Search

Your search keyword '"S. J. Gaff"' showing total 17 results
Start Over Author "S. J. Gaff" Topic general physics and astronomy
17 results on '"S. J. Gaff"'

1. Temperature Measurements for CentralAu+AuCollisions at35AMeV

Author

J. D. Dinius, Rinaldo Rui, F. Petruzzelli, M. J. Huang, M. D'Agostino, F. Gramegna, W. G. Lynch, L. Martin, A. Moroni, G. Tagliente, M. B. Tsang, T. Glasmacher, Evan Scannapieco, P. F. Mastinu, I. Iori, Hongfei Xi, G. J. Kunde, C. K. Gelbke, M. L. Fiandri, Nicola Colonna, P. M. Milazzo, S. J. Gaff, M. Azzano, C. P. Montoya, M. Bruno, A. Ferrero, Giacomo Vito Margagliotti, L. Celano, and G. Vannini

Subjects
Physics, Yield (engineering), Excited state, Extrapolation, Zero (complex analysis), General Physics and Astronomy, Atomic physics, Impact parameter, Nuclear Experiment, Temperature measurement
Abstract

The breakup temperatures for central $\mathrm{Au}+\mathrm{Au}$ collisions at $35A\mathrm{MeV}$ have been determined from the relative populations of excited states of ${}^{5}\mathrm{Li}$, ${}^{4}\mathrm{He}$, and ${}^{10}\mathrm{B}$ fragments and nine double ratios involving the yields of elements with $1\ensuremath{\le}Z\ensuremath{\le}6$. Unlike results reported at significantly higher energies, all thermometers yield temperatures that are consistent within the experimental uncertainties. Extrapolation of the data to zero impact parameter yields ${T}_{\mathrm{em}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}4.6\ifmmode\pm\else\textpm\fi{}0.4\mathrm{MeV}$, somewhat lower than the temperature assumed in statistical multifragmentation model calculations which describe most of the other features of this reaction.

Published
1997

2. Multifragment Production in Reactions ofS112n+S112nandS124n+S124natE/A=40MeV

Author

M. J. Huang, R. J. Charity, W. Skulski, M. B. Tsang, J. Dempsey, L. G. Sobotka, L. Martin, W. A. Friedman, L. Manduci, Dileep Agnihotri, C. K. Gelbke, R. Lemmon, S. J. Gaff, W. G. Lynch, Jan Toke, W. U. Schröder, B. Djerroud, G. J. Kunde, T. Glasmacher, and K. Wyrozebski

Subjects
Physics, Proton, Astrophysics::High Energy Astrophysical Phenomena, General Physics and Astronomy, Neutron, Multiplicity (mathematics), Atomic physics, Nuclear Experiment, Charged particle
Abstract

Multiplicities of intermediate-mass fragments (IMFs), neutrons, and charged particles were measured for ${}^{112}\mathrm{Sn}{+}^{112}\mathrm{Sn}$ and ${}^{124}\mathrm{Sn}{+}^{124}\mathrm{Sn}$ at $E/A\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}40\mathrm{MeV}$. Significantly different scalings of the mean IMF multiplicities with neutron and charged-particle multiplicities are observed for the two reactions. These differences can be qualitatively understood in terms of fragment emission from an expanding evaporating source for which the initial rates of cooling by neutron and light-charged-particle emission depend on the neutron and proton numbers of the source according to statistical expectations.

Published
1996

3. Conceptual questions in computer‐assisted assignments

Author

W. L. Stretch, E. Kashy, D. J. Morrissey, Y. Tsai, S. L. Wolfe, N. H. Pawley, and S. J. Gaff

Subjects
Physics, Science instruction, Higher education, business.industry, Concept learning, GRASP, ComputingMilieux_COMPUTERSANDEDUCATION, Mathematics education, General Physics and Astronomy, Computer-Assisted Instruction, business, Formal evaluation
Abstract

The computer‐assisted personalized assignment system has been used to prepare and present conceptual, qualitative questions to students in large introductory classes. The questions appear to be effective in helping students to grasp concepts, as they stimulate dialogue and discussion among the students while they are seeking correct solutions, and provide the instructor with feedback on difficulties students encounter with certain concepts. No formal evaluation of the effectiveness of these questions has been made. Many conceptual, qualitative questions for introductory physics have been written with this system and used in assignments. Several examples are given and briefly discussed.

Published
1995

4. Publisher’s Note: Observation of an Exotic Baryon withS=+1in Photoproduction from the Proton [Phys. Rev. Lett.PRLTAO0031-900792, 032001 (2004)]

Author

K. Park, Clarisse Tur, Volker D. Burkert, A. K. Opper, Shifeng Chen, A. S. Biselli, M. Osipenko, U. Thoma, L. C. Smith, K. Beard, S. J. Gaff, R. W. Major, B. Carnahan, F. Sabatié, E. Polli, G. V. O'Rielly, B. M. Preedom, J. Lachniet, D. Rowntree, L. Elouadrhiri, V. Gyurjyan, J. P. Santoro, L. Ciciani, K. A. Griffioen, S. Simionatto, D. G. Jenkins, Roy Thompson, K. Sabourov, Thierry Auger, K. L. Giovanetti, B. Asavapibhop, Larry Weinstein, Dinko Pocanic, I. I. Strakovsky, G. Gavalian, V. Mokeev, R. S. Hakobyan, Brian Raue, S. E. Kuhn, K. Wang, R. C. Minehart, R. A. Miskimen, C. A. Meyer, J. Langheinrich, E. De Sanctis, V. V. Frolov, J. H. Kelley, Stephen Taylor, H. Bagdasaryan, S. A. Philips, G. S. Adams, F. W. Hersman, S. McAleer, G. A. Peterson, J. P. Cummings, O. P. Dzyubak, R. A. Niyazov, D. Branford, M. Mirazita, J. W. Price, L. Guo, M. Ungaro, S. Barrow, B. L. Berman, John T. O'Brien, W. Kim, M. Kossov, D. I. Sober, P. L. Cole, P. Dragovitsch, J. M. Laget, L. M. Qin, Laird Kramer, H. Egiyan, D. P. Weygand, P. Corvisiero, Alexei V. Klimenko, R. Fatemi, J. R. Ficenec, Rakhsha Nasseripour, L. Todor, D. Protopopescu, William Brooks, A. V. Vlassov, P. Eugenio, M. Taiuti, M. Anghinolfi, S. Strauch, S. Niccolai, Hall Crannell, S. Pozdniakov, M. Garçon, C. S. Whisnant, Federico Ronchetti, James Mueller, M. Spraker, C. Cetina, Frank Klein, G. S. Mutchler, Barry Ritchie, J. Hardie, Michael Vineyard, A. Longhi, J. R. Calarco, R. DeVita, J. W C McNabb, Y. G. Sharabian, R. W. Gothe, M. Guidal, M. Klusman, M. Guillo, N. Benmouna, A.V. Stavinsky, J. J. Melone, A. Weisberg, P. Stoler, J. Hu, K. Joo, C. Marchand, Ji Li, M. Ripani, G. Niculescu, Carlos A. Salgado, S. A. Morrow, P. Rubin, J. Yun, D. Cords, A. Shafi, M. D. Mestayer, P. Heimberg, C. Djalali, D. J. Tedeschi, A. Yegneswaran, Patrick Girard, J. J. Manak, J. Shaw, S. O. Nelson, K. Hicks, Michael Wood, S. Boiarinov, M. Holtrop, Thomas E. Smith, R. A. Schumacher, E. S. Smith, K. S. Egiyan, P. Ambrozewicz, V. S. Serov, K. Mikhailov, Cynthia Marie Hadjidakis, H. Denizli, Sylvain Bouchigny, H. Juengst, Michael Dugger, H. O. Funsten, C. I O Gordon, P. Rossi, L. Farhi, M. Nozar, M. Bellis, M. U. Mozer, L. Morand, T. A. Forest, S. Stepanyan, G. Audit, V. Sapunenko, G. E. Dodge, J. Connelly, A. V. Skabelin, K. V. Dharmawardane, R. J. Feuerbach, P. V. Degtyarenko, K. Kim, V. P. Kubarovsky, Valeria Muccifora, I. Niculescu, D. Lawrence, M. Bektasoglu, A. Empl, B. B. Niczyporuk, O. Pogorelko, D. Hancock, N. Pivnyuk, K. Lukashin, J. Napolitano, L. C. Dennis, Gerard Gilfoyle, Jens H. Kuhn, Nicola Bianchi, H. Avakian, M. M. Ito, W. J. Briscoe, M. Battaglieri, E. Pasyuk, S. A. Dytman, R. Bradford, B. A. Mecking, E. Anciant, M. Khandaker, D. Doughty, D. Heddle, Yordanka Ilieva, S. Mehrabyan, Kwangsoo Kim, G. Riccardi, C. Butuceanu, E. Wolin, J. P. Ball, Y. Prok, D. S. Carman, M. Sargsyan, and D. G. Crabb

