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 language | English (US) |
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Pages (from-to) | 93-100 |
Number of pages | 8 |
Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
Volume | 369 |
Issue number | 1 |
DOIs | |
State | Published - Feb 15 1996 |
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.
ASJC Scopus subject areas
- Nuclear and High Energy Physics