Transversity signals in two hadron correlation at COMPASS

Measurement of two hadron production introducing the chiral odd interference fragmentation function $H^{\sphericalangle}_{1}$ is considered a new probe of the transverse spin distribution $\Delta_{T}q(x)$. COMPASS is a fixed target experiment on the SPS M2 beamline at CERN. Its target can be polarised both longitudinally and transversally with respect to the polarised 160 GeV/c $\mu^{+}$ beam. In 2002, 2003, and 2004, 20% of the beam-time was spent in the transverse configuration on a $^{6}$LiD target, allowing the measurement of transversity effects. First results of the analysis of two hadron production will be reported.