DIS 2008

Measurements of ΔG/G from high transverse momentum hadrons pairs in COMPASS

8 Apr 2008, 09:40

20m

Room (University College London)

Spin Physics Spin Physics Working Group

Speaker

Marcin Stolarski (Faculty of Physics - Warsaw University of Technology)

Description

A new COMPASS value of $\mathrm{\Delta }G/G$, obtained from high transverse momentum hadrons pairs in the $Q^2>1$ (GeV/$c$)${}^2$ region is presented. The statistical error of $\mathrm{\Delta }G/G$ ($\approx 0.094$) is reduced by a factor 3 in comparison to the previous analysis in the same kinematic region. The new measurement is based on a neural network approach using weighted events. In addition the formula used for the extraction of $\mathrm{\Delta }G/G$ has been updated and the contributions coming from the leading order or the QCD Compton processes are no longer neglected. Finally the results obtained for the $Q^2<1$ (GeV/$c$)${}^2$ region are also presented.

Presentation materials

Slides

stolarski_dis08_spin.pdf