Journal
PHYSICAL REVIEW D
Volume 87, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.87.052018
Keywords
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Funding
- MEYS (Czech Republic) [ME492, LA242]
- CEA (France)
- P2I (France)
- ANR (France)
- BMBF
- DFG cluster of excellence Origin and Structure of the Universe''
- DFG Research Training Group Programme Physics at Hadron Accelerators'' (Germany) [1102]
- SAIL (CSR) (India)
- ISF (Israel)
- INFN (Italy)
- MEXT
- JSPS [18002006, 20540299, 18540281]
- Daiko and Yamada Foundation (Japan)
- NCN (Poland) [DEC-2011/01/M/ST2/02350]
- FCT COMPETE (Portugal)
- QREN (Portugal) [CERN/FP/109323/2009, CERN/FP/116376/2010, CERN/FP/123600/2011]
- CERN-RFBR (Russia) [08-0291009]
- Grants-in-Aid for Scientific Research [20540299, 18540281, 18002006] Funding Source: KAKEN
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The gluon polarization in the nucleon was measured using open charm production by scattering 160 GeV/c polarized muons off longitudinally polarized protons or deuterons. The data were taken by the COMPASS Collaboration between 2002 and 2007. A detailed account is given of the analysis method that includes the application of neural networks. Several decay channels of D-0 mesons are investigated. Longitudinal spin asymmetries of the D meson production cross sections are extracted in bins of D-0 transverse momentum and energy. At leading order QCD accuracy, the average gluon polarization is determined as Delta g/g (LO) = -0.06 +/- 0: 21(stat.) +/- 0. 08(syst.) at the scale mu(2) approximate to 13 (GeV/c)(2) and an average gluon momentum fraction x approximate to 0.11. The average gluon polarization is also obtained at next-to-leading order QCD accuracy as Delta g/g NLO = -0.13 +/- 0.15(stat.).+/- 0.15(syst.) at the scale mu(2) approximate to 13 (GeV/c)(2) and x approximate to 0.20. DOI:10.1103/PhysRevD.87.052018
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