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The multifireball event generator.

Interesting physics can be manifested in the ensemble probability density distributions as well as in the event-by-event (EbyE for short) observables. To illustrate the power of the EbyE observable we used, we should construct final states of charged particles indistinguishable from the point of view of ``traditional'', or ensemble-wise observables, such as

1. $\,dN/\,dy$ distribution
2. $\,dN/\,dp_T$, $1/mT \,dN/\,dm_T$ distribution etc.
3. multiplicity distribution

and compare the sensitivity of the above-mentioned observables with that of the EbyE one. In practice, we can accomplish the situation where the difference in texture, or EbyE features, is dominant and the difference in the ensemble-wise distributions shows up like a next order effect. This can be accomplished by tuning parameters of the model. In this situation, we test our experiment's (detector + software) sensitivity to the non-trivial features, using detector response simulation and the actual analysis software.

The sensitivity study was performed using a multifireball event generator created specially for this purpose. Writing a simple texture generator was undertaken to provide a model-independent calibration of the texture sensitivity of this analysis. The generator is used to produce textures of known magnitude; we do not suggest that the physics of $Pb+Pb$ collisions is properly described by a superposition of fireballs of a fixed size.