Measurement of the polarized forward-backward asymmetry of Z{sup 0} {yields} b{bar b} using a lifetime tag and momentum-weighted track charge

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We present a direct measurement of the parity-violating parameter A{sub b} by analyzing the left-right forward-backward asymmetry of b quarks in e{sup +}e{sup {minus}} {yields} Z{sup o} {yields} b{bar b}. The SLD experiment observes hadronic decays of Z{sup o} bosons produced at resonance in collisions of longitudinally polarized electrons and unpolarized positrons at the SLC. Heavy flavor decays of the Z{sup o} are identified by taking advantage of the long lifetime of B hadrons, the small, stable SLC beam spot, and precise tracking from SLD. The asymmetry A{sub b} is measured with a self-calibrating technique employing momentum-weighted track charge from ... continued below

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6 p.

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Collaboration, The SLD August 1, 1995.

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Description

We present a direct measurement of the parity-violating parameter A{sub b} by analyzing the left-right forward-backward asymmetry of b quarks in e{sup +}e{sup {minus}} {yields} Z{sup o} {yields} b{bar b}. The SLD experiment observes hadronic decays of Z{sup o} bosons produced at resonance in collisions of longitudinally polarized electrons and unpolarized positrons at the SLC. Heavy flavor decays of the Z{sup o} are identified by taking advantage of the long lifetime of B hadrons, the small, stable SLC beam spot, and precise tracking from SLD. The asymmetry A{sub b} is measured with a self-calibrating technique employing momentum-weighted track charge from both hemispheres in the tagged events. From our 1994--1995 sample of 3.6 pb{sup {minus}1} of e{sup +}e{sup {minus}} annihilation data with a luminosity-weighted average e{sup {minus}} polarization of 77.3%, and our 1993 sample of 1.8 pb{sup {minus}1} with a luminosity-weighted polarization of 63.1%, we obtain A{sub b}(preliminary) = 0.843 {plus_minus} 0.046(stat.) {plus_minus} 0.051(syst.).

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6 p.

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INIS; OSTI as DE96002433

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  • HEP 95: international Europhysics conference on high-energy physics, Brussels (Belgium), 27 Jul - 2 Aug 1995

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  • Other: DE96002433
  • Report No.: SLAC-PUB--95-6979
  • Report No.: CONF-950705--34
  • Grant Number: AC03-76SF00515
  • Office of Scientific & Technical Information Report Number: 148612
  • Archival Resource Key: ark:/67531/metadc623091

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  • August 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • Feb. 5, 2016, 7:04 p.m.

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Collaboration, The SLD. Measurement of the polarized forward-backward asymmetry of Z{sup 0} {yields} b{bar b} using a lifetime tag and momentum-weighted track charge, article, August 1, 1995; Menlo Park, California. (digital.library.unt.edu/ark:/67531/metadc623091/: accessed October 21, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.