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18 results on '"Gearhart R"'

1. Next-to-leading order QCD analysis of polarized deep inelastic scattering data

Author

Abe, K., Akagi, T., Anderson, B. D., Anthony, P. L., Arnold, R. G., Averett, T., Band, H. R., Berisso, C. M., Bogorad, P., Borel, H., Bosted, P. E., Breton, V., Buenerd, M. J., Cates, G. D., Chupp, T. E., Churchwell, S., Coulter, K. P., Daoudi, M., Decowski, P., Erickson, R., Fellbaum, J. N., Fonvieille, H., Gearhart, R., Ghazikhanian, V., Griffioen, K. A., Hicks, R. S., Holmes, R., Hughes, E. W., Igo, G., Sebastien Incerti, Johnson, J. R., Kahl, W., Khayat, M., Kolomensky, Yu G., Kuhn, S. E., Kumar, K., Kuriki, M., Lombard-Nelsen, R., Manley, D. M., Marroncle, J., Maruyama, T., Marvin, T., Meyer, W., Meziani, Z. -E, Miller, D., Mitchell, G., Olson, M., Peterson, G. A., Petratos, G. G., Pitman, R., Prepost, R., Raines, P., Raue, B. A., Reyna, D., Rochester, L. S., Rock, S. E., Romalis, M. V., Sabatie, F., Shapiro, G., Shaw, J., Smith, T. B., Sorrell, L., Souder, P. A., Staley, F., Lorant, S. St, Stuart, L. M., Suekane, F., Szalata, Z. M., Terrien, Y., Thompson, A. K., Toole, T., Wang, X., Watson, J. W., Welsh, R. C., Wesselmann, F. R., Wright, T., Young, C. C., Youngman, B., Yuta, H., Zhang, W. -M, Zyla, P., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), E154, and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Quantum chromodynamics, Quark, Nuclear and High Energy Physics, Particle physics, Valence (chemistry), 010308 nuclear & particles physics, High Energy Physics::Phenomenology, FOS: Physical sciences, Perturbative QCD, Deep inelastic scattering, 01 natural sciences, Gluon, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Neutron, Sum rule in quantum mechanics, 010306 general physics
Abstract

We present a Next-to-Leading order perturbative QCD analysis of world data on the spin dependent structure functions $g_1^p, g_1^n$, and $g_1^d$, including the new experimental information on the $Q^2$ dependence of $g_1^n$. Careful attention is paid to the experimental and theoretical uncertainties. The data constrain the first moments of the polarized valence quark distributions, but only qualitatively constrain the polarized sea quark and gluon distributions. The NLO results are used to determine the $Q^2$ dependence of the ratio $g_1/F_1$ and evolve the experimental data to a constant $Q^2 = 5 GeV^2$. We determine the first moments of the polarized structure functions of the proton and neutron and find agreement with the Bjorken sum rule., Comment: 21 pages, 4 figures; final version to be published in Phys. Lett. B. References updated. Uses elsart.cls version 1996/04/22, 2e-1.41

Published
1997
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2. Measurements of the $Q^2$ dependence of the proton and neutron spin structure functions $g^p_1$ and $g^n_1$

Author

Anthony, P.L., Arnold, R.G., Averett, T., Band, H.R., Berisso, M.C., Borel, H., Bosted, P.E., Bultmann, S.L., Buenerd, M., Chupp, T., Churchwell, S., Court, G.R., Crabb, D., Day, D., Decowski, P., DePietro, P., Erbacher, R., Erickson, R., Feltham, A., Fonvieille, H., Frlez, E., Gearhart, R., Ghazikhanian, V., Gomez, J., Griffioen, K.A., Harris, C., Houlden, M.A., Hughes, E.W., Hyde-Wright, C.E., Igo, G., Incerti, S., Jensen, J., Johnson, J.R., King, P.M., Kolomensky, Yu.G., Kuhn, S.E., Lindgren, R., Lombard-Nelsen, R.M., Marroncle, J., McCarthy, J., McKee, P., Meyer, W., Mitchell, G.S., Mitchell, J., Olson, M., Penttila, S., Peterson, G.A., Petratos, G.G., Pitthan, R., Pocanic, D., Prepost, R., Prescott, C., Qin, L.M., Raue, B.A., Reyna, D., Rochester, L.S., Rock, S., Rondon-Aramayo, O., Sabatie, F., Sick, I., Smith, T., Sorrell, L., Staley, F., Stuart, L.M., Szalata, Z., Terrien, Y., Tobias, A., Todor, L., Toole, T., Trentalange, S., Walz, D., Welsh, R.C., Wesselmann, F.R., Wright, T.R., Young, C.C., Zeier, M., Zhu, H., Zihlmann, B., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E155

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Abstract

he structure functions g1p and g1n have been measured over the range 0.014 < x < 0.9 and 1 < Q2 < 40 GeV2 using deep-inelastic scattering of 48 GeV longitudinally polarized electrons from polarized protons and deuterons. We find that the Q2 dependence of g1p (g1n) at fixed x is very similar to that of the spin-averaged structure function F1p (F1n). From a NLO QCD fit to all available data we find $\Gamma_1^p - \Gamma_1^n =0.176 \pm 0.003 \pm 0.007$ at Q2=5 GeV2, in agreement with the Bjorken sum rule prediction of 0.182 \pm 0.005.

