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First Measurement of Transverse-Spin-Dependent Azimuthal Asymmetries in the Drell-Yan Process
Ist Nazl Fis Nucl, Trieste Sect, I-34127 Trieste, Italy..
Joint Inst Nucl Res, Moscow 141980, Russia..
Joint Inst Nucl Res, Moscow 141980, Russia..
Univ Turin, Dept Phys, I-10125 Turin, Italy..
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2017 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 119, no 11, article id 112002Article in journal (Refereed) Published
Abstract [en]

The 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 pi(-) 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/c(2) and 8.5 GeV/c(2). 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.

Place, publisher, year, edition, pages
2017. Vol. 119, no 11, article id 112002
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Accelerator Physics and Instrumentation
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URN: urn:nbn:se:uu:diva-335194DOI: 10.1103/PhysRevLett.119.112002ISI: 000410458800005OAI: oai:DiVA.org:uu-335194DiVA, id: diva2:1163236
Available from: 2017-12-06 Created: 2017-12-06 Last updated: 2017-12-06Bibliographically approved

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