Background neutral veto: Background reduction in eta(c) --> gamma-gamma

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Several upgrades of the E760 detector have been discussed at various stages. One of these considered the possibility of covering with a photon detector the backward region (i.e. lab. poar angle {theta}{sub lab} > 70{sup o}). In this memo the author limited the study to the effect of an extensive coverage in the backward region on the {gamma}{gamma} background at the {eta}{sub c}. This is a rather important channel. In effect at this time and as far as the author knows, they don't have a clear signal and the Signal/Background ratio is poor. (Signal/Background {approx_equal} 1. {divided_by} 1.5 are the ... continued below

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5 pages

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Marchetto, F. & /INFN, Turin /Turin U. June 1, 1992.

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Description

Several upgrades of the E760 detector have been discussed at various stages. One of these considered the possibility of covering with a photon detector the backward region (i.e. lab. poar angle {theta}{sub lab} > 70{sup o}). In this memo the author limited the study to the effect of an extensive coverage in the backward region on the {gamma}{gamma} background at the {eta}{sub c}. This is a rather important channel. In effect at this time and as far as the author knows, they don't have a clear signal and the Signal/Background ratio is poor. (Signal/Background {approx_equal} 1. {divided_by} 1.5 are the values so far obtained from different analyses). Nevertheless the {gamma}{gamma} final state remains the ''strong channel'' for the {eta}{sub c} detection. The author considered as background sources the {pi}{sup 0}{pi}{sup 0} and {pi}{sup 0}{gamma} final states and the author required |cos{theta}*| < 0.25. Events p{bar p} {yields} {pi}{sup 0}{pi}{sup 0} and {pi}{sup 0}{gamma} were Monte Carlo generated at E{sub CM} = 2.985 GeV with the angular distribution as measured by E760 [1].

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5 pages

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  • Report No.: FERMILAB-TM-2333-E
  • Grant Number: AC02-76CH03000
  • DOI: 10.2172/875508 | External Link
  • Office of Scientific & Technical Information Report Number: 875508
  • Archival Resource Key: ark:/67531/metadc873600

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  • June 1, 1992

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 2, 2016, 8:31 p.m.

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Marchetto, F. & /INFN, Turin /Turin U. Background neutral veto: Background reduction in eta(c) --> gamma-gamma, report, June 1, 1992; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc873600/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.