Experimental tests of a new Lorentz-invariant dynamics based solely on the first postulate of relativity .1.

We reanalyze some well-known experimental results within the framework of a new Lorentz-invariant dynamics (for particles and fields) based solely on the first postulate of special relativity. This theory differs from the conventional relativistic dynamics in a number of fundamental ways. However, new four-dimensional transformations still form the Lorentz group and the theory is consistent with all previously performed experiments.