Anisotropic flow of identified particles in Au+Au collisions at AGS energy

The E877 experimental setup is discussed in detail elsewhere [1–4]. In the current analysis, for the reaction plane determination and the evaluation of the reaction plane resolution, we exploit the almost 4π calorimeter coverage of the apparatus (the Target Calorimeter (TCal) covers the pseudorapidity range −0.5 < η < 0.8, the Participant Calorimeter (PCal) 0.8 < η < 4.2). Charged particles, emitted in the forward direction (−134 < θhorizontal < 16 mrad, −11 < θvertical < 11 mrad), are analyzed by a high resolution magnetic spectrometer. The average momentum resolution is ∆p/p ≈3% limited by multiple scattering. A time-of-flight hodoscope located behind the tracking chambers (10 m from the target) provides time-of-flight information with a typical resolution of 85 ps. For the identification of charge=2 particles we also use the Forward Scintillator array located approximately 33 m downstream of the target. The centrality of the collisions is determined by the transverse energy deposited in the PCal (see Table 1).