Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 8: Elektromagnetische und Hadronische Proben

HK 8.3: Vortrag

Freitag, 4. März 2005, 17:00–17:15, TU MA001

Measurement of the double helicity asymmetry in π⁰ production in polarized p + p collisions at √s = 200 GeV. — •Oliver Zaudtke — Institut für Kernphysik, Münster, Germany

Polarized deep-inelastic lepton scattering experiments have indicated that only 20-30% of the nucleon spin is carried by quarks and antiquarks in the nucleon. Gluons may contribute a significant part to the nucleon spin. Gluon polarization can not be directly measured in low energy polarized deep inelastic scattering fixed target experiments, since virtual photons do not couple to gluons directly. However, in polarized p + p collisions at high energies the gluons participate directly and hence the gluon polarization can be probed. One promising method is the measurement of the double helicity asymmetry (A_LL) in high p_T π⁰ production.

The Relativistic Heavy Ion Collider (RHIC) is the first accelerator to collide polarized protons at high energies. We will present first measurements of π⁰ A_LL with the PHENIX detector at √s = 200 GeV.