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Reaction Plane Detector at RHIC-PHENIX: Analysis of Au+Au Collisions

The Reaction Plane Detector (RXN) at RHIC-PHENIX analyzes 200GeV Au+Au collisions. Selections are based on BBC charged multiplicity and z-vertex criteria. The detector captures combined inner and outer segments to measure charge asymmetry and determine reaction centrality, with specific thresholds applied for event classification. The analysis considers parameters such as charge multiplicity, symmetry in south and north segments, and vertex positions to study collision dynamics. Various calculations and comparisons are conducted to assess event characteristics, demonstrating the capabilities of the RXN in experimental observations.

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Reaction Plane Detector at RHIC-PHENIX: Analysis of Au+Au Collisions

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  1. inner + outer combined inner segments outer segments < cos 2(FA+B - Ftrue ) > RXN BBC < cos 2(FA – FB ) > Reaction Plane Detector (RXN) at RHIC-PHENIX 200GeV Au+Au collisions RUN7 - 2007/Mar centrality selections are given by BBC charged multiplicity z-vertex selections by BBC [-40,40] cm [-30, -20] cm [-5,5] cm [20,30] cm total [~500] [500~1500] [1500~] RXN north charged mult. (a.u.) charged multiplicity in RXN (a.u.) RXN south charged mult. (a.u.) mid-central collisions < cos 2(Fsouth - Fnorth ) > BBC r.p. ~ 0.08 < sin 2(DF) > Fnorth (rad) Fsouth (rad) charged multiplicity in RXN (a.u.)

  2. centrality cut applied (rxnsum > 0.25rxnmax , 0~40%) Dt0 (ns) zdc rxn rxn zdc-bbc rxn-bbc rxn-zdc bbc bbc zdc Dzvtx (cm) zdc rxn rxn zdc-bbc rxn-bbc rxn-zdc bbc bbc zdc crxn-bbc crxn-zdc crxn-rxn Dzvtx (cm) crxn crxn crxn bbc zdc rxn crxn = f * (aS-aN) / (aS+aN)

  3. z_zdc (tdif) z_rxn (tdif) z_rxn (tdif) z_bbc (tdif) z_bbc (tdif) z_zdc (tdif) z_bbc (tdif) z_bbc (tdif) z_bbc (tdif) z_rxn charge asymmetry crxn = f *(aS-aN)/(aS+aN) z_rxn charge asymmetry c’rxn = func(crxn) z_rxn c’rxn + tdif func(x) = a [2/{1+exp(-bx)}-1.0]

  4. centrality cut applied (rxnsum > 0.25rxnmax , 0~40%) Dt0 (ns) zdc rxn rxn Dtzdc ~ 120ps Dtrxn ~ 230ps zdc-bbc rxn-bbc rxn-zdc bbc bbc zdc Dzvtx (cm) zdc rxn rxn Dzzdc ~ 2.5cm Dzrxn ~ 6.5cm zdc-bbc rxn-bbc rxn-zdc bbc bbc zdc Dzvtx (cm) crxn crxn crxn crxn = f * (aS-aN) / (aS+aN) crxn-bbc crxn-zdc crxn-rxn bbc zdc rxn Dzc/rxn ~ 5.1cm c’rxn - bbc c’rxn - bbc Dzvtx (cm) bbc c’rxn = func(crxn) c’rxn-bbc c’rxn-zdc c’rxn-rxn c’rxn Dzc’/rxn ~ 3.3cm Dz(c’+tdif)/rxn ~ 3.2cm rxn charge bbc zvtx

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