal cross section target ratios to a quasifree calculation reveal a significant suppression in (3)He at W = 1.60 GeV. The W = 1.15 GeV results are consistent with simple estimates of the effect of nuclear pion currents, but are also consistent with pure quasifree production.

Published
2001

13. xandξscaling of the nuclear structure function at largex

Author

J. Zhao, D. Koltenuk, Ingo Sick, C. E. Keppel, W. F. Vulcan, B. Zihlmann, D. G. Crabb, A. Honegger, Curtis Smith, B. Bray, J. Jourdan, G. Niculescu, B. W. Filippone, Dipangkar Dutta, Donal Day, J. H. Mitchell, B. Terburg, C. S. Armstrong, J. Arrington, T. Averett, James McCarthy, G. Collins, J. Jensen, R. A. Lindgren, A. Lung, R. D. Carlini, O. Rondon, I. Niculescu, S. A. Wood, W.U. Boeglin, C. Cothran, D. J. Mack, T. Petitjean, R. D. McKeown, C. Yan, H. Mkrtchyan, Oliver Keith Baker, L.J. de Bever, J. A. Dunne, D. G. Meekins, C. Bochna, E. W. Hughes, and Rolf Ent

Subjects
Physics, Momentum, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Scattering, Momentum transfer, Nuclear structure, Inelastic scattering, Nuclear Experiment, Nucleon, Electron scattering, Scaling
Abstract

Inclusive electron scattering data are presented for ^2H, C, Fe, and Au targets at an incident electron energy of 4.045 GeV for a range of momentum transfers from Q^2=1 to 7 (GeV/c)^2. Data were taken at Jefferson Laboratory for low values of energy loss, corresponding to values of Bjorken x ≳ 1. The structure functions do not show scaling in x in this range, where inelastic scattering is not expected to dominate the cross section. The data do show scaling, however, in the Nachtmann variable ξ. This scaling appears to be the result of Bloom- Gilman duality in the nucleon structure function combined with the Fermi motion of the nucleons in the nucleus. The resulting extension of scaling to larger values of ξ opens up the possibility of accessing nuclear structure functions in the high-x region at lower values of Q^2 than previously believed.

Published
2001

14. Experimental Verification of Quark-Hadron Duality

Author

S. A. Wood, D. Koltenuk, C. S. Armstrong, R. J. Holt, D. van Westrum, B. W. Filippone, D. J. Mack, J. Reinhold, B. Zeidman, Paul Gueye, John Arrington, J. A. Dunne, C. E. Keppel, C. Cothran, G. Niculescu, L. G. Tang, R. E. Segel, R. D. Carlini, Douglas H Beck, Rolf Ent, W. F. Vulcan, Donal Day, R. Mohring, B. Terburg, Haiyan Gao, W. Hinton, C. Bochna, P. Stoler, D. G. Meekins, J. H. Mitchell, J. W. Price, J. Cha, Dipangkar Dutta, D. F. Geesaman, D. Potterveld, I. Niculescu, O. K. Baker, Ketevi Assamagan, H. E. Jackson, V. Frolov, M. A. Miller, and C. Yan

Subjects
Quark, Physics, Particle physics, Hadron, Nuclear Theory, General Physics and Astronomy, Duality (optimization), Elementary particle, Resonance (particle physics), Nuclear physics, Magnetic form factor, Twist, Nucleon, Nuclear Experiment, Caltech Library Services
Abstract

A newly-obtained sample of inclusive electron-nucleon scattering data has been analyzed for precision tests of quark-hadron duality. The data are in the nucleon resonance region, and span the range 0.3 < Q{sup 2} < 5.0 (GeV/c){sup 2}. Duality is observed both in limited and extended regions around the prominent resonance enhancements. Higher twist contributions to the F{sub 2} structure function are found to be minimal on average, even in the low Q{sub 2} regime of approximately 0.5 (GeV/c){sup 2}. The proton magnetic form factor, extracted from purely inelastic data assuming duality, is in good agreement with the direct measurements. In all cases, duality appears to be a non-trivial property of the nucleon structure function.

Published
2000

15. Separated spectral functions for the quasifree12C(e,e′p)reaction

Author

R. E. Segel, W. Kim, K. Beard, R. Mohring, A.O. Mateos, D. van Westrum, S. A. Wood, J. C. Yang, S. Barrow, P. Stoler, C. E. Keppel, M. A. Khandaker, John C. Mitchell, C. Jackson, L. G. Tang, S. Danagoulian, T. Eden, Gabriel Niculescu, R. J. Sutter, D. Abbott, R. Sawafta, H. T. Fortune, C. Bochna, Alan M. Nathan, J. Yu, P. E. Bosted, I. Niculescu, O. K. Baker, Ketevi Assamagan, J. W. Martin, Donal Day, B. Terburg, T. P. Welch, E. R. Kinney, J. Reinhold, A. Ahmidouch, V. Tadevosyan, D. Beatty, Kevin Bailey, Ross Milner, E. Meier, C. Cothran, Ts A. Amatuni, E. Belz, Paul Gueye, R. E. Chrien, B. Zihlmann, D. F. Geesaman, Avraham Klein, C. Salgado, H. Breuer, Wolfgang Lorenzon, J. Arrington, D. DeSchepper, J.-E. Ducret, J. A. Dunne, J.-O. Hansen, D. G. Meekins, J. P. Schiffer, W. Hinton, R. Suleiman, E. J. Beise, S. B. Kaufman, Rolf Ent, H. E. Jackson, C. Yan, R. Madey, C. F. Williamson, V. Frolov, H. Mkrtchyan, R. D. Carlini, R. J. Holt, D. H. Potterveld, J. W. Price, W. Zhao, J. Cha, James J. Kelly, Ronald Gilman, Dipangkar Dutta, N. S. Chant, C. S. Armstrong, Pete Markowitz, E. E.W. Bruins, K. McFarlane, David Mack, S. Beedoe, C. E. Jones, L. H. Kramer, Thomas O'Neill, M. A. Miller, F. Duncan, Haiyan Gao, W. J. Cummings, D. Koltenuk, and B. Zeidman

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Missing energy, Proton, Nuclear Theory, Momentum transfer, Nuclear physics, Momentum, Parallel kinematics, Transverse plane, Physics::Accelerator Physics, Atomic physics, Nuclear Experiment, Nucleon
Abstract

A separation of the longitudinal and transverse 12 C(e, e8p) cross sections in the quasifree region has been performed in parallel kinematics at Q 2 of 0.64 and 1.8 GeV 2 for initial proton momentum ,80 MeV. The separated transverse and longitudinal spectral functions at Q 2 50.64 GeV 2 show significant differences for missing energy between 25 and 60 MeV indicating a breakdown in the single nucleon knockout picture. The transverse spectral functions exhibit definite momentum transfer dependence.

Published
2000

16. Coherentπ0photoproduction on the deuteron up to 4 GeV

Author

M. Witkowski, R. E. Segel, D. H. Potterveld, H. Breuer, C. Bochna, B. Zeidman, Ronald Ransome, D. G. Meekins, J. Cha, G. Collins, S. Barrow, R. Mohring, Thomas O'Neill, P. Stoler, Dipangkar Dutta, V. Frolov, S. F. Pate, H. Mkrtchyan, H. T. Fortune, E. J. Beise, D. Abbott, S. A. Wood, P. M. Rutt, J.-O. Hansen, N. Simicevic, C. S. Armstrong, Alan M. Nathan, R. Madey, Pete Markowitz, E. R. Kinney, R. Suleiman, David Mack, D. Beatty, C. Cothran, L. G. Tang, C. E. Keppel, W. Hinton, P. E. Bosted, I. Niculescu, S. E. Williamson, Haiyan Gao, R. V. Cadman, B. W. Filippone, J. Reinhold, O. K. Baker, W. F. Vulcan, Douglas H Beck, L. Cardman, Ronald Gilman, G. J. Kumbartzki, J. A. Dunne, R. D. McKeown, T. Eden, R. D. Carlini, A. Ahmidouch, M. Harvey, K. McFarlane, J. H. Mitchell, R. J. Holt, M. Khandaker, Ketevi Assamagan, Paul Gueye, A. F. Lung, C. Salgado, M. A. Miller, D. F. Geesaman, F. Duncan, G. Rakness, G. Savage, J. W. Price, J. Napolitano, B. Terburg, D. van Westrum, H. E. Jackson, B. R. Owen, S. Danagoulian, Gabriel Niculescu, Rolf Ent, C. Yan, Z. E. Meziani, J. Arrington, K. Gustafsson, E. J. Brash, D. Koltenuk, J. E. Belz, S. Beedoe, W. J. Cummings, T. A. Forest, N. S. Chant, and Avraham Klein

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Amplitude, Pion, Photon, Meson, Scattering, Hadron, Elementary particle, Photon energy, Nuclear Experiment
Abstract

The differential cross section for ^2H(γ,d)π^0 has been measured at deuteron center-of-mass angles of 90° and 136°. This work reports the first data for this reaction above a photon energy of 1 GeV, and permits a test of the apparent constituent counting rule and reduced nuclear amplitude behavior as observed in elastic ed scattering. Measurements were performed up to a photon energy of 4.0 GeV, and are in good agreement with previous lower energy measurements. Overall, the data are inconsistent with both constituent-counting rule and reduced nuclear amplitude predictions.

Published
1999

17. Inclusive Electron-Nucleus Scattering at Large Momentum Transfer

Author

R. A. Lindgren, C. Bochna, I. Niculescu, D. G. Meekins, W. U. Boeglin, T. Petitjean, T. Averett, S. A. Wood, D. J. Mack, Dipangkar Dutta, C. Cothran, O. Rondon, G. Niculescu, C. E. Keppel, J. Jourdan, C. S. Armstrong, B. Zihlmann, D. G. Crabb, Ingo Sick, Rolf Ent, H. Mkrtchyan, A. Honegger, J. A. Dunne, R. D. Carlini, Oliver Keith Baker, L.J. de Bever, G. Collins, Curtis Smith, J. Zhao, C. Yan, D. Koltenuk, B. W. Filippone, R. D. McKeown, J. Arrington, B. Bray, E. W. Hughes, Donal Day, B. Terburg, J. Jensen, James McCarthy, A. Lung, W. F. Vulcan, and J. H. Mitchell

Subjects
Physics, Series (mathematics), Scattering, Astrophysics::High Energy Astrophysical Phenomena, Momentum transfer, General Physics and Astronomy, FOS: Physical sciences, Electron, Nuclear matter, Nuclear physics, medicine.anatomical_structure, medicine, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment (nucl-ex), Nucleon, Nuclear Experiment, Scaling, Nucleus
Abstract

Inclusive electron scattering is measured with 4.045 GeV incident beam energy from C, Fe and Au targets. The measured energy transfers and angles correspond to a kinematic range for Bjorken $x > 1$ and momentum transfers from $Q^2 = 1 - 7 (GeV/c)^2$. When analyzed in terms of the y-scaling function the data show for the first time an approach to scaling for values of the initial nucleon momenta significantly greater than the nuclear matter Fermi-momentum (i.e. $> 0.3$ GeV/c)., 5 pages TEX, 5 Postscript figures also available at http://www.krl.caltech.edu/preprints/OAP.html

Published
1998
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18. Measurement of the Proton's Neutral Weak Magnetic Form Factor

Author

E. Candell, J. Napolitano, Michael Pitt, B. Terburg, M. Farkhondeh, S. Kowalski, G. W. Dodson, Douglas H Beck, F. Duncan, R. D. McKeown, B. W. Filippone, A. Lung, S. P. Wells, R. C. DiBari, R. Mohring, R. Carr, B. Mueller, Lawrence Cardman, K. A. Dow, T. A. Forest, N. Simicevic, Haiyan Gao, E. J. Beise, D. Nilsson, and Wolfgang Korsch

Subjects
Proton, media_common.quotation_subject, Nuclear Theory, FOS: Physical sciences, General Physics and Astronomy, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Asymmetry, Nuclear physics, 0103 physical sciences, Magnetic form factor, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, media_common, Physics, Elastic scattering, Magnetic moment, 010308 nuclear & particles physics, Scattering, Proton magnetic moment, 3. Good health, High Energy Physics::Experiment, Atomic physics, Electron scattering, Caltech Library Services
Abstract

We report the first measurement of the parity-violating asymmetry in elastic electron scattering from the proton. The asymmetry depends on the neutral weak magnetic form factor of the proton which contains new information on the contribution of strange quark-antiquark pairs to the magnetic moment of the proton. We obtain the value $G_M^Z= 0.34 \pm 0.09 \pm 0.04 \pm 0.05$ n.m. at $Q^2=0.1$ (GeV/c)${}^2$., 4 pages TEX, text available at http://www.krl.caltech.edu/preprints/OAP.html

