Accès ouvert déclaré
2023
preprint
Final COMPASS results on the transverse-spin-dependent azimuthal asymmetries in the pion-induced Drell-Yan process
G. D. Alexeev, M. Alexeev, C. Alice, A. Amoroso, V. Andrieux, V. Anosov, K. Augsten, W. Augustyniak, C.D.R. Azevedo, B. Badełek, J. Barth, R. Beck, J. Beckers, Y. Bedfer, J. Bernhard, M. Bodlak, F. Bradamante, A. Bressan, W. C. Chang, C. Chatterjee, M. Chiosso, А. Г. Чумаков, S. -U. Chung, A. Cicuttin, P. M. M. Correia, M.L. Crespo, D. D’Ago, S. Dalla Torre, S. Dasgupta, Filippo Delcarro, I. Denisenko, О. Денисов, S.V. Donskov, N. Doshita, Ch. Dreisbach, W. Dünnweber, R. R. Dusaev, D. Ecker, D. Eremeev, P. Faccioli, M. Faessler, М. Фингер, H. Fischer, K.J. Flöthner, W. Florian, V. Frolov, L. G. Garcia Ordonez, F. Gautheron, O.P. Gavrichtchouk, S. Gerassimov, J. Giarra, D. Giordano, A. Gridin, M. Große Perdekamp, B. Grube, Markus E. Gruner, A. Guskov, P.A. Haas, D. von Harrach, R. Heitz, M. Hoffmann, N. d’Hose, C. -Y. Hsieh, S. Huber, S. Ishimoto, A. Ivanov, T. Iwata, V. Jary, R. Joosten, E. Kabuß, F. Kaspar, A. Kerbizi, B. Ketzer, A. Khatun, G.V. Khaustov, Ф. Клейн, J.H. Koivuniemi, V. N. Kolosov, K. Kondo Horikawa, I. Konorov, В.Ф. Константинов, A. Korzenev, A.M. Kotzinian, O. Kouznetsov, Zdeněk Král, F. Krinner, F. Kunne, K. Kurek, R. Kurjata, A. Kveton, K. Lavickova, S. Levorato, Y. -S. Lian, J. Lichtenstadt, P. -J. Lin, R. Longo, Valery E. Lyubovitskij, A. Maggiora, A. Magnon, N. Makke, G.K. Mallot, A. Maltsev, A. Martin, J. Marzec, J. Matoušek, T. Matsuda, G. Mattson, C. Menezes Pires, F. Metzger, Mareike Meyer, W. Meyer, Yu.V. Mikhailov, M. Mikhasenko, E. Mitrofanov, Daisuke Miura, Y. Miyachi, Romina Molina, A. Nagaytsev, D. Neyret, M. Niemiec, J. Nový, W.‐D. Nowak, G. Nukazuka, А.G. Оlshevsky, M. Ostrick, D. Panzieri, B. Parsamyan, S. Paul, H. Pekeler, J.-C. Peng, M. Pešek, D. V. Peshekhonov, M. Pešková, S. Platchkov, J. Pochodzalla, V. A. Polyakov, M. Quaresma, C. Quintans, G. Reicherz, D.I. Ryabchikov, A. Rychter, V. D. Samoylenko, A. Sandacz, S. Sarkar, T. Savada, I. Savin, G. Sbrizzai, H. Schmieden, A. Selyunin, Konstantin Sharko, L. Sinha, D. Spülbeck, A. Srnka, M. Stolarski, M. Šulc, H. Suzuki, S. Tessaro, F. Tessarotto, A. Thiel, F. Tosello, Triloki Triloki, V. Tskhay, B.M. Veit, J.F.C.A. Veloso, B. Ventura, Miroslav Virius, M. Wagner, S. Wallner, К. Заремба, M. Zavertyaev, M. Zemko, M. Ziembicki
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Le résumé fourni par la source
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 polarised ammonia target. Combining the data of both years, we present final results on the amplitudes of the five azimuthal modulations in the dimuon production cross section. Three of these transverse-spin-dependent azimuthal asymmetries (TSAs) 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 semi-inclusive measurements of 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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Les sujets associés
Particle physics theoretical and experimental studiesHigh-Energy Particle Collisions ResearchQuantum Chromodynamics and Particle Interactions