Download - Data Analysis Practice looking for Φ(1020)
Data Analysis Practicelooking for Φ(1020)
2006. 12. 12Nuclear Physics Ⅲ
Kyung-Eon,Choi
Contents
• NA49 detector • Φ(1020) study• Data Set • Analysis strategy• Analysis procedure• Find Φ peak• Others..
NA49 Detector Setup
Main TPC
Vertex TPC 1
Vertex TPC2
Beam
Φ (1020)
• Mass m = 1019.456 +- 0.020 MeV
• Full width Γ = 4.26 +- 0.05 MeV
< Decay mode >K+K- (49.1 +- 0.6 %) (34.0 +- 0.5 %)SLKK 00
My Way ~!!
Data Set
• Run Type – 01I : Pb+Pb 160 AGeV central 256 TB
• Event– Total event : 2,968,504– Used event :
• Track – Accepted Track :
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
dEdx - p - m Histogram
dEdx - p - m (kaon cut)
dEdx - p - m (proton cut)
dEdx - p
Slice
dEdx - fit
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..
Event Cut
Track Cut
Result
Compare with yoo’s result
Mean Sigma
Choiku’s
1018.35 MeV
3.9 MeV
Yoo’s 1018.10 MeV
3.3 MeV
ParticleDatabo
ok
1019.456 MeV
4.26 MeV
Another interest ~!! Kaon(Strangeness) Suppression??
or Strangeness Enhancement??