Spin-Dependent-5th-Force-Limits
This dataset compiles results from existing exotic boson searches, with a specific focus on the fifth force—particularly the spin-dependent fifth force (SDFF). It is intended as a live platform to provide researchers in the field with convenient access to relevant data.
View the Project on GitHub Lei-Cong/Spin-Dependent-5th-Force-Limits
Dataset Instruction
Overview
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. An SDFF is a force that depends on the spins of the involved fermions, similar to the magnetic force.
We categorize interactions into the following types:
- Axial-vector/vector, axial-vector/axial-vector, vector/vector.
- Pseudoscalar/scalar, pseudoscalar/pseudoscalar, scalar/scalar.
- Tensor/tensor, pseudotensor/tensor, and pseudotensor/pseudotensor.
For notation and operator definitions, see 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).
Citation
Please cite this repository as follows: 
. One can copy the BibTeX file from here: BibTeX Format.
Datasets
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Download the complete normalized dataset and example plotting code:
📦 Download SDFF normalized dataset -
🌐 Interactive Plot Viewer (Test Version) 👉 Spin-Dependent Fifth-Force Interactive Viewer (Test)
⚠️ Note: The webpage may take up to 10 seconds to load all datasets. If no figure appear after that, please try refreshing the page.
The viewer allows users to:
- Select and overlay different coupling types (e.g., gAgA, gpgp, etc.)
- Display or hide datasets
- Upload your own data files (λ [m], gg) for direct comparison
1. gAgA
- 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.
2. gAgV
- Description: Constraints for vector/vector couplings ($g_Ag_V$).
- Data: The data are available in the folder gAgV.
3. gVgV
- Description: Constraints for vector/vector couplings ($g_Vg_V$).
- Data: The data are available in the folder gVgV.
4. gpgs
- Description: Constraints for pseudoscalar/scalar couplings ($g_pg_s$).
-
Data: The data are available in the folder gpgs.
- Ciaran O’Hare’s page: The similar dataset for $g_pg_s$ can be found here.
5. gpgp
- Description: Constraints for pseudoscalar/pseudoscalar couplings ($g_pg_p$).
- Data: The data are available in the folder gpgp.
6. gsgs
- Description: Constraints for scalar/scalar couplings ($g_sg_s$).
- Data: The data are available in the folder gsgs.
7. Tensor and Pseudotensor Interactions
- Description: Constraints for tensor and pseudotensor Interactions couplings.
- Data: Please find the data in Tab. IV and V of our review
8. V1 Results
- Data: The data are available in the folder V1.
Course
- 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
Conference Information
- 2020 Seminar on Precision Physics and Fundamental Symmetries
- 17.01 to 20.01, 2025, International Symposium on New Physics Beyond the Standard Model, Sanya, China
- 17.02 to 21.02, 2025 CAU BSM Workshop, Seoul, Korea
- 24.03 to 27.03, 2025Criticality and Continuous Measurements in Quantum Sensing: From Theory to Experiments
- 04.05 to 14.05, 2025 LULBI - Light \& ultralight BSM interactions
- 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), Warsaw, Poland
- 23.06 to 11.07, 2025 Axions in Stockholm
- 04.08 to 15.08, 2025 New ways to discover light new physics, Mainz, Germany
- 22.09 to 26.09, 2025 20th Patras Workshop on Axions, WIMPs and WISPs, Tenerife, Spain
- 29.09 to 03.10, 2025 Ultralight Dark Matter and observable phenomena, Trieste, Italy
- 29.03 to 01.04, 2026 Parity Violation in Molecules, Bad Honnef, Germany
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18.05 to 22.05, 2026 International Conference on Precision Physics of Simple Atomic Systems (PSAS 2026)
Job Information
- Humboldt Research Fellowship
- Marie Skłodowska-Curie Actions - Postdoctoral Fellowships; More Information
- Helmholtz-OCPC Postdoctoral Program; OCPC Announcement
- CSC-DAAD
- Fondazione Antonio Madonna ETS
-
Enrico Fermi Fellowships
Subscription
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Acknowledgement
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 Peng-Shun Luo, and [You], who provided data for this repository, enabling its comprehensive and collaborative nature.