Published
2000

3. Measurement of the deuteron spin structure function $g^{d}_1(x)$ for $1\ (GeV/c)^2 < Q^2 < 40\ (GeV/c)^2$

Author

Anthony, P.L., Arnold, R.G., Averett, T., Band, H.R., Berisso, M.C., Borel, H., Bosted, P.E., Bultmann, S.L., Buenerd, M., Chupp, T., Churchwell, S., Court, G.R., Crabb, D., Day, D., Decowski, P., DePietro, P., Erbacher, R., Erickson, R., Feltham, A., Fonvieille, H., Frlez, E., Gearhart, R., Ghazikhanian, V., Gomez, J., Griffioen, K.A., Harris, C., Houlden, M.A., Hughes, E.W., Hyde-Wright, C.E., Igo, G., Incerti, S., Jensen, J., Johnson, J.R., King, P.M., Kolomensky, Yu.G., Kuhn, S.E., Lindgren, R., Lombard-Nelsen, R.M., Marroncle, J., McCarthy, J., McKee, P., Meyer, W., Mitchell, G.S., Mitchell, J., Olson, M., Penttila, S., Peterson, G.A., Petratos, G.G., Pitthan, R., Pocanic, D., Prepost, R., Prescott, C., Qin, L.M., Raue, B.A., Reyna, D., Rochester, L.S., Rock, S., Rondon-Aramayo, O., Sabatie, F., Sick, I., Smith, T., Sorrell, L., Staley, F., Stuart, L.M., Szalata, Z., Terrien, Y., Tobias, A., Todor, L., Toole, T., Trentalange, S., Walz, D., Welsh, R.C., Wesselmann, F.R., Wright, T.R., Young, C.C., Zeier, M., Zhu, H., Zihlmann, B., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), and Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Nuclear Experiment
Abstract

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

Published
1999

4. Measurement of the proton and deuteron spin structure functions $g_{2}$ and asymmetry $A_{2}^{1}$

Author

Anthony, P.L., Arnold, R.G., Averett, T., Band, H.R., Berisso, M.C., Borel, H., Bosted, P.E., Bultmann, S.L., Buenerd, M., Chupp, T., Churchwell, S., Court, G.R., Crabb, D., Day, D., Decowski, P., DePietro, P., Erbacher, R., Erickson, R., Feltham, A., Fonvieille, H., Frlez, E., Gearhart, R., Ghazikhanian, V., Gomez, J., Griffioen, K.A., Harris, C., Houlden, M.A., Hughes, E.W., Hyde-Wright, C.E., Igo, G., Incerti, S., Jensen, J., Johnson, J.K., King, P.M., Kolomensky, Yu.G., Kuhn, S.E., Lindgren, R., Lombard-Nelsen, R.M., Marroncle, J., McCarthy, J., McKee, P., Meyer, W., Mitchell, G.S., Mitchell, J., Olson, M., Penttila, S., Peterson, G.A., Petratos, G.G., Pitthan, R., Pocanic, D., Prepost, R., Prescott, C., Qin, L.M., Raue, B.A., Reyna, D., Rochester, L.S., Rock, S., Rondon-Aramayo, O., Sabatie, F., Sick, I., Smith, T., Sorrell, L., Staley, F., Stuart, L.M., Szalata, Z., Terrien, Y., Tobias, A., Todor, L., Toole, T., Trentalange, S., Walz, D., Welsh, R.C., Wesselmann, F.R., Wright, T.R., Young, C.C., Zeier, M., Zhu, H., Zihlmann, B., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E155

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
1999

5. Inclusive hadron photoproduction from longitudinally polarized protons and deuterons

Author

Anthony, P.L., Arnold, R.G., Averett, T., Band, H.R., Berisso, M.C., Borel, H., Bosted, P.E., Bultmann, S.L., Buenerd, M., Chupp, T., Churchwell, S., Court, G.R., Crabb, D., Day, D., Decowski, P., DePietro, P., Erbacher, R., Erickson, R., Feltham, A., Fonvieille, H., Frlez, E., Gearhart, R., Ghazikhanian, V., Gomez, J., Griffioen, K.A., Harris, C., Houlden, M.A., Hughes, E.W., Hyde-Wright, C.E., Igo, G., Incerti, S., Jensen, J., Johnson, J.R., King, P.M., Kolomensky, Yu.G., Kuhn, S.E., Lindgren, R., Lombard-Nelsen, R.M., Marroncle, J., McCarthy, J., McKee, P., Meyer, W., Mitchell, G.S., Mitchell, J., Olson, M., Penttila, S., Peterson, G.A., Petratos, G.G., Pitthan, R., Pocanic, D., Prepost, R., Prescott, C., Qin, L.M., Raue, B.A., Reyna, D., Rochester, L.S., Rock, S., Rondon-Aramayo, O., Sabatie, F., Sick, I., Smith, T., Sorrell, L., Staley, F., Stuart, L.M., Szalata, Z., Terrien, Y., Tobias, A., Todor, L., Toole, T., Trentalange, S., Walz, D., Welsh, R.C., Wesselmann, F.R., Wright, T.R., Young, C.C., Zeier, M., Zhu, H., Zihlmann, B., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E155

Subjects
Nuclear Theory, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Nuclear Experiment
Abstract

We report measurements of the asymmetry A_parallel for inclusive hadron production on longitudinally polarized proton and deuteron targets by circularly polarized photons. The photons were produced via internal and external bremsstrahlung from an electron beam of 48.35 GeV. Asymmetries for both positive and negative signed hadrons, and a subset of identified pions, were measured in the momentum range 10

Published
1999

6. Measurements of the proton and deuteron spin structure functions $g_{1}$ and $g_{2}$

Author

Abe, K., Akagi, T., Anthony, P. L., Antonov, R., Arnold, R. G., Averett, T., Band, H. R., Bauer, J. M., Borel, H., Bosted, P. E., Vincent Breton, Button-Shafer, J., Chen, J. P., Chupp, T. E., Clendenin, J., Comptour, C., Coulter, K. P., Court, G., Crabb, D., Daoudi, M., Day, D., Dietrich, F. S., Dunne, J., Dutz, H., Erbacher, R., Fellbaum, J., Feltham, A., Fonvieille, H., Frlez, E., Garvey, D., Gearhart, R., Gomez, J., Grenier, P., Griffioen, K. A., Hoibraten, S., Hughes, E. W., Hyde-Wright, C., Johnson, J. R., Kawall, D., Klein, A., Kuhn, S. E., Kuriki, M., Lindgren, R., Liu, T. J., Lombard-Nelsen, R. M., Marroncle, J., Maruyama, T., Maruyama, X. K., Mccarthy, J., Meyer, W., Meziani, Z. E., Minehart, R., Mitchell, J., Morgenstern, J., Petratos, G. G., Pitthan, R., Pocanic, D., Prescott, C., Prepost, R., Raines, P., Raue, B., Reyna, D., Rijllart, A., Roblin, Y., Rochester, L., Rock, S. E., Rondon, O. A., Sick, I., Smith, L. C., Smith, T. B., Spengos, M., Staley, F., Steiner, P., Stuart, L. M., Suekane, F., Szalata, Z. M., Hao Tang, Terrien, Y., Usher, T., Walz, D., Wesselmann, F., White, J. L., Witte, K., Young, C., Youngman, B., Yuta, H., Zapalac, G., Zihlmann, B., Zimmermann, D., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E143

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Abstract

Measurements are reported of the proton and deuteron spin structure functions g1 at beam energies of 29.1, 16.2, and 9.7 GeV and g2 at a beam energy of 29.1 GeV. The integrals of g1 over x have been evaluated at fixed Q**2 = 3 (GeV/c)**2 using the full data set. The Q**2 dependence of the ratio g1/F1 was studied and found to be small for Q**2 > 1 (GeV/c)**2. Within experimental precision the g2 data are well-described by the Wandzura-Wilczek twist-2 contribution. Twist-3 matrix elements were extracted and compared to theoretical predictions. The asymmetry A2 was measured and found to be significantly smaller than the positivity limit for both proton and deuteron targets. A2 for the proton is found to be positive and inconsistent with zero. Measurements of g1 in the resonance region show strong variations with x and Q**2, consistent with resonant amplitudes extracted from unpolarized data. These data allow us to study the Q**2 dependence of the first moments of g1 below the scaling region.

