This repository contains datasets of constraints on spin-dependent exotic interactions, also referred to as the spin-dependent fifth force (SDFF), mediated by the exchange of a single boson of mass M between fermions X and Y. The fifth force refers to a new force beyond the existing four fundamental forces of nature. A SDFF is a force that depends on the spins of the involved fermions, similar to the magnetic force.

The interactions are categorized into the following types:

1. Axial-vector/vector, axial-vector/axial-vector, vector/vector.
2. Pseudoscalar/scalar, pseudoscalar/pseudoscalar, scalar/scalar.
3. Tensor/tensor, pseudotensor/tensor, and pseudotensor/pseudotensor.

As a reference, one may consult the format of the exotic potentials presented in the RMP review: Spin-Dependent Exotic Interactions.

The repository serves as a live webpage designed to present the latest experimental results. For contributions or to include your new results, please feel free to contact Dr. Lei Cong (congllzu@gmail.com), Dr. Wei Ji (weiji001@uni-mainz.de), or Prof. Dmitry Budker (budker@uni-mainz.de).

Please cite this repository as follows: . One can copy the BibTeX file from here: BibTeX Format.

• Description: Constraints for axial-vector/axial-vector couplings ($g_Ag_A$) are presented across different interaction categories, including lepton-lepton, lepton-nucleon, and nucleon-nucleon interactions.

• Data: The data are available in the folder gAgA.

• Interactive Plots: Explore the constraints through interactive plots:

  • Lepton-lepton Interactions: View Plot via Binder
  • Lepton-nucleon Interactions: View Plot
  • Nucleon-nucleon Interactions: View Plot

• Description: (Provide a brief description of the $g_Ag_V$ coupling constraints and their significance.)
• Data: (Specify the folder or file where the data is located.)
• Interactive Plot: (Provide a link to the interactive plot if available.)

• Description: (Provide a brief description of the $g_Vg_V$ coupling constraints and their significance.)
• Data: (Specify the folder or file where the data is located.)
• Interactive Plot: (Provide a link to the interactive plot if available.)

• Description: (Provide a brief description of the $g_pg_s$ coupling constraints and their significance.)
• Data: (Specify the folder or file where the data is located.)
• Interactive Plot: (Provide a link to the interactive plot if available.)
• The similar dataset for $g_pg_s$ can be found in Ciaran O'Hare's github

• Description: (Provide a brief description of the $g_pg_p$ coupling constraints and their significance.)
• Data: (Specify the folder or file where the data is located.)
• Interactive Plot: (Provide a link to the interactive plot if available.)

• Description: Constraints for scalar/scalar couplings ($g_sg_s$).
• Data: The data are presented in the folder gsgs.
• Interactive Plot: You can view the interactive plot for scalar/scalar constraints here:
  gsgs Plot.

• Description: (Provide a brief description of tensor and pseudotensor coupling constraints.)
• Data: (Specify the folder or file where the data is located.)
• Interactive Plot: (Provide a link to the interactive plot if available.)

• See the file named V1_data.md for organized details.
  The data are presented in the folder V1alphadataLei.
• See the file named $g_g_s$.md for organized details.
  The data are presented in the folder g_g_sdata.

• TASI Lectures
• ETH, Quantum Technologies for Searches of New Physics
• University of Bologna
• Why Do We Think There's Physics Beyond the Standard Model? by Bryan Webber
• Probing New Physics at Precision Frontier - by Prof. Yotam Soreq

• 17.01 to 20.01, 2025, International Symposium on New Physics Beyond the Standard Model, Sanya, China
• 17.02to 21.02, 2025 CAU BSM Workshop, Seoul, Korea
• 24.03 to 27.03, 2025Criticality and Continuous Measurements in Quantum Sensing: From Theory to Experiments
• 11.05 to 16.05, 2025, Frontiers of Quantum Metrology for New Physics Searches, Bad Honnef, Germany
• 26.05 to 30.05, 2025 10th International Conference on Precision Physics and Fundamental Physical Constants (FFK2025)
• 23.06 to 11.07, 2025 Axions in Stockholm
• 04.08 to 15.08, 2025 New ways to discover light new physics, Mainz, Germany

• Humboldt Research Fellowship
• Marie Skłodowska-Curie Actions - Postdoctoral Fellowships; More Information
• Helmholtz-OCPC Postdoctoral Program; OCPC Announcement
• CSC-DAAD

Soon...

We would like to express our gratitude to Fadeev Pavel, Wei Ji for initiating the idea of this webpage. We sincerely acknowledge Haosen Guan for collecting most of the data. We deeply appreciate Yevgeny Stadnik for supervising the work on astrophysical limits and combined limits. We also extend our heartfelt thanks to Prof. Dmitry Budker for his invaluable support and guidance.

Additionally, we would like to thank all contributors, including [Name 1], [Name 2], and [Name 3], who provided data for this repository, enabling its comprehensive and collaborative nature.