Subjects
Nuclear physics, Physics, Particle physics, Proton, Exotic baryon, Hyperon, General Physics and Astronomy
Published
2004

5. Measurement of the Proton Spin Structure Functiong1(x,Q2)forQ2from 0.15 to1.6 GeV2with CLAS

Author

S. J. Gaff, D. Doughty, M. Seely, G. Ricco, D. Heddle, R. J. Feuerbach, Philip L. Cole, C. S. Whisnant, L. Farhi, Bernhard Mecking, V. Sapunenko, Dinko Pocanic, Valeria Muccifora, K. V. Dharmawardane, C. D. Keith, P. Eugenio, Shalev Gilad, M. Taiuti, M. Guillo, Gerard Gilfoyle, S. E. Kuhn, R. A. Niyazov, John T. O'Brien, S. Strauch, Friedrich Klein, L. C. Dennis, B. E. Bonner, B. Carnahan, F. Sabatié, W. K. Brooks, L. M. Qin, P. Corvisiero, J. H. Kelley, R. S. Hicks, Brian Raue, Jing Zhao, William Bertozzi, C. Tur, S. Mehrabyan, D. Protopopescu, J. P. Cummings, H. R. Weller, Volker D. Burkert, C. Cetina, A. S. Biselli, S. Pozdniakov, M. Garçon, Thierry Auger, J. R. Calarco, F. W. Hersman, K. S. Egiyan, V. Koubarovski, K. Mikhailov, E. Anciant, Michael Vineyard, Baile Zhang, E. Pasyuk, B. M. Preedom, G. V. O'Rielly, L. Elouadrhiri, Z. L. Zhou, C. Butuceanu, M. Kossov, W. Kim, E. Wolin, R. A. Miskimen, S. A. Dytman, M. Ripani, J. P. Santoro, C. E. Hyde-Wright, J. Hu, D. Branford, Rakhsha Nasseripour, M. Khandaker, A. V. Skabelin, G. S. Mutchler, D. G. Jenkins, Susan Taylor, H. Egiyan, K. Sabourov, J. P. Ball, Y. Prok, M. Eckhause, M. Sargsyan, D. G. Crabb, M. Spraker, Y. Ilieva, Patrick Girard, J. Shaw, Michael Wood, M. Mirazita, J. M. Laget, K. Wang, C. Salgado, P. E. Bosted, A. P. Freyberger, Harut Avakian, Y. Kuang, K. Y. Kim, C. Marchand, Laird Kramer, V. S. Serov, S. McAleer, E. Polli, M. Battaglieri, M. Bellis, K. Park, Federico Ronchetti, K. A. Griffioen, Roy Thompson, V. Frolov, Elton Smith, M. Guidal, R. Bradford, M. M. Ito, J. Ficenec, G. Niculescu, L. Ciciani, A. Longhi, M. Klusman, Ji Li, L. Todor, R. Clark, P. Heimberg, Jens H. Kuhn, M. Holtrop, Thomas E. Smith, M. Anghinolfi, M. D. Mestayer, A. Empl, O. Pogorelko, S. Simionatto, J. D. Kellie, S. Stepanyan, Nicola Bianchi, K. Lukashin, Sylvain Bouchigny, K. Livingston, James Mueller, H. Funsten, Cynthia Marie Hadjidakis, K. L. Giovanetti, B. Asavapibhop, P. Rossi, S. Boiarinov, P. D. Rubin, J. W. Price, Michael Dugger, Larry Weinstein, M. Osipenko, Y. G. Sharabian, H. Denizli, Daniel S. Carman, G. Audit, K. Beard, G. A. Peterson, J. Connelly, Kalvir S. Dhuga, Alexei V. Klimenko, S. Barrow, M. Bektasoglu, G. Gavalian, Barry Ritchie, M. Nozar, R. C. Minehart, C. A. Meyer, P. Stoler, S. O. Nelson, K. Hicks, R. Fatemi, A. V. Vlassov, R. De Vita, J. J. Manak, E. De Sanctis, D. I. Sober, A.V. Stavinsky, L. Sorrel, D. J. Tedeschi, V. Gyurjyan, H. Bagdasaryan, D. Hancock, L. Guo, M. Ungaro, P. Dragovitsch, S. Niccolai, K. Joo, J. Yun, J. Hardie, D. Cords, A. Yegneswaran, G. E. Dodge, P. V. Degtyarenko, K. Kim, I. Niculescu, D. Lawrence, R. A. Schumacher, J. Lachniet, D. Rowntree, C. I O Gordon, L. Morand, T. A. Forest, A. Coleman, B. B. Niczyporuk, N. Pivnyuk, S. E. Rock, Avraham Klein, J. Napolitano, W. Major, G. S. Adams, Hall Crannell, G. Riccardi, J. W C McNabb, S. A. Morrow, C. Djalali, U. Thoma, D. P. Weygand, and L. C. Smith

Subjects
Physics, Nuclear physics, Particle physics, Scattering, Proton spin crisis, General Physics and Astronomy, Electron, Nucleon, Parametrization, Resonance (particle physics), Scaling, Sign (mathematics)
Abstract

Double-polarization asymmetries for inclusive $ep$ scattering were measured at Jefferson Lab using 2.6 and 4.3 GeV longitudinally polarized electrons incident on a longitudinally polarized NH$_3$ target in the CLAS detector. The polarized structure function $g_1(x,Q^2)$ was extracted throughout the nucleon resonance region and into the deep inelastic regime, for $Q^2 = 0.15 -1.64 $GeV$^2$. The contributions to the first moment $\Gamma_1(Q^2) = \int g_1(x,Q^2)dx$ were determined up to $Q^2=1.2$ GeV$^2$. Using a parametrization for $g_1$ in the unmeasured low $x$ regions, the complete first moment was estimated over this $Q^2$ region. A rapid change in $\Gamma_1$ is observed for $Q^2 < 1 $GeV$^2$, with a sign change near $Q^2 = 0.3 $GeV$^2$, indicating dominant contributions from the resonance region. At $Q^2=1.2$ GeV$^2$ our data are below the pQCD evolved scaling value.

Published
2003

6. Measurement ofep→e′pπ+π−and Baryon Resonance Analysis

Author

R. Fatemi, A. Cazes, M. U. Mozer, Bernhard Mecking, K. V. Dharmawardane, A. V. Vlassov, J. Hu, M. Battaglieri, R. Bradford, R. De Vita, E. Wolin, J. J. Manak, R. A. Niyazov, B. Carnahan, Jing Zhao, S. A. Philips, E. De Sanctis, Thierry Auger, D. I. Sober, Patrick Girard, J. Shaw, Michael Wood, P. Corvisiero, E. Golovach, J. P. Ball, Y. Prok, V. S. Serov, R. A. Schumacher, Daniel S. Carman, D. Protopopescu, S. Pozdniakov, M. Garçon, M. Eckhause, G. Ricco, G. Audit, Z. L. Zhou, A. Shafi, C. E. Hyde-Wright, Philip L. Cole, M. Taiuti, M. Ripani, Moshe Gai, Friedrich Klein, M. Bektasoglu, R. S. Hicks, Brian Raue, L. Morand, T. A. Forest, Roy Thompson, Avraham Klein, G. E. Dodge, S. A. Morrow, D. G. Crabb, I. I. Strakovsky, C. Djalali, P. V. Degtyarenko, K. Kim, G. S. Adams, B. M. Preedom, M. Spraker, M. Bellis, K. Park, B. L. Berman, I. Niculescu, K. Joo, D. Lawrence, J. P. Santoro, M. Klusman, E. Anciant, M. Guidal, G. Niculescu, W. K. Brooks, L. M. Qin, A. Empl, O. Pogorelko, K. Lukashin, B. E. Bonner, M. Holtrop, U. Thoma, H. Avakian, D. P. Weygand, Dinko Pocanic, Gerald Feldman, A. K. Opper, S. E. Kuhn, W. J. Briscoe, E. Pasyuk, K. Wang, F. W. Hersman, S. A. Dytman, R. A. Miskimen, J. H. Kelley, C. Salgado, M. Khandaker, M. Nozar, B. B. Niczyporuk, N. Pivnyuk, P. Stoler, D. Branford, J. Napolitano, Elton Smith, Ji Li, Cynthia Marie Hadjidakis, M. Mirazita, J. M. Laget, G. V. O'Rielly, Michael Dugger, S. O. Nelson, M. D. Mestayer, L. Elouadrhiri, K. Hicks, M. Anghinolfi, Laird Kramer, J. P. Cummings, James Mueller, S. Boiarinov, K. S. Egiyan, G. Riccardi, J. W C McNabb, V. Sapunenko, P. D. Rubin, F. Ronchetti, Y. G. Sharabian, Valeria Muccifora, K. Mikhailov, D. G. Jenkins, M. Kossov, K. Sabourov, Rakhsha Nasseripour, J. Ficenec, M. Guillo, Gerard Gilfoyle, L. Ciciani, Hall Crannell, W. Kim, Baile Zhang, R. C. Minehart, J. R. Calarco, C. A. Meyer, S. Simionatto, C. Cetina, Michael Vineyard, P. Dragovitsch, Volker D. Burkert, A. S. Biselli, G. V. Fedotov, Y. Kuang, L. Y. Murphy, E. Polli, K. Y. Kim, A. Longhi, S. Niccolai, S. McAleer, C. Marchand, K. L. Giovanetti, B. Asavapibhop, H. Funsten, S. Stepanyan, Sylvain Bouchigny, J. W. Price, P. Rossi, L.C. Dennis, M. M. Ito, L. Todor, J. Hardie, H. Denizli, Larry Weinstein, L. C. Smith, S. J. Gaff, B. S. Ishkhanov, B. P. Quinn, D. Doughty, H. R. Weller, Alexei V. Klimenko, Barry Ritchie, D. Heddle, M. Osipenko, F. Sabatié, K. Beard, A. V. Skabelin, G. Gavalian, V. Mokeev, G. S. Mutchler, K. A. Griffioen, P. Heimberg, J. D. Kellie, Shalev Gilad, R. J. Feuerbach, A.V. Stavinsky, D. J. Tedeschi, J. S. McCarthy, J. Lachniet, D. Rowntree, Jens H. Kuhn, L. Guo, M. Ungaro, Nicola Bianchi, A. Coleman, Susan Taylor, H. Egiyan, C. S. Whisnant, K. Livingston, G. A. Peterson, S. Barrow, J. Yun, D. Cords, A. Yegneswaran, V. Gyurjyan, and H. Bagdasaryan

Subjects
Baryon, Nuclear physics, Physics, Particle physics, Meson production, Resonance analysis, General Physics and Astronomy, Resonance (particle physics)
Abstract

The cross section for the reaction ep→e'ppi(+)pi(-) was measured in the resonance region for 1.4 lt W lt 2.1 GeV and 0.5 lt Q(2) lt 1.5 GeV2/c(2) using the CLAS detector at Jefferson Laboratory. The data show resonant structures not visible in previous experiments. The comparison of our data to a phenomenological prediction using available information on N* and Delta states shows an evident discrepancy. A better description of the data is obtained either by a sizable change of the properties of the P-13(1720) resonance or by introducing a new baryon state, not reported in published analyses.

Published
2003

7. First Measurement of Transferred Polarization in the Exclusivee→p→e′K+Λ→Reaction

Author

L. Guo, M. Ungaro, R. Fatemi, D. S. Armstrong, A. V. Vlassov, R. C. Minehart, C. A. Meyer, G. V. Fedotov, C. Bennhold, A. Coleman, H. R. Weller, V. Sapunenko, Valeria Muccifora, J. Yun, D. Cords, L. Elouadrhiri, D. P. Weygand, Baile Zhang, J. J. Manak, S. A. Morrow, A. Yegneswaran, Gerard Gilfoyle, M. Eckhause, C. Djalali, J. P. Cummings, Susan Taylor, A. K. Opper, P. Dragovitsch, H. Egiyan, H. Denizli, Laird Kramer, R. A. Miskimen, M. Kossov, P. Ambrozewicz, Rakhsha Nasseripour, R. A. Schumacher, S. Niccolai, A. V. Skabelin, Y. Kuang, D. Branford, L. Ciciani, G. S. Adams, K. S. Egiyan, M. Mirazita, J. M. Laget, S. Stepanyan, Sylvain Bouchigny, L. C. Smith, J. Hardie, S. J. Gaff, S. Simionatto, Alexei V. Klimenko, C. S. Whisnant, E. Polli, K. Joo, B. S. Ishkhanov, L. Todor, D. Protopopescu, K. Mikhailov, P. Rossi, Barry Ritchie, K. L. Giovanetti, B. Asavapibhop, S. Pozdniakov, M. Garçon, A. Cazes, M. U. Mozer, M. Guidal, C. Cetina, E. DeSanctis, W. K. Brooks, B. B. Niczyporuk, A.V. Stavinsky, Jing Zhao, M. Spraker, Larry Weinstein, Michael Vineyard, C. I O Gordon, Z. L. Zhou, G. Niculescu, K. V. Dharmawardane, D. J. Tedeschi, Dinko Pocanic, S. E. Kuhn, N. Pivnyuk, J. Napolitano, M. Holtrop, U. Thoma, E. Anciant, Ji Li, J. R. Calarco, L. Morand, K. A. Griffioen, J. H. Kelley, G. V. O'Rielly, T. A. Forest, C. Tur, O. P. Dzyubak, R. A. Niyazov, K. Livingston, M. Khandaker, J. Lachniet, D. G. Jenkins, K. Sabourov, M. D. Mestayer, K. Paschke, D. Rowntree, P. Corvisiero, V. Gyurjyan, Elton Smith, Daniel S. Carman, S. Mehrabyan, S. McAleer, D. Doughty, D. Heddle, S. Boiarinov, Terry Mart, D. I. Sober, Avraham Klein, R. J. Feuerbach, J. R. Ficenec, M. M. Ito, B. M. Preedom, G. Audit, C. E. Hyde-Wright, J. W C McNabb, G. E. Dodge, M. Anghinolfi, R. S. Hakobyan, P. Stoler, James Mueller, J. P. Santoro, J. W. Price, P. D. Rubin, H. Bagdasaryan, J. Hu, E. N. Golovach, G. A. Peterson, S. O. Nelson, P. V. Degtyarenko, K. Hicks, Y. G. Sharabian, M. Bektasoglu, K. Wang, C. Salgado, M. Battaglieri, M. Guillo, S. Barrow, I. Niculescu, D. Lawrence, R. Bradford, B. A. Mecking, Hall Crannell, C. Marchand, Kwangsoo Kim, M. Ripani, G. Riccardi, Cynthia Marie Hadjidakis, Jens H. Kuhn, C. Butuceanu, Michael Dugger, Nicola Bianchi, H. O. Funsten, W. Kim, M. Bellis, K. Park, J. S. McCarthy, K. Y. Kim, A. Longhi, R. Clark, L. Y. Murphy, A. Empl, O. Pogorelko, K. Lukashin, G. Ricco, Philip L. Cole, M. Osipenko, E. Wolin, F. Sabatié, Moshe Gai, F. W. Hersman, Friedrich Klein, K. Beard, M. Nozar, R. S. Hicks, Brian Raue, Kalvir S. Dhuga, Patrick Girard, J. Shaw, Michael Wood, Steven M. Grimes, G. Gavalian, V. Mokeev, J. P. Ball, Federico Ronchetti, Roy Thompson, Y. Prok, V. S. Serov, L. C. Dennis, B. E. Bonner, H. Avakian, W. J. Briscoe, E. Pasyuk, P. Eugenio, M. Taiuti, S. A. Dytman, J. J. Melone, D. G. Crabb, Volker D. Burkert, A. S. Biselli, G. S. Mutchler, L. M. Qin, R. DeVita, Shalev Gilad, M. Klusman, B. Carnahan, P. Heimberg, J. D. Kellie, and Thierry Auger

Subjects
Physics, Quark, Particle physics, Spectrometer, Spins, Nuclear Theory, Quark model, Hyperon, General Physics and Astronomy, Creation and annihilation operators, Particle accelerator, Polarization (waves), law.invention, Nuclear physics, law, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The first measurements of the transferred polarization for the exclusive (e) over right arrow p --> e'K+(U) over right arrow reaction have been performed at Jefferson Laboratory using the CLAS spectrometer. A 2.567 GeV beam was used to measure the hyperon polarization over Q(2) from 0.3 to 1.5 (GeV/c)(2), W from 1.6 to 2.15 GeV, and over the full K+ center-of-mass angular range. Comparison with predictions of hadrodynamic models indicates strong sensitivity to the underlying resonance contributions. A nonrelativistic quark-model interpretation of our data suggests that the s (s) over bar quark pair is produced with spins predominantly antialigned. Implications for the validity of the most widely used quark-pair creation operator are discussed.

Published
2003

8. Publisher’s Note:ηPhotoproduction on the Proton for Photon Energies from 0.75 to 1.95 GeV [Phys. Rev. Lett.89, 222002 (2002)]

Author

V. V. Frolov, D. Doughty, R. A. Niyazov, John T. O'Brien, D. Heddle, Barry Ritchie, S. A. Morrow, P. Rubin, M. Eckhause, C. Djalali, P. Dragovitsch, K. A. Griffioen, G. E. Dodge, M. Lucas, P. Corvisiero, D. Hancock, E. S. Smith, Sylvain Bouchigny, P. Rossi, P. V. Degtyarenko, S. Niccolai, Carlos A. Salgado, L. Elouadrhiri, G. Ricco, J. Hardie, K. S. Egiyan, Baile Zhang, R. C. Minehart, C. A. Meyer, G. S. Mutchler, V. Koubarovski, K. Mikhailov, G. Gavalian, A. K. Opper, I. Niculescu, M. M. Ito, I. I. Strakovsky, A.V. Stavinsky, D. Lawrence, M. Spraker, C. Cetina, H. Egiyan, G. V. O'Rielly, E. Wolin, Michael Vineyard, J. P. Cummings, D. P. Weygand, L. Farhi, Y. Kuang, D. J. Tedeschi, C. S. Whisnant, D. G. Jenkins, K. Sabourov, G. P. Capitani, E. Polli, William Brooks, G. S. Adams, R. DeVita, J. W C McNabb, Ji Li, H. Denizli, Hall Crannell, M. U. Mozer, P. Heimberg, M. Witkowski, K. V. Dharmawardane, A. Coleman, P. L. Cole, Cynthia Marie Hadjidakis, Andreas Klein, J. R. Ficenec, S. McAleer, J. D. Kellie, P. Stoler, J. Lachniet, H. R. Weller, M. Kossov, J. R. Calarco, C. Marchand, M. D. Mestayer, J. J. Manak, D. Rowntree, M. Anghinolfi, James Mueller, Michael Dugger, J. Connelly, A. V. Skabelin, K. S. Dhuga, D. Pogorelko, H. O. Funsten, S. O. Nelson, Y. G. Sharabian, Frank Klein, L. C. Smith, Rakhsha Nasseripour, S. J. Gaff, K. Hicks, M. Sanzone-Arenhovel, R. A. Schumacher, S. Boiarinov, B. B. Niczyporuk, B. M. Preedom, S. Strauch, S. A. Philips, W. Kim, N. Pivnyuk, C. I O Gordon, K. Lukashin, J. Napolitano, Moshe Gai, Dinko Pocanic, M. Battaglieri, Shalev Gilad, M. Nozar, S. E. Kuhn, L. Morand, T. A. Forest, B. Carnahan, F. Sabatié, K. L. Giovanetti, B. Asavapibhop, J. H. Kelley, Stephen Taylor, J. P. Ball, Y. Prok, Patrick Girard, R. Bradford, B. A. Mecking, Larry Weinstein, Gerald Feldman, J. Shaw, S. Stepanyan, D. S. Carman, Jens H. Kuhn, A. Longhi, E. Anciant, K. Wang, U. Thoma, Nicola Bianchi, Thierry Auger, Michael Wood, R. S. Hicks, Brian Raue, K. Livingston, V. S. Serov, L. C. Dennis, M. Khandaker, G. Audit, M. Ripani, M. Guillo, C. E. Hyde-Wright, B. L. Berman, L. M. Qin, H. Avakian, R. J. Feuerbach, K. Beard, M. Klusman, D. G. Crabb, G. A. Peterson, W. Major, M. Bektasoglu, S. Barrow, M. Guidal, G. Niculescu, W. J. Briscoe, E. Pasyuk, Federico Ronchetti, M. Holtrop, Thomas E. Smith, S. A. Dytman, L. Todor, J. S. McCarthy, M. Bellis, D. Protopopescu, L. Y. Murphy, S. Pozdniakov, S. Mehrabyan, Z. L. Zhou, R. Clark, A. Shafi, G. Riccardi, J. P. Santoro, Roy Thompson, Jing Zhao, M. Taiuti, V. Sapunenko, Valeria Muccifora, Gerard Gilfoyle, F. W. Hersman, R. A. Miskimen, D. Branford, M. Mirazita, J. M. Laget, Laird Kramer, R. Fatemi, A. V. Vlassov, K. Park, D. I. Sober, Volker D. Burkert, A. S. Biselli, L. Guo, M. Ungaro, K. Joo, J. Yun, D. Cords, A. Yegneswaran, E. DeSanctis, V. Gyurjyan, H. Bagdasaryan, and J. W. Price

Subjects
Physics, Nuclear physics, Photon, Proton, General Physics and Astronomy
Published
2002

9. Eta photoproduction on the proton for photon energies from 0.75 to 1.95 GeV

Author

R. Fatemi, K. S. Egiyan, V. Koubarovski, A. V. Vlassov, B. Carnahan, F. Sabatié, K. Mikhailov, C. Marchand, M. Taiuti, Thierry Auger, S. A. Morrow, C. Djalali, W. J. Briscoe, E. Pasyuk, M. Lucas, G. Ricco, S. A. Dytman, J. J. Manak, C. E. Hyde-Wright, A.V. Stavinsky, H. R. Weller, Patrick Girard, A. V. Skabelin, G. S. Mutchler, S. Stepanyan, Sylvain Bouchigny, J. Shaw, D. J. Tedeschi, S. McAleer, Philip L. Cole, Moshe Gai, R. A. Niyazov, Michael Wood, B. M. Preedom, V. S. Serov, E. Anciant, J. S. McCarthy, J. P. Santoro, A. K. Opper, M. Sanzone-Arenhovel, John T. O'Brien, D. I. Sober, F. W. Hersman, B. B. Niczyporuk, M. U. Mozer, M. Witkowski, Bernhard Mecking, K. V. Dharmawardane, B. L. Berman, Shalev Gilad, P. Rossi, W. Kim, M. Bellis, K. Park, M. Guillo, Friedrich Klein, P. Corvisiero, H. Egiyan, S. Mehrabyan, M. Khandaker, Gerald Feldman, N. Pivnyuk, J. P. Cummings, J. Napolitano, P. Dragovitsch, M. Ripani, R. S. Hicks, Brian Raue, A. Longhi, R. Clark, Roy Thompson, K. Wang, S. Strauch, C. Salgado, O. Pogorelko, D. Protopopescu, H. Funsten, M. Kossov, K. Lukashin, D. Doughty, D. Heddle, M. Klusman, C. S. Whisnant, S. Pozdniakov, L.C. Dennis, J. R. Calarco, M. M. Ito, L. Todor, J. W. Price, S. Niccolai, J. Hardie, R. J. Feuerbach, Rakhsha Nasseripour, P. Stoler, C. Cetina, S. O. Nelson, R. A. Miskimen, Volker D. Burkert, L. C. Smith, A. S. Biselli, K. Beard, S. J. Gaff, Michael Vineyard, K. A. Griffioen, Kalvir S. Dhuga, L. Y. Murphy, M. Battaglieri, G. Riccardi, R. DeVita, J. W C McNabb, E. Wolin, F. Ronchetti, V. Frolov, Ji Li, G. Gavalian, R. Bradford, Cynthia Marie Hadjidakis, D. Branford, J. Ficenec, J. P. Ball, Y. Prok, P. Heimberg, M. Eckhause, Z. L. Zhou, A. Shafi, G. V. O'Rielly, M. D. Mestayer, Michael Dugger, D. G. Jenkins, K. Sabourov, K. L. Giovanetti, B. Asavapibhop, D. G. Crabb, S. Boiarinov, L. Elouadrhiri, Larry Weinstein, M. Spraker, M. Mirazita, J. M. Laget, J. D. Kellie, I. I. Strakovsky, K. Livingston, Baile Zhang, W. K. Brooks, L. M. Qin, Laird Kramer, L. Farhi, Harut Avakian, V. Sapunenko, Valeria Muccifora, Y. Kuang, G. A. Peterson, E. Polli, Dinko Pocanic, S. Barrow, S. E. Kuhn, J. H. Kelley, Gerard Gilfoyle, Elton Smith, M. Anghinolfi, James Mueller, P. D. Rubin, Y. G. Sharabian, Jens H. Kuhn, Jing Zhao, Nicola Bianchi, Barry Ritchie, R. C. Minehart, C. A. Meyer, S. A. Philips, H. Denizli, K. Hicks, Daniel S. Carman, J. Connelly, G. Audit, M. Bektasoglu, M. Nozar, M. Guidal, G. Niculescu, M. Holtrop, Thomas E. Smith, Hall Crannell, G. E. Dodge, P. V. Degtyarenko, I. Niculescu, D. Lawrence, L. Morand, R. A. Schumacher, C. I O Gordon, T. A. Forest, Avraham Klein, V. Gyurjyan, H. Bagdasaryan, D. Hancock, W. Major, E. DeSanctis, G. P. Capitani, L. Guo, M. Ungaro, J. Lachniet, D. Rowntree, S. Taylor, G. S. Adams, K. Joo, J. Yun, A. Coleman, D. Cords, A. Yegneswaran, U. Thoma, and D. P. Weygand