Published
1998

7. Measurement of the proton and deuteron spin structure function $g_1$ in the resonance region

Author

Abe, K., Akagi, T., Anthony, P. L., Antonov, R., Arnold, R. G., Averett, T., Band, H. R., Bauer, J. M., Borel, H., Bosted, P. E., Vincent Breton, Button-Shafer, J., Chen, J. P., Chupp, T. E., Clendenin, J., Comptour, C., Coulter, K. P., Court, G., Crabb, D., Daoudi, M., Day, D., Dietrich, F. S., Dunne, J., Dutz, H., Erbacher, R., Fellbaum, J., Feltham, A., Fonvieille, H., Frlez, E., Garvey, D., Gearhart, R. A., Gomez, J., Grenier, P., Griffioen, K. A., Hoibraten, S., Hughes, E. W., Hyde-Wright, C. E., Johnson, J. R., Kawall, D., Klein, A., Kuhn, S. E., Kuriki, M., Lindgren, R., Liu, T. J., Lombard-Nelsen, R. M., Marroncle, J., Maruyama, T., Maruyama, X. K., Mccarthy, J., Meyer, W., Meziani, Z. E., Minehart, R., Mitchell, J., Morgenstern, J., Petratos, G. G., Pitthan, R., Pocanic, D., Prescott, C., Prepost, R., Raines, P., Raue, B. A., Reyna, D., Rijllart, A., Roblin, Y., Rochester, L. S., Rock, S. E., Rondon, O. A., Sick, I., Smith, L. C., Smith, T. B., Spengos, M., Staley, F., Steiner, P., Stuart, L. M., Suekane, F., Szalata, Z. M., Hao Tang, Terrien, Y., Usher, T., Walz, D., Wesselmann, F., White, J. L., Witte, K., Young, C. C., Youngman, B., Yuta, H., Zapalac, G., Zihlmann, B., Zimmerman, D., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E143

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Abstract

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

Published
1997

8. Deep inelastic scattering of polarized electrons by polarized $^3$He and the study of the neutron spin structure

Author

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

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Abstract

The neutron longitudinal and transverse asymmetries $A^n_1$ and $A^n_2$ have been extracted from deep inelastic scattering of polarized electrons by a polarized $^3$He target at incident energies of 19.42, 22.66 and 25.51 GeV. The measurement allows for the determination of the neutron spin structure functions $g^n_1 (x,Q^2)$ and $g^n_2(x,Q^2)$ over the range $0.03 < x < 0.6$ at an average $Q^2$ of 2 (GeV$/c)^2$. The data are used for the evaluation of the Ellis-Jaffe and Bjorken sum rules. The neutron spin structure function $g^n_1 (x,Q^2)$ is small and negative within the range of our measurement, yielding an integral ${\int_{0.03}^{0.6} g_1^n(x) dx}= -0.028 \pm 0.006 (stat) \pm 0.006 (syst) $. Assuming Regge behavior at low $x$, we extract $\Gamma_1^n=\int^1_0 g^n_1(x)dx = -0.031 \pm 0.006 (stat)\pm 0.009 (syst) $. Combined with previous proton integral results from SLAC experiment E143, we find $\Gamma_1^p - \Gamma_1^n = 0.160 \pm 0.015$ in agreement with the Bjorken sum rule prediction $\Gamma^p_1 - \Gamma ^n_1 = 0.176 \pm 0.008$ at a $Q^2$ value of 3 (GeV$/c)^2$ evaluated using $\alpha_s = 0.32\pm 0.05$.

Published
1996

9. Precision measurement of the proton spin structure function $g^{p}_{1}$

Author

Abe, K., Akagi, T., Anthony, P. L., Antonov, R., Arnold, R. G., Averett, T., Band, H. R., Bauer, J. M., Borel, H., Bosted, P. E., Vincent Breton, Button-Shafer, J., Chen, J. P., Chupp, T. E., Clendenin, J., Comptour, C., Coulter, K. P., Court, G., Crabb, D., Daoudi, M., Day, D., Dietrich, F. S., Dunne, J., Dutz, H., Erbacher, R., Fellbaum, J., Feltham, A., Fonvieille, H., Frlez, E., Garvey, D., Gearhart, R., Gomez, J., Grenier, P., Griffioen, K. A., Hoeibraten, S., Hughes, E. W., Hyde-Wright, C., Johnson, J. R., Kawall, D., Klein, A., Kuhn, S. E., Kuriki, M., Lindgren, R., Liu, T. J., Lombard-Nelsen, R. M., Marroncle, J., Maruyama, T., Maruyama, X. K., Mccarthy, J., Meyer, W., Meziani, Z. E., Minehart, R., Mitchell, J., Morgenstern, J., Petratos, G. G., Pitthan, R., Pocanic, D., Prescott, C., Prepost, R., Raines, P., Raue, B., Reyna, D., Rijllart, A., Roblin, Y., Rochester, L., Rock, S. E., Rondon, O. A., Sick, I., Smith, L. C., Smith, T. B., Spengos, M., Staley, F., Steiner, P., Stuart, L. M., Suekane, F., Szalata, Z. M., Hao Tang, Terrien, Y., Usher, T., Walz, D., White, J. L., Witte, K., Young, C., Youngman, B., Yuta, H., Zapalac, G., Zihlmann, B., Zimmermann, D., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E143

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Abstract

We have measured the ratio g[sup p][sub 1]/F[sup p][sub 1] over the range 0.029 < x < 0.8 and 1.3 < Q2 < 10 (GeV/c)2 using deep-inelastic scattering of polarized electrons from polarized ammonia. An evaluation of the integral (integral)g[sup p][sub 1](x,Q2)dx at fixed Q2 = 3 (GeV/c)2 yields 0.127 ± 0.004(stat) ± 0.010(syst), in agreement with previous experiments, but well below the Ellis-Jaffe sum rule prediction of 0.160 ± 0.006. In the quark-parton model, this implies Delta q = 0.27 ± 0.10.

Published
1995

10. Precision measurement of the deuteron spin structure function $g^{d}_{1}$

Author

Abe, K., Akagi, T., Anthony, P. L., Antonov, R., Arnold, R. G., Averett, T., Band, H. R., Bauer, J. M., Borel, H., Bosted, P. E., Vincent Breton, Button-Shafer, J., Chen, J. P., Chupp, T. E., Clendenin, J., Comptour, C., Coulter, K. P., Court, G., Crabb, D., Daoudi, M., Day, D., Dietrich, F. S., Dunne, J., Dutz, H., Erbacher, R., Fellbaum, J., Feltham, A., Fonvieille, H., Frlez, E., Garvey, D., Gearhart, R., Gomez, J., Grenier, P., Griffioen, K. A., Hoeibraten, S., Hughes, E. W., Hyde-Wright, C., Johnson, J. R., Kawall, D., Klein, A., Kuhn, S. E., Kuriki, M., Lindgren, R., Liu, T. J., Lombard-Nelsen, R. M., Marroncle, J., Maruyama, T., Maruyama, X. K., Mccarthy, J., Meyer, W., Meziani, Z. E., Minehart, R., Mitchell, J., Morgenstern, J., Petratos, G. G., Pitthan, R., Pocanic, D., Prescott, C., Prepost, R., Raines, P., Raue, B., Reyna, D., Rijllart, A., Roblin, Y., Rochester, L., Rock, S. E., Rondon, O. A., Sick, I., Smith, L. C., Smith, T. B., Spengos, M., Staley, F., Steiner, P., Stuart, L. M., Suekane, F., Szalata, Z. M., Hao Tang, Terrien, Y., Usher, T., Walz, D., White, J. L., Witte, K., Young, C., Youngman, B., Yuta, H., Zapalac, G., Zihlmann, B., Zimmermann, D., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E143

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Abstract

We report on a high-statistics measurement of the deuteron spin structure function g[sup d][sub 1] at a beam energy of 29 GeV in the kinematic range 0.029 < x < 0.8 and 1 < Q2 < 10 (GeV/c)2. The integral Gamma [sup d][sub 1] = (integral)[sup 1][sub 0]g[sup d][sub 1]dx evaluated at fixed Q2 = 3 (GeV/c)2 gives 0.042 ± 0.003(stat) ± 0.004(syst). Combining this result with our earlier measurement of g[sup p][sub 1], we find Gamma [sup p][sub 1]- Gamma [sup n][sub 1] = 0.163 ± 0.010(stat) ± 0.016(syst), which agrees with the prediction of the Bjorken sum rule with O( alpha [sup 3][sub s]) corrections, Gamma [sup p][sub 1]- Gamma [sup n][sub 1] = 0.171 ± 0.008. We find the quark contribution to the proton helicity to be Delta q = 0.30 ± 0.06.

