Leading-order determination of the gluon polarisation from semi-inclusive deep inelastic scattering data
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F46747885%3A24510%2F17%3A00005281" target="_blank" >RIV/46747885:24510/17:00005281 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1140/epjc/s10052-017-4716-x" target="_blank" >http://dx.doi.org/10.1140/epjc/s10052-017-4716-x</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1140/epjc/s10052-017-4716-x" target="_blank" >10.1140/epjc/s10052-017-4716-x</a>
Alternative languages
Result language
angličtina
Original language name
Leading-order determination of the gluon polarisation from semi-inclusive deep inelastic scattering data
Original language description
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 Q2 > 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 6 LiD target. By analysing the full range in hadron transverse momentum p T , the different p T -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 Δ g/ g is evaluated at leading order in pQCD at a hard scale of μ 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 < xg < 0.28 and does not exhibit a significant dependence on x g . The average over the three intervals, ⟨ Δ g/ g⟩ = 0.113 ± 0. 038 (stat.) ± 0. 036 (syst.) at ⟨ x g ⟩ ≈ 0.10 , suggests that the gluon polarisation is positive in the measured x g range.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics
Result continuities
Project
<a href="/en/project/LG13031" target="_blank" >LG13031: Collaboration of the Czech Republic with CERN</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
European Physical Journal C
ISSN
1434-6052
e-ISSN
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Volume of the periodical
77
Issue of the periodical within the volume
4
Country of publishing house
DE - GERMANY
Number of pages
12
Pages from-to
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UT code for WoS article
000399153900002
EID of the result in the Scopus database
2-s2.0-85016958819