Link between CP violation and supersymmetry?

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SUMMARY

The discussion centers on the relationship between CP violation in B mesons and supersymmetry (SUSY). It highlights that the decay of Bs mesons into two muons is a critical factor that raises concerns regarding SUSY models. The standard model predicts a very low branching fraction for this decay, approximately 3 out of a billion for Bs mesons and even lower for Bd mesons. If experimental results show a branching fraction that exceeds the standard model predictions, it would disfavor SUSY models due to the introduction of additional decay channels.

PREREQUISITES
  • Understanding of CP violation in particle physics
  • Knowledge of B meson decay processes
  • Familiarity with branching fractions and their significance
  • Basic concepts of supersymmetry (SUSY) in theoretical physics
NEXT STEPS
  • Research the implications of CP violation in B meson decays
  • Study the standard model predictions for B meson branching fractions
  • Explore the role of additional decay channels in SUSY models
  • Investigate experimental results related to B meson decays and SUSY
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Particle physicists, theoretical physicists, and researchers interested in the implications of CP violation and supersymmetry in high-energy physics.

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I have been looking in SUSY and have seen that the CP violation of B mesons into two muons is one of the key facts that has cast further doubt over SUSY. I don t really understand how the CP violation of B mesons is a sign of SUSY issues, so if you are able to clear this up for me that would be much appreciated.
 
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I think you mean the decay of Bs mesons to two muons. This has nothing to do with CP violation. The standard model prediction for the branching fraction is tiny, but new fields/particles could have enhanced that significantly as they could add new decay mechanisms.
 
Yes that's what I mean, forgot to include the subscript. Could you explain what you mean by the branching fraction?
 
The probability that the particle decays to two muons. On average, about 3 out of a billion Bs decay to two muons.

For Bd, the probability is even lower with 1 out of 10 billions.
 
As for susy issues, I'd say that the main concern about the branching ratios come from the fact that SuSy will allow additional channels for a process...
So let's say that for the SM you have X% predicted events...
and for SM+SUSY you have X+Y % predicted events...
If experiment allows for X% but not for X+Y% then SUSY [models] gets disfavored. Of course you have a lot of parameters to play with in such scenarios, like playing with the masses of the spartners and so on... But the more you play with it, SuSy can change a lot..
 
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