Published
1995

11. Measurements of nucleon spin structure at SLAC in end station A

Author

Arnold, R., Bosted, P., Dunne, J., Fellbaum, J., Rock, S., Reyna, D., Szalata, Z., White, J., Feltham, A., Fritschi, D., Jourdan, J., Masson, G., Robinson, S., Sick, I., Steiner, P., Gomez, J., Mitchell, J., Nanda, S., Borel, H., Lombard-Nelson, R., Marroncle, J., Staley, F., Terrien, Y., Bertin, P.Y., BRETON, Vincent, Fonvieille, H., Degtyarenko, P., Shuvalov, S., Dietrich, F., Bauer, J., Button-Shafer, J., Elouadrhiri, L., Hicks, R., Miskimen, R., Peterson, G., Wang, K., Chupp, T., Hyde-Wright, C., Klein, A., Kuhn, S., Anthony, P., Clendenin, J., Dutz, H., Erbacher, R., Gearhart, R., Hughes, E., Murayama, T., Meyer, W., Pitthan, R., Prescott, C., Rochester, L., Stuart, L.M., Tang, Hao, Walz, D., Witte, K., Young, C., Decowski, P., Abe, K., Akagi, T., Suekane, F., Yuta, H., Averett, T., Cothran, C., Crabb, D., Day, D., Frlez, E., Gladyshev, R., Hoeibraten, S., Lindgren, R., Liu, T., Lourie, R., McCarthy, J., McKee, P., Minehart, R., Pocanic, D., Rondon-Aramayo, O., Smith, C., VanVerst, S., Griffioen, K., Antonov, R., Raines, P., Band, H., Johnson, J., Prepost, R., Zapalac, G., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E155

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
1994

12. Nuclear spin structure measurements at SLAC

Author

Arnold, R., Bosted, P., Dunne, J., Rock, S., Szalata, Z., White, J., Fritschi, D., Jourdan, J., Masson, G., Robinson, S., Sick, I., Gomez, J., Mougey, J., Nanda, S., Thompson, A., Anthony, P., Dietrich, F., Mugge, M., Bibber, K., Button-Shafer, J., Chupp, T., Hicks, K., Vincent Breton, Fonvieille, H., Benton, D., Griffioen, K., Bodek, A., Barbaro, P., Sakumoto, W., Walker, R., Borel, H., Lombard, R., Marroncle, J., Morgenstern, J., Staley, F., Terrien, Y., Atwood, W., Clendenin, J., Fieguth, T., Gearhart, R., Hughes, E., Maruyama, T., Meyer, W., Moffeit, K., Odian, A., Petratos, G., Prescott, C., Rochester, L., Usher, T., Woods, M., Young, C., Kawall, D., Kuhn, S., Meziani, Z., Lichtenstadt, J., Baghaei, H., Jie Chen, Crabb, D., Day, D., Keeter, K., Lindgren, R., Lourie, R., Marshall, R., Mccarthy, J., Minehart, R., Mitchell, J., Norum, B., Pocanic, D., Rondon-Aramayo, O., Smith, C., Verst, S., Band, H., Johnson, J., Prepost, R., Zapalac, G., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Sinha B. Viyogi Y.P. Raha S., and E143

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
1993

13. A proposal for a precision measurement of the neutron spin structure function using a polarized $^3$He target

Author

Arnold, R., Bosted, P., Rock, S., White, J., Szalata, Z., BRETON, Vincent, Fonvieille, H., Roblin, Y., Fuzesy, R., Pripstein, D., Shapiro, G., Borel, H., Lombard-Nelson, R., Marroncle, J., Staley, F., Terrien, Y., Anderson, B.D., Madey, R., Manley, D.M., Petratos, G.G., Watson, J.W., Dietrich, F.S., Chupp, T., Coulter, K., Smith, T., Thompson, A.K., Kuhn, S., Cates, G.D., Kumar, K., Middleton, H., Anthony, P., Dutz, H., Gearhart, R., Hughes, E., Kawall, D., Murayama, T., Meyer, W., Pitthan, R., Rokni, S.H., Stuart, L.M., Woods, M., Young, C., Holmes, R., Souder, P.A., Xu, J., Auerbach, L., Margulies, J., Martoff, J., Meziani, Z.E., Band, H., Johnson, J., Prepost, R., Zapalac, G., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E154

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
1993

14. Measurements of the nucleon spin structure at SLAC in end station A

Author

Arnold, R.G., Bosted, P., Dunne, J., Rock, Stephen., Szalata, Z.M., White, J.T., Fritzschi, D., Jourdan, J., Masson, G., Robinson, S., Sick, I., Gomez, J., Mougey, J., Nanda, S., Thompson, A., Anthony, P., Dietrich, F., Mugge, M., van Bibber, K., Button-Shafer, J., Chupp, T., Hicks, K., Breton, Vincent, Fonvieille, H., Benton, D., Griffioen, K., Bodek, A., de Barbaro, P., Sakumoto, W., Walker, R.C., Borel, H., Lombard, R.M., Marroncle, J., Morgenstern, J., Staley, F., Terrien, Y., Atwood, W.B., Clendenin, J.E., Fieguth, T.H., Gearhart, R., Hughes, E.B., Maruyama, T., Meyer, W.T., Moffeit, K.C., Odian, A., Petratos, G., Prescott, C.Y., Rochester, L.S., Usher, T., Woods, M., Young, C., Kawall, D., Kuhn, S., Meziani, Z.E., Lichtenstadt, J., Baghaei, H., Chen, Jie, Crabb, D., Day, D., Keeter, K., Lindgren, R., Lourie, R., Marshall, R., Mccarthy, J.S., Minehart, R., Mitchell, J., Norum, B.E., Pocanic, D., Rondon-Aramayo, O., Smith, C., van Verst, S., Band, H., Johnson, J.R., Prepost, R., Zapalac, G., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E143

