Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Leading-order determination of the gluon polarisation from semi-inclusive deep inelastic scattering data
Univ Erlangen Nurnberg, Phys Inst, D-91054 Erlangen, Germany..
Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy..
Joint Inst Nucl Res, Dubna 141980, Moscow Region, Russia..
Univ Turin, Dept Phys, I-10125 Turin, Italy..
Show others and affiliations
2017 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 77, no 4, 209Article in journal (Refereed) Published
Abstract [en]

Using a novel analysis technique, the gluon polarisation in the nucleon is re-evaluated using the longitudinal double-spin asymmetry measured in the cross section of semi-inclusive single-hadron muoproduction with photon virtuality Q(2) > 1 ( GeV/c)(2). The data were obtained by the COMPASS experiment at CERN using a 160 GeV/c polarised muon beam impinging on a polarised (LiD)-Li-6 target. By analysing the full range in hadron transverse momentum p(T), the different pT-dependences of the underlying processes are separated using a neural-network approach. In the absence of pQCD calculations at next-to-leading order in the selected kinematic domain, the gluon polarisation Delta g/g is evaluated at leading order in pQCD at a hard scale of mu(2) = < Q(2) > = 3( GeV/c)(2). It is determined in three intervals of the nucleon momentum fraction carried by gluons, x(g), covering the range 0.04< x(g)< 0.28 and does not exhibit a significant dependence on xg. The average over the three intervals, < Delta g/g > = 0.113 +/- 0.038(stat) +/- 0.036( syst) at < x(g) > approximate to 0.10, suggests that the gluon polarisation is positive in the measured x(g) range.

Place, publisher, year, edition, pages
SPRINGER , 2017. Vol. 77, no 4, 209
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-321843DOI: 10.1140/epjc/s10052-017-4716-xISI: 000399153900002OAI: oai:DiVA.org:uu-321843DiVA: diva2:1095701
Available from: 2017-05-15 Created: 2017-05-15 Last updated: 2017-05-15Bibliographically approved

Open Access in DiVA

fulltext(814 kB)38 downloads
File information
File name FULLTEXT01.pdfFile size 814 kBChecksum SHA-512
4bb5765556c68aa7e6c5736f43266da5f3674840e2da3a24c3ea6d80417ed8da71d63b2386111da7a3bd9407d4ba453c0ac419b268cae4276bec9a47c0799262
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Search in DiVA

By author/editor
Schönning, Karin
By organisation
Nuclear Physics
In the same journal
European Physical Journal C
Subatomic Physics

Search outside of DiVA

GoogleGoogle Scholar
Total: 38 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 349 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf