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Polarised quark distributions in the nucleon from semi-inclusive spin asymmetries
- Source :
- Adeva, B, Ketel, T J, van Middelkoop, G & Sichterman, E P 1998, ' Polarized quark distributions in the nucleon from semi-inclusive spin-asymmetries. ', Physics Letters B, vol. 420, pp. 180-190 . https://doi.org/10.1016/S0370-2693(97)01546-3, Physics Letters B, 420, 180-190. Elsevier, Scopus-Elsevier, 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, Bültmann, S, Burtin, E, Crabb, D, Cranshaw, J, Çuhadar, 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, Krämer, D, Krivokhijine, V, Kröger, W, Kukhtin, V, Kurek, K, Kyynäräinen, 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 1998, ' Polarised quark distributions in the nucleon from semi-inclusive spin asymmetries ', Physics Letters Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 420, no. 1-2, pp. 180-190 . https://doi.org/10.1016/S0370-2693(97)01546-3
- Publication Year :
- 1998
- Publisher :
- Elsevier BV, 1998.
-
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$1 GeV$^2$. 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 GeV$^2$. 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, $\Delta \bar q(x)$, is consistent with zero over the measured range of $x$. We find for the first moments $\int_0^1 \Delta u_v(x) dx = 0.77 \pm 0.10 \pm 0.08$, $\int_0^1 \Delta d_v(x) dx = -0.52 \pm 0.14 \pm 0.09$ and $\int_0^1 \Delta \bar q(x) dx= 0.01 \pm 0.04 \pm 0.03$, where we assumed $\Delta \bar u(x) = \Delta \bar d(x)$. We also determine for the first time the second moments of the valence distributions $\int_0^1 x \Delta q_v(x) dx$.<br />Comment: 17 pages
- Subjects :
- Quark
Physics
Nuclear and High Energy Physics
Particle physics
Muon
Valence (chemistry)
SMC
Hadron
FOS: Physical sciences
SIDIS
Polarized quark distributions
Deep inelastic scattering
High Energy Physics - Experiment
Nuclear physics
High Energy Physics - Experiment (hep-ex)
Deuterium
High Energy Physics::Experiment
Nucleon
Particle Physics - Experiment
Subjects
Details
- ISSN :
- 03702693
- Volume :
- 420
- Database :
- OpenAIRE
- Journal :
- Physics Letters B
- Accession number :
- edsair.doi.dedup.....17f93f2d4c7ad6edf81540922f362235