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Published
1992

15. Measurement of the neutron spin structure function $g_{2}^{n}$ and asymmetry $a_{2}^{n}$

Author

Abe, K., Akagi, T., Anderson, B. D., Anthony, P. L., Arnold, R. G., Averett, T., Band, H. R., Berisso, C. M., Bogorad, P., Borel, H., Bosted, P. E., Vincent Breton, Buenerd, M., Cates, G. D., Chupp, T. E., Churchwell, S., Coulter, K. P., Daoudi, M., Decowski, P., Erickson, R., Fellbaum, J., Fonvieille, H., Gearhart, R., Ghazikhanian, V., Griffioen, K. A., Hicks, R. S., Holmes, R., Hughes, E. W., Igo, G., Incerti, S., Johnson, J. R., Kahl, W., Khayat, M., Kolomensky, Yu G., Kuhn, S. E., Kumar, K., Kuriki, M., Lombard-Nelsen, R. M., Manley, D. M., Marroncle, J., Maruyama, T., Marvin, T., Meyer, W., Meziani, Z. E., Miller, R., Mitchell, G., Olson, M., Peterson, G. A., Petratos, G. G., Pitthan, R., Prepost, R., Raines, P., Raue, B., Reyna, D., Rochester, L., Rock, S. E., Romalis, M. V., Sabatie, F., Shapiro, G., Shaw, J., Smith, T. B., Sorrell, L., Souder, P. A., Staley, F., Stuart, L. M., Suekane, F., Szalata, Z. M., Terrien, Y., Thompson, A. K., Toole, T., Wang, X., Watson, J. W., Welsh, R. C., Wesselmann, F., Wright, T., Young, C., Youngman, B., Yuta, H., Zhang, W. M., Zyla, P., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), E154, and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)

Subjects
High Energy Physics - Experiment (hep-ex), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], FOS: Physical sciences, High Energy Physics - Experiment
Abstract

We have measured the neutron structure function g$_{2}^{n}$ and the virtual photon-nucleon asymmetry A$_{2}^{n}$ over the kinematic range $0.014\leq x \leq 0.7$ and $1.0 \leq Q^{2} \leq 17.0$ by scattering 48.3 GeV longitudinally polarized electrons from polarized $^{3}$He. Results for A$_{2}^{n}$ are significantly smaller than the $\sqrt{R}$ positivity limit over most of the measured range and data for g$_2^{n}$ are generally consistent with the twist-2 Wandzura-Wilczek prediction. Using our measured g$_{2}^{n}$ we obtain results for the twist-3 reduced matrix element $d_{2}^{n}$, and the integral $\int$g$_{2}^{n}(x)dx$ in the range $0.014\leq x \leq 1.0$. Data from this experiment are combined with existing data for g$_{2}^{n}$ to obtain an average for $d_{2}^{n}$ and the integral $\int$g$_{2}^{n}(x)dx$., Comment: 10 pages, 3 figures. To be published in Physics Letters B

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16. Measurements of $R = \sigma_{L} / \sigma_{T}$ for 0.03 $<$ x $<$ 0.1 and fit to world data

Author

Abe, K., Akagi, T., Anthony, P. L., Antonov, R., Arnold, R. G., Averett, T., Band, H. R., Bauer, J. M., Borel, H., Bosted, P. E., Vincent Breton, Button-Shafer, J., Chen, J. P., Chupp, T. E., Clendenin, J., Comptour, C., Coulter, K. P., Court, G., Crabb, D., Daoudi, M., Day, D., Dietrich, F. S., Dunne, J., Dutz, H., Erbacher, R., Fellbaum, J., Feltham, A., Fonvieille, H., Frlez, E., Garvey, D., Gearhart, R., Gomez, J., Grenier, P., Griffioen, K. A., Hoibraten, S., Hughes, E. W., Hyde-Wright, C., Johnson, J. R., Kawall, D., Klein, A., Kuhn, S. E., Kuriki, M., Lindgren, R., Liu, T. J., Lombard-Nelsen, R. M., Marroncle, J., Maruyama, T., Maruyama, X. K., Mccarthy, J., Meyer, W., Meziani, Z. E., Minehart, R., Mitchell, J., Morgenstern, J., Petratos, G. G., Pitthan, R., Pocanic, D., Prescott, C., Prepost, R., Raines, P., Raue, B., Reyna, D., Rijllart, A., Roblin, Y., Rochester, L. S., Rock, S. E., Rondon, O. A., Sick, I., Smith, L. C., Smith, T. B., Spengos, M., Staley, F., Steiner, P., Stuart, L. M., Suekane, F., Szalata, Z. M., Hao Tang, Terrien, Y., Usher, T., Walz, D., Wesselmann, F., White, J. L., Witte, K., Young, C. C., Youngman, B., Yuta, H., Zapalac, G., Zihlmann, B., Zimmermann, D., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E143

