Résumé
We present a new measurement of the spin-dependent structure function g1d of the deuteron in deep inelastic scattering of 190 GeV polarised muons on polarised deuterons, in the kinematic range 0.003 < x < 0.7 and 1 GeV2 < Q2 < 60 GeV2. This structure function is found to be negative at small x. The first moment Γ1d=∫01g 1ddx evaluated at Q02 = 10 GeV2 is 0.034 ± 0.009 (stat.) ± 0.006 (syst.). This value is below the Ellis-Jaffe sum rule prediction by three standard deviations. Using our earlier determination of Γ1p, we obtain Γ1p - Γ1n = 0.199 ± 0.038 which agrees with the Bjorken sum rule.
| langue originale | Anglais |
|---|---|
| Pages (de - à) | 248-254 |
| Nombre de pages | 7 |
| journal | Physics Letters B |
| Volume | 357 |
| Numéro de publication | 1-2 |
| Les DOIs | |
| état | Publié - 31 août 1995 |
| Modification externe | Oui |
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