We show how the semiclassical Langevin method can be extended to calculationsof higher-than-second cumulants of noise. These cumulants are affected byindirect correlations between the fluctuations, which may be considered as"noise of noise." We formulate simple diagrammatic rules for calculating thehigher cumulants and apply them to mesoscopic diffusive contacts and chaoticcavities. As one of the application of the method, we analyze the frequencydependence of the third cumulant of current in these systems and show that itcontains additional peculiarities as compared to the second cumulant. Theeffects of environmental feedback in measurements of the third cumulant arealso discussed in terms of this method.
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