Recent results from Mark II at SPEAR and PEP

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Three results are presented: (1) The semi-leptonic branching ratio of the ..lambda../sub c/ has been measured at SPEAR to be B(..lambda../sub c//sup +/ ..-->.. e/sup +/X) = (4.5 +- 1.7)%. (2) Properties of tau-pair production have been measured at PEP at square root S = 29 GeV: sigma/sup tau tau//sigma/sup QED/ = 0.97 +- 0.05 +- 0.06; the forward-backward asymmetry is A/sub tau tau/ = (-3.5 +- 5.0)%; inclusive branching ratios are B(tau ..-->.. 1 Prong) = (86 +- 4)%, B(tau ..-->.. 3 Prongs) = (14 +- 4)%, B(tau ..-->.. 5 Prongs) < 0.6% (95% C.L.). (3) A search has ... continued below

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Pages: 14

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Strait, J. April 1, 1982.

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Three results are presented: (1) The semi-leptonic branching ratio of the ..lambda../sub c/ has been measured at SPEAR to be B(..lambda../sub c//sup +/ ..-->.. e/sup +/X) = (4.5 +- 1.7)%. (2) Properties of tau-pair production have been measured at PEP at square root S = 29 GeV: sigma/sup tau tau//sigma/sup QED/ = 0.97 +- 0.05 +- 0.06; the forward-backward asymmetry is A/sub tau tau/ = (-3.5 +- 5.0)%; inclusive branching ratios are B(tau ..-->.. 1 Prong) = (86 +- 4)%, B(tau ..-->.. 3 Prongs) = (14 +- 4)%, B(tau ..-->.. 5 Prongs) < 0.6% (95% C.L.). (3) A search has been performed for the pair production of charged, point-like, spin 0 particles. The existence of such particles can be ruled out at a 90% confidence level for 3 approx. < M approx. < 10 GeV/c/sup 2/ and branching ratio into hadrons approx. < 90%.

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Pages: 14

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NTIS, PC A02/MF A01.

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  • 17. Recontre de Moriond meeting, Les Arcs, Savoie, France, 14 Mar 1982

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  • Other: DE82016169
  • Report No.: SLAC-PUB-2914
  • Report No.: LBL-14392
  • Report No.: CONF-820371-3
  • Grant Number: AC03-76SF00615
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 5165926
  • Archival Resource Key: ark:/67531/metadc1060849

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Office of Scientific & Technical Information Technical Reports

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  • April 1, 1982

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  • Jan. 22, 2018, 7:23 a.m.

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  • Jan. 26, 2018, 6:09 p.m.

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Strait, J. Recent results from Mark II at SPEAR and PEP, article, April 1, 1982; United States. (digital.library.unt.edu/ark:/67531/metadc1060849/: accessed December 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.