Subjects
Physics, Particle physics, Photon, Meson, Proton, media_common.quotation_subject, Quark model, General Physics and Astronomy, Constituent quark, Resonance (particle physics), Asymmetry, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Beam (structure), media_common
Abstract

Differential cross sections for gammap-->etap have been measured with tagged real photons for incident photon energies from 0.75 to 1.95 GeV. Mesons were identified by missing mass reconstruction using kinematical information for protons scattered in the production process. The data provide the first extensive angular distribution measurements for the process above W=1.75 GeV. Comparison with preliminary results from a constituent quark model support the suggestion that a third S11 resonance with mass approximately 1.8 GeV couples to the etaN channel.

Published
2002

10. Erratum: First Measurement of the Double Spin Asymmetry ine→p→→e′π+nin the Resonance Region [Phys. Rev. Lett. 88, 082001 (2002)]

Author

R. De Vita, M. Anghinolfi, V. D. Burkert, G. E. Dodge, R. Minehart, M. Taiuti, H. Weller, G. Adams, M. J. Amaryan, E. Anciant, D. S. Armstrong, B. Asavapibhop, G. Asryan, G. Audit, T. Auger, H. Avakian, H. Bagdasaryan, J. P. Ball, S. Barrow, M. Battaglieri, K. Beard, M. Bektasoglu, N. Bianchi, A. S. Biselli, S. Boiarinov, B. E. Bonner, P. Bosted, S. Bouchigny, D. Branford, W. K. Brooks, S. Bueltmann, J. R. Calarco, G. P. Capitani, D. S. Carman, B. Carnahan, A. Cazes, L. Ciciani, P. L. Cole, A. Coleman, J. Connelly, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. P. Cummings, E. De Sanctis, P. V. Degtyarenko, R. Demirchyan, H. Denizli, L. Dennis, K. V. Dharmawardane, K. S. Dhuga, C. Djalali, D. Doughty, P. Dragovitsch, M. Dugger, S. Dytman, M. Eckhause, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, A. Empl, L. Farhi, R. Fatemi, R. J. Feuerbach, J. Ficenec, T. A. Forest, V. Frolov, H. Funsten, S. J. Gaff, M. Gai, M. Garçon, G. Gavalian, S. Gilad, G. P. Gilfoyle, K. L. Giovanetti, P. Girard, E. Golovatch, K. Griffioen, M. Guidal, M. Guillo, V. Gyurjyan, C. Hadjidakis, D. Hancock, J. Hardie, D. Heddle, P. Heimberg, F. W. Hersman, K. Hicks, R. S. Hicks, M. Holtrop, J. Hu, C. E. Hyde-Wright, B. S. Ishkanov, M. M. Ito, D. Jenkins, K. Joo, J. H. Kelley, J. D. Kellie, M. Khandaker, K. Y. Kim, K. Kim, W. Kim, A. Klein, F. J. Klein, M. Klusman, M. Kossov, L. H. Kramer, Y. Kuang, J. Kuhn, S. E. Kuhn, J. Lachniet, J. M. Laget, D. Lawrence, Ji Li, K. Livingston, A. Longhi, K. Loukachine, M. Lucas, W. Major, J. J. Manak, C. Marchand, S. McAleer, J. McCarthy, J. W. C. McNabb, B. A. Mecking, M. D. Mestayer, C. A. Meyer, K. Mikhailov, M. Mirazita, R. Miskimen, V. Mokeev, V. Muccifora, J. Mueller, G. S. Mutchler, J. Napolitano, S. O. Nelson, G. Niculescu, I. Niculescu, B. B. Niczyporuk, R. A. Niyazov, A. K. Opper, G. V. O'Rielly, M. Osipenko, K. Park, E. Pasyuk, G. Peterson, S. A. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, S. Pozdniakov, B. M. Preedom, J. W. Price, Y. Prok, D. Protopopescu, L. M. Qin, B. A. Raue, A. R. Reolon, G. Riccardi, G. Ricco, M. Ripani, B. G. Ritchie, S. Rock, F. Ronchetti, P. Rossi, D. Rowntree, P. D. Rubin, F. Sabatié, K. Sabourov, C. Salgado, V. Sapunenko, M. Sargsyan, R. A. Schumacher, V. S. Serov, A. Shafi, Y. G. Sharabian, J. Shaw, A. V. Skabelin, E. S. Smith, T. Smith, L. C. Smith, D. I. Sober, L. Sorrell, M. Spraker, A. Stavinsky, S. Stepanyan, P. Stoler, I. I. Strakovsky, S. Taylor, D. J. Tedeschi, R. Thompson, L. Todor, M. Ungaro, M. F. Vineyard, A. V. Vlassov, K. Wang, L. B. Weinstein, A. Weisberg, D. P. Weygand, C. S. Whisnant, E. Wolin, A. Yegneswaran, J. Yun, B. Zhang, J. Zhao, and Z. Zhou

Subjects
Physics, media_common.quotation_subject, Pi, General Physics and Astronomy, Resonance, Angular dependence, Atomic physics, Spin (physics), Asymmetry, Helicity, media_common
Published
2002

