Polarisation of valence and non-strange sea quarks in the nucleon from semi-inclusive spin asymmetries

B. Adeva*, E. Arik, A. Arvidson, B. Badelek, M. K. Ballintijn, G. Bardin, G. Baum, P. Berglund, L. Betev, I. G. Bird, R. Birsa, P. Björkholm, B. E. Bonner, N. de Botton, F. Bradamante, A. Bressan, S. Bültmann, E. Burtin, C. Cavata, D. CrabbJ. Cranshaw, T. Çuhadar, S. Dalla Torre, R. van Dantzig, A. Deshpande, S. Dhawan, C. Dulya, A. Dyring, S. Eichblatt, J. C. Faivre, D. Fasching, F. Feinstein, C. Fernandez, B. Frois, J. A. Garzon, T. Gaussiran, M. Giorgi, E. von Goeler, A. Gomez, G. Gracia, N. de Groot, M. Grosse Perdekamp, E. Gülmez, D. von Harrach, T. Hasegawa, P. Hautle, N. Hayashi, C. A. Heusch, N. Horikawa, V. W. Hughes, G. Igo, S. Ishimoto, T. Iwata, E. M. Kabuß, T. Kageya, A. Karev, H. J. Kessler, T. J. Ketel, A. Kishi, Y. Kisselev, L. Klostermann, D. Kramer, V. Krivokhijine, W. Kröger, J. Kyynäräinen, M. Lamanna, U. Landgraf, T. Layda, J. M. Le Goff, F. Lehar, A. de Lesquen, J. Lichtenstadt, M. Litmaath, S. Lopez-Ponte, M. Lowe, A. Magnon, G. K. Mallot, F. Marie, A. Martin, J. Martino, T. Matsuda, B. Mayes, J. S. McCarthy, K. Medved, G. van Middelkoop, D. Miller, K. Mori, J. Moromisato, A. Nagaitsev, J. Nassalski, L. Naumann, T. O. Niinikoski, J. E.J. Oberski, A. Ogawa, C. Ozben, A. Penzo, C. Perez, F. Perrot-Kunne, D. Peshekhonov, R. Piegaia, L. Pinsky, S. Platchkov, M. Plo, D. Pose, H. Postma, J. Pretz, T. Pussieux, J. Pyrlik, I. Reyhancan, A. Rijllart, J. B. Roberts, S. Rock, M. Rodriguez, E. Rondio, A. Rosado, I. Sabo, J. Saborido, A. Sandacz, I. Savin, P. Schiavon, K. P. Schüler, R. Segel, R. Seitz, Y. Semertzidis, S. Sergeev, F. Sever, P. Shanahan, E. P. Sichtermann, G. I. Smirnov, A. Staude, A. Steinmetz, U. Stiegler, H. Stuhrmann, M. Szleper, K. M. Teichert, F. Tessarotto, M. Velasco, J. Vogt, R. Voss, R. Weinstein, C. Whitten, R. Windmolders, R. Willumeit, W. Wislicki, A. Witzmann, A. M. Zanetti, J. Zhao

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

114 Citations (Scopus)

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. 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.

Original languageEnglish
Pages (from-to)93-100
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume369
Issue number1
DOIs
Publication statusPublished - 15 Feb 1996
Externally publishedYes

Funding

1 Permanenta ddress:U niversity of California, Instituteo f Particle Physics, Santa Cmz, 95064 CA, USA. 2 Permanenta ddress: University of Santiago, Departmento f Particle Physics, 15706 Santiago de Compostella, Spain. 3 Supportedb y the Bundesministeriumf ur Bildung, Wissenschaft, Forschung und Technologie. 4 Partially supported by TUBITAK and the Centre for Turkish-Balkan Physics Research and Application (Bogazici University). 5 Supported by the U.S. Departmento f Energy. 6 Supported by the U.S. National Science Foundation. 7 Supported by Ishida Foundation, Mitsubishi Foundation and Monbusho International Science Research Program. 8 Supported by the National Science Foundation (NWO) of the Netherlands. g Supported by the Commissariat a 1’Energie Atomique. lo Supported by Comision Interministerial de Ciencia y Tecnologia. 11S upported by the Israel Science Foundation. l2 Supported by the KBN SPUB/P3/209/94. l3 Supported by Xunta de Galicia. l4 Deceased.

FundersFunder number
Bogazici University
Centre for Turkish-Balkan Physics Research and Application
Commissariat a 1’Energie Atomique
Ishida Foundation
KBNSPUB/P3/209/94
Monbusho International Science Research Program
TUBITAK
U.S. Departmento f Energy
National Science Foundation
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Mitsubishi Foundation
Comisión Interministerial de Ciencia y Tecnología
Xunta de Galicia

    Fingerprint

    Dive into the research topics of 'Polarisation of valence and non-strange sea quarks in the nucleon from semi-inclusive spin asymmetries'. Together they form a unique fingerprint.

    Cite this