Publication
The spin structure of the proton at low $x$ and low $Q^2$ in two-dimensional bins from COMPASS
| dc.contributor.author | Nunes, A.S. | |
| dc.date.accessioned | 2019-02-04T10:29:01Z | |
| dc.date.available | 2019-02-04T10:29:01Z | |
| dc.date.issued | 2016-10-06 | |
| dc.date.updated | 2019-02-04T10:29:01Z | |
| dc.description.abstract | The longitudinal double spin asymmetries $A_1^p$ and the spin dependent structure function of the proton $g_1^p$ were extracted from COMPASS data in the region of low Bjorken scaling variable $x$ and low photon virtuality $Q^2$. The data were taken in 2007 and 2011 from scattering of polarised muons off polarised protons, resulting in a sample that is 150 times larger than the one from the previous experiment SMC that pioneered studies in this kinematic region. For the first time, $A_1^p$ and $g_1^p$ were evaluated in this region in two-dimensional bins of kinematic variables: $(x,Q^2)$, $(\nu ,Q^2)$, $(x,\nu)$ and $(Q^2,x)$. The following kinematic region was investigated: $4\times 10^{-5}<x<4\times 10^{-2}$, $0.001$~(GeV/$c$)$^2<Q^2<1$~(GeV/$c$)$^2$ and $14$~GeV$<\nu <194$~GeV. The obtained results were confronted with theoretical models. | |
| dc.description.version | Peer Reviewed | |
| dc.identifier | PoS DIS2016 (2016) 229; DOI 10.22323/1.265.0229 | |
| dc.identifier.uri | http://dx.doi.org/10.22323/1.265.0229 | |
| dc.identifier.uri | http://hdl.handle.net/10400.26/27126 | |
| dc.language.iso | eng | |
| dc.title | The spin structure of the proton at low $x$ and low $Q^2$ in two-dimensional bins from COMPASS | |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| rcaap.rights | openAccess | pt |
| rcaap.type | article |