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First results on $A_1^p$ and $g_1^p$ at low x and low $Q^2$ from COMPASS
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The COMPASS experiment at CERN has collected a large sample of about 700 million events of quasi-real photoproduction in polarised m + scattering using a beam momentum of 160 GeV/ c in 2007 and 200 GeV/ c in 2011. The events have a Bjorken scaling variable in the range 4 10...