Polarised quark distributions in the nucleon from semi-inclusive spin asymmetries

Adeva B, Akdogan T, Arik E, Arvidson A, Badelek B, Bardin G, Baum G, Berglund P, Betev L, Birsa R, de Botton N, et al. (1998)
Phys.Lett. B 420(1-2): 180-190.

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Abstract
We present a measurement of semi-inclusive spin asymmetries for positively and negatively charged hadrons from deep inelastic scattering of polarised muons on polarised protons and deuterons in the range 0.003 < x < 0.7 and Q(2) > 1 GeV2. Compared to our previous publication on this subject, with the new data the statistical errors have been reduced by nearly a factor of two. From these asymmetries and our inclusive spin asymmetries we determine the polarised quark distributions of valence quarks and non-strange sea quarks at Q(2) = 10 GeV2. The polarised u valence quark distribution, Delta u(v)(x), is positive and the polarisation increases with x. The polarised d valence quark distribution, Delta d(v)(x), is negative and the non-strange sea distribution, Delta (q) over bar(x), is consistent with zero over the measured range of x. We find for the first moments integral(0)(1) Delta u(v)(x)d x = 0.77 +/- 0.10 +/- 0.08, integral(0)(1) Delta d(v)(x)d x = -0.52 +/- 0.14 +/- 0.09 and integral(0)(1) Delta (q) over bar(x)d x = 0.01 +/- 0.04 +/- 0.03, where we assumed Delta (u) over bar(x) = Delta (d) over bar(x). We also determine for the first time the second moments of the valence distributions integral(0)(1)x Delta q(v)(x)d x. (C) 1998 Published by Elsevier Science B.V.
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Adeva B, Akdogan T, Arik E, et al. Polarised quark distributions in the nucleon from semi-inclusive spin asymmetries. Phys.Lett. B. 1998;420(1-2):180-190.
Adeva, B., Akdogan, T., Arik, E., Arvidson, A., Badelek, B., Bardin, G., Baum, G., et al. (1998). Polarised quark distributions in the nucleon from semi-inclusive spin asymmetries. Phys.Lett. B, 420(1-2), 180-190.
Adeva, B., Akdogan, T., Arik, E., Arvidson, A., Badelek, B., Bardin, G., Baum, G., Berglund, P., Betev, L., Birsa, R., et al. (1998). Polarised quark distributions in the nucleon from semi-inclusive spin asymmetries. Phys.Lett. B 420, 180-190.
Adeva, B., et al., 1998. Polarised quark distributions in the nucleon from semi-inclusive spin asymmetries. Phys.Lett. B, 420(1-2), p 180-190.
B. Adeva, et al., “Polarised quark distributions in the nucleon from semi-inclusive spin asymmetries”, Phys.Lett. B, vol. 420, 1998, pp. 180-190.
Adeva, B., Akdogan, T., Arik, E., Arvidson, A., Badelek, B., Bardin, G., Baum, G., Berglund, P., Betev, L., Birsa, R., de Botton, N., Bradamante, F., Bravar, A., Bressan, A., Bultmann, S., Burtin, E., Crabb, D., Cranshaw, J., Cuhadar, T., Dalla Torre, S., van Dantzig, R., Derro, B., Deshpande, A., Dhawan, S., Dulya, C., Eichblatt, S., Fasching, D., Feinstein, F., Fernandez, C., Forthmann, S., Frois, B., Gallas, A., Garzon, J.A., Gilly, H., Giorgi, M., von Goeler, E., Goertz, S., Gracia, G., de Groot, N., Grosse Perdekamp, M., Haft, K., von