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Non-Pointing Photon Work at UC Santa Cruz / SCIPP

Non-Pointing Photon Work at UC Santa Cruz / SCIPP. ATLAS RPV/Long-lived Physics Group November 19 2008 Bruce Schumm, UCSC/SCIPP. Initial goal: include conversions in reconstruction. Mauro Donega, UPenn. Reconstructed radius of material-induced conversions.

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Non-Pointing Photon Work at UC Santa Cruz / SCIPP

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  1. Non-Pointing Photon Work at UC Santa Cruz / SCIPP ATLAS RPV/Long-lived Physics Group November 19 2008 Bruce Schumm, UCSC/SCIPP

  2. Initial goal: include conversions in reconstruction Mauro Donega, UPenn Reconstructed radius of material-induced conversions • Conversion radius resolution may be good enough to provide an independent constraint on GMSB parameters • Pointing accuracy of reconstructed conversion may be quite good

  3. However: conversions only available in release 14, so must migrate analysis to new release • (using 14.2.20; not ideal, but workable for conversions) • Intermediate goal: develop release 14 DPD for non-pointing photon analysis First step: migrate non-standard photon identification to release 14 via isEMMasks (applied in EVPhotonInserter)

  4. Default vs. Non-Pointing Gamma Selection (?) Mask Bit Default Criterion NP  selection 0  range YES 1 Hadronic leakage YES 4 Middle energy YES 5 Middle ratio 37 NO 6 Middle ratio 33 NO 7 Middle width NO 8 Strips energy ratio YES 9 E2,max NO 10 E2,max NO 11 1st sample width NO 12 1st sample shape NO 13 Weighted width NO 14 Isolation YES  Non-pointing photon mask is 0x4113

  5. IsEM flag for 50 GMSB events, for various photon ID requirements. Shown is a decimal representation of a bitwise record of failed photon/electron ID criteria Raw photon container Non-pointing selection Default selection

  6. Next steps for UCSC work: Need to have at least a crude validation between release 13 and 14 on signal MC  truth matching also needs to be explored (GHIT vs. proximity) Establish “non-pointing photon DPD” (private package) Add in conversions, explore efficiency and conversion radius resolution Understand if and how conversion information can enhance understanding of GMSB parameters. Plan to begin every-other-weekly phone/EVO meetings with non-pointing photon group

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