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Slides for phiee 1) ghosting

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

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Slides for phiee 1) ghosting

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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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