Final COMPASS results on the transverse-spin-dependent azimuthal asymmetries in the pion-induced Drell-Yan process
Abstract
The COMPASS Collaboration performed measurements of the Drell-Yan process in 2015 and 2018 using a 190 GeV/c 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.
Cite
@article{arxiv.2312.17379,
title = {Final COMPASS results on the transverse-spin-dependent azimuthal asymmetries in the pion-induced Drell-Yan process},
author = {G. D. Alexeev and M. G. Alexeev and C. Alice and A. Amoroso and V. Andrieux and V. Anosov and K. Augsten and W. Augustyniak and C. D. R. Azevedo and B. Badelek and J. Barth and R. Beck and J. Beckers and Y. Bedfer and J. Bernhard and M. Bodlak and F. Bradamante and A. Bressan and W. -C. Chang and C. Chatterjee and M. Chiosso and A. G. Chumakov and S. -U. Chung and A. Cicuttin and P. M. M. Correia and M. L. Crespo and D. D'Ago and S. Dalla Torre and S. S. Dasgupta and S. Dasgupta and F. Delcarro and I. Denisenko and O. Yu. Denisov and S. V. Donskov and N. Doshita and Ch. Dreisbach and W. Dunnweber and R. R. Dusaev and D. Ecker and D. Eremeev and P. Faccioli and M. Faessler and M. Finger and M. Finger and H. Fischer and K. J. Flothner and W. Florian and J. M. Friedrich and V. Frolov and L. G. Garcia Ordonez and F. Gautheron and O. P. Gavrichtchouk and S. Gerassimov and J. Giarra and D. Giordano and A. Grasso and A. Gridin and M. Grosse Perdekamp and B. Grube and M. Gruner and A. Guskov and P. Haas and D. von Harrach and R. Heitz and M. Hoffmann and N. d'Hose and C. -Y. Hsieh and S. Huber and S. Ishimoto and A. Ivanov and T. Iwata and V. Jary and R. Joosten and E. Kabuss and F. Kaspar and A. Kerbizi and B. Ketzer and A. Khatun and G. V. Khaustov and F. Klein and J. H. Koivuniemi and V. N. Kolosov and K. Kondo Horikawa and I. Konorov and V. F. Konstantinov and A. Yu. Korzenev and A. M. Kotzinian and O. M. Kouznetsov and A. Koval and Z. Kral and F. Krinner and F. Kunne and K. Kurek and R. P. Kurjata and A. Kveton and K. Lavickova and S. Levorato and Y. -S. Lian and J. Lichtenstadt and P. -J. Lin and R. Longo and V. E. Lyubovitskij and A. Maggiora and A. Magnon and N. Makke and G. K. Mallot and A. Maltsev and A. Martin and J. Marzec and J. Matousek and T. Matsuda and G. Mattson and C. Menezes Pires and F. Metzger and M. Meyer and W. Meyer and Yu. V. Mikhailov and M. Mikhasenko and E. Mitrofanov and D. Miura and Y. Miyachi and R. Molina and A. Moretti and A. Nagaytsev and D. Neyret and M. Niemiec and J. Novy and W. -D. Nowak and G. Nukazuka and A. G. Olshevsky and M. Ostrick and D. Panzieri and B. Parsamyan and S. Paul and H. Pekeler and J. -C. Peng and M. Pesek and D. V. Peshekhonov and M. Peskova and S. Platchkov and J. Pochodzalla and V. A. Polyakov and M. Quaresma and C. Quintans and G. Reicherz and C. Riedl and D. I. Ryabchikov and A. Rychter and A. Rymbekova and V. D. Samoylenko and A. Sandacz and S. Sarkar and T. Savada and I. A. Savin and G. Sbrizzai and H. Schmieden and A. Selyunin and K. Sharko and L. Sinha and D. Spulbeck and A. Srnka and M. Stolarski and M. Sulc and H. Suzuki and S. Tessaro and F. Tessarotto and A. Thiel and F. Tosello and A. Townsend and T. Triloki and V. Tskhay and B. Valinoti and B. M. Veit and J. F. C. A. Veloso and B. Ventura and A. Vijayakumar and M. Virius and M. Wagner and S. Wallner and K. Zaremba and M. Zavertyaev and M. Zemko and E. Zemlyanichkina and M. Ziembicki},
journal= {arXiv preprint arXiv:2312.17379},
year = {2024}
}