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First measurement of transverse-spin-dependent azimuthal asymmetries in the Drell-Yan process

2017-09-12Journal article Open access
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dc.contributor.authorCOMPASS collaboration (219 authors)
dc.contributor.authorBordalo, P.
dc.contributor.authorFranco, C.
dc.contributor.authorNunes, A.S.
dc.contributor.authorQuaresma, M.
dc.contributor.authorQuintans, C.
dc.contributor.authorRamos, S.
dc.contributor.authorSilva, L.
dc.contributor.authorStolarski, M.
dc.date.accessioned2019-02-04T12:41:46Z
dc.date.available2019-02-04T12:41:46Z
dc.date.issued2017-09-12
dc.date.updated2019-02-04T12:41:46Z
dc.description.abstractThe first measurement of transverse-spin-dependent azimuthal asymmetries in the pion-induced Drell-Yan (DY) process is reported. We use the CERN SPS 190  GeV/c π- beam and a transversely polarized ammonia target. Three azimuthal asymmetries giving access to different transverse-momentum-dependent (TMD) parton distribution functions (PDFs) are extracted using dimuon events with invariant mass between 4.3  GeV/c2 and 8.5  GeV/c2. Within the experimental uncertainties, the observed sign of the Sivers asymmetry is found to be consistent with the fundamental prediction of quantum chromodynamics (QCD) that the Sivers TMD PDFs extracted from DY have a sign opposite to the one extracted from semi-inclusive deep-inelastic scattering (SIDIS) data. We present two other asymmetries originating from the pion Boer-Mulders TMD PDFs convoluted with either the nucleon transversity or pretzelosity TMD PDFs. A recent COMPASS SIDIS measurement was obtained at a hard scale comparable to that of these DY results. This opens the way for possible tests of fundamental QCD universality predictions.
dc.description.versionPeer Reviewed
dc.identifierPhys.Rev.Lett. 119 (2017) 112002; DOI 10.1103/PhysRevLett.119.112002
dc.identifier.urihttp://dx.doi.org/10.1103/PhysRevLett.119.112002
dc.identifier.urihttp://hdl.handle.net/10400.26/27320
dc.language.isoeng
dc.titleFirst measurement of transverse-spin-dependent azimuthal asymmetries in the Drell-Yan process
dc.typejournal article
dspace.entity.typePublication
rcaap.rightsopenAccesspt
rcaap.typearticle

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