Aug 12 – 18, 2012
US/Eastern timezone

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Detailed HBT measurement with respect to event plane and collision energy in Au+Au collisions at PHENIX

Aug 14, 2012, 2:15 PM



Takafumi for the PHENIX Collaboration Niida (University of Tsukuba)


The HBT measurement provides the information on the space-time evolution of particle emitting source in relativistic heavy ion collisions. Azimuthal component of 3D HBT radii relative to event plane gives us the information of the source shape at freeze-out. It also provides the information of the system evolution by comparing with the initial source shape. The recent measurement of higher harmonic flow ($v_{3}$, $v_{4}$, etc) are measured at RHIC and LHC, which are primarily coming from the spatial fluctuation of the initial density on the collision area. Hydrodynamic model calculation reports that the shape by the initial fluctuation resulting in triangular component may be preserved until freeze-out. The HBT measurement relative to higher order event plane may show the feature if this is the case. We will present the recent results of azimuthal HBT measurement relative to 2^{nd} and 3^{rd} order event plane in Au+Au 200 GeV collisions at PHENIX. Eccentricity at freeze-out for charged pions and kaons will be compared and discussed. Also, triangularity at freeze-out for charged pions will be reported. The recent HBT measurement at lower energies will also be shown, and compared with 200GeV results.

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