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f K + K - analysis in run4 Au-Au collisions at s NN = 200 GeV

This project aims to analyze f mesons in Au-Au collisions at 200 GeV focusing on line shape, meson yield, centrality dependence, Rcp and RAA ratios, elliptic flow, and invariant mass spectrum of f -> K+K-. The analysis involves momentum calibration, centroid and width studies, momentum corrections, and v2 measurements. Key tasks include data processing, simulation, calibration, QA checks, and systematic error evaluation. The study aims to reduce statistical errors and improve the understanding of f meson properties. Initial results show promising outcomes for Run4 compared to Run2.

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f K + K - analysis in run4 Au-Au collisions at s NN = 200 GeV

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  1. fK+K- analysis in run4 Au-Au collisions at sNN = 200 GeV Dipali Pal Vanderbilt University Analysis Fest Light/ Heavy PWG May 12, 2005

  2. Introduction: Analysis goals • f  K+K- line shape analysis: Large number of centrality bins. • f meson yield analysis (mT spectra, dN/dy and T) over at least 10 centrality bins and larger number of mT bins than Run2. • Centrality dependence of the f yield. Needed to study transition of f meson yield in p-p  d-Au  Au-Au systems. • Rcp, RAA of f mesons 5. f/p and f/K ratios over 10 centrality bins and different pT bins. 6. Elliptic flow analysis of the f mesons.

  3. f K+K- invariant mass spectrum Uncalibrated momenta <m> = 1.02006 +/- 0.00010 GeV G = 5.30 +/- 0.31 MeV <m> = 1.01997 +/- 0.00009 GeV G = 4.75 +/- 0.24 MeV Applied 2% Momentum scale recalibration <m> = 1.01880 +/- 0.000135 GeV G = 4.82 +/- 0.40 MeV <m> = 1.01892 +/- 0.00010 GeV G = 4.37 +/- 0.28 MeV Momentum corrections improved the f width by 0.4 MeV Improvement in width expected with a more accurate momentum value

  4. Centroids are flat with centrality Widths are consistent with PDG at all centralities Previously reported width increase with centrality disappeared by momentum correction. Line shape analysis mf = 1.019456 GeV G = 4.24 MeV

  5. mT spectrum from TOF-TOF analysis Minimum-bias • -- Embedding and run-by-run corrections were taken from Run2 • -- PPG016 TOF-TOF dN/dy = 1.16 +/- 0.17 (stat) +/- 0.19 (syst) • T (MeV) = 380 +/- 18 +/- 22 • Need to apply run4 embedding corrections data – MC tuning corrections (fiducial cuts) run-by-run corrections

  6. v2 of f We shall compute v2 of f mesons by measuring azimuthal asymmetries with respect to the reaction plane. For example: Run2 Au-Au collisions @ sNN = 200 GeV • Run2 analysis showed large • statistical errors. • Expect to get 30 times more f • than Run2. • Reduction of statistical error by a factor of 5 – 6. Note: The CabanaBoy system still has problems with handling the needed number of event classes (Z vertex, Centrality, Reaction Plane). The extraction of v2 depends upon having the adding reaction plane dimension.

  7. Tasks done • Code is ready to go for analysis train • Simulation (Event  PISA  (n)DST) is completed. • Initial data scan for f meson reconstruction is completed (shown to PWG). • Hadron PID calibration with EMCAL is finished. Tasks to be done • Run-by-run QA • Embedding • Simulation studies to calculate f mass resolution. • Data – MC tuning  Fiducial studies for data and MC. • Systematic errors. • v2 analysis (following the techniques discussed during Run2 analysis).

  8. Other issues • Need help with getting a good run list on the basis of subsystem QA. • The first version of the analysis note is anticipated in early June. • Will request for preliminary after that.

  9. Backup slide-1 (before applying 2% momentum scale) (after applying 2% momentum scale)

  10. Backup slide 2 f meson line shape before 2% momentum scale recalibration

  11. Data and MC fiducial checks Data MC ++ field MC Data - - field

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