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f  K+K- analysis in Run4 Au+Au collisions

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Presentation on theme: "f  K+K- analysis in Run4 Au+Au collisions"— Presentation transcript:

1 f  K+K- analysis in Run4 Au+Au collisions
Dipali Pal Vanderbilt University

2 Embedding corrections
We are using run-2 embedding corrections (properly weighted by phi yields in different subsystems).

3 mT spectra: Different subsystem combinations - I
Generated minimum bias mT spectra for different subsystem combinations: TOF – TOF, TOF – East, East – East and West – West Emphasizes the full PHENIX capability (Need preliminary for this plot)

4 mT spectra: Different subsystem combinations - II
dN/dy T (MeV) TOF-TOF / /- 12 TOF-East / /- 15 East-East / /- 26 West-West / /- 15

5 mT spectra: Different subsystem combinations - III
Fitted all mT spectra within the same mT range: 1.6 < mT < 2.2 GeV/c2 0 – 90% dN/dy T (MeV) TOF-TOF / /- 84 TOF-East / /- 32 East-East / /- 38 West-West / /- 27 Fitting range: 1.6 < mT (GeV/c2) < 2.2 dN/dy and T are consistent within errors 0 – 90%

6 Minimum bias mT spectrum from the full central arm
dN/dy = /- 0.03 T = 371 +/- 6 MeV Run2: dN/dy = / (stat) +/ (syst) T = 366 +/- 11 (stat) +/- 18 (syst) Need preliminary on this plot

7 mT spectra at different centralities
T remains the same within the first six centrality bins.

8 dN/dy and T vs Centrality
Need preliminary on these two plots dN/dy increases almost linearly with Npart T is consistent with Run2. For the extreme peripheral bin (absent in Run2), T drops.

9 Rcp Rcp of f is consistent with pi-zero’s.
Run4 statistics allows us to measure Rcp using more peripheral bin than Run2. (Run2 peripheral: 40-92% Run4 peripheral: 60-92%) Need preliminary on this plot

10 Subsystem comparison dNdy: TOF – TOF : 1.13 +/- 0.12 +/- 0.22
TOF – EAST: / /- 0.20 EAST-EAST: / /- 0.17 WEST-WEST: / /- 0.20 ALL: / /- 0.19 T (MeV): TOF-TOF: 369 +/- 12 +/- 22 TOF-EAST: 357 +/- 15 +/- 36 EAST-EAST: 318 +/- 26 +/- 40 WEST-WEST: 333 +/- 16 +/- 41 ALL: 371 +/- 6 +/- 24

11 Comparison between VU and WIS spectra

12

13 Comparison-II VU

14 Mt spectra at Different centralities

15 Centrality dependence
No embedding correction applied yet

16 Backup slide-1 Systematic checks on different subsystems

17 Correction factors

18 Number of f’s from different subsystems Nevt = 170927276
Nf (% of the total) TOF - TOF 3438 (9%) TOF-EAST 9777 (27%) EAST-EAST 3227 (9%) WEST-WEST 20395 (55%) Total 36827 (100%)

19 Run-by-run corrections
We used the same method as our Run2 fK+K- (PPG016) analysis for run-by-run efficiency determination. Field TOF-TOF TOF-EAST EAST-EAST WEST-WEST

20

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