Abstract
The transversity distribution, which describes transversely polarized quarks in transversely polarized nucleons, is a fundamental component of the spin structure of the nucleon, and is only loosely constrained by global fits to existing semi-inclusive deep inelastic scattering (SIDIS) data. In transversely polarized p↑ + p collisions it can be accessed using transverse polarization dependent fragmentation functions which give rise to azimuthal correlations between the polarization of the struck parton and the final state scalar mesons.
This letter reports on spin dependent di-hadron correlations measured by the STAR experiment. The new dataset corresponds to 25 pb−1 integrated luminosity of p↑ + p collisions at √s = 500 GeV, an increase of more than a factor of ten compared to our previous measurement at √s = 200 GeV. Non-zero asymmetries sensitive to transversity are observed at a Q2 of several hundred GeV and are found to be consistent with the former measurement and a model calculation. We expect that these data will enable an extraction of transversity with comparable precision to current SIDIS datasets but at much higher momentum transfers where subleading effects are suppressed.
Document Type
Article
Publication Date
5-10-2018
Digital Object Identifier (DOI)
https://doi.org/10.1016/j.physletb.2018.02.069
Funding Information
Funded by SCOAP3.
Related Content
Supplementary material related to this article can be found online at https://doi.org/10.1016/j.physletb.2018.02.069.
Repository Citation
Adamczyk, L.; Adams, J. R.; Adkins, James K.; Agakishiev, G.; Aggarwal, M. M.; Ahammed, Z.; Ajitanand, N. N.; Alekseev, I.; Anderson, D. M.; Aoyama, R.; Aparin, A.; Arkhipkin, D.; Aschenauer, E. C.; Ashraf, M. U.; Attri, A.; Averichev, G. S.; Bairathi, V.; Barish, K.; Behera, A.; Bellwied, R.; Bhasin, A.; Bhati, A. K.; Bhattarai, P.; Bielcik, J.; Bielcikova, J.; Bland, L. C.; Bordyuzhin, I. G.; Bouchet, J.; Brandenburg, J. D.; Brandin, A. V.; Fatemi, Renee H.; and Ramachandran, Suvarna, "Transverse Spin-Dependent Azimuthal Correlations of Charged Pion Pairs Measured in p↑ + p Collisions at √s = 500 GeV" (2018). Physics and Astronomy Faculty Publications. 595.
https://uknowledge.uky.edu/physastron_facpub/595
Appendix A. Supplementary material
Notes/Citation Information
Published in Physics Letters B, v. 780, p. 332-339.
© 2018 The Author(s). Published by Elsevier B.V.
This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Due to the large number of authors, only the first 30 and the authors affiliated with the University of Kentucky are listed in the author section above. For the complete list of authors, please download this article or visit: https://doi.org/10.1016/j.physletb.2018.02.069