Harrach, D., Hasegawa, T., Hautle, P., Hayashi, N., Heusch, C.A., Horikawa, N., Hughes, V.W., Igo, G., Ishimoto, S., Iwata, T., Kabuss, E.M., Kageya, T., Karev, A., Kessler, H.J., Ketel, T.J., Kiryluk, J., Kisselev, Y., Kramer, D., Krivokhijine, V., Kroger, W., Kukhtin, V., Kurek, K., Kyynarainen, J., Lamanna, M., Landgraf, U., Le Goff, J.M., Lehar, F., de Lesquen, A., Lichtenstadt, J., Litmaath, M., Magnon, A., Mallot, G.K., Marie, F., Martin, A., Martino, J., Matsuda, T., Mayes, B., McCarthy, J.S., Medved, K., Meyer, W., van Middelkoop, G., Miller, D., Miyachi, Y., Mori, K., Moromisato, J., Nassalski, J., Naumann, L., Niinikoski, T.O., Oberski, J.E.J., Ogawa, A., Ozben, C., Pereira, H., Perrot-Kunne, F., Peshekhonov, D., Pinsky, L., Platchkov, S., Plo, M., Pose, D., Postma, H., Pretz, J., Puntaferro, R., Radel, G., Rijllart, A., Reicherz, G., Roberts, J., Rodriguez, M., Rondio, E., Roscherr, B., Sabo, I., Saborido, J., Sandacz, A., Savin, I., Schiavon, P., Schiller, A., Sichtermann, E.P., Simeoni, F., Smirnov, G.I., Staude, A., Steinmetz, A., Stiegler, U., Stuhrmann, H., Szleper, M., Tessarotto, F., Thers, D., Tlaczala, W., Tripet, A., Unel, G., Velasco, M., Vogt, J., Voss, R., Whitten, C., Windmolders, R., Willumeit, R., Wislicki, W., Witzmann, A., Ylostalo, J., Zanetti, A.M., Zaremba, K., Zhao, J.: Polarised quark distributions in the nucleon from semi-inclusive spin asymmetries. Phys.Lett. B. 420, 180-190 (1998).
Adeva, B, Akdogan, T, Arik, E, Arvidson, A, Badelek, B, Bardin, G, Baum, Günter, Berglund, P, Betev, L, Birsa, R, de Botton, N, Bradamante, F, Bravar, A, Bressan, A, Bultmann, S, Burtin, E, Crabb, D, Cranshaw, J, Cuhadar, T, Dalla Torre, S, van Dantzig, R, Derro, B, Deshpande, A, Dhawan, S, Dulya, C, Eichblatt, S, Fasching, D, Feinstein, F, Fernandez, C, Forthmann, S, Frois, B, Gallas, A, Garzon, JA, Gilly, H, Giorgi, M, von Goeler, E, Goertz, S, Gracia, G, de Groot, N, Grosse Perdekamp, M, Haft, K, von Harrach, D, Hasegawa, T, Hautle, P, Hayashi, N, Heusch, CA, Horikawa, N, Hughes, VW, Igo, G, Ishimoto, S, Iwata, T, Kabuss, EM, Kageya, T, Karev, A, Kessler, HJ, Ketel, TJ, Kiryluk, J, Kisselev, Y, Kramer, D, Krivokhijine, V, Kroger, W, Kukhtin, V, Kurek, K, Kyynarainen, J, Lamanna, M, Landgraf, U, Le Goff, JM, Lehar, F, de Lesquen, A, Lichtenstadt, J, Litmaath, M, Magnon, A, Mallot, GK, Marie, F, Martin, A, Martino, J, Matsuda, T, Mayes, B, McCarthy, JS, Medved, K, Meyer, W, van Middelkoop, G, Miller, David, Miyachi, Y, Mori, K, Moromisato, J, Nassalski, J, Naumann, L, Niinikoski, TO, Oberski, JEJ, Ogawa, A, Ozben, C, Pereira, H, Perrot-Kunne, F, Peshekhonov, D, Pinsky, L, Platchkov, S, Plo, M, Pose, D, Postma, H, Pretz, J, Puntaferro, R, Radel, G, Rijllart, A, Reicherz, G, Roberts, J, Rodriguez, M, Rondio, E, Roscherr, B, Sabo, I, Saborido, J, Sandacz, A, Savin, I, Schiavon, P, Schiller, A, Sichtermann, EP, Simeoni, F, Smirnov, GI, Staude, A, Steinmetz, A, Stiegler, U, Stuhrmann, H, Szleper, M, Tessarotto, F, Thers, D, Tlaczala, W, Tripet, A, Unel, G, Velasco, M, Vogt, J, Voss, R, Whitten, C, Windmolders, R, Willumeit, R, Wislicki, W, Witzmann, A, Ylostalo, J, Zanetti, AM, Zaremba, K, and Zhao, J. “Polarised quark distributions in the nucleon from semi-inclusive spin asymmetries”. Phys.Lett. B 420.1-2 (1998): 180-190.
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