1. Run4 fK+K- analysis update
Dipali Pal
Vanderbilt University
Light/Heavy PWG meeting
June 2, 2005

2. Dataset Minimum-bias CNT files
Used both ++ and -- field runs from stripe 1-3.
|bbcz| < 30 cm
Nevt = 85M (++ field)
= 55M (-- field)
Standard single and pair cuts.
(CabanaBoy)

3. Data MC fiducial region studies: TOF – TOF (++ field, positive tracks)
Before
After
For details of
fiducial matches
please see Charlie’s
slides in June 6
Global/Hadron
Meeting.
Need to re-address
the issues with
Dch dead channel
map.

4. Data MC fiducial region studies: TOF – TOF (++ field, negative tracks)
Before
After

5. Data MC fiducial region studies: TOF – TOF (-- field, positive tracks)
Before
After

6. Data MC fiducial region studies: TOF – TOF (-- field, negative tracks)
Before
After

7. TOF – TOF mT spectra (++ field runs)
Used the same
embedding and
run-by-run
efficiencies as
Run2.

8. TOF – TOF mT spectra (-- field runs)
Used the same
embedding and
run-by-run
efficiencies as
Run2.

9. Comparison of Minimum bias mT spectra between Run2 and Run4

10. Run2 and Run4 dN/dy and T: TOF-TOF
Run Run4(++ field) Run4(-- field)
MB / / /
0-10% / / /
10 – 40% / / /
40 – 90% / / /
MB / / /- 20
0-10% / / /- 29
10-40% / / /- 25
40-90% / / /- 27
T (MeV)

11. Summary Fiducial acceptance in data and MC is being studied.
-- First version of fiducial cuts applied.
-- TOF shows substantial mismatch between data and MC (See Charlie’s presentation in June 6 Global/hadron PWG).
-- There are still issues related to Dch dead channel map.
dN/dy and T has been extracted from TOF-TOF combination in both ++ and – field runs.
dN/dy and T are consistent between ++ and – field runs.