Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 56: Hadron Structure and Spectroscopy I

HK 56.2: Talk

Wednesday, March 18, 2009, 17:00–17:15, H-ZO 20

Cross section asymmetries of D- and K- Mesons produced in deep-inelastic scattering of polarized muons from polarized nucleons — Alexander Zvyagin and •Martin Faessler — Fakultaet Physik, LMU, Am Coulombwall 1, D-85748 Garching

One of the main goals of the COMPASS experiment at CERN has been to measure the gluon polarization in a polarized nucleon. The production of open charm (D) mesons via the photon-gluon fusion in deep inelastic scattering of polarized muons on polarized nucleons is the ideal, direct probe for the gluon polarization. The D0 is detected via its decay to Kpi. The invariant K-pi mass spectrum shows other K-pi resonances in addition to the D0(1865), in particular 2 narrow peaks, which can be attributed to K2(1430) and K*(890). The measured cross section asymmetries for the 2 relative polarizations of muon and nucleon are shown for the D- and K-mesons and the background.