Polarised quark distributions in the nucleon from semi-inclusive spin asymmetries
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 and Q2 > 1 GeV2. Compared to our previous publication on th...
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1998
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v420_n1-2_p180_Adeva http://hdl.handle.net/20.500.12110/paper_03702693_v420_n1-2_p180_Adeva |
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paper:paper_03702693_v420_n1-2_p180_Adeva2023-06-08T15:36:36Z Polarised quark distributions in the nucleon from semi-inclusive spin asymmetries 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 and Q2 > 1 GeV2. 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 Q2 = 10 GeV2. The polarised u valence quark distribution, Δuυ(×), is positive and the polarisation increases with x. The polarised d valence quark distribution, Δdυ(x), is negative and the non-strange sea distribution, Δq-(x), is consistent with zero over the measured range of x. We find for the first moments (latin small letter esh)10Δuυ(x)d x = 0.77 ± 0.10 ± 0.08, (latin small letter esh)10Δdυ(x)d x = -0.52 ± 0.14 ± 0.09 and (latin small letter esh)10Δq-(x)d x = 0.01 ± 0.04 ± 0.03, where we assumed Δu-(x) = Δd-(x). We also determine for the first time the second moments of the valence distributions (latin small letter esh)10xΔqυ(x)d x. © 1998 Published by Elsevier Science B.V. 1998 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v420_n1-2_p180_Adeva http://hdl.handle.net/20.500.12110/paper_03702693_v420_n1-2_p180_Adeva |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| description |
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 and Q2 > 1 GeV2. 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 Q2 = 10 GeV2. The polarised u valence quark distribution, Δuυ(×), is positive and the polarisation increases with x. The polarised d valence quark distribution, Δdυ(x), is negative and the non-strange sea distribution, Δq-(x), is consistent with zero over the measured range of x. We find for the first moments (latin small letter esh)10Δuυ(x)d x = 0.77 ± 0.10 ± 0.08, (latin small letter esh)10Δdυ(x)d x = -0.52 ± 0.14 ± 0.09 and (latin small letter esh)10Δq-(x)d x = 0.01 ± 0.04 ± 0.03, where we assumed Δu-(x) = Δd-(x). We also determine for the first time the second moments of the valence distributions (latin small letter esh)10xΔqυ(x)d x. © 1998 Published by Elsevier Science B.V. |
| title |
Polarised quark distributions in the nucleon from semi-inclusive spin asymmetries |
| spellingShingle |
Polarised quark distributions in the nucleon from semi-inclusive spin asymmetries |
| title_short |
Polarised quark distributions in the nucleon from semi-inclusive spin asymmetries |
| title_full |
Polarised quark distributions in the nucleon from semi-inclusive spin asymmetries |
| title_fullStr |
Polarised quark distributions in the nucleon from semi-inclusive spin asymmetries |
| title_full_unstemmed |
Polarised quark distributions in the nucleon from semi-inclusive spin asymmetries |
| title_sort |
polarised quark distributions in the nucleon from semi-inclusive spin asymmetries |
| publishDate |
1998 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03702693_v420_n1-2_p180_Adeva http://hdl.handle.net/20.500.12110/paper_03702693_v420_n1-2_p180_Adeva |
| _version_ |
1768544275705888768 |