Final COMPASS Results on the Transverse-Spin-Dependent Azimuthal Asymmetries in the Pion-Induced Drell-Yan Process
Affiliations
- 1 Affiliated with an international laboratory covered by a cooperation agreement with CERN.
- 2 Torino Section of INFN, 10125 Torino, Italy.
- 3 University of Torino, Dept. of Physics, 10125 Torino, Italy.
- 4 University of Illinois at Urbana-Champaign, Dept. of Physics, Urbana, Illinois 61801-3080, USA.
- 5 Czech Technical University in Prague, 16636 Prague, Czech Republic.
- 6 National Centre for Nuclear Research, 02-093 Warsaw, Poland.
- 7 University of Aveiro, I3N, Dept. of Physics, 3810-193 Aveiro, Portugal.
- 8 University of Warsaw, Faculty of Physics, 02-093 Warsaw, Poland.
- 9 Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, 53115 Bonn, Germany.
- 10 Technische Universität München, Physik Dept., 85748 Garching, Germany.
- 11 IRFU, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France.
- 12 CERN, 1211 Geneva 23, Switzerland.
- 13 Charles University, Faculty of Mathematics and Physics, 12116 Prague, Czech Republic.
- 14 Trieste Section of INFN, 34127 Trieste, Italy.
- 15 University of Trieste, Dept. of Physics, 34127 Trieste, Italy.
- 16 Academia Sinica, Institute of Physics, Taipei 11529, Taiwan.
- 17 Affiliated with an institute covered by a cooperation agreement with CERN.
- 18 Abdus Salam ICTP, 34151 Trieste, Italy.
- 19 Matrivani Institute of Experimental Research & Education, Calcutta-700 030, India.
- 20 Yamagata University, Yamagata 992-8510, Japan.
- 21 Ludwig-Maximilians-Universität, 80539 München, Germany.
- 22 LIP, 1649-003 Lisbon, Portugal.
- 23 Universität Freiburg, Physikalisches Institut, 79104 Freiburg, Germany.
- 24 Universität Bochum, Institut für Experimentalphysik, 44780 Bochum, Germany.
- 25 Universität Mainz, Institut für Kernphysik, 55099 Mainz, Germany.
- 26 Universität Bonn, Physikalisches Institut, 53115 Bonn, Germany.
- 27 A.I. Alikhanyan National Science Laboratory, 2 Alikhanyan Br. Street, 0036, Yerevan, Armenia.
- 28 Warsaw University of Technology, Institute of Radioelectronics, 00-665 Warsaw, Poland.
- 29 Tel Aviv University, School of Physics and Astronomy, 69978 Tel Aviv, Israel.
- 30 Center for High Energy and High Field Physics and Dept. of Physics, National Central University, 300 Zhongda Rd., Zhongli 320317, Taiwan.
- 31 University of Miyazaki, Miyazaki 889-2192, Japan.
- 32 Institute of Scientific Instruments of the CAS, 61264 Brno, Czech Republic.
- 33 Technical University in Liberec, 46117 Liberec, Czech Republic.
- PMID: 39213572
- DOI: 10.1103/PhysRevLett.133.071902
Final COMPASS Results on the Transverse-Spin-Dependent Azimuthal Asymmetries in the Pion-Induced Drell-Yan Process
Authors
Affiliations
- 1 Affiliated with an international laboratory covered by a cooperation agreement with CERN.
- 2 Torino Section of INFN, 10125 Torino, Italy.
- 3 University of Torino, Dept. of Physics, 10125 Torino, Italy.
- 4 University of Illinois at Urbana-Champaign, Dept. of Physics, Urbana, Illinois 61801-3080, USA.
- 5 Czech Technical University in Prague, 16636 Prague, Czech Republic.
- 6 National Centre for Nuclear Research, 02-093 Warsaw, Poland.
- 7 University of Aveiro, I3N, Dept. of Physics, 3810-193 Aveiro, Portugal.
- 8 University of Warsaw, Faculty of Physics, 02-093 Warsaw, Poland.
- 9 Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, 53115 Bonn, Germany.
- 10 Technische Universität München, Physik Dept., 85748 Garching, Germany.
- 11 IRFU, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France.
- 12 CERN, 1211 Geneva 23, Switzerland.
- 13 Charles University, Faculty of Mathematics and Physics, 12116 Prague, Czech Republic.
- 14 Trieste Section of INFN, 34127 Trieste, Italy.
- 15 University of Trieste, Dept. of Physics, 34127 Trieste, Italy.
- 16 Academia Sinica, Institute of Physics, Taipei 11529, Taiwan.
- 17 Affiliated with an institute covered by a cooperation agreement with CERN.
- 18 Abdus Salam ICTP, 34151 Trieste, Italy.
- 19 Matrivani Institute of Experimental Research & Education, Calcutta-700 030, India.
- 20 Yamagata University, Yamagata 992-8510, Japan.
- 21 Ludwig-Maximilians-Universität, 80539 München, Germany.
- 22 LIP, 1649-003 Lisbon, Portugal.
- 23 Universität Freiburg, Physikalisches Institut, 79104 Freiburg, Germany.
- 24 Universität Bochum, Institut für Experimentalphysik, 44780 Bochum, Germany.
- 25 Universität Mainz, Institut für Kernphysik, 55099 Mainz, Germany.
- 26 Universität Bonn, Physikalisches Institut, 53115 Bonn, Germany.
- 27 A.I. Alikhanyan National Science Laboratory, 2 Alikhanyan Br. Street, 0036, Yerevan, Armenia.
- 28 Warsaw University of Technology, Institute of Radioelectronics, 00-665 Warsaw, Poland.
- 29 Tel Aviv University, School of Physics and Astronomy, 69978 Tel Aviv, Israel.
- 30 Center for High Energy and High Field Physics and Dept. of Physics, National Central University, 300 Zhongda Rd., Zhongli 320317, Taiwan.
- 31 University of Miyazaki, Miyazaki 889-2192, Japan.
- 32 Institute of Scientific Instruments of the CAS, 61264 Brno, Czech Republic.
- 33 Technical University in Liberec, 46117 Liberec, Czech Republic.
- PMID: 39213572
- DOI: 10.1103/PhysRevLett.133.071902
Abstract
The COMPASS Collaboration performed measurements of the Drell-Yan process in 2015 and 2018 using a 190 GeV/c π^{-} beam impinging on a transversely polarized ammonia target. Combining the data of both years, we present final results on the amplitudes of five azimuthal modulations, which correspond to transverse-spin-dependent azimuthal asymmetries (TSAs) in the dimuon production cross section. Three of them probe the nucleon leading-twist Sivers, transversity, and pretzelosity transverse-momentum dependent (TMD) parton distribution functions (PDFs). The other two are induced by subleading effects. These TSAs provide unique new inputs for the study of the nucleon TMD PDFs and their universality properties. In particular, the Sivers TSA observed in this measurement is consistent with the fundamental QCD prediction of a sign change of naive time-reversal-odd TMD PDFs when comparing the Drell-Yan process with deep inelastic scattering. Also, within the context of model predictions, the observed transversity TSA is consistent with the expectation of a sign change for the Boer-Mulders function.
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