Measurement of reaction plane correlations in Pb-Pb collisions at sqrt(sNN)=2.76 TeV with the ATLAS detector

The flow harmonics v_n have been studied in detail at RHIC and the LHC. However not much emphasis has been put on measuring the correlations between the harmonic planes Phi_n themselves. These correlations are complementary observables to the v_n and carry information about the collision geometry as well as the dynamical evolution of the medium. We present the first measurements of such correlations between the harmonic planes Phi_2 to Phi_6 using the ATLAS detector at LHC. The ATLAS detector has full azimuthal acceptance, its calorimeters extend out to +/-4.9 units of pseudo-rapidity and the tracking system measures charged particle tracks within +/-2.5 units of pseudo-rapidity. ATLAS recorded, 8ub-1 Pb+Pb data in the 2010 heavy ion run. This dataset combined with the large acceptance allows for a precise measurement of the harmonic plane correlations. The procedure for obtaining the correlations, correcting for detector effects and a detailed estimation of the systematic errors will be presented.