Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2010-12-13
Physics
High Energy Physics
High Energy Physics - Experiment
8 pages, 7 figures, Conference proceedings: SPIN2010 - 19th International Spin Physics Symposium September 27 - October 2, 201
Scientific paper
The Common Muon Proton Apparatus for Structure and Spectroscopy (COMPASS) at CERN with its use of beams of naturally polarized muons scattered of a polarized deuteron target, provides an environment of hard scattering between quasi-real photons and partons. Hard hadron quasi-real photo-production with polarized initial states is sensitive to the polarized gluon distribution $\Delta$G through $\gamma$-gluon($g$) direct channels as well as $q$-$g$ resolved processes. Comparisons of unpolarized differential cross section measurements to next-to-leading order (NLO) pQCD calculations are essential to develop our understanding of proton-proton and lepton-nucleon scattering at varying center of mass energies. These measurements are important to asses the applicability of NLO pQCD in interpreting polarized processes. In this talk we will discuss unidentified charged separated hadron production at low $Q^{2}$ (Q$^{2}<0.1 GeV^{2}/c^{2}$) and high transverse momenta (p$_{T}>1.0\,GeV/c$). $
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