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics
Abstract

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

17. Spin structure measurements at SLAC

Author

Meyer, W., Abe, K., Akagi, T., Anthony, P. L., Antonov, R., Arnold, R. G., Averett, T., Band, H. R., Bauer, J. M., Borel, H., Bosted, P. E., Vincent Breton, Button-Shafer, J., Chen, J. P., Chupp, T. E., Clendenin, J., Comptour, C., Coulter, K. P., Court, G., Crabb, D., Daoudi, M., Day, D., Dietrich, F. S., Dunne, J., Dutz, H., Erbacher, R., Fellbaum, J., Feltham, A., Fonvieille, H., Frlez, E., Garvey, D., Gearhart, R., Gomez, J., Grenier, P., Griffioen, K., Hoibraten, S., Hughes, E. W., Hyde-Wright, C., Johnson, J. R., Kawall, D., Klein, A., Kuhn, S. E., Kuriki, M., Lindgren, R., Liu, T., Lombard-Nelsen, R. M., Marroncle, J., Maruyama, T., Maruyama, X. K., Mccarthy, J., Meziani, Z. E., Minehart, R., Mitchell, J., Morgenstern, J., Petratos, G. G., Pitthan, R., Pocanic, D., Prescott, C., Prepost, R., Raines, P., Raue, B., Reyna, D., Rijllart, A., Roblin, Y., Rochester, L. S., Rock, S. E., Rondon-Aramayo, O., Sick, I., Smith, L. C., Smith, T. B., Spengos, M., Staley, F., Steiner, P., Stuart, L. M., Suekane, F., Szalata, Z. M., Hao Tang, Terrien, Y., Usher, T., Walz, D., White, J. L., Witte, K., Young, C. C., Youngman, B., Yuta, H., Zapalac, G., Zihlmann, B., Zimmermann, D., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Wagner G.J. Bilger R. Hehl T., and E143

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]

18. Measurements of the Q$^2$-dependence of the proton and deuteron spin structure functions $g^{p}_{1}$ and $g^{d}_{1}$

Author

Abe, K., Akagi, T., Anthony, P. L., Antonov, R., Arnold, R. G., Averett, T., Band, H. R., Bauer, J. M., Borel, H., Bosted, P. E., Vincent Breton, Button-Shafer, J., Chen, J. P., Chupp, T. E., Clendenin, J., Comptour, C., Coulter, K. P., Court, G., Crabb, D., Daoudi, M., Day, D., Dietrich, F. S., Dunne, J., Dutz, H., Erbacher, R., Fellbaum, J., Feltham, A., Fonvieille, H., Frlez, E., Garvey, D., Gearhart, R., Gomez, J., Grenier, P., Griffioen, K. A., Hoeibraten, S., Hughes, E. W., Hyde-Wright, C., Johnson, J. R., Kawall, D., Klein, A., Kuhn, S. E., Kuriki, M., Lindgren, R., Liu, T. J., Lombard-Nelsen, R. M., Marroncle, J., Maruyama, T., Maruyama, X. K., Mccarthy, J., Meyer, W., Meziani, Z. E., Minehart, R., Mitchell, J., Morgenstern, J., Petratos, G. G., Pitthan, R., Pocanic, D., Prescott, C., Prepost, R., Raines, P., Raue, B., Reyna, D., Rijllart, A., Roblin, Y., Rochester, L., Rock, S. E., Rondon Aramayo, O., Sick, I., Smith, L. C., Smith, T. B., Spengos, M., Staley, F., Steiner, P., Stuart, L. M., Suekane, F., Szalata, Z. M., Hao Tang, Terrien, Y., Usher, T., Walz, D., White, J. L., Witte, K., Young, C., Youngman, B., Yuta, H., Zapalac, G., Zihlmann, B., Zimmermann, D., Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and E143

Subjects
[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]
Abstract

The ratio g1/F1 has been measured over the range 0.03

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