Dihadron Transverse-Spin Asymmetries in Muon-Deuteron Deep-Inelastic Scattering
Abstract
In 2022, the COMPASS collaboration performed semi-inclusive measurements of deep-inelastic muon-scattering on a transversely polarised deuteron (6LiD) target. From these data, transverse-spin-dependent dihadron asymmetries are extracted using pairs of oppositely charged hadrons. These asymmetries are directly sensitive to the quark transversity distributions and provide an independent handle on these fundamental quantities with respect to the Collins asymmetries measured in single-hadron production. The present results significantly improve upon the previous COMPASS deuteron measurements, which were the only available deuteron data worldwide, and reach a statistical precision comparable to that of the existing proton results from COMPASS. A small but nonzero asymmetry is observed at large Bjorken-x, consistent with theoretical expectations. A point-by-point extraction of the valence-quark transversity distributions yields, in particular, a substantially improved determination of the d-quark transversity. These measurements represent a major step towards a complete flavour mapping of the transverse-spin structure of the nucleon.
Keywords
Cite
@article{arxiv.2512.22311,
title = {Dihadron Transverse-Spin Asymmetries in Muon-Deuteron Deep-Inelastic Scattering},
author = {G. D. Alexeev and M. G. Alexeev and C. Alice and A. Amoroso and V. Andrieux and V. Anosov and S. Asatryan and K. Augsten and W. Augustyniak and C. D. R. Azevedo and B. Badelek and R. Beck and J. Beckers and Y. Bedfer and V. Benesova and J. Bernhard and F. Bradamante and A. Bressan and W. -C . Chang and C. Chatterjee and M. Chiosso and S. -U. Chung and A. Cicuttin and M. L. Crespo and D. D'Ago and S. Dalla Torre and S. S. Dasgupta and S. Dasgupta and M. Dehpour and F. Delcarro and I. Denisenko and O. Yu. Denisov and S. V. Donskov and N. Doshita and Ch. Dreisbach and W. Dün nweber and R. R. Dusaev and D. Ecker and P. Faccioli and M. Faessler and M. Finger and M. Finger and H. Fischer and K. J. Flöthner and W. Florian and J. M. Friedrich and V. Frolov and L. G. Garcia Ordòñez and O. P. Gavrichtchouk and S. Gerassimov and J. Giarra and D. Giordan o and A. Grasso and A. Gridin and M. Grosse Perdekamp and B. Grube and M. Grüner and A. Guskov and P. Haas and D. von Harrach and M. Hoffmann and A. Hoghmrtsyan and N. d'Hose and C. -Y. Hsieh and S. Ishimoto and A. Ivanov and T. Iwata and V. Jary and E. Jelinkova and R. Joosten and E. Kabuß and F. Kaspar and A. Kerbizi and B. Ketzer and G. V. Khaustov and T. Klasek and J. H. Koivuniemi and V. N. Kolosov and K. Kondo Horikawa and I. Konorov and A. Yu. Korzenev and A. M. Kotzinian and O. M. Kouznetsov and A. Koval 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 N. Makke and G. K. Mallot and A. Maltsev and A. Martin and H. Marukyan and J. Marzec and J. Matoušek and T. Matsuda and C. Menezes Pires and F. Metzge r and W. Meyer and M. Mikhasenko and E. Mitrofanov and D. Miura and Y. Miyachi and R. Molina and A. Movsisian and A. Moretti and A. Nagaytsev and D. Neyret and M. Niemiec and J. Nový and W. -D. Nowak and G. Nukazuka and A. G. Olshevsky and M. Ostrick and D. Panzieri and B. Parsamyan and S. P aul and H. Pekeler and J. -C. Peng and M. Pešek and D. V. Peshekhonov and M. Pešková and S. Platchkov and J. Pochodzalla and V. A. Polyakov and P. Pucci 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. S andacz and S. Sarkar and I. A. Savin and G. Sbrizzai and H. Schmieden and A. Selyunin and S. Seriubin and L. Sinha and D. Spülbeck 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 V. Tskhay and B. Valino ti and B. M. Veit and J. F. C. A. Veloso 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:2512.22311},
year = {2025}
}
Comments
6 pages, 3 figures