Azimuthal single- and double-spin asymmetries in semi-inclusive deep-inelastic lepton scattering by transversely polarized protons
Abstract
A comprehensive set of azimuthal single-spin and double-spin asymmetries in semi-inclusive leptoproduction of pions, charged kaons, protons, and antiprotons from transversely polarized protons is presented. These asymmetries include the previously published HERMES results on Collins and Sivers asymmetries, the analysis of which has been extended to include protons and antiprotons and also to an extraction in a three-dimensional kinematic binning and enlarged phase space. They are complemented by corresponding results for the remaining four single-spin and four double-spin asymmetries allowed in the one-photon-exchange approximation of the semi-inclusive deep-inelastic scattering process for target-polarization orientation perpendicular to the direction of the incoming lepton beam. Among those results, significant non-vanishing modulations provide evidence for a sizable worm-gear (II) distribution, . Most of the other modulations are found to be consistent with zero with the notable exception of large modulations for charged pions and positive kaons.
Keywords
Cite
@article{arxiv.2007.07755,
title = {Azimuthal single- and double-spin asymmetries in semi-inclusive deep-inelastic lepton scattering by transversely polarized protons},
author = {HERMES Collaboration and A. Airapetian and N. Akopov and Z. Akopov and E. C. Aschenauer and W. Augustyniak and R. Avakian and A. Bacchetta and S. Belostotski and V. Bryzgalov and G. P. Capitani and E. Cisbani and G. Ciullo and M. Contalbrigo and W. Deconinck and R. De Leo and E. De Sanctis and M. Diefenthaler and P. Di Nezza and M. Düren and G. Elbakian and F. Ellinghaus and A. Fantoni and L. Felawka and G. Gavrilov and V. Gharibyan and Y. Holler and A. Ivanilov and H. E. Jackson and S. Joosten and R. Kaiser and G. Karyan and E. Kinney and A. Kisselev and V. Kozlov and P. Kravchenko and L. Lagamba and L. Lapikás and P. Lenisa and W. Lorenzon and S. I. Manaenkov and B. Marianski and H. Marukyan and Y. Miyachi and A. Movsisyan and V. Muccifora and Y. Naryshkin and A. Nass and G. Nazaryan and W. -D. Nowak and L. L. Pappalardo and P. E. Reimer and A. R. Reolon and C. Riedl and K. Rith and G. Rosner and A. Rostomyan and J. Rubin and D. Ryckbosch and A. Schäfer and G. Schnell and B. Seitz and T. -A. Shibata and V. Shutov and M. Statera and A. Terkulov and M. Tytgat and Y. Van Haarlem and C. Van Hulse and D. Veretennikov and I. Vilardi and S. Yaschenko and D. Zeiler and B. Zihlmann and P. Zupranski},
journal= {arXiv preprint arXiv:2007.07755},
year = {2020}
}