MEASUREMENT OF FORWARD-BACKWARD CHARGE ASYMMETRY IN THE PROCESS OF B-QUARK PRODUCTION IN E+E- ANNIHILATION AROUND SQUARE ROOT OF S PDF Download
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Author: M. Shirakata
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Languages : en
Pages : 0
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Author: M. Shirakata
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Languages : en
Pages : 0
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Author: M. Shirakata
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Languages : en
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Author: Timothy Lester Thomas
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Languages : en
Pages : 548
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Languages : en
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Author: David Donald Stuart
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Category :
Languages : en
Pages : 236
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![Measurement of the Asymmetry of B Quark Production in E+e- