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Your search keyword '"D. H. Barkhuff"' showing total 4 results
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4 results on '"D. H. Barkhuff"'

1. Search for Quadrupole Strength in the Electroexcitation of theΔ+(1232)

Author

A. J. Sarty, C. Mertz, B. D. Milbrath, J. Chen, C. F. Perdrisat, K. Joo, R. W. Lourie, K. Dow, J. J. Kelly, A. Bernstein, W. Bertozzi, G. A. Warren, D. H. Barkhuff, J. H. Mitchell, P. E. Ulmer, N. Kaloskamis, D. Tieger, R. J. Woo, C. Papanicolas, J. R. Comfort, J. M. Finn, J. I. McIntyre, S. Dolfini, C. Tschalær, W. Turchinetz, R. Miskimen, C. Kunz, G. Dodson, V. Burkert, L. Weinstein, M. Farkhondeh, A. Karabarbounis, S. Kowalski, J. Shaw, A. Young, S. E. Williamson, C. Vellidis, S. Van Verst, S. Soong, S. Gilad, Ricardo Alarcon, X. Jiang, and R. W. Gothe

Subjects
Delta, Nuclear physics, Physics, Cross section.transverse, Amplitude, Quadrupole, General Physics and Astronomy, Angular dependence, Excitation
Abstract

High precision 1H(e, e'p)pi0 measurements at Q2 = 0.126. (GeV/c)2 are reported, which allow the determination of quadrupole amplitudes in the gamma*N --> Delta transition; they simultaneously test the reliability of electroproduction models. The derived quadrupole-to-dipole (I = 3/2) amplitude ratios, RSM = (-6.5 +/- 0.2stat+sys+/-2.5mod)% and REM = 9-2.1 +/-0.2stat+sys +/-2.0mod)%, are dominated by model error. Previous RSM and REM results should be reconsidered after the model uncertainties associated with the method of their extraction are taken into account.

Published
2001

2. Induced proton polarization forπ0electroproduction atQ2=0.126 GeV2/c2around theΔ(1232)resonance

Author

S. E. Williamson, X. Jiang, B. Asavapibhop, G. W. Dodson, Glen A. Warren, Larry Weinstein, A. J. Sarty, S. B. Soong, K. Joo, D. J. Margaziotis, S. Kowalski, James J. Kelly, Shalev Gilad, C. Vellidis, K. A. Dow, C. S. Armstrong, L. M. Qin, P. Markowitz, Jiunn-Wei Chen, A. Young, R. W. Gothe, D. S. Dale, Justin I. McIntyre, Volker D. Burkert, P. M. Rutt, Ricardo Alarcon, J. P. Chen, M. B. Epstein, D. Liu, R. J. Woo, C. Tschalaer, V. A. Punjabi, D. H. Barkhuff, M. K. Jones, William Bertozzi, D. R. Tieger, J. M. Finn, A. Karabarbounis, J. R. Comfort, M. Farkhondeh, S. Van Verst, B. D. Milbrath, Richard Madey, R. A. Miskimen, S. Mukhopadhyay, S. Dolfini, C. Kunz, C. F. Perdrisat, J. Shaw, Costas N. Papanicolas, P. E. Ulmer, R.W. Lourie, W. Turchinetz, John C. Mitchell, and C. Mertz

Subjects
Physics, Baryon, Nuclear and High Energy Physics, Particle physics, Pion, Proton, Meson, Hadron, Elementary particle, Nucleon, Delta baryon
Abstract

We present a measurement of the induced proton polarization ${P}_{n}$ in ${\ensuremath{\pi}}^{0}$ electroproduction on the proton around the $\ensuremath{\Delta}$ resonance. The measurement was made at a central invariant mass and a squared four-momentum transfer of $W=1231 \mathrm{MeV}$ and ${Q}^{2}=0.126 {\mathrm{GeV}}^{2}{/c}^{2},$ respectively. We measured a large induced polarization, ${P}_{n}=\ensuremath{-}0.397\ifmmode\pm\else\textpm\fi{}0.055\ifmmode\pm\else\textpm\fi{}0.009.$ The data suggest that the scalar background is larger than expected from a recent effective Hamiltonian model.

Published
1998

3. Search for quadrupole strength in the electroexcitation of the delta+(1232)

Author

C, Mertz, C E, Vellidis, R, Alarcon, D H, Barkhuff, A M, Bernstein, W, Bertozzi, V, Burkert, J, Chen, J R, Comfort, G, Dodson, S, Dolfini, K, Dow, M, Farkhondeh, J M, Finn, S, Gilad, R W, Gothe, X, Jiang, K, Joo, N I, Kaloskamis, A, Karabarbounis, J J, Kelly, S, Kowalski, C, Kunz, R W, Lourie, J I, McIntyre, B D, Milbrath, R, Miskimen, J H, Mitchell, C N, Papanicolas, C F, Perdrisat, A J, Sarty, J, Shaw, S B, Soong, D, Tieger, C, Tschalaer, W, Turchinetz, P E, Ulmer, S, Van Verst, G A, Warren, L B, Weinstein, S, Williamson, R J, Woo, and A, Young

Abstract

High-precision 1H(e,e'p)pi(0) measurements at Q2 = 0.126 (GeV/c)2 are reported, which allow the determination of quadrupole amplitudes in the gamma*N--Delta transition; they simultaneously test the reliability of electroproduction models. The derived quadrupole-to-dipole ( I = 3/2) amplitude ratios, R(SM) = (-6.5+/-0.2(stat+sys)+/-2.5(mod))% and R(EM) = (-2.1+/-0.2(stat+sys)+/-2.0(mod))%, are dominated by model error. Previous R(SM) and R(EM) results should be reconsidered after the model uncertainties associated with the method of their extraction are taken into account.

Published
2000

4. Erratum: Comparison of Polarization Observables in Electron Scattering from the Proton and Deuteron [Phys. Rev. Lett. 80, 452 (1998)]

Author

B. D. Milbrath, J. I. McIntyre, C. S. Armstrong, D. H. Barkhuff, W. Bertozzi, J. P. Chen, D. Dale, G. Dodson, K. A. Dow, M. B. Epstein, M. Farkhondeh, J. M. Finn, S. Gilad, M. K. Jones, K. Joo, J. J. Kelly, S. Kowalski, R. W. Lourie, R. Madey, D. J. Margaziotis, P. Markowitz, C. Mertz, J. Mitchell, C. F. Perdrisat, V. Punjabi, L. Qin, P. M. Rutt, A. J. Sarty, D. Tieger, C. Tschalær, W. Turchinetz, P. E. Ulmer, S. P. Van Verst, G. A. Warren, L. B. Weinstein, and R. J. Woo

Subjects
General Physics and Astronomy
Published
1999

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