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New Physics Results from the FTPC Joern Putschke for the STAR FTPC group

New Physics Results from the FTPC Joern Putschke for the STAR FTPC group. FTPC calibration finshed :-). Thanks to all who helped us ! Special thanks to Jerome, Lidia and Jeff. Outline. AuAu calibration quality Flow news v 1 (Aihong) AuAu minbias spectra <pt> vs. centrality

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New Physics Results from the FTPC Joern Putschke for the STAR FTPC group

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  1. New Physics Results from the FTPC Joern Putschke for the STAR FTPC group

  2. FTPC calibration finshed :-) Thanks to all who helped us ! Special thanks to Jerome, Lidia and Jeff Joern Putschke / STAR Analysis Meeting

  3. Outline • AuAu calibration quality • Flow news v1 (Aihong) • AuAu minbias spectra • <pt> vs. centrality • multiplicity FTPC/TPC • Forward / backward <pt> correlation • dAu centrality definition • dAu spectra • Outlook & toDo • analysis plans • dAu / pp calibration status Joern Putschke / STAR Analysis Meeting

  4. uncorrected corrected rstep [cm] hardware sector AuAu calibration quality Vertex reconstruction with FTPC tracks with respect to TPC vertex : x,y +- 200 mu z +- 0.5 cm Inner cathode shift correction applied and works with reasonable precision. For more details on calibration look at (under construction) : http://wwwstar.mppmu.mpg.de/ftpc_calibration_page/index.html Joern Putschke / STAR Analysis Meeting

  5. Flow news (v1) v1 signal improved with final calibrated FTPC AuAu minbias dataset ! v2 on the way ... Flow with FTPCs looks very promising ! (Aihong Tang) Joern Putschke / STAR Analysis Meeting

  6. 1/Nevent dN/(pt dpt) [1/GeV2] pt [GeV] AuAu minbias pt distribution <pt>west=0.409 GeV <pt>east=0.394 GeV AuAu minbias 68k (47K) no corrections dca<2cm 0.1<=pt<1 3<=y_pion<3.2 n_hits>=5 |vertex_z|<=25 Joern Putschke / STAR Analysis Meeting

  7. <pt> [GeV] FTPC west FTPC east centrality bin <pt> vs. centrality Only slight centrality dependence of <pt> for charged hadrons visible in the FTPCs. Same behaviour as for pions in the TPC. Joern Putschke / STAR Analysis Meeting

  8. <dN/dNch> FTPC west FTPC east Nch ref,TPC centrality bin Nch,FTPC Multiplicity FTPC/TPC dummy dca<2cm 0.1<=pt<1 2.9<=eta<3.5 n_hits>=5 |vertex_z|<=25 Joern Putschke / STAR Analysis Meeting

  9. String fusion modell Joern Putschke / STAR Analysis Meeting

  10. with string fusion, no resc. without string fusion, no resc. AuAu minbias Forward / backward <pt> correlation Joern Putschke / STAR Analysis Meeting

  11. Impact parameter vs. multiplicity FTPC east 50k dAu minbias Hijing z-Vertex <= |60| cm Joern Putschke / STAR Analysis Meeting

  12. 1/NeventsdN/dNch # primary tracks FTPC east dAu Multiplicity FTPC east |vertexz| <= 50cm dca <= 3cm 2.8 <= || < 3.8 nhits >= 5 triggerID cut (minbias) Joern Putschke / STAR Analysis Meeting

  13. # prim. tracks FTPC east dca [cm] Multiplicity FTPC east vs. vertex-z Slight Vertex-z dependence of FTPC east multiplicity for vz>30 cm could be explained due to <dca> shift and used dca cut < 3cm to minimize background and fake tracks. <dca> shift due to missalignement of FTPCs (not calibrated yet) ! Joern Putschke / STAR Analysis Meeting

  14. percent of events run day Centrality FTPC east |vertexz| <= 50cm dca <= 3cm 2.8 <= || < 3.8 nhits >= 5 triggerID cut (minbias) Joern Putschke / STAR Analysis Meeting

  15. <pt>west=0.36 GeV <pt>east=0.367 GeV 1/Nevent dN/(pt dpt) [1/GeV2] pt [GeV] dAu pt distribution dAu minbias 1.2 M (370K) no corrections dca<2cm 0.1<=pt<1 3<=y_pion<3.2 n_hits>=5 |vertex_z|<=25 Joern Putschke / STAR Analysis Meeting

  16. minBias zdcw<=17 zdcw>17 1/NeventsdN/dNch # primary tracks FTPC east FTPC east multiplicity neutron tag Joern Putschke / STAR Analysis Meeting

  17. FTPC east FTPC west 1/Nevent dN/(pt dpt) [1/GeV2] 1/Nevent dN/(pt dpt) [1/GeV2] pt [GeV] pt [GeV] <pt>zdcw>17 =0.352 GeV <pt>zdcw<=17=0.369 GeV <pt>zdcw>17 =0.359 GeV <pt>zdcw<=17=0.360 GeV dAu pt distribution neutron tag dummy Joern Putschke / STAR Analysis Meeting

  18. Outlook & toDo • Analysis plans • AuAu minbias spectra, flow ... Joern Putschke / STAR Analysis Meeting

  19. The STAR FTPC group • Volker Eckardt • Peter Maierbeck • Maria Mora Corral • Markus Oldenburg • Joern Putschke • Janet Seyboth • Peter Seyboth • Frank Simon Joern Putschke / STAR Analysis Meeting

  20. FTPC pion acceptance Joern Putschke / STAR Analysis Meeting

  21. AuAu efficiency Joern Putschke / STAR Analysis Meeting

  22. dAu efficiency |vertexz| < 20cm Joern Putschke / STAR Analysis Meeting

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