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FTPC status and results Summary of last data taken AuAu and dAu calibration : Data Quality Physic results with AuAu data –Spectra –Flow Physic results.

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Presentation on theme: "FTPC status and results Summary of last data taken AuAu and dAu calibration : Data Quality Physic results with AuAu data –Spectra –Flow Physic results."— Presentation transcript:

1 FTPC status and results Summary of last data taken AuAu and dAu calibration : Data Quality Physic results with AuAu data –Spectra –Flow Physic results with dAu data –Centrality definition –Strangeness

2 Maria Mora CorralSTAR Coll. Meeting, August032 Summary of RunIII FTPC successfully took ~20 10 6 dAu events and 8 10 6 pp events Changes since last AuAu/pp (2001-2002) run Increased gain Better resolution Frisch grid grounding problem fixed Better residuals +

3 Maria Mora Corral3 Data quality Vertex reconstruction with FTPC tracks with respect to TPC vertex : x,y ± 200 um AuAu data x,y ± 600 um dAu data r step [cm] hardware sector uncorrected corrected Inner cathode shift correction applied and works with reasonable precision. dAu data AuAu data

4 Maria Mora Corral4 Data quality II Cross-check: p T and dca for primaries in different sectors (  regions) Track parameters do not show any systematic effects. FTPC ready for physics!

5 Maria Mora CorralSTAR Coll. Meeting, August035 AuAu Minbias p T spectra Charged particles AuAu minbias 68k (47k) No corrections Quality Cuts: dca < 2.0 cm 0.1 <= p T < 1.0 GeV/c 3.0 <= |y    < 3.2 N hits >= 5 |vertex z | <= 25 cm 1/N event dN/(p t dp t ) [1/GeV 2 ] p t [GeV] west =0.409+-0.0077 GeV east =0.394+-0.0078 GeV FTPC West FTPC East

6 Maria Mora CorralSTAR Coll. Meeting, August036 FTPC pion acceptance

7 Maria Mora CorralSTAR Coll. Meeting, August037 AuAu: vs centrality centrality bin [GeV/c] FTPC west FTPC east calculated from power law fit in range p T [0.1,1.0] GeV/c No corrections Quality Cuts: dca < 3.0 cm 0.1 <= p T < 1.0 GeV/c 2.8 <= |  < 3.8 N hits >= 5 |vertex z | <= 25 cm Charged hadrons increase slightly with centrality Same behaviour as for charged particles at central rapidity (TPC)

8 Maria Mora CorralSTAR Coll. Meeting, August038 AuAu: vs |  |Pseudo-rapidity| [GeV/c] FTPC west FTPC east Charged hadrons with |pseudorapidity| Charged hadrons decrease slightly with pseudo-rapidity Similar behaviour as seen by NA49 and BRAHMS calculated from power law fit in range p T [0.1,1.0] GeV/c No corrections Quality Cuts: dca < 3.0 cm 0.1 <= p T < 1.0 GeV/c 2.5 <= |  < 3.5 N hits >= 5 |vertex z | <= 25 cm

9 Maria Mora CorralSTAR Coll. Meeting, August039 AuAu: forward-backward correlation String fusion model color strings = (small) areas in transverse space  can overlap, forming clusters (percolation) Overlapping of two color strings  3 independent regions can be distinguished : regions 1,2 no overlapping color field = color field of a single string overlap region 3 with color field of both strings summed Particle multiplicity is decreased while p T is enhanced  Forward/Backward correlations. Projection of two overlapping strings onto the transverse plane One observable: Forward/Backward correlation [Eur. Phys. J. C 16, 349-359 (2000)] Monte-Carlo model PSM 1.0 [Eur. Phys. J. C 22, 149-363 (2001)]

10 Maria Mora CorralSTAR Coll. Meeting, August0310 AuAu: forward-backward pt correlation = mean p T per event Forward;  = [2.8,3.8] Backward;  = [-3.8,-2.8] FTPCs sensitive and a good tool to study long range forward/ backward correlations The min. bias data do not show strong correlation (preliminary)

