  We investigate the current noise correlations at a quantum point contact in a
quantum spin Hall structure, focusing on the effect of a weak magnetic field in
the presence of disorder. For the case of two equally biased terminals we
discover a robust peak: the noise correlations vanish at $B = 0 $ and are
negative for $B\not = 0 $. We find that the character of this peak is
intimately related to the interplay between time reversal symmetry and the
helical nature of the edge states and call it the Z2 peak.
