1. Data Analysis Practice looking for Φ(1020) 2006. 12. 12 Nuclear Physics Ⅲ Kyung-Eon,Choi

2. Contents NA49 detector Φ(1020) study Data Set Analysis strategy Analysis procedure Find Φ peak Others..

3. NA49 Detector Setup Main TPC Vertex TPC 1 Vertex TPC2 Beam

4. Φ (1020) Mass m = 1019.456 +- 0.020 MeV Full width Γ = 4.26 +- 0.05 MeV K+K- (49.1 +- 0.6 %) (34.0 +- 0.5 %) My Way ~!!

5. Data Set Run Type –01I : Pb+Pb 160 AGeV central 256 TB Event –Total event : 2,968,504 –Used event : Track –Accepted Track :

6. Analysis Strategy Draw dEdx-p histogram Using dEdx-m histogram for cut Slice dEdx-p histogram Fit sliced histogram & Save parameters Mark with a dot using Saved parameters (dEdx-βγ graph) Fit with Bethe-Bloch formula Use parameters as cuts Mix particles using cuts & Mixing method

7. dEdx - p - m Histogram

8. dEdx - p - m (kaon cut)

9. dEdx - p - m (proton cut)

10. dEdx - p

11. Slice

12. dEdx - fit

13. Cuts EventCut –Vertex X & Y: -1 ~ 1 cm –Vertex Z : -582 ~ -580 cm – Multiplicity : 700 ~ 1500 K+ Cut (PosParticleList) –Charge : 1 –Bx (impact parameter) : -5~5 cm –By : -2 ~2 cm –Momentum Range : 3<p<100 –Mass2 : 0.12 < m2 < 0.36 –SetDedxSigma : 0.9 ~ 1.03 K- Cut (NegParticleList) –Charge : -1 –Bx (impact parameter) : -5~5 cm –By : -2 ~2 cm –Momentum Range : 3<p<100 –Mass2 : 0.12 < m2 < 0.36 –SetDedxSigma : 0.9 ~ 1.03 I don’t need PID..

14. Event Cut

15. Track Cut

16. Result

17. Compare with yoo’s result MeanSigma Choiku ’s 1018.3 5 MeV 3.9 MeV Yoo’s1018.1 0 MeV 3.3 MeV Particl e Databo ok 1019.4 56 MeV 4.26 MeV

18. Another interest ~!! Kaon(Strangeness) Suppression?? or Strangeness Enhancement??