11 Maria Mora CorralSTAR Coll. Meeting, August0311 AuAu: Embedding Thanks Eric! Pt vs |  efficiency AuAu min. bias embedding  with p T flat [0., 2.0] * 10% of TPC multiplicity FTPC embedding has just taken off!! within |  = [2.8,3.8] efficiency nicely constant ~ 80%

12 Maria Mora CorralSTAR Coll. Meeting, August0312 AuAu: Flow, v 2 cumulant method V 2 calculation with cumulant method with TPC+FTPC particles  v 2 (%) Results unaffected by the missing sector (this method allows higher statistics). Cumulant method with 4 particles removes non-flow effects in v 2 Non-flow effects seem to be ~ 1% in TPC rapidity Non-flow effects do not affect FTPC region ?

13 Maria Mora Corral13 AuAu: v 2 and FTPC  p T (GeV/c) Cumulant method with 2 particles correlation can be used to determine v 2 with FTPC ALONE!! v 2 vs  and v 2 vs p T Good agreement with FTPC+TPC!

14 Maria Mora Corral14 AuAu: v 2 comparison V 2 vs  from STAR in comparison with PHOBOS data at 130 GeV and 200 GeV STAR sqrt(s)=200 PHOBOS sqrt(s)=130 STAR sqrt(s)=200 PHOBOS sqrt(s)=200 FTPC is involved in other flow studies: V 1, V 2 with event plane method, Higher harmonics (Markus O. Aihong T. and Art P. work) See Art P.’s talk on Saturday

15 Maria Mora Corral15 dAu: FTPC defines centrality Hijing simulation 50k dAu minbias z-Vertex <= |60| cm HIJING simulation shows a correlation between the impact parameter and the FTPC East multiplicity FTPC data are used for STAR centrality definition

16 Maria Mora CorralSTAR Coll. Meeting, August0316 dAu: Strangeness,  s   p  - (63.9%), m  =1115.7 MeV, c  =7.89 cm * Study all pos-neg pairs, assuming p mass and  mass (FTPC measures charge but no particle Id). * Geometrical cuts for pairs Decay length > 10 cm Pair dca < 2.5 mm Proton-like dca [0.1, 2] cm Pion-like dca > 1.5 cm Background estimation with rotated tracks: Every track is rotated 180 o in  and combined with all non-rotated tracks with opposite charge Same event characteristic, (mult, flow, vertex)

17 Maria Mora CorralSTAR Coll. Meeting, August0317 dAu:  and  signal 5.8 M events dAu min bias in FTPC West only (better calibration)  yield = ~4000 Row Ratio  = ~0.47  yield = ~1900 Hijing  ratio = 0.64 and with same cuts = 0.46 Real pairs Background pairs  Real pairs Background pairs  

18 Maria Mora CorralSTAR Coll. Meeting, August0318 Summary AuAu, dAu, pp data with the FTPC available. Calibrations : AuAu complete, dAu near final, pp is being checked by Mirko P. First physics results on flow. Preliminary uncorrected charged particle spectra and  and  yields. Embedding is in progress for efficiency determination. FTPC available for data taking in Run IV.

19 Maria Mora CorralSTAR Coll. Meeting, August0319 FTPC group Volker Eckardt María Mora Corral Markus Oldenburg Jörn Putschke Janet Seyboth Peter Seyboth Frank Simon … and lots of help from STAR people, specially : Eric, Jerôme, Lidia, Jeff …

20 Maria Mora CorralSTAR Coll. Meeting, August0320 FTPC pion acceptance

21 Maria Mora CorralSTAR Coll. Meeting, August0321 AuAu efficiency

22 Maria Mora CorralSTAR Coll. Meeting, August0322 dAu efficiency |vertex z | < 20cm

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