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Ghosting in Electron-Positron Invariant Mass Spectra Analysis

This presentation discusses ghosting effects observed in electron-positron invariant mass spectra. It compares mixed electron-pair spectra and addresses normalization using sidebands in the phi region. Key findings include normalization factor comparisons between sidebands and standard pairs, highlighting ghost cut methodologies and their impact on experimental results. The procedure involves analyzing same-event pairs by applying cuts based on delta values and ring sharing. Insights from prior studies are integrated, and further exploratory work is proposed to refine the analysis of electron events.

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Ghosting in Electron-Positron Invariant Mass Spectra Analysis

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  1. Slides for phiee1) ghosting Richard Seto dec 18, 2003

  2. Ghosting • What I show in the next 2 pages is the e- e- invariant mass spectra compared to the mixed e- e- • Normalization is done on the “sidebands of the phi (.85-.95) and (1.1-1.2) • Also shown is the normalization factor from the sidebands compared to the standard

  3. (--) pairs compared to mixed (--) Add ring sharing cut Loose electron cuts ghosts Same as above around omega phi region 2sqrt(++--)=0.485995 sideband=0.294575 2sqrt(++--)=0.344579 sideband=0.295826

  4. Same for ++,-- W or w/o line cut Ring sharing helps Normalizations approach each other Need a ghost cut Good electron Add Tight electron cuts Add qual=61,63 Loose electron cuts 2sqrt(++--)=0.33022 sideband=0.291444 2sqrt(++--)=0.342359 sideband=0.30297

  5. Procedure • Look at ++,-- same event pairs. • Kill randomly one of a pair when that pair • Delta zed<? • Delta phi0=? • Shares ring? • Then go and make +- combinations and mixed events • Yuji had some numbers for the above. Also the weitzman guys had some much larger numbers. (e.g. dzed>1 cm) • This is my guess. I need to try it. It will at least clean up the ++,-- stuff

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