Effects of shower spreading on Z degrees yields J J mass resolution

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This study concerns the effects of hadronic shower spreading and lateral calorimeter segmentation on the jet-jet mass resolution, for high Pt (Pt>500 GeV) hadronic Z{sup 0} decays. In a previous study, we examined the effects of lateral calorimeter segmentation on detection and measurement of high Pt Z{sup 0} {yields} jet-jet, for an ideal calorimeter with no lateral shower spreading. Other recent studies have also examined the dependence of Z{sup 0} mass resolution on calorimeter segmentation, using more realistic models of shower spreading. The studies reported so far have assumed a common calorimeter segmentation for the EM and HAD compartments, and ... continued below

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Pages: (8 p)

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Wicklund, A.B. September 4, 1991.

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This study concerns the effects of hadronic shower spreading and lateral calorimeter segmentation on the jet-jet mass resolution, for high Pt (Pt>500 GeV) hadronic Z{sup 0} decays. In a previous study, we examined the effects of lateral calorimeter segmentation on detection and measurement of high Pt Z{sup 0} {yields} jet-jet, for an ideal calorimeter with no lateral shower spreading. Other recent studies have also examined the dependence of Z{sup 0} mass resolution on calorimeter segmentation, using more realistic models of shower spreading. The studies reported so far have assumed a common calorimeter segmentation for the EM and HAD compartments, and have concluded that (.05{times}.05) segmentation is a desirable optimization point, given the basic limitations imposed by calorimeter energy resolution, shower size, underlying event, etc. In the present study, we consider the case that HAD is segmented more coarsely, specifically (.1{times}.1) instead of (.05{times}.05), and we assume that the EM segmentation is fixed at (.05{times}.05), as driven by electron identification requirements. This hybrid segmentation'' would represent a significant cost saving for SDC. We might expect that the effects of coarser HAD segmentation on the jet- jet mass resolution would be minimal for two reasons. First, roughly half the jet energy is deposited in the EM compartment anyway, and benefits from the (.05{times}.05) EM cell size. Second, the lateral hadron shower size increases with depth, so that the shower spreading is larger on average in the HAD calorimeter alone, than it is in EM + HAD combined. Thus we might expect coarser segmentation to be less important deeper in the calorimeter.

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Pages: (8 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • Other: DE92000296
  • Report No.: ANL-HEP-TR-91-78
  • Report No.: SDC--91-00083
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/5246576 | External Link
  • Office of Scientific & Technical Information Report Number: 5246576
  • Archival Resource Key: ark:/67531/metadc1065922

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  • September 4, 1991

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • April 17, 2018, 3:21 p.m.

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Wicklund, A.B. Effects of shower spreading on Z degrees yields J J mass resolution, report, September 4, 1991; Illinois. (digital.library.unt.edu/ark:/67531/metadc1065922/: accessed May 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.