Abstract
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 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.
| Original language | English (US) |
|---|---|
| Article number | 112002 |
| Journal | Physical review letters |
| Volume | 119 |
| Issue number | 11 |
| DOIs | |
| State | Published - Sep 12 2017 |
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ASJC Scopus subject areas
- Physics and Astronomy(all)
Cite this
First Measurement of Transverse-Spin-Dependent Azimuthal Asymmetries in the Drell-Yan Process. / (COMPASS Collaboration).
In: Physical review letters, Vol. 119, No. 11, 112002, 12.09.2017.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - First Measurement of Transverse-Spin-Dependent Azimuthal Asymmetries in the Drell-Yan Process
AU - (COMPASS Collaboration)
AU - Aghasyan, M.
AU - Akhunzyanov, R.
AU - Alexeev, G. D.
AU - Alexeev, M. G.
AU - Amoroso, A.
AU - Andrieux, V.
AU - Anfimov, N. V.
AU - Anosov, V.
AU - Antoshkin, A.
AU - Augsten, K.
AU - Augustyniak, W.
AU - Austregesilo, A.
AU - Azevedo, C. D.R.
AU - Badełek, B.
AU - Balestra, F.
AU - Ball, M.
AU - Barth, J.
AU - Beck, R.
AU - Bedfer, Y.
AU - Bernhard, J.
AU - Bicker, K.
AU - Bielert, E. R.
AU - Birsa, R.
AU - Bodlak, M.
AU - Bordalo, P.
AU - Bradamante, F.
AU - Bressan, A.
AU - Büchele, M.
AU - Chang, W. C.
AU - Chatterjee, C.
AU - Chiosso, M.
AU - Choi, I.
AU - Chung, S. U.
AU - Cicuttin, A.
AU - Crespo, M. L.
AU - Dalla Torre, S.
AU - Dasgupta, S. S.
AU - Dasgupta, S.
AU - Denisov, O. Yu
AU - Dhara, L.
AU - Donskov, S. V.
AU - Doshita, N.
AU - Dreisbach, Ch
AU - Dünnweber, W.
AU - Dziewiecki, M.
AU - Efremov, A.
AU - Eversheim, P. D.
AU - Faessler, M.
AU - Ferrero, A.
AU - Finger, M.
PY - 2017/9/12
Y1 - 2017/9/12
N2 - 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 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.
AB - 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 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.
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U2 - 10.1103/PhysRevLett.119.112002
DO - 10.1103/PhysRevLett.119.112002
M3 - Article
AN - SCOPUS:85029894322
VL - 119
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 11
M1 - 112002
ER -