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Author : Jolyon Martin
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (271 download)
Download or read book A Measurement of the B Quark Asymmetry at the Z Zero(superscript) Resonance written by Jolyon Martin and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.:/5 (684 download)
Download or read book Measurement of the Polarized Forward-Backward Asymmetry of Z0 Bb Using a Lifetime Tag and Momentum-Weighted Track Charge written by and published by . This book was released on 2004 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 ee− --> Z° --> b{bar b}. The SLD experiment observes hadronic decays of Z° bosons produced at resonance in collisions of longitudinally polarized electrons and unpolarized positrons at the SLC. Heavy flavor decays of the Z° are identified by using the topologically reconstructed mass of B hadrons. 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−1 of ee− annihilation data with a luminosity weighted average e− polarization of 77%, and our 1993 sample of 1.8 pb−1 with a luminosity-weighted polarization of 63%, we obtain A{sub b} = 0.911 " 0.045(stat.) " 0.045(syst.).
Author : Jeff Pryce
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (596 download)
Download or read book Measurement of the B Quark Asymmetry and Cross-section from the JADE Detector written by Jeff Pryce and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the asymmetry of b quark production in e+e- annihilation at √s written by and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (873 download)
Download or read book Corrections to Quark Asymmetries at LEP. written by and published by . This book was released on 2004 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The most precise measurement of the weak mixing angle sin2 [theta]{sub eff}{sup l} at LEP is from the forward-backward asymmetry ee− 2!b{bar b} at the Z-pole. In this note the QED and electroweak radiative corrections to obtain the pole asymmetry from the measured asymmetry for b- and c-quarks have been calculated using ZFITTER, which has been amended to allow a consistent treatment of partial two-loop corrections for the b-quark final asymmetries. A total correction of [delta]A{sub FB}{sup b} = 0.0019 ± 0.0002 and [delta]A{sub FB}{sup c} = 0.0064 ± 0.0001 has been found, where the remaining theoretical uncertainty is much too small to explain the apparent discrepancy between sin2 [theta]{sub eff}{sup l} obtained from A{sub FB}{sup b} and from the left-right asymmetry at SLD.
Author :
Publisher :
ISBN 13 :
Total Pages : 132 pages
Book Rating : 4.:/5 (683 download)
Download or read book Measurement of the Polarized Forward-backward Asymmetry of B Quarks Using Momentum-weighted Track Charge at SLD. written by and published by . This book was released on 1995 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a direct measurement of the parity-violating parameter A{sub b} by analyzing the polarized forward-backward asymmetry of b quarks in ee− --> Z° --> b{bar b}. Data were taken at the Stanford Linear Accelerator Center (SLAC), with the Stanford Large Detector (SLD), which records the products of ee− interactions at a center of mass energy (square root)s = 91.2 GeV/c2 at the SLAC Linear Collider (SLC). The SLC/SLD experimental apparatus provides a unique and ideal environment for measuring electroweak asymmetries. Heavy flavor decays of the Z° were identified inclusively by taking advantage of the long lifetime of B hadrons, the small, stable SLC beam spot, and SLD's precise tracking detectors. Two analysis techniques for measuring A{sub b} are presented: a binned fit to the left-right forward-backwards asymmetry of tagged events signed with momentum-weighted track charge, and a self-calibrating maximum-likelihood technique using momentum-weighted charge from the two hemispheres in each tagged event. From our 1994-1995 sample of 3.6 pb−1, having a luminosity-weighted average e− polarization of 77.3%, and our 1993 sample of 1.8 pb−1, having a luminosity-weighted polarization of 63.1%, we obtain A{sub b} = 0.848 " 0.046(stat.) " 0.050(syst.).
Author :
Publisher :
ISBN 13 :
Total Pages : 199 pages
Book Rating : 4.:/5 (685 download)
Download or read book The Left-right Forward-backward Asymmetry for B Quarks at the SLD. written by and published by . This book was released on 1994 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: The left-right asymmetry for b quarks, A{sub b}, is precisely predicted by the Weinberg-Salam-Glashow model of particle interactions, now the standard model for high-energy particle physics. As a test of this model, A{sub b} is directly measured at the SLC Large Detector (SLD) by taking advantage of the unique polarized electron beam at the Stanford Linear Collider (SLC) and measuring the left-right forward-backward asymmetry of b quarks. To measure the asymmetry, b quarks are identified using muons of high total and transverse momenta. The result for the 1993 data sample of 37,843 hadronic Z's is A{sub b} = 0.91 " 0.19 " 0.06, where the first error is statistical and the second systematic. This result is in agreement with the standard model prediction of A{sub b} = 0.935.
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Author : TASSO Collaboration
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (354 download)
Download or read book Measurement of the Asymmetry of B Quark Production in E+e- Annihilation at [square Root of S] written by TASSO Collaboration and published by . This book was released on 1990 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Thomas Krämer
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (765 download)
Download or read book Measurement of Heavy Quark Forward-backward Asymmetries and the B-mixing Parameter Using Z-decays Recorded with the OPAL Detector at LEP written by Thomas Krämer and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : The OPAL Collaboration
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (139 download)
Download or read book MEASUREMENT of heavy quark forward-backward asymmetries and average B mixing using leptons in hadronic Z decays written by The OPAL Collaboration and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 3 pages
Book Rating : 4.:/5 (871 download)
Download or read book Left-right Forward-backward Asymmetry for C and B Quarks written by and published by . This book was released on 1995 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report reviews preliminary direct measurements of A{sub b} and A{sub c} from a sample of 100,000 hadronic Z° decays accumulated during the 1994-1995 run with a luminosity-weighted average e− polarization {vert_bar}P{sub e}{vert_bar} ≈ 77.3 ± 0.6% combined with another 50,000 events from the 1993 run with {vert_bar}P{sub e}{vert_bar} = 63.0 ± 1.1%. The description of SLD detector components can be found in references of the individual analysis papers. All asymmetry measurement results described in this paper apply cos[theta]-dependent QCD corrections.
