- Physical Review Journals
All JournalsPhysics Magazine

Physical Review Letters

Reuse & Permissions

It is not necessary to obtain permission to reuse this article or its components as it is available under the terms of the Creative Commons Attribution 4.0 International license. This license permits unrestricted use, distribution, and reproduction in any medium, provided attribution to the author(s) and the published article's title, journal citation, and DOI are maintained. Please note that some figures may have been included with permission from other third parties. It is your responsibility to obtain the proper permission from the rights holder directly for these figures.

Export citation

Export citation

Choose format for download:

Download Citation
  • Open Access

Perturbative QCD Prediction of the Hyperon Electric Dipole Moment from CP-Violating Dipole Interactions

Kai-Bao Chen1, Xiao-Gang He2,3, Jian-Ping Ma4,5, and Xuan-Bo Tong6,7

PDF

Phys. Rev. Lett. 136, 051902 – Published 4 February, 2026

DOI: https://doi.org/10.1103/1x3y-qbcx

Abstract

The electric dipole moment (EDM) of baryons provides a sensitive probe of CP-violating interactions beyond the standard model. Motivated by the recent BESIII measurement on the Λ hyperon EDM [Ablikim et al., arXiv:2506.19180.], we present the first perturbative QCD analysis of the Λ EDM form factor to elucidate its origin in CP-violating quark dipole interactions. In particular, we derive a QCD factorization formula that relates the Λ EDM form factor to quark EDMs and chromoelectric dipole moments through convolutions with light-cone distribution amplitudes of Λ. These connections allow us to extract constraints on CP-violating dipole couplings from current and future hyperon EDM measurements. Our numerical analysis demonstrates that the Λ EDM exhibits unique sensitivity to the strange-quark chromoelectric dipole moment, providing complementary information to that obtained from the neutron EDM.

View figure in article

Physics Subject Headings (PhySH)

Article Text

References (48)

  1. R. Alarcon, J. Alexander, V. Anastassopoulos, T. Aoki, R. Baartman, S. Baeßler, L. Bartoszek, D. H. Beck, F. Bedeschi, R. Berger et al., arXiv:2203.08103.
  2. T. Chupp, P. Fierlinger, M. Ramsey-Musolf, and J. Singh, Rev. Mod. Phys. 91, 015001 (2019).
  3. M. Ablikim et al. (BESIII Collaboration), arXiv:2506.19180.
  4. L. Pondrom, R. Handler, M. Sheaff, P. T. Cox, J. Dworkin, O. E. Overseth, T. Devlin, L. Schachinger, and Kenneth J. Heller, Phys. Rev. D 23, 814 (1981).
  5. X. G. He, J. P. Ma, and B. McKellar, Phys. Rev. D 47, R1744 (1993).
  6. X. G. He and J. P. Ma, Phys. Lett. B 839, 137834 (2023).
  7. M. Achasov, X. C. Ai, R. Aliberti, L. P. An, Q. An, X. Z. Bai, Y. Bai, O. Bakina, A. Barnyakov, V. Blinov et al., Front. Phys. 19, 14701 (2024).
  8. Y. Du, X. G. He, J. P. Ma, and X. Y. Du, Phys. Rev. D 110, 076019 (2024).
  9. V. A. Avdeenko, S. E. Korenblit, and V. L. Chernyak, Sov. J. Nucl. Phys. 33, 252 (1981).
  10. G. P. Lepage and S. J. Brodsky, Phys. Rev. Lett. 43, 545 (1979); 43, 1625(E) (1979).
  11. S. J. Brodsky and G. P. Lepage, Phys. Rev. D 24, 2848 (1981).
  12. A. V. Efremov and A. V. Radyushkin, Phys. Lett. 94B, 245 (1980).
  13. V. L. Chernyak and A. R. Zhitnitsky, JETP Lett. 25, 510 (1977).
  14. V. L. Chernyak and A. R. Zhitnitsky, Sov. J. Nucl. Phys. 31, 544 (1980).
  15. G. P. Lepage and S. J. Brodsky, Phys. Rev. D 22, 2157 (1980).
  16. V. L. Chernyak and A. R. Zhitnitsky, Phys. Rep. 112, 173 (1984).
  17. V. L. Chernyak and I. R. Zhitnitsky, Nucl. Phys. B246, 52 (1984).
  18. A. V. Belitsky, X. d. Ji, and F. Yuan, Phys. Rev. Lett. 91, 092003 (2003).
  19. X. B. Tong, J. P. Ma, and F. Yuan, Phys. Lett. B 823, 136751 (2021).
  20. X. B. Tong, J. P. Ma, and F. Yuan, J. High Energy Phys. 10 (2022) 046.
  21. P. Sun, X. B. Tong, and F. Yuan, Phys. Lett. B 822, 136655 (2021).
  22. P. Sun, X. B. Tong, and F. Yuan, Phys. Rev. D 105, 054032 (2022).
  23. L. B. Chen, W. Chen, F. Feng, S. Hu, and Y. Jia, Phys. Rev. Lett. 135, 131903 (2025).
  24. Y. K. Huang, B. X. Shi, Y. M. Wang, and X. C. Zhao, Phys. Rev. Lett. 135, 061901 (2025).
  25. L. B. Chen, W. Chen, F. Feng, and Y. Jia, Phys. Rev. Lett. 132, 201901 (2024); 134, 229901(E) (2025).
  26. Y. Ji, B. X. Shi, J. Wang, Y. F. Wang, Y. M. Wang, and H. X. Yu, Phys. Rev. Lett. 134, 221901 (2025).
  27. V. M. Braun, S. E. Derkachov, G. P. Korchemsky, and A. N. Manashov, Nucl. Phys. B553, 355 (1999).
  28. V. L. Chernyak, A. A. Olgloblin, and I. R. Zhitnitsky, Z. Phys. C 42, 569 (1989).
  29. S. J. Brodsky and G. R. Farrar, Phys. Rev. Lett. 31, 1153 (1973).
  30. X. d. Ji, J. P. Ma, and F. Yuan, Phys. Rev. Lett. 90, 241601 (2003).
  31. S. Weinberg, Phys. Rev. Lett. 63, 2333 (1989).
  32. V. L. Chernyak, A. A. Ogloblin, and I. R. Zhitnitsky, Yad. Fiz. 48, 1410 (1988).
  33. Y. L. Liu and M. Q. Huang, Nucl. Phys. A821, 80 (2009).
  34. Y. L. Liu, C. Y. Cui, and M. Q. Huang, Eur. Phys. J. C 74, 3041 (2014).
  35. G. S. Bali, V. M. Braun, M. Göckeler, M. Gruber, F. Hutzler, A. Schäfer, R. W. Schiel, J. Simeth, W. Söldner, A. Sternbeck et al., J. High Energy Phys. 02 (2016) 070.
  36. G. S. Bali, V. M. Braun, S. Bürger, M. Göckeler, M. Gruber, Fabian Hutzler, P. Korcyl, A. Schäfer, A. Sternbeck, and P. Wein (RQCD Collaboration), J. High Energy Phys. 08 (2019) 065.
  37. G. S. Bali et al. (RQCD Collaboration), Phys. Rev. D 111, 094517 (2025).
  38. M. H. Chu et al. (Lattice Parton Collaboration), Phys. Rev. D 111, 034510 (2025).
  39. H. Bai et al. (LPC Collaboration), Phys. Rev. D 112, 114515 (2025).
  40. V. M. Braun, A. N. Manashov, and J. Rohrwild, Nucl. Phys. B807, 89 (2009).
  41. X. Ji, Phys. Rev. Lett. 110, 262002 (2013).
  42. X. Ji, Sci. China Phys. Mech. Astron. 57, 1407 (2014).
  43. C. Abel, S. Afach, N. J. Ayres, C. A. Baker, G. Ban, G. Bison, K. Bodek, V. Bondar, M. Burghoff, E. Chanel et al., Phys. Rev. Lett. 124, 081803 (2020).
  44. R. Boughezal, D. de Florian, F. Petriello, and W. Vogelsang, Phys. Rev. D 107, 075028 (2023).
  45. X. K. Wen, B. Yan, Z. Yu, and C. P. Yuan, arXiv:2408.07255.
  46. Y. Huang, X. B. Tong, and H. L. Wang, arXiv:2508.08516.
  47. X. K. Wen, B. Yan, Z. Yu, and C. P. Yuan, Phys. Rev. D 112, 053004 (2025).
  48. Q. H. Cao, G. Li, X. K. Wen, and B. Yan, arXiv:2509.18276.

Outline

Information

Phys. Rev. Lett. 136, 051902– Published 4 February, 2026
  • Received 15 October 2025
  • Revised 4 January 2026
  • Accepted 12 January 2026
Crossmark - Check for updates button
Creative Commons Logo

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.

Published by the American Physical Society

Sign In to Your Journals Account

Filter

Filter

Article Lookup

Enter a citation