First measurement of the Sivers asymmetry for gluons using SIDIS data
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F17%3A00480678" target="_blank" >RIV/68081731:_____/17:00480678 - isvavai.cz</a>
Alternative codes found
RIV/68407700:21340/17:00312739 RIV/46747885:24510/17:00005271 RIV/00216208:11320/17:10369200
Result on the web
<a href="http://dx.doi.org/10.1016/j.physletb.2017.07.018" target="_blank" >http://dx.doi.org/10.1016/j.physletb.2017.07.018</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.physletb.2017.07.018" target="_blank" >10.1016/j.physletb.2017.07.018</a>
Alternative languages
Result language
angličtina
Original language name
First measurement of the Sivers asymmetry for gluons using SIDIS data
Original language description
The Sivers function describes the correlation between the transverse spin of a nucleon and the transverse motion of its partons. For quarks, it was studied in previous measurements of the azimuthal asymmetry of hadrons produced in semi-inclusive deep inelastic scattering of leptons off transversely polarised nucleon targets, and it was found to be non-zero. In this letter the evaluation of the Sivers asymmetry for gluons is presented. The contribution of the photon-gluon fusion subprocess is enhanced by requiring two high transverse-momentum hadrons. The analysis method is based on a Monte Carlo simulation that includes three hard processes: photon-gluon fusion, QCD Compton scattering and the leading-order virtual-photon absorption process. The Sivers asymmetries of the three processes are simultaneously extracted using the LEPTO event generator and a neural network approach. The method is applied to samples of events containing at least two hadrons with large transverse momentum from the COMPASS data taken with a 160 GeV/c muon beam scattered off transversely polarised deuterons and protons. With a significance of about two standard deviations, a negative value is obtained for the gluon Sivers asymmetry. The result of a similar analysis for a Collins-like asymmetry for gluons is consistent with zero.
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
10304 - Nuclear physics
Result continuities
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
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
Physics Letters. B
ISSN
0370-2693
e-ISSN
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Volume of the periodical
772
Issue of the periodical within the volume
SEP
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
11
Pages from-to
854-864
UT code for WoS article
000411369700120
EID of the result in the Scopus database
2-s2.0-85027275603