Transversity Signal in two Hadron Pair Production in COMPASS

Measuring single spin asymmetries in semi-inclusive deep-inelastic scattering (SIDIS) on a transversely polarized target gives a handle to investigate the transversity distribution and transverse momentum dependent distribution functions. In the years 2002, 2003 and 2004 COMPASS took data with a transversely polarized deuteron target and in the year 2007 with a proton target. Three channels for accessing transversity have been analysed. Azimuthal asymmetries in the production of hadron pairs, involving the polarized two hadron interference fragmentation function [1], azimuthal asymmetries in the production of single hadrons, involving the Collins fragmentation function and polarization measurements of spin- 1 2 ~ particles like -Hyperons via their self analyzing weak decay [2]. In the following we will focus on new preliminary results from the analysis of two hadron pair asymmetries measured with the proton target.