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

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Presentation transcript:

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

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

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)

mT spectra: Different subsystem combinations - II dN/dy T (MeV) TOF-TOF 1.13 +/- 0.12 367 +/- 12 TOF-East 1.05 +/- 0.06 357 +/- 15 East-East 1.06 +/- 0.12 318 +/- 26 West-West 1.18 +/- 0.06 333 +/- 15

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 1.18 +/- 0.32 382 +/- 84 TOF-East 1.06 +/- 0.13 341 +/- 32 East-East 1.20 +/- 0.25 294 +/- 38 West-West 1.25 +/- 0.15 321 +/- 27 Fitting range: 1.6 < mT (GeV/c2) < 2.2 dN/dy and T are consistent within errors 0 – 90%

Minimum bias mT spectrum from the full central arm dN/dy = 1.05 +/- 0.03 T = 371 +/- 6 MeV Run2: dN/dy = 1.34 +/- 0.09 (stat) +/- 0.21 (syst) T = 366 +/- 11 (stat) +/- 18 (syst) Need preliminary on this plot

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

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.

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

Subsystem comparison dNdy: TOF – TOF : 1.13 +/- 0.12 +/- 0.22 TOF – EAST: 1.05 +/- 0.06 +/- 0.20 EAST-EAST: 1.06 +/- 0.12 +/- 0.17 WEST-WEST: 1.18 +/- 0.06 +/- 0.20 ALL: 1.05 +/- 0.03 +/- 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

Comparison between VU and WIS spectra

Comparison-II VU

Mt spectra at Different centralities

Centrality dependence No embedding correction applied yet

Backup slide-1 Systematic checks on different subsystems

Correction factors

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%)

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 ++ 0.9326 0.8027 0.9373 0.8781 -- 0.7761 0.8493 1.007 0.9667