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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F17%3A00480217" target="_blank" >RIV/68081731:_____/17:00480217 - isvavai.cz</a>

Alternative codes found

RIV/68407700:21340/17:00311370 RIV/00216208:11320/17:10369357 RIV/46747885:24510/17:00005281

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>

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 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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10304 - Nuclear physics

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

European Physical Journal C

ISSN

1434-6044

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

1-12

UT code for WoS article

000399153900002

EID of the result in the Scopus database

2-s2.0-85016958819