Recently, some experiments show that the supersymmetry is not realised by Nature according to the simple models that we currently have. Nevertheless, it is far from saying that the "game is over" as SUSY might be realised at an unknown energy. I would like to ask what are the experiments that could give us a clue whether SUSY assumption is wrong. Will the LHC / VLHC be able to rule it out in the future?
Answer
One recent result which provided certain definite constraints came not from particle physics but from molecular physics. Using cold molecules, it is possible to achieve very high precision measurements on properties like the electric dipole moment of the electron, which are on a par or better than the constraints provided by particle physics experiments, and beginning to bite into the territory of certain supersymmetric theories.
This is nicely explained in this Physics World article about the latest result, an experiment on thorium monoxide molecules performed by the ACME collaboration and reported in
Order of Magnitude Smaller Limit on the Electric Dipole Moment of the Electron. The ACME Collaboration. Science 1248213, 2013-12-19. arXiv:1310.7534.
To borrow an image from Physics World, different supersymmetric theories predict different ranges of values for $d_e$:
The ACME result constrains it to $|d_e|<8.7\times 10^{−29}\ e\ \text{cm}$. It is therefore my impression that it does rule out, or heavily constrain, several SUSY candidates.
No comments:
Post a Comment