11. First Measurement of the Double Spin Asymmetry ine→p→→e′π+nin the Resonance Region

Author

Elton Smith, B. S. Ishkanov, E. Golovatch, M. Ungaro, V. Frolov, M. J. Amaryan, D. S. Armstrong, J. R. Calarco, S. A. Philips, J. Ficenec, L. Ciciani, R. A. Schumacher, Shalev Gilad, R. A. Demirchyan, L. C. Dennis, B. E. Bonner, M. Anghinolfi, James Mueller, T. A. Forest, S. Stepanyan, Avraham Klein, H. Avakian, A.V. Stavinsky, P. D. Rubin, Hall Crannell, Y. G. Sharabian, K. L. Giovanetti, B. Asavapibhop, L. Elouadrhiri, M. Osipenko, M. Klusman, G. E. Dodge, B. B. Niczyporuk, D. J. Tedeschi, K. Beard, Kalvir S. Dhuga, J. P. Cummings, Dinko Pocanic, R. C. Minehart, C. A. Meyer, M. Taiuti, N. Pivnyuk, J. Napolitano, R. J. Feuerbach, J. Lachniet, D. Rowntree, J. Yun, D. Cords, A. Yegneswaran, P. V. Degtyarenko, K. Kim, K. Loukachine, I. Niculescu, D. Lawrence, G. S. Adams, K. Joo, A. Cazes, Bernhard Mecking, M. Guidal, G. Niculescu, E. Pasyuk, C. Marchand, Larry Weinstein, S. A. Dytman, I. I. Strakovsky, G. Gavalian, J. S. McCarthy, K. V. Dharmawardane, R. De Vita, G. V. O'Rielly, G. Asryan, M. Holtrop, Thomas E. Smith, K. Park, M. Kossov, S. E. Kuhn, D. P. Weygand, E. Anciant, R. A. Niyazov, B. Carnahan, J. H. Kelley, D. G. Jenkins, M. Battaglieri, W. K. Brooks, A. K. Opper, A. Empl, O. Pogorelko, P. Dragovitsch, F. Sabatié, Daniel S. Carman, Sylvain Bouchigny, K. Sabourov, Federico Ronchetti, L. M. Qin, L. C. Smith, M. Khandaker, S. J. Gaff, G. Riccardi, J. W C McNabb, E. De Sanctis, P. Corvisiero, Victor Mokeev, C. E. Hyde-Wright, G. Audit, L. Sorrell, Thierry Auger, P. Rossi, Barry Ritchie, Baile Zhang, A. Weisberg, A. R. Reolon, D. Protopopescu, J. Hardie, M. Ripani, Michael Vineyard, Patrick Girard, J. Shaw, S. Pozdniakov, M. Garçon, D. Doughty, M. Bektasoglu, S. McAleer, V. Gyurjyan, C. Djalali, W. Kim, Cynthia Marie Hadjidakis, P. Stoler, H. Denizli, D. Heddle, M. Lucas, V. S. Serov, F. W. Hersman, W. Major, K. A. Griffioen, Y. Kuang, Michael Dugger, S. O. Nelson, Z. L. Zhou, H. Bagdasaryan, A. Shafi, H. Egiyan, K. Hicks, Roy Thompson, D. I. Sober, D. Hancock, E. Polli, J. Connelly, A. Coleman, Stephen M. Rock, K. S. Egiyan, M. Guillo, G. Ricco, Ji Li, C. S. Whisnant, A. Longhi, E. Wolin, K. Mikhailov, H. Funsten, P. Bosted, P. Heimberg, J. Hu, J. P. Ball, Y. Prok, J. W. Price, M. Eckhause, Philip L. Cole, M. D. Mestayer, K. Y. Kim, M. Sargsyan, J. D. Kellie, D. G. Crabb, M. Spraker, G. P. Capitani, Nicola Bianchi, K. Livingston, S. Taylor, S. Bueltmann, G. A. Peterson, S. Barrow, R. Fatemi, A. V. Vlassov, S. Boiarinov, B. M. Preedom, A. V. Skabelin, G. S. Mutchler, Moshe Gai, H. R. Weller, Friedrich Klein, R. S. Hicks, K. Wang, Brian Raue, C. Salgado, J. J. Manak, M. M. Ito, L. Todor, Laird Kramer, Jing Zhao, L. Farhi, V. Sapunenko, Valeria Muccifora, Volker D. Burkert, A. S. Biselli, Gerard Gilfoyle, R. A. Miskimen, D. Branford, M. Mirazita, and J. M. Laget

Subjects
Physics, Nuclear physics, media_common.quotation_subject, Cathode ray, General Physics and Astronomy, Resonance, High Energy Physics::Experiment, Nuclear Experiment, Spin (physics), Asymmetry, Helicity, media_common
Abstract

The double spin asymmetry in the (-->)e(-->)p --> e(prime)pi(+)n reaction has been measured for the first time in the resonance region for four-momentum transfer Q2 = 0.35-1.5 GeV(2). Data were taken at Jefferson Lab with the CLAS detector using a 2.6 GeV polarized electron beam incident on a polarized solid NH3 target. Comparison with predictions of phenomenological models shows strong sensitivity to resonance contributions. Helicity-1/2 transitions are found to be dominant in the second and third resonance regions. The measured asymmetry is consistent with a faster rise with Q(2) of the helicity asymmetry A1 for the F(15)(1680) resonance than expected from the analysis of the unpolarized data.

Published
2002

12. Photoproduction of theρ0Meson on the Proton at Large Momentum Transfer

Author

V. Frolov, M. J. Amaryan, V. Mokeev, A. Cazes, J. P. Cummings, R. De Vita, P. Dragovitsch, Roy Thompson, R. Demirchyan, K. V. Dharmawardane, G. Asryan, R. A. Niyazov, M. Kossov, Volker D. Burkert, A. S. Biselli, J. Hardie, K. L. Giovanetti, B. Asavapibhop, R. A. Miskimen, John T. O'Brien, M. Spraker, Larry Weinstein, Laird Kramer, G. S. Adams, B. L. Berman, P. Corvisiero, G. Riccardi, M. Taiuti, M. Battaglieri, Susan Taylor, L. M. Qin, K. Joo, K. Beard, E. Anciant, L. Todor, D. Protopopescu, Kalvir S. Dhuga, K. S. Egiyan, B. A. Mecking, J. R. Calarco, A.V. Stavinsky, M. Klusman, M. M. Ito, H. Egiyan, W. Kim, R. W. Major, E. Wolin, J. W C McNabb, A. P. Freyberger, K. Mikhailov, D. J. Tedeschi, M. Khandaker, D. Branford, K. A. Griffioen, M. Mirazita, Z. L. Zhou, A. Shafi, Dinko Pocanic, L. Farhi, M. Sanzone-Arenhovel, Federico Ronchetti, J. M. Laget, B. B. Niczyporuk, D. Doughty, Shalev Gilad, B. Carnahan, G. Ricco, D. G. Crabb, N. Pivnyuk, D. Heddle, C. S. Whisnant, S. E. Kuhn, J. Napolitano, P. Stoler, A. Coleman, Philip L. Cole, H. R. Weller, Thierry Auger, A. Weisberg, A. R. Reolon, Moshe Gai, K. Sabourov, S. O. Nelson, J. Shaw, K. Hicks, M. Eckhause, P. Rossi, C. Djalali, Michael Wood, M. Lucas, R. J. Feuerbach, Friedrich Klein, R. S. Hicks, Brian Raue, V. S. Serov, V. Sapunenko, Valeria Muccifora, Michael Dugger, J. H. Kelley, F. W. Hersman, H. O. Funsten, M. Guillo, S. McAleer, J. S. McCarthy, A. V. Vlassov, Gerard Gilfoyle, O. Pogorelko, K. Lukashin, L. C. Dennis, L. C. Smith, S. J. Gaff, Nicola Bianchi, H. Avakian, L. Elouadrhiri, G. S. Mutchler, Jing Zhao, W. J. Briscoe, M. Ripani, S. A. Dytman, Elton Smith, E. N. Golovach, G. A. Peterson, W. K. Brooks, S. Barrow, J. R. Ficenec, D. S. Armstrong, M. Anghinolfi, J. Yun, D. Cords, James Mueller, A. Yegneswaran, P. D. Rubin, Y. G. Sharabian, E. DeSanctis, Baile Zhang, J. J. Manak, A. K. Opper, Y. Kuang, V. Gyurjyan, E. Polli, D. I. Sober, J. W. Price, D. Hancock, H. Denizli, A. V. Skabelin, R. C. Minehart, C. A. Meyer, D. P. Weygand, Barry Ritchie, Daniel S. Carman, G. Audit, C. E. Hyde-Wright, M. Bektasoglu, S. A. Philips, M. Guidal, M. D. Mestayer, M. Holtrop, Thomas E. Smith, S. Boiarinov, R. A. Schumacher, T. A. Forest, S. Stepanyan, Avraham Klein, Hall Crannell, C. Cetina, C. Marchand, G. E. Dodge, Michael Vineyard, B. M. Preedom, P. V. Degtyarenko, D. Lawrence, G. P. Capitani, C. Salgado, and D. Rowntree

Subjects
Nuclear physics, Physics, Proton, Meson, Momentum transfer, General Physics and Astronomy
Published
2001

13. Observation of Exclusive Deeply Virtual Compton Scattering in Polarized Electron Beam Asymmetry Measurements

Author

K.H. Hicks, M. M. Ito, K. Mikhailov, Laird Kramer, D. J. Tedeschi, M. Guidal, C. Marchand, G. Niculescu, Daijin Kim, V. Sapunenko, M. Holtrop, D. Dore, Patrick Girard, A. Shafi, M. Klusman, L. Yanik, Sylvain Bouchigny, Daniel S. Carman, J. P. Cummings, L. Murphy, R. De Vita, V. S. Serov, A. Yegneswaran, A. Coleman, Gerard Gilfoyle, G. Audit, G. Gavalian, W. Kim, V. Muccifora, K. Park, M. Ripani, S. Whisnant, B. M. Preedom, Robert E. Welsh, I. Popa, K. A. Griffioen, R. A. Schumacher, E. Anciant, P.Y. Bertin, M. Bektasoglu, R. C. Minehart, E. De Sanctis, Elton Smith, G. Feldman, Volker D. Burkert, C. A. Meyer, A. S. Biselli, P. Dragovitsch, G. V. O'Rielly, L. Elouadrhiri, J. R. Calarco, J. Yun, D. Cords, H. Egiyan, E. Polli, Cynthia Marie Hadjidakis, A. K. Opper, S. A. Philips, A. Empl, O. Pogorelko, S. O. Nelson, S. Niccolai, D. Rowntree, M. Battaglieri, D. I. Sober, W. K. Brooks, K. Sabourov, A. Longhi, Jing Zhao, L. C. Dennis, B. E. Bonner, J. Hardie, E. Pasyuk, Igor Strakovsky, H. Avakian, L. M. Qin, M. Anghinolfi, James Mueller, L. C. Maximon, M. Khandaker, P. Heimberg, N. Pivnyuk, Pavel Degtiarenko, S. McAleer, R. Fatemi, B.L. Berman, Roy Thompson, A.V. Stavinsky, T. A. Forest, G. A. Peterson, P. D. Rubin, A. V. Vlassov, J. Ficenec, F. Ronchetti, L. Ciciani, R. J. Feuerbach, Mestayer, S. A. Dytman, E. Wolin, S. Simionatto, Avraham Klein, Shalev Gilad, K. Wang, C. Salgado, Dinko Pocanic, K. Beard, Bernhard Mecking, K. V. Dharmawardane, H. Funsten, K. L. Giovanetti, B. Asavapibhop, J. W. Price, R. Miskimen, J. P. Ball, K. S. Dhuga, P. Stoler, M. Eckhause, Larry Weinstein, D. Doughty, S. E. Kuhn, Charles Hyde, S. Barrow, P. Rossi, K. Lukashin, Hall Crannell, G. Riccardi, D. Heddle, J. S. McCarthy, J. H. Kelley, J. J. Manak, M. Guillo, J. W C McNabb, Yu.G. Sharabian, David A. Jenkins, D. G. Crabb, K. Y. Kim, S. Stepanyan, M. Taiuti, John T. O'Brien, M. Kossov, D. Protopopescu, C. Djalali, Baile Zhang, J. Hu, Barry Ritchie, Kevin Fissum, S. Pozdniakov, M. Garçon, D. Branford, C. Cetina, G. E. Dodge, A.R. Reolon, Z. L. Zhou, M. Mirazita, J. M. Laget, K. Kim, H. R. Weller, J. Shaw, P. Corvisiero, I. Niculescu, D. Lawrence, Jim Napolitano, B. A. Raue, L. Morand, F. W. Hersman, H. Denizli, K. S. Egiyan, Michael Vineyard, V. Gyurjyan, Nicola Bianchi, R. Suleiman, A. V. Skabelin, G. S. Mutchler, S. Boiarinov, R. A. Niyazov, S. Taylor, G. S. Adams, B. Carnahan, F. Sabatié, K. Joo, Thierry Auger, W.J. Briscoe, L. Todor, L. C. Smith, S. J. Gaff, D. P. Weygand, G. Ricco, Philip L. Cole, Moshe Gai, Friedrich Klein, R. S. Hicks, and A. P. Freyberger

Subjects
Quantum chromodynamics, Physics, Elastic scattering, Scattering, media_common.quotation_subject, Compton scattering, General Physics and Astronomy, Asymmetry, Nuclear physics, Amplitude, High Energy Physics::Experiment, Nuclear Experiment, Beam (structure), Spin-½, media_common
Abstract

We report the first results of the beam spin asymmetry measured in the reaction e + p -> e + p + gamma at a beam energy of 4.25 GeV. A large asymmetry with a sin(phi) modulation is observed, as predicted for the interference term of Deeply Virtual Compton Scattering and the Bethe-Heitler process. The amplitude of this modulation is alpha = 0.202 +/- 0.028. In leading-order and leading-twist pQCD, the alpha is directly proportional to the imaginary part of the DVCS amplitude.

Published
2001

14. Fragment Kinetic Energies and Modes of Fragment Formation

Author

B. Ocker, A. Schüttauf, W. Trautmann, M. Schnittker, V. Maddalena, Giuseppe Verde, A. Trzcinski, Gerd Joachim Kunde, A. Wörner, Giorgio Riccobene, Francesco Romano, D. Gourio, B. Zwieglinski, Giuseppina Raciti, I. Iori, C. Sfienti, S. Fritz, S. J. Gaff-Ejakov, Hongfei Xi, F. Petruzzelli, Cornelius Schwarz, T. Odeh, J. Pochodzalla, W. D. Kunze, U. Kleinevoß, T. Möhlenkamp, A. Saija, U. Lynen, W. F. J. Müller, A. Moroni, C. Nociforo, M. Mahi, W. Seidel, M.L. Begemann-Blaich, G. Imme, V. Serfling, C. Groß, and R. Bassini

Subjects
Physics, HEAVY-ION COLLISIONS, HE-3+ AG-NAT, STATISTICAL MULTIFRAGMENTATION, SPECTATOR FRAGMENTATION, AU-197 REACTIONS, PROTON-NUCLEUS, GOLD, TEMPERATURES, CLUSTERS, MATTER, Nuclear Theory, Degrees of freedom (physics and chemistry), Evaporation, General Physics and Astronomy, FOS: Physical sciences, Breakup, Kinetic energy, Spectral line, Particle, Atomic physics, Nuclear Experiment (nucl-ex), Nucleon, Nuclear Experiment, Fermi Gamma-ray Space Telescope
Abstract

Kinetic energies of light fragments A, 11 pages, with 4 included figures; Accepted by Phys. Rev. Lett.; Also available from http://www-kp3.gsi.de/www/kp3/aladin_publications.html

Published
2000
Full Text
View/download PDF

15. Understanding proton emission in central heavy-ion collisions

Author

Eugene Gualtieri, A. M. Vander Molen, T. Li, Sherry Yennello, C. P. Montoya, S. J. Gaff, Graham F. Peaslee, T. Glasmacher, C. K. Gelbke, Gary Westfall, M. B. Tsang, G. J. Kunde, R. Pak, R. Lacey, W. J. Llope, L. Martin, M. A. Lisa, C. Schwarz, S. Hannuschke, W. G. Lynch, M. J. Huang, F. Daffin, N. T. B. Stone, Scott Pratt, J. Yee, Wolfgang Bauer, and D. O. Handzy

Subjects
Physics, Nuclear reaction, Baryon, Nuclear physics, Hadron, General Physics and Astronomy, Elementary particle, Fermion, Atomic physics, Proton emission, Nucleon, Charged particle, Nuclear Physics
Abstract

Two-proton correlation functions for central collisions of {sup 36}Ar+{sup 45}Sc at {ital E}/{ital A}=80, 120, and 160 MeV are compared to calculations with the Boltzmann-Uehling-Uhlenbeck (BUU) transport model. Agreement is found at {ital E}/{ital A}=80MeV, but the model predicts too large correlations at {ital E}/{ital A}=120 and 160 MeV. The discrepancy may be due to delayed emission of protons from particle-unstable states not modeled in BUU. {copyright} {ital 1995} {ital The} {ital American} {ital Physical} {ital Society}.

