Heavy quark production at SLC and LEP

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Experiments at SLC and LEP have made preliminary measurements of the relative partial widths of the c and b quarks. Using D* tagging, DELPHI has found R{sub c}{bar c}{triple bond}/{Gamma}{sub c}{bar c}/{Gamma}{sub hadr.} = 0.162 {plus minus} 0.032 {plus minus} 0.031, in good agreement with the Standard Model value of 0.171. ALEPH has used semileptonic decays of charm to obtain 0.148 {plus minus} 0.044 {sub {minus}0.038}{sup +0.045}. Three experiments have used semileptonic {Beta} decays to measurement R{sub b}{bar b}: R{sub b}{bar b} = 0.23 {plus minus} 0.10 (Mark II), 0.218 {plus minus} 0.010 {plus minus} 0.021 (L3), and 0.220 {plus ... continued below

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Pages: (21 p)

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Hearty, C. June 1, 1990.

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Experiments at SLC and LEP have made preliminary measurements of the relative partial widths of the c and b quarks. Using D* tagging, DELPHI has found R{sub c}{bar c}{triple bond}/{Gamma}{sub c}{bar c}/{Gamma}{sub hadr.} = 0.162 {plus minus} 0.032 {plus minus} 0.031, in good agreement with the Standard Model value of 0.171. ALEPH has used semileptonic decays of charm to obtain 0.148 {plus minus} 0.044 {sub {minus}0.038}{sup +0.045}. Three experiments have used semileptonic {Beta} decays to measurement R{sub b}{bar b}: R{sub b}{bar b} = 0.23 {plus minus} 0.10 (Mark II), 0.218 {plus minus} 0.010 {plus minus} 0.021 (L3), and 0.220 {plus minus} 0.016 {plus minus} 0.024 (ALEPH). All agree well with the expected value of 0.217. The uncertainty in branching ratios of c and b hadrons is the largest systematic error in all of the results. Future LEP measurements of the branching ratios may reduce the errors. R{sub b}{bar b} will also be measured with different, and possibly lower, systematic errors by Mark II using impact parameter tagging.

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Pages: (21 p)

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NTIS, PC A03/MF A01; OSTI; INIS; GPO Dep.

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  • 10. international conference on physics in collision, Durham, NC (USA), 21-23 Jun 1990

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  • Other: DE91000225
  • Report No.: LBL-29466
  • Report No.: CONF-9006268--2
  • Grant Number: AC03-76SF00098
  • Office of Scientific & Technical Information Report Number: 6483096
  • Archival Resource Key: ark:/67531/metadc1204206

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  • June 1, 1990

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  • July 5, 2018, 11:11 p.m.

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  • Oct. 30, 2018, 1:10 p.m.

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Hearty, C. Heavy quark production at SLC and LEP, article, June 1, 1990; California. (digital.library.unt.edu/ark:/67531/metadc1204206/: accessed November 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.