Speaker
Description
Studying the partonic and spin structure of the nucleon via Semi-Inclusive measurements of DIS (SIDIS) is one of the most important objectives of the COMPASS experiment (CERN, SPS). Nucleon spin (in)dependent azimuthal asymmetries accessible in single-hadron and hadron-pair production in SIDIS encode information on both the partonic structure of the nucleon and the fragmentation process. Production of vector mesons in SIDIS is a particularly interesting channel to study the polarized fragmentation and related phenomena. In this talk preliminary COMPASS results for the first ever measurement of inclusive $\rho^0$ transverse-spin asymmetries will be shown for the first time.
The analysis is based on the data-set collected by COMPASS in 2010 using a 160 GeV/c $\mu^+$ beam and a transversely polarized $NH_3$ target.
The asymmetries are extracted as function of Bjorken-x, total transverse momentum of the hadron pair and the energy fraction carried by the pair.