Published
1995

16. Observation of an Exotic Baryon with S = +1 in Photoproduction from the Proton

Author

L. C. Smith, S. J. Gaff, K. A. Griffioen, Elton Smith, J. R. Ficenec, R. A. Schumacher, G. Gavalian, V. Mokeev, M. Bellis, K. Park, M. Anghinolfi, B. L. Berman, L. M. Qin, James Mueller, P. D. Rubin, Y. G. Sharabian, C. I O Gordon, V. P. Kubarovsky, R. J. Feuerbach, J. Kuhn, Dinko Pocanic, S. E. Kuhn, J. H. Kelley, C. Tur, Roy Thompson, A. Empl, O. Pogorelko, K. Lukashin, M. Klusman, L. Morand, T. A. Forest, S. Stepanyan, E. De Sanctis, R. C. Minehart, C. A. Meyer, A. K. Opper, Shifeng Chen, D. I. Sober, P. Eugenio, M. Taiuti, L. C. Dennis, H. Avakian, P. Heimberg, B. M. Preedom, E. Polli, W. Kim, Daniel S. Carman, G. Audit, J. P. Santoro, P. Stoler, B. Carnahan, F. Sabatié, J. Hu, J. J. Melone, K. Wang, C. Salgado, D. P. Weygand, B. B. Niczyporuk, R. Fatemi, E. Wolin, G. E. Dodge, J. P. Cummings, H. Denizli, N. Pivnyuk, J. Napolitano, A. Longhi, Thierry Auger, A. V. Vlassov, S. O. Nelson, Ji Li, W. J. Briscoe, E. Pasyuk, M. D. Mestayer, M. Kossov, K. Hicks, J. R. Calarco, J. P. Ball, Y. Prok, S. A. Dytman, Susan Taylor, P. V. Degtyarenko, M. Sargsyan, Cynthia Marie Hadjidakis, S. Strauch, J. Connelly, A. V. Skabelin, S. Boiarinov, D. G. Crabb, Michael Dugger, Rakhsha Nasseripour, Alexei V. Klimenko, A. Weisberg, H. O. Funsten, K. S. Egiyan, R. DeVita, J. W C McNabb, M. Osipenko, C. Cetina, K. Mikhailov, Michael Vineyard, I. Niculescu, D. Lawrence, M. Guillo, Patrick Girard, C. S. Whisnant, J. Shaw, V. Gyurjyan, M. Nozar, Michael Wood, Barry Ritchie, K. Beard, M. U. Mozer, S. Mehrabyan, R. W. Major, L. Elouadrhiri, S. A. Morrow, C. Djalali, V. S. Serov, L. Farhi, J. J. Manak, P. Ambrozewicz, Sylvain Bouchigny, K. V. Dharmawardane, I. I. Strakovsky, P. Rossi, Kwangsoo Kim, G. Riccardi, G. S. Mutchler, M. Guidal, G. V. O'Rielly, G. Niculescu, O. P. Dzyubak, R. A. Niyazov, C. Butuceanu, H. Bagdasaryan, Hall Crannell, John T. O'Brien, N. Benmouna, C. Marchand, M. Ripani, D. Hancock, M. Battaglieri, P. Corvisiero, M. Holtrop, Thomas E. Smith, M. Ungaro, W. K. Brooks, R. Bradford, B. A. Mecking, D. G. Jenkins, K. Sabourov, K. Joo, J. Yun, D. Cords, A. Yegneswaran, G. S. Adams, S. McAleer, J. Langheinrich, S. A. Philips, U. Thoma, J. W. Price, M. M. Ito, Laird Kramer, E. Anciant, M. Bektasoglu, M. Khandaker, D. Doughty, F. W. Hersman, D. Heddle, Volker D. Burkert, A. S. Biselli, R. W. Gothe, K. Y. Kim, V. Frolov, L. Ciciani, S. Simionatto, K. L. Giovanetti, B. Asavapibhop, Hovanes Egiyan, M. Spraker, Larry Weinstein, R. A. Miskimen, H. G. Juengst, D. Branford, M. Mirazita, J. M. Laget, J. Lachniet, V. Sapunenko, Valeria Muccifora, Gerard Gilfoyle, D. Rowntree, R. S. Hakobyan, Federico Ronchetti, Philip L. Cole, Friedrich Klein, Brian Raue, P. Dragovitsch, Y. Ilieva, S. Niccolai, J. Hardie, Lei Guo, A.V. Stavinsky, D. J. Tedeschi, Nicola Bianchi, G. A. Peterson, S. Barrow, L. Todor, D. Protopopescu, S. Pozdniakov, M. Garçon, A. Shafi, 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), CLAS, and Robert, Suzanne

Subjects
Physics, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Proton, POSITIVE-STRANGENESS, PENTAQUARK, Nuclear Theory, General Physics and Astronomy, FOS: Physical sciences, PENTAQUARK, Pentaquark, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), Exotic baryon, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], POSITIVE-STRANGENESS, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

The reaction $\gamma p \to \pi^+K^-K^+n$ was studied at Jefferson Lab using a tagged photon beam with an energy range of 3-5.47 GeV. A narrow baryon state with strangeness S=+1 and mass $M=1555\pm 10$ MeV/c$^2$ was observed in the $nK^+$ invariant mass spectrum. The peak's width is consistent with the CLAS resolution (FWHM=26 MeV/c$^2$), and its statistical significance is 7.8 $\pm$ 1.0 ~$\sigma$. A baryon with positive strangeness has exotic structure and cannot be described in the framework of the naive constituent quark model. The mass of the observed state is consistent with the mass predicted by a chiral soliton model for the $\Theta^+$ baryon. In addition, the $pK^+$ invariant mass distribution was analyzed in the reaction $\gamma p\to K^-K^+p$ with high statistics in search of doubly-charged exotic baryon states. No resonance structures were found in this spectrum., Comment: 5 pages, 5 figures, add references

17. Photoproduction of the ω meson on the proton at large momentum transfer

Author

M. Battaglieri, M. Brunoldi, R. De Vita, J. M. Laget, M. Osipenko, M. Ripani, M. Taiuti, G. Adams, M. J. Amaryan, E. Anciant, M. Anghinolfi, D. S. Armstrong, B. Asavapibhop, G. Asryan, G. Audit, T. Auger, H. Avakian, S. Barrow, K. Beard, M. Bektasoglu, B. L. Berman, A. Bersani, N. Bianchi, A. S. Biselli, S. Boiarinov, S. Bouchigny, R. Bradford, D. Branford, W. J. Briscoe, W. K. Brooks, V. D. Burkert, J. R. Calarco, G. P. Capitani, D. S. Carman, B. Carnahan, A. Cazes, C. Cetina, P. L. Cole, A. Coleman, D. Cords, P. Corvisiero, D. Crabb, H. Crannell, J. P. Cummings, E. DeSanctis, P. V. Degtyarenko, R. Demirchyan, H. Denizli, L. Dennis, K. V. Dharmawardane, K. S. Dhuga, C. Djalali, G. E. Dodge, D. Doughty, P. Dragovitsch, M. Dugger, S. Dytman, M. Eckhause, H. Egiyan, K. S. Egiyan, L. Elouadrhiri, L. Farhi, R. J. Feuerbach, J. Ficenec, T. A. Forest, A. P. Freyberger, V. Frolov, H. Funsten, S. J. Gaff, M. Gai, M. Garcon, G. Gavalian, S. Gilad, G. P. Gilfoyle, K. L. Giovanetti, E. Golovach, K. Griffioen, M. Guidal, M. Guillo, L. Guo, V. Gyurjyan, C. Hadjidakis, D. Hancock, J. Hardie, D. Heddle, F. W. Hersman, K. Hicks, R. S. Hicks, M. Holtrop, C. E. Hyde-Wright, M. M. Ito, K. Joo, J. H. Kelley, M. Khandaker, W. Kim, A. Klein, F. J. Klein, A. V. Klimenko, M. Klusman, M. Kossov, L. H. Kramer, Y. Kuang, S. E. Kuhn, J. Lachniet, D. Lawrence, M. Lucas, K. Lukashin, R. W. Major, J. J. Manak, C. Marchand, S. McAleer, J. McCarthy, J. W. C. McNabb, B. A. Mecking, M. D. Mestayer, C. A. Meyer, K. Mikhailov, M. Mirazita, R. Miskimen, V. Mokeev, S. Morrow, M. U. Mozer, V. Muccifora, J. Mueller, G. S. Mutchler, J. Napolitano, S. O. Nelson, S. Niccolai, B. B. Niczyporuk, R. A. Niyazov, M. Nozar, J. T. O’Brien, A. K. Opper, G. Peterson, S. A. Philips, N. Pivnyuk, D. Pocanic, O. Pogorelko, E. Polli, B. M. Preedom, J. W. Price, D. Protopopescu, L. M. Qin, B. A. Raue, A. R. Reolon, G. Riccardi, G. Ricco, B. G. Ritchie, F. Ronchetti, P. Rossi, D. Rowntree, P. D. Rubin, K. Sabourov, C. Salgado, V. Sapunenko, R. A. Schumacher, V. S. Serov, A. Shafi, Y. G. Sharabian, J. Shaw, A. V. Skabelin, E. S. Smith, T. Smith, L. C. Smith, D. I. Sober, M. Spraker, A. Stavinsky, S. Stepanyan, P. Stoler, S. Taylor, D. J. Tedeschi, L. Todor, U. Thoma, R. Thompson, M. F. Vineyard, A. V. Vlassov, K. Wang, L. B. Weinstein, H. Weller, D. P. Weygand, C. S. Whisnant, E. Wolin, M. Wood, A. Yegneswaran, J. Yun, B. Zhang, J. Zhao, and Z. Zhou

Subjects
Physics, Particle physics, Proton, Meson, Hadron, Momentum transfer, Nuclear Theory, High Energy Physics::Phenomenology, General Physics and Astronomy, Gluon, High Energy Physics - Experiment, Nuclear physics, Baryon, Pion, High Energy Physics::Experiment, Nucleon, Nuclear Experiment
Abstract

The differential cross section, $d\sigma/dt$ for $\omega$ meson exclusive photoproduction on the proton above the resonance region ($2.6, Comment: 5 pages, 5 figures

Catalog

Books, media, physical & digital resources
See catalog results