Update on Conversions SCIPP ATLAS Meeting February 17 2009 Bruce Schumm, UCSC/SCIPP.

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Presentation transcript:

Update on Conversions SCIPP ATLAS Meeting February Bruce Schumm, UCSC/SCIPP

Step I: Reconstruction Have migrated from with two patches to standard (confirmed with Thomas Koffas that this is current best) Reconstruct 50 events of GMSB2 for now – will need to increase by x10 or more soon. Large GMSB1 samples reconstructed in , which (I’m fairly sure) is not appropriate for conversions.

Step II: Find the Conversions Am now using the conversion in the standard EGamma list rather than those in the Conversion container  much more filtered. Number of reconstructed conversions down by factor of Step III: Truth Matching Have worked through “track” truth matching for conversions (thanks to code snippet from Thomas). Truth match only if an electron or positron from a photon conversion (1-track conversions) or one electron and one positron from a photon conversion (2-track conversions). 52/85 ~ 60% are truth matched, but…

Step III: Rconstruction Comparison for Truth- Matched Conversions (compare true photons with EGamma reconstructed photon ) Define momentum difference P as P = (p reco – p truth )/p truth Let R be the three-dimensional angle between the true and reconstructed photon. Let O between the difference in the true and reconstructed radial position of the conversion.

3D Angular Separation Closest True Conversion Truth-Matched Conversion GMSB2 Low Statistics

Momentum Difference Closest True Conversion Truth-Matched Conversion GMSB2 Low Statistics

Difference in Radius of Origin Truth-Matched Conversion Next, look with higher stats (150 events  150 events), and separate between 1- and 2-track conversions GMSB2 Low Statistics

GMSB2 3D Angular Separation GMSB2 Higher Statistics All Truth- matched Conversions Two-track Conversions One-track Conversions

GMSB2 Momentum Difference GMSB2 Higher Statistics All Truth- matched Conversions Two-track Conversions One-track Conversions

And try GMSB1… 3D Angular Separation GMSB2 (300 Events) All Truth- matched Conversions Two-track Conversions One-track Conversions

GMSB1 Momentum Difference GMSB1 (300 Events) All Truth- matched Conversions Two-track Conversions One-track Conversions

Some ideas for what to do next… *) Just look at GMSB conversions (almost all set up to do that *) Look at the individual truth-matched electron/positron tracks *) Look at truth-matched pions to see if bremsstrahlung is causing trouble…