Christof Roland / MITQuark Matter 2004January 2004 Christof Roland / MIT For the NA49 Collaboration Quark Matter 2004 Oakland,CA Event-by-Event Fluctuations.

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Presentation transcript:

Christof Roland / MITQuark Matter 2004January 2004 Christof Roland / MIT For the NA49 Collaboration Quark Matter 2004 Oakland,CA Event-by-Event Fluctuations of Particle Ratios

Christof Roland / MITQuark Matter 2004January 2004 Motivation Energy dependence of the /<   ratio Event-by-event fluctuations of the (K + +K -) /(  + +  - ) ratio at 160 GeV Phys. Rev. Lett (2001) What is the energy dependence of the fluctuation signal? ?

Christof Roland / MITQuark Matter 2004January 2004 The NA49 Detector

Christof Roland / MITQuark Matter 2004January 2004 Event-by-Event estimation of the particle ratios One Event: Event Ensemble: log(p tot [GeV]) Probability density function: log(p tot [GeV]) Fit dE/dx spectra in 4D binning Extract ratios with maximum likelihood fit Vary relative normalization of the particle species (K/ ,p/  ) in the PDF

Christof Roland / MITQuark Matter 2004January 2004 Extracting the Fluctuation Signal Compare data to mixed events:   data -   mix =   dynamic Process the relative widths of the distributions:  = RMS/Mean * 100 [%] + Dynamical Fluctuations  = 2.8% E-by-E K/  ratio Events + Finite Number Statistics Experimental Resolution  = 15.9%  = 16.7% E-by-E K/  ratio Events Statistical fluctuations = “mixed” Events  = 23.1% E-by-E K/  ratio Events = “Data” Events E-by-E K/  ratio  = 23.27% Events

Christof Roland / MITQuark Matter 2004January 2004 Acceptance 20 GeV: 40 GeV:160 GeV:

Christof Roland / MITQuark Matter 2004January 2004 Event Selection Select 3% most central events at all energies Selection based on energy of projectile spectators Tight selection to prevent remaining centrality dependence of K/  within the event sample Event Statistics Beam EnergyEventsTracks/Event Data Set 1Data Set 2 20 GeV140 k GeV170 k GeV160 k GeV140 k GeV120 k450560

Christof Roland / MITQuark Matter 2004January 2004 Error Estimate Systematic checks dE/dx stability Linearity of the e-by-e estimators Various  dyn extraction methods All methods tested successfully on MC events Systematic errors from processing two data sets Vary track selection and multiplicity per event Data points from arithmetic mean Systematic error from the difference in the data points

Christof Roland / MITQuark Matter 2004January 2004 The E-by-E Kaon/Pion Ratio NA49 Preliminary Data Set GeV 20 GeV

Christof Roland / MITQuark Matter 2004January 2004 The E-by-E Kaon/Pion Ratio NA49 Preliminary Data Set 1 Data Set 2

Christof Roland / MITQuark Matter 2004January 2004 The E-by-E Kaon/Pion Ratio Increased fluctuation signal at lower beam energies NA49 Preliminary

Christof Roland / MITQuark Matter 2004January 2004 The E-by-E Proton/Pion Ratio

Christof Roland / MITQuark Matter 2004January 2004 The E-by-E Proton/Pion Ratio NA49 Preliminary The e-by-e distribution of the proton/pion ratio is narrower for data than for mixed events Effect is more pronounced at low beam energies

Christof Roland / MITQuark Matter 2004January 2004 The E-by-E Proton/Pion Ratio Gedanken Experiment: All protons and pions from resonances Check influence of resonances in an Event Generator Resonance Production, Toy MC

Christof Roland / MITQuark Matter 2004January 2004 The UrQMD Event Generator Process UrQMD events like data Generate large samples, O(30k) events Relative contribution of resonances changes with beam energy K/  fluctuation signal independent of beam energy Weak influence of resonances Non zero value due to energy-, strangeness conservation p/  fluctuation signal shows similar trend like data

Christof Roland / MITQuark Matter 2004January 2004 Summary K/  fluctuations increase towards lower beam energy Significant enhancement over hadronic cascade model p/  fluctuations are negative indicates a strong contribution from resonance decays NA49 Preliminary

Christof Roland / MITQuark Matter 2004January 2004 END

Christof Roland / MITQuark Matter 2004January 2004 Error Estimate Systematic checks dE/dx stability Linearity of the e-by-e estimators Various  dyn extraction methods All methods tested successfully on MC events Systematic errors from processing two data sets Vary track selection and multiplicity per event Data points from arithmetic mean Systematic error from the difference in the data points

Christof Roland / MITQuark Matter 2004January 2004 Results on Kaon/pion (tight)

Christof Roland / MITQuark Matter 2004January 2004 Results on Kaon/pion (lose)

Christof Roland / MITQuark Matter 2004January 2004 Results on Kaon/pion UrQMD

Christof Roland / MITQuark Matter 2004January 2004 Results on proton/pion(tight)

Christof Roland / MITQuark Matter 2004January 2004 Results on proton/pion(lose)

Christof Roland / MITQuark Matter 2004January 2004 Results on proton/pion URQMD The e-by-e proton/pion ratio for data is narrower than the mixed event distribution