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FLOW measurement with V0 Detector

FLOW measurement with V0 Detector. Flow in Heavy ion collision. A geometry shape of overlap region may generate collective motion in particle production Particle distribution in transvers direction with Fourier transformation called FLOW. Event plane Method.

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FLOW measurement with V0 Detector

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  1. FLOW measurement with V0 Detector

  2. Flow in Heavy ion collision • A geometry shape of overlap region may generate collective motion in particle production • Particle distribution in transvers direction with Fourier transformation called FLOW

  3. Event plane Method • One way to measure this FLOW value is Event plane method. • In EP method, measure event plane with Flow Q-Vector and calculate observed FLOW value(Vn^obs) and corrected by Resolution

  4. EP Method in ALICE • And past HIM meeting 2012 @ Pyungchang, Myunggeun Song shows, Event Plane measurement with V0 detector which place in forward direction can remove non-flow effect from jet • But measure event plane with V0 detector can cause another problem related to resolution. Because V0 detector has only 8 sector in azimuthal direction. • And, in EP method, if resolution is not perfect, Flow value is not <Vn>. It is somewhat between <Vn> and rms of Vn

  5. SP Mehtod • To solve this problem, we introduce Scalar Product Method which is advanced method of EP method • In this method, we use magnitude of flow vector when calculated FLOW

  6. AMPT Simulation result • Before detector smearing (High resolution) • Error is not calculated • Use 2sub event method to calculate resolution • Result with SP Method and EP Method are almost same

  7. AMPT simulation result • After detector smearing (low resolution) • Error is not calculated • Use 2sub event method to calculate resolution • Result with SP method is about 10% lower then result of EP method

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