p + p AnalysisK. HagelCyclotron InstituteTexas A & M University

BRAHMS Collaboration MeetingOslo, Norway12-May-2004

Brahms Collaboration Meeting

Short History of Ratio p+p storyHad what we believed to be almost complete analysis one year ago.Preliminary results shown at DNP at MSUDiscovered bug in track projection when using INEL counters; fixed itRe-did entire chainResults seem to be messed upStatistics, binning, other mistakeQuality of dataFollowing details analysis chain I used

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Cuts on the DataINEL Vertex cutTrigger cut (6 for FS, 3 for MRS)Track-Vertex cutDetector Fiducial cutSwim status cutPid cutRapidity cut

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INEL Vertex CutMRS: -15 to 15cmFS: -25 to 20cmNo bins in vtx in this analysis as this did not appear to change the results in a previous analysis.

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Track - Vertex CutProject track to beamTake difference between track vertex and INEL vertexApply 2 cut

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MRS Detector Fiducial Cut

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FS Detector Fiducial Cut

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Pid CutMRSmomentum dependent cuts in MRSCentroids of p-dependent cuts adjusted run by run.FSSome momentum dependent cutsOthers straight where possible

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Run dependent centroids(MRS)

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MRS p-dependent windows

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FS pid windows

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FS pid windows

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FS pid windows

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FS pid

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FS pid

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Acceptance (Total)

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Acceptance (Accepted)

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Normalized Uncorrected Spectra(MRS)

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Normalized Uncorrected Spectra(FS)

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MRS Ratios

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FS Ratios

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y-dependence of ratios

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SummaryHave a complete analysisBjorn has comparisons of our resultsRefinements to data analysis?Towards publicationShould be fast although already slowTowards spectraAlready have some preliminary spectraThey probably suffer from any problems that might be in here.

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