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Leading-order determination of the gluon polarisation from semi-inclusive deep inelastic scattering data

descriptionPublicationkeyboard_double_arrow_right Article , Preprint 01 Apr 2017Embargo end date: 01 Jan 2015 Italy, Sweden, Portugal, Germany, France English Publisher:Springer Science and Business Media LLCJournal:The European Physical Journal C, volume 77 (issn: 1434-6044, eissn: 1434-6052, Copyright policy )Funded by:FCT | Collaboration in the COMP..., EC | HADRONPHYSICS3
Authors: C. Adolph; M. Aghasyan; R. Akhunzyanov; M. G. Alexeev; G. D. Alexeev; A. Amoroso; V. Andrieux; +193 Authors
APC: 168.57 EUR

doi: 10.1140/epjc/s10052-017-4716-x , 10.48550/arxiv.1512.05053 , 10.18154/rwth-2017-04329

arXiv: 1512.05053

handle: 11368/2919171 , 10400.26/26993 , 2318/1958551 , 11579/90951

Leading-order determination of the gluon polarisation from semi-inclusive deep inelastic scattering data

Abstract

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 $Q^2>1~({\rm GeV}/c)^2$. 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 $p_{\rm T}$, the different $p_{\rm T}$-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 $��g/g$ is evaluated at leading order in pQCD at a hard scale of $��^2= \langle Q^2 \rangle = 3 ({\rm GeV}/c)^2$. It is determined in three intervals of the nucleon momentum fraction carried by gluons, $x_{\rm g}$, covering the range $0.04 \!

14 pages, 6 figures

Countries
Italy, Sweden, Portugal, Germany, France
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Keywords

data analysis method, CERN Lab, muon+: polarized beam, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics and Astronomy (miscellaneous), neural network, polarization: longitudinal, FOS: Physical sciences, QC770-798, Astrophysics, gluon: polarization, hadron: transverse momentum, transverse momentum dependence, 530, COMPASS, Monte Carlo Model, nucleon: momentum, Systematic Uncertainty, High Energy Physics - Experiment, Subatomär fysik, High Energy Physics - Experiment (hep-ex), High Energy Physics - Phenomenology (hep-ph), Transverse Momentum, Nuclear and particle physics. Atomic energy. Radioactivity, Subatomic Physics, info:eu-repo/classification/ddc/530, Engineering (miscellaneous); Physics and Astronomy (miscellaneous), Monte Carlo, Engineering (miscellaneous), 160 GeV/c, CERN SPS, hadron: photoproduction, Parton Shower, [PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], QB460-466, semi-inclusive reaction, High Energy Physics - Phenomenology, muon nucleus: inclusive reaction, beam: scattering, spin: asymmetry, experimental results

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
14
Top 10%
Average
Top 10%
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gold
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