Journal
4TH INTERNATIONAL WORKSHOP ON TRANSVERSE POLARISATION PHENOMENA IN HARD PROCESSES (TRANSVERSITY 2014)
Volume 85, Issue -, Pages -Publisher
E D P SCIENCES
DOI: 10.1051/epjconf/20158502006
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Sivers effect for gluons is connected to gluon orbital angular momentum which may be the missing part of the nucleon spin puzzle. We present a method of extraction of Sivers effect for gluons from COMPASS SIDIS data on transversely polarised target. In order to access the Sivers effect for gluons photon-gluon fusion (PGF) process is used. To enhance the fraction of PGF in the sample high-p(T) hadron pair events are selected. The method is based on a assumption that there are 3 processes contributing to the muon-nucleon scattering: PGF, leading process and QCD Compton process. Then one performs a weighting procedure which enables to extract the asymmetries for the 3 contributing processes simultaneously. In order to do that a neural network trained by a Monte Carlo to assign to each event 3 probabilities corresponding to the 3 processes is needed. Finaly we show results of Sivers effect for gluons extraction on COMPASS data with transversely polarised deuteron target. A(PGF)(sin phi 2h-phi S) = -0.14 +/- 0.15(stat.) at < x(G)> = 0.126.
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