First measurement of the Sivers asymmetry for gluons using SIDIS data
- Adolph, C.
- Aghasyan, M.
- Akhunzyanov, R.
- Alexeeva, M. G.aa
- Alexeev, G. D.
- Amoroso, A.
- Andrieux, V.
- Anfimov, N. V.
- Anosov, V.
- Antoshkin, A.
- Augsten, K.
- Augustyniak, W.
- Austregesilo, A.
- Azevedo, C. D. R.
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- Balestra, F.
- Ball, M.
- Barth, J.
- Beck, R.
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- Bernhard, J.
- Bicker, K.
- Bielert, E. R.
- Birsa, R.
- Bodlak, M.
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- Bradamante, F.
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- Buechele, M.
- Chang, W. -C
- Chatterjee, C.
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- Crespo, M. L.
- Curiel, Q.
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- Dasgupta, S. S.
- Dasgupta, S.
- Denisov, O. Yu.
- Dhara, L.
- Donskov, S. V.
- Doshita, N.
- Dreisbach, Ch.
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- Duennweber, W.
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- Franco, C.
- von Hohenesche, N. du Fresne
- Friedrich, J. M.
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- Fuchey, E.
- Gautheron, F.
- Gavrichtchouk, O. P.
- Gerassimov, S.
- Giarra, J.
- Giordano, F.
- Gnesi, I.
- Gorzellik, M.
- Grabmueller, S.
- Grasso, A.
- Grosse Perdekamp, M.
- Grube, B.
- Grussenmeyer, T.
- Guskov, A.
- Haas, F.
- Hahne, D.
- Hamar, G.
- von Harrach, D.
- Heinsius, F. H.
- Heitz, R.
- Herrmann, F.
- Horikawa, N.
- d'Hose, N.
- Hsieh, C. -Y
- Huber, S.
- Ishimoto, S.
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- Ivanshin, Yu.
- Iwata, T.
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- Paul, S.
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- Schönning, Karin
- Seder, E.
- Selyunin, A.
- Silva, L.
- Sinha, L.
- Sirtl, S.
- Slunecka, M.
- Smolik, J.
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- Steffen, D.
- Stolarski, M.
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- Tasevsky, M.
- Tessaro, S.
- Tessarotto, F.
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- Thiel, A.
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- Tskhay, V.
- Uhl, S.
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- Veloso, J.
- Virius, M.
- Vondra, J.
- Wallner, S.
- Weisrock, T.
- Wilfert, M.
- ter Wolbeek, J.
- Zaremba, K.
- Zavada, P.
- Zavertyaev, M.
- Zemlyanichkina, E.
- Zhuravlev, N.
- Ziembicki, M.
- Zink, A.
DOIAbstract
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....
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