Published
1997

19. Proton propagation through nuclei and the quasi-free reaction mechanism studied with

Author

Eppo E. W. Bruins, Sheldon Kaufman, V. Tadevosyan, Thomas O'Neill, Wooyoung Kim, John Arrington, Juerg Reinhold, C. Cothran, Kenneth McFarlane, J.-O. Hansen, Carlos Salgado, E. R. Kinney, Richard Madey, C. Yan, Beni Zihlmann, W. Zhao, W. J. Cummings, Shelton Beedoe, H. Mkrtchyan, Ketevi Assamagan, Dave Potterveld, Richard Milner, Donal Day, B. Terburg, Andi Klein, J. Fedchak, Tom Eden, Ralph Segel, Mike Miller, Pete Markowitz, H. T. Fortune, Rolf Ent, Joseph Mitchell, F. Duncan, D. G. Meekins, L. G. Tang, J. A. Dunne, R. D. Carlini, D. van Westrum, E. J. Beise, Jeffrey Martin, C. Bochna, S. Danagoulian, Cathleen Jones, Gabriel Niculescu, D. Beatty, Wolfgang Lorenzon, L. H. Kramer, J. W. Price, David Mack, P. Stoler, D. Abbott, V. V. Frolov, Ben Zeidman, Stephen Barrow, Claude Williamson, Paul Gueye, Mahbub Khandaker, D. F. Geesaman, Jean-Eric Ducret, J. Yu, I. Niculescu, J. P. Schiffer, Oliver K. Baker, James J. Kelly, N. S. Chant, K. Beard, C. Jackson, R. Mohring, R. J. Holt, A. Ahmidouch, C. E. Keppel, E. Belz, Ts A. Amatuni, A. F. Lung, Hal Jackson, W. Hinton, H. Breuer, Riad Suleiman, S. A. Wood, Haiyan Gao, Ronald Gilman, Doug Koltenuk, William Turchinetz, Arthur Mateos, D. DeSchepper, J. C. Yang, Pat Welch, J. Cha, Dipangkar Dutta, and C. S. Armstrong

Subjects
Nuclear reaction, Nuclear physics, Physics, Proton, Momentum transfer, Hadron, Elementary particle, Atomic physics, Nuclear Experiment, Nucleon, Energy (signal processing), Charged particle
Abstract

Jefferson Lab experiment E91-013 measured the energy dependence of proton propagation in nuclei, using the quasi-free (e, e{prime}p) reaction. The ratios of the experimental (e, e{prime}p) cross-sections integrated over the quasi-free region to PWIA calculations are presented as a function of momentum transfer, (0.6 < Q{sup 2} < 3.3 GeV{sup 2}) and target nucleus (C, Fe and Au). As a first step towards a longitudinal and transverse separation of the quasi-free cross-section, a super ratio of the measured to the calculated cross-sections at forward and backward angles is presented.

Published
1997

20. The SAMPLE experiment: Parity-violating electron scattering from the proton and deuteron

Author

M. Witkowski, B. Mueller, E. Candell, Wolfgang Korsch, F. Duncan, John Arrington, Douglas H Beck, G. Dodson, R. D. McKeown, T. A. Forest, A. Lung, R. Carr, S. Kowalski, M. Farkhondeh, Michael Pitt, N. Simicevic, Lawrence Cardman, B. W. Filippone, J. Napolitano, B. Terburg, Haiyan Gao, E. J. Beise, R. Mohring, and K. Dow

Subjects
Physics, Quark, Elastic scattering, Strange quark, Particle physics, Proton, media_common.quotation_subject, Nuclear Theory, Hadron, Asymmetry, Nuclear physics, Magnetic form factor, High Energy Physics::Experiment, Nuclear Experiment, Nucleon, media_common
Abstract

Recent experimental evidence on nucleon structure has provided indications that some strange quark matrix elements can be comparable to those involving up and down quarks. The SAMPLE experiment will determine the strange magnetic form factor GsM at Q2=0.1 (GeV/c)2 from a measurement of the asymmetry in the scattering of polarized electrons from the proton. The error on the extraction of GsM is ultimately limited by a theoretical uncertainty—the uncertain electroweak hadronic radiative correction to the axial form factor, RT=1A. To address this issue, the collaboration is also approved to measure the asymmetry in parity‐violating quasielastic electron scattering from the deuteron. The combination of the proton and deuteron measurements will yield a value of GsM that is almost completely free of the uncertainty in RT=1A.

Published
1995

21. Results from CEBAF experiment E89-012: Measurements of deuteron photo-disintegration up to 4 GeV

Author

Haiyan Gao, S. Beedoe, N. Simicevic, J. H. Mitchell, S. Pate, B. Zeidman, A. M. Nathan, E. R. Kinney, W. F. Vulcan, S. E. Williamson, D. M. Koltenuk, J. Cha, R. D. McKeown, B. W. Filippone, D. F. Geesaman, Richard Madey, A. Ahmidouch, Dipangkar Dutta, D. H. Potterveld, S. A. Wood, I. Niculescu, J. Napolitano, Pete Markowitz, E. J. Brash, B. Terburg, H. T. Fortune, Z. E. Meziani, R. V. Cadman, M. Khandaker, R. D. Carlini, G. Savage, D. van Westrum, R. J. Holt, J.-O. Hansen, C. S. Armstrong, Paul Gueye, D. J. Mack, Douglas H Beck, S. Barrow, C. Bochna, A. Klein, B. R. Owen, K. K. Gustafsson, C. Yan, G. Collins, T. A. Forest, Rolf Ent, P. E. Bosted, P. Stoler, Thomas O'Neill, L. Tang, J. Reinhold, J. E. Belz, G. Kumbartzki, P. M. Rutt, R. Suleiman, R. E. Segel, D. Abbott, H. Breuer, G. Niculescu, V. Frolov, K. McFarlane, D. Beatty, H. Mkrtchyan, L. Cardman, A. F. Lung, W. J. Cummings, M. Witkowski, J. A. Dunne, H. E. Jackson, J. W. Price, D. G. Meekins, Oliver Keith Baker, M. A. Miller, F. Duncan, R. Mohring, W. Hinton, C. E. Keppel, J. Arrington, M. Harvey, Ronald Gilman, E. J. Beise, G. Rakness, Ronald Ransome, S. Danagoulian, Ketevi Assamagan, C. Cothran, N. S. Chant, and T. Eden

Subjects
Nuclear reaction, Physics, Particle physics, Proton, Meson, Hadron, Particle accelerator, law.invention, Baryon, Nuclear physics, law, Center of mass, Nuclear Experiment, Nucleon
Abstract

The first measurements of differential cross sections for deuteron photo-disintegration at photon energies up to 4 GeV were performed at the Thomas Jefferson National Accelerator Facility early in 1996. Cross section results for D(γ,p)n at proton center of mass angle of 35°, 53° and 90° will be presented. These results are in good agreement with previous measurements at low energy and extend to higher energies where data were previously unavailable. The 90° degree data show behavior consistent with the constituent counting rules up to 4 GeV and are also in fair agreement with the asymptotic meson exchange model. The 37° and 53° data do not show clear signs of counting rule behavior, although a threshold in transverse momentum for the onset of scaling cannot be excluded.

22. Longitudinal electroproduction of charged pions from (1)H, (2)H, and (3)He.

Author

Gaskell D, Ahmidouch A, Ambrozewicz P, Anklin H, Arrington J, Assamagan K, Avery S, Bailey K, Baker OK, Beedoe S, Beise B, Breuer H, Brown DS, Carlini R, Cha J, Chant N, Cowley A, Danagoulian S, De Schepper D, Dunne J, Dutta D, Ent R, Gan L, Gasparian A, Geesaman DF, Gilman R, Glashausser C, Gueye P, Harvey M, Hashimoto O, Hinton W, Hofman G, Jackson C, Jackson HE, Keppel C, Kinney E, Koltenuk D, Kyle G, Lung A, Mack D, McKee D, Mitchell J, Mkrtchyan H, Mueller B, Niculescu G, Niculescu I, O'Neill TG, Papavassiliou V, Potterveld D, Reinhold J, Roos P, Sawafta R, Segel R, Stepanyan S, Tadevosyan V, Takahashi T, Tang L, Terburg B, Van Westrum D, Volmer J, Welch TP, Wood S, Yuan L, Zeidman B, and Zihlmann B

Abstract

Separated longitudinal and transverse cross sections for charged pion electroproduction from (1)H, (2)H, and (3)He were measured at Q(2) = 0.4 (GeV/c)(2) for two values of the invariant mass, W = 1.15 GeV and W = 1.60 GeV, in a search for a mass dependence which would signal the effect of nuclear pions. This is the first such study that includes recoil momenta significantly above the Fermi surface. The longitudinal cross section, if dominated by the pion-pole process, should be sensitive to nuclear pion currents. Comparisons of the longitudinal cross section target ratios to a quasifree calculation reveal a significant suppression in (3)He at W = 1.60 GeV. The W = 1.15 GeV results are consistent with simple estimates of the effect of nuclear pion currents, but are also consistent with pure quasifree production.

Published
2001
Full Text
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