Abstract
The complex scaling method combined with the stochastic variational approach has been used to calculate the energy and widths of a number of $L=0$ resonant states of the positron-hydrogen system. The interparticle correlation functions reveal evidence of cluster formation in the resonance state. The lowest $L=0$ resonance associated with the $\text{H}(n=2)$ threshold shows a bulge in the ${e}^{\ensuremath{-}}\text{\ensuremath{-}}{e}^{+}$ correlation function located at the same distance as the probability maximum of the $\text{Ps}(1s)$ state.
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