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Data Analysis: Variables in Real and Pure Data with Cuts

Analysis of variables in real and pure data sets with cut variables, focusing on decay lengths, transverse DCA, D0 mass, eta of parent particles, and probability distributions. Cuts applied to improve data quality and signal cleaning.

jerome
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Data Analysis: Variables in Real and Pure Data with Cuts

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  1. In the next slides, I look at some variables (possible cut variables) in real data (day109 – the light root file from this production) and pure data (power law pt) Since I used the pico file from this production, the real data distributions reflect the cuts we used (eg. Only +ve decay lengths)

  2. Transverse DCA to PV PureD0 Kaon Pion Real Data Kaon Pion

  3. σDCAXY PureD0 Kaon Pion Real Data Pion Kaon

  4. DCAXY/σDCAXY PureD0 Real Data Kaon Pion Motivation: http://www.star.bnl.gov/~bouchet/TCFIT/L_over_dl_cut_mix.ppt.htm

  5. DCAXY after cut |DCAXY/σDCAXY|>1 PureD0 Real Data Kaon Pion With a cut on DCAXY/σDCAXY > 1, entries with low DCAXY are removed.

  6. Decay Length with no offline cuts PureD0 Real Data We have cut slength>0 in the pico file

  7. Error of decay Length PureD0 Real Data

  8. dL/σdL PureD0 Real Data

  9. dL with a cut dL/σdL > 1 PureD0 Real Data With a cut dL/σdL > 1 the low values (~ below 100μm) of slength is removed.

  10. Probability of TcFit PureD0 Real Data Probability Vs TrackDcaKpi

  11. Cutting on probability D0 Mass pure with a cut on DcaKpi < 0.03 D0 Mass pure The bottom plots show D0 Mass distribution from pure data for different probability cuts. The bottom right plot combines a cut on probability and TrackDcaKpi (< 300um). The cuts prob > 0.05 and prob > 0.1 doesn’t seem to make much difference as far as cleaning up the signal.

  12. Eta of the Parent (D0) PureD0 Real Data |EtaD0|<1.85 may be tried as we did with last production

  13. dEdx Pion Kaon With a cut |ndEdx|<2 With a cut |ndEdx|<2 K and π bands with |nσ| < 1.5 With the new momentum dependent cut on dEdx we are retaining much more candidates. I think the current cut |nSigma|<2 would be good enough.

  14. Eta of the Parent (D0) PureD0 Real Data |EtaD0|<1.85 may be tried as we did with last production

  15. Possible cuts to use in pico file * New/changed cuts • Create a pico file with: • |Cos(θ*)|<0.6 • |EtaD0|<1.85 • |ndEdx|K < 2, |ndEdx|π < 2 • |RapidityD0| < 0.5 • Probability > 0.05 • ChargeK*ChargePi <0

  16. Back-Up

  17. DCAXY Vs probability

  18. Probability and DCAXY/σDCAXY

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