ANALYSIS AT CERN

KAZUKI OSHIMA

2 particle correlation about Pb-Pb 3.52TeV

OUTLINE

• 2 particle correlation

• Event mixing

• Cut

• Result

2 PARTICLE CORRELATION

Get ΔΦ Δη about all trigger and associate tpc track pairs

Devide event about centrality and Z vertex

Pool into 10 × 10 Box

Become 3 events, get 2 particle correlation

3 real part & 6 event mixing pairs

Calculate correlation function

EVENT MIXING

EVENT SELECTION

Use ESD file LHC11h(2) Pb-Pb 3.57 TeV

Run number

168988,170269,169837,168108,169238,170207

Event Cut

• |Zvertex|<10cm ESD Track cut

• TPC acceptance |Δη|<0.9• ITS matching

RESULT

CENTRALITY DEPENDENCE

trigger 2-3GeV, associate 1-2GeV

ETA PROJECTION

• 1.0<|Δη| <1.8

• Fit by Fourier series

VN PLOT

v1 v2 v3

v4 v5 v6

(x,y):(centrality,vn)

TRIGGER DEPENDENCEProjection about Centrality 0-10%

V2 TRIGGER DEPENDENCE

2-3GeV

3-4GeV

5-6GeV

4-5GeV

centrality

OUTLOOK

Look again fitting error

move associate pt fixed 1-2GeV this time

Calculate severally vn

Consider more event cut and quality track cut

to remove something like v2 of eta direction