Studying high pT momentum azimuthal anisotropies in unpolarized proton-proton collisions using transverse momentum dependent (TMD) parton distribution and fragmentation functions
Soudi, I., & Majumder, A. (2024). Studying high pT momentum azimuthal anisotropies in unpolarized proton-proton collisions using transverse momentum dependent (TMD) parton distribution and fragmentation functions. In A. Vossen, T. Mehen, M. Copeland, R. Hodges, G. Matousek, M. McEneaney, K. Parham, C. Pecar, & S. Schneider (Eds.), SPIN2023 : 25th International Symposium on Spin Physics (Article 164). Sissa. POS Proceedings of Science, 456. https://doi.org/10.22323/1.456.0164
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POS Proceedings of ScienceEditors
Date
2024Copyright
© 2024 the Authors
Recent experimental results have shown that small systems such as p-p and p-A collisions exhibit a non-zero azimuthal anisotropy even at large pT.However, no evidence of jet quenching has been observed in these collisions.
We investigate the possibility that the azimuthal anisotropy of high-pT hadrons can be generated by the intrinsic transverse momentum of the partons in the proton. After introducing transverse momentum dependent (TMD) parton distribution and fragmentation functions, additional polarization effects are allowed. Unpolarized protons can generate transversely polarized quarks or linearly polarized gluons through a distribution known as the Boer-Mulders' function.
The fragmentation of similarly polarized partons to unpolarized hadrons is called the Collins' function. We find that the high-pT azimuthal anisotropies can be obtained using these TMD distributions without modification to the angle integrated spectra.
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SissaConference
International Symposium on Spin PhysicsIs part of publication
SPIN2023 : 25th International Symposium on Spin PhysicsISSN Search the Publication Forum
1824-8039Publication in research information system
https://converis.jyu.fi/converis/portal/detail/Publication/233386737
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Related funder(s)
European Commission; Research Council of FinlandFunding program(s)
ERC Advanced Grant; Centre of Excellence, AoF
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about funding
This work is supported by the US D.O.E. under grant number DE-SC0013460. IS is currently funded as a part of the European Research Council project ERC-2018-ADG-835105 YoctoLHC, and as a part of the Center of Excellence in Quark Matter of the Academy of Finland (project 346325).License
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