Effect of dephasing on mesoscopic conductance fluctuations in quantum dots with single-channel leads

We consider the distribution of conductance fluctuations in disordered quantum dots with single-channel leads. Using a perturbative diagrammatic approach, valid for continuous level spectra, we describe dephasing due to processes within the dot by considering two different contributions to the level broadening, thus satisfying particle number conservation. Instead of a completely non-Gaussian distribution, which occurs for zero dephasing, we find for strong dephasing that the distribution is mainly Gaussian with nonuniversal variance and non-Gaussian tails.