Polarisation of valence and non-strange sea quarks in the nucleon from semi-inclusive spin asymmetries
- Adeva, B.
- Arik, E.
- Arvidson, A.
- Badelek, B.
- Ballintijn, M. K.
- Bardin, G.
- Baum, G.
- Berglund, P.
- Betev, L.
- Bird, I. G.
- Birsa, R.
- Björkholm, P.
- Bonner, B. E.
- de Botton, N.
- Bradamante, F.
- Bressan, A.
- Bültmann, S.
- Burtin, E.
- Cavata, C.
- Crabb, D.
- Cranshaw, J.
- Çuhadar, T.
- Dalla Torre, S.
- van Dantzig, R.
- Deshpande, A.
- Dhawan, S.
- Dulya, C.
- Dyring, A.
- Eichblatt, S.
- Faivre, J. C.
- Fasching, D.
- Feinstein, F.
- Fernandez, C.
- Frois, B.
- Garzon, J. A.
- Gaussiran, T.
- Giorgi, M.
- von Goeler, E.
- Gomez, A.
- Gracia, G.
- de Groot, N.
- Grosse Perdekamp, M.
- Gülmez, E.
- 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.
- Kishi, A.
- Kisselev, Y.
- Klostermann, L.
- Kramer, D.
- Krivokhijine, V.
- Kröger, W.
- Kyynäräinen, J.
- Lamanna, M.
- Landgraf, U.
- Layda, T.
- Le Goff, J. M.
- Lehar, F.
- de Lesquen, A.
- Lichtenstadt, J.
- Litmaath, M.
- Lopez-Ponte, S.
- Lowe, M.
- Magnon, A.
- Mallot, G. K.
- Marie, F.
- Martin, A.
- Martino, J.
- Matsuda, T.
- Mayes, B.
- McCarthy, J. S.
- Medved, K.
- van Middelkoop, G.
- Miller, D.
- Mori, K.
- Moromisato, J.
- Nagaitsev, A.
- Nassalski, J.
- Naumann, L.
- Niinikoski, T. O.
- Oberski, J. E.J.
- Ogawa, A.
- Ozben, C.
- Penzo, A.
- Perez, C.
- Perrot-Kunne, F.
- Peshekhonov, D.
- Piegaia, R.
Publication date
February 1996
DOIAbstract
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. From these asymmetries and the previously published inclusive spin asymmetries we determine, for the first time, the x-dependent spin distributions for up and down valence quarks and for non-strange sea quarks. We find that the first moments of the valence quark spin distributions are Δuv = 1.01 ± 0.19 ± 0.14 and Δdv = -0.57 ± 0.22 ± 0.11. The spin distribution function of non-strange sea quarks is consistent with zero over the measured range of x and the first moment is Δū = Δd̄ = -0.02 ± 0.09 ± 0.03
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