The mean and variance of the number of segregating sites since the last hitchhiking event.

Abstract excerpt

Tight linkage may cause a reduction of nucleotide diversity in a chromosomal region if an advantageous mutation appears in that region which is driven to fixation by directional selection. This process is usually called genetic hitchhiking. If selection is strong, the entire process takes place during a time period of length s/2 1n (2N) that is very short relative to 2N generations [s is the selection coefficient...

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