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  • Letter
  • Open Access

New method to clarify the contribution of the chiral magnetic effect in small collision systems p↑+A involving a transversely polarized proton

Gui-Zhen Wu (吴桂珍)1,*, Zong-Wei Zhang (张宗炜)2,1,*, Chen Gao (高晨)1, Yi Xu (许易)1, and Wei-Tian Deng (邓维天)1,†

  • *These authors contributed equally to this work.
  • †Contact author: dengwt@hust.edu.cn
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Phys. Rev. C 110, L061901 – Published 2 December, 2024

DOI: https://doi.org/10.1103/PhysRevC.110.L061901

Abstract

In this Letter, we propose a new experimental method to check the contribution of the chiral magnetic effect (CME). With experimental data of deep inelastic scattering (DIS) involving transversely polarized proton, we have calculated the three-dimensional charge density inside the polarized proton, which is found to have a significant violation to spherical symmetry. Then we have calculated the property of electromagnetic field (EM field) generated by a single transversely polarized proton (p↑). Based on them, the EM fields generated in small collision system p↑+A are studied. We find that the orientation of this EM field has a significant dependence on the polarization direction of the proton, and the correlator (Δγ) has also significant dependence on the angle between the reaction plane and polarization direction. As background contributions are canceled comparing two collision geometry schemes, only the contribution of CME remains.

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Phys. Rev. C 110, L061901– Published 2 December, 2024
  • Received 6 August 2024
  • Accepted 24 October 2024
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.

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