pi-Xi correlations

1
pi-Xi correlations
Petr Chaloupka
LBL Soft Hadron Physics Group meeting
2
Event selection
Year2 200GeV AuAu data 10.7M MinBias and
Central events from file catalogue full field
and reversed full field no half field
different acceptance Year4 62GeV AuAu data
12.7M production62 files from catalogue 4M
MinBias events
3
Data prefiltering
HBT analysis on the whole data too slow many
events, few Xis 10 days Two stage filtering
a) Remove most of Xi candidates- keeping
1/1000 candidates saving into HbtNanoDst
structure 100GB b) Split into centrality
classes loose Xi cuts. This allows to run the
whole analysis in couple hours we can tweak the
cuts.
4
(No Transcript)
5
(No Transcript)
6
(No Transcript)
7
(No Transcript)
8
62GeV AuAu
C(k) Xi- pi- centrality 40-80
C(k) Xi- pi centrality 40-80
Correlation function has in general the same
behaviour as in 200GeV data That also means the
same problems ....
9
(No Transcript)
10
(No Transcript)
11
To Do List
Cut tuning Study influence of cuts and possible
misidentification Xi purity correction Pion
purity correction we use same cuts for pions as
Mercedes in 200GeV pi-pi paper Fit the
correlation function using model from Scott Prat
Please, CONTINUE reading !!!
12
(No Transcript)
13
Minv for 62GeV data
centrality 0-10
centrality 0-5
centrality 10-40
centrality 40-80
14
200GeV AuAu 0-5
C(k) Xi pi
C(k) Xi- pi-
C(k) Xi pi-
C(k) Xi- pi
15
(No Transcript)
16
(No Transcript)
17
62GeV AuAu 0-10
C(k) Xi pi
C(k) Xi- pi-
C(k) Xi pi-
C(k) Xi- pi
18
62GeV AuAu 10-40
C(k) Xi pi
C(k) Xi- pi-
C(k) Xi pi-
C(k) Xi- pi
19
62GeV AuAu 40-80
C(k) Xi- pi-
C(k) Xi pi
C(k) Xi- pi
C(k) Xi pi-