If the PETRA accelerator only goes up to 45GeV, how can we know that Lambda of quark/lepton constituents would be greater than 750GeV, according to the 1983 article New Tests for Quark and Lepton Substructure
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asked Sep 17, 2018 at 19:28
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Looking for compositeness functions are fitted to data according to predictions of specific models.
The function has a Λ giving the scale in energy where the composite particles will have to appear in experiments.
This can be left variable in a fit of the data to the model predictions. Thus even for much lower energies , if the data are very accurate, a limit can be given for the Λ fitted in the formula dependent on the errors of the measurements.
