Speaker
Christopher Braun
(Friedrich-Alexander-Univ. Erlangen (DE))
Description
The parton distribution function $h_{1}^{q}(x)$ of a transversely polarized
quark $q$ inside a transversely polarized nucleon, is chiral-odd and therefore
not accessible in inclusive deep-inelastic scattering. It can however be observed in
semi-inclusive deep-inelastic scattering (SIDIS) in combination with another
chiral-odd function, for instance the dihadron interference fragmentation function (DiFF)
$H_{1}^{\triangleleft q}$. The $160\,\mbox{GeV}/c$ polarized muon beam of CERN's
M2 beamline allows COMPASS to investigate transverse spin effects
using polarized solid-state targets. In this contribution an overview of COMPASS results for the azimuthal asymmetry
in identified dihadron production is given. Pions and kaons were identified by a RICH detector.
Recently, the full set of this asymmetry from the COMPASS data
on the deuteron and the proton target became available. All data, including early data sets, were
analyzed using the same methods and requirements. The results are compared to
model predictions and HERMES data. Furthermore an extraction of the transversity
distribution function $h_{1}(x)$ for $u$ and $d$ quarks was carried out with this full data set.
Primary author
Christopher Braun
(Friedrich-Alexander-Univ. Erlangen (DE))
