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p + p Analysis. K. Hagel Cyclotron Institute Texas A & M University BRAHMS Collaboration Meeting Oslo, Norway 12-May-2004. Short History of Ratio p+p story. Had what we believed to be almost complete analysis one year ago. Preliminary results shown at DNP at MSU
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p + p Analysis K. Hagel Cyclotron Institute Texas A & M University BRAHMS Collaboration Meeting Oslo, Norway 12-May-2004
Short History of Ratio p+p story • Had what we believed to be almost complete analysis one year ago. • Preliminary results shown at DNP at MSU • Discovered bug in track projection when using INEL counters; fixed it • Re-did entire chain • Results seem to be “messed up” • Statistics, binning, other mistake • Quality of data • Following details analysis chain I used Brahms Collaboration Meeting
Cuts on the Data • INEL Vertex cut • Trigger cut (6 for FS, 3 for MRS) • Track-Vertex cut • Detector Fiducial cut • Swim status cut • Pid cut • Rapidity cut Brahms Collaboration Meeting
INEL Vertex Cut • MRS: -15 to 15cm • FS: -25 to 20cm • No bins in vtx in this analysis as this did not appear to change the results in a previous analysis. Brahms Collaboration Meeting
Track - Vertex Cut • Project track to beam • Take difference between track vertex and INEL vertex • Apply 2σ cut Brahms Collaboration Meeting
MRS Detector Fiducial Cut Brahms Collaboration Meeting
FS Detector Fiducial Cut Brahms Collaboration Meeting
Pid Cut • MRS • momentum dependent cuts in MRS • Centroids of p-dependent cuts adjusted run by run. • FS • Some momentum dependent cuts • Others straight where possible Brahms Collaboration Meeting
Run dependent centroids(MRS) Brahms Collaboration Meeting
MRS p-dependent windows Brahms Collaboration Meeting
FS pid windows Brahms Collaboration Meeting
FS pid windows Brahms Collaboration Meeting
FS pid windows Brahms Collaboration Meeting
FS pid Brahms Collaboration Meeting
FS pid Brahms Collaboration Meeting
Acceptance (Total) Brahms Collaboration Meeting
Acceptance (Accepted) Brahms Collaboration Meeting
Normalized Uncorrected Spectra(MRS) Brahms Collaboration Meeting
Normalized Uncorrected Spectra(FS) Brahms Collaboration Meeting
MRS Ratios Brahms Collaboration Meeting
FS Ratios Brahms Collaboration Meeting
y-dependence of ratios Brahms Collaboration Meeting
Summary • Have a complete analysis • Bjorn has comparisons of our results • Refinements to data analysis? • Towards publication • Should be fast although already slow • Towards spectra • Already have some preliminary spectra • They probably suffer from any problems that might be in here. Brahms Collaboration Meeting