Publication
Longitudinal double-spin asymmetry $A_1^{\rm p}$ and spin-dependent structure function $g_1^{\rm p}$ of the proton at small values of $x$ and $Q^2$
| dc.contributor.author | COMPASS collaboration (226 authors) | |
| dc.contributor.author | Bordalo, P. | |
| dc.contributor.author | Franco, C. | |
| dc.contributor.author | Nunes, A.S. | |
| dc.contributor.author | Quaresma, M. | |
| dc.contributor.author | Quintans, C. | |
| dc.contributor.author | Ramos, S. | |
| dc.contributor.author | Silva, L. | |
| dc.contributor.author | Stolarski, M. | |
| dc.date.accessioned | 2019-02-05T15:13:30Z | |
| dc.date.available | 2019-02-05T15:13:30Z | |
| dc.date.issued | 2018-06-10 | |
| dc.date.updated | 2019-02-05T15:13:30Z | |
| dc.description.abstract | We present a precise measurement of the proton longitudinal double-spin asymmetry A1p and the proton spin-dependent structure function g1p at photon virtualities 0.006(GeV/c)2<Q2<1(GeV/c)2 in the Bjorken x range of 4×10−5<x<4×10−2 . The results are based on data collected by the COMPASS Collaboration at CERN using muon beam energies of 160GeV and 200GeV . The statistical precision is more than tenfold better than that of the previous measurement in this region. In the whole range of x , the measured values of A1p and g1p are found to be positive. It is for the first time that spin effects are found at such low values of x . | |
| dc.description.version | Peer Reviewed | |
| dc.identifier | Phys.Lett. B781 (2018) 464-472; DOI 10.1016/j.physletb.2018.03.044 | |
| dc.identifier.uri | http://dx.doi.org/10.1016/j.physletb.2018.03.044 | |
| dc.identifier.uri | http://hdl.handle.net/10400.26/27466 | |
| dc.language.iso | eng | |
| dc.relation | Study of Strongly Interacting Matter | |
| dc.title | Longitudinal double-spin asymmetry $A_1^{\rm p}$ and spin-dependent structure function $g_1^{\rm p}$ of the proton at small values of $x$ and $Q^2$ | |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.awardTitle | Study of Strongly Interacting Matter | |
| oaire.awardURI | info:eu-repo/grantAgreement/EC/FP7/283286/EU | |
| oaire.fundingStream | FP7 | |
| project.funder.identifier | http://doi.org/10.13039/501100008530 | |
| project.funder.name | European Commission | |
| rcaap.rights | openAccess | pt |
| rcaap.type | article | |
| relation.isProjectOfPublication | 6b9e675a-0fea-4dd7-ad0c-99afe186e037 | |
| relation.isProjectOfPublication.latestForDiscovery | 6b9e675a-0fea-4dd7-ad0c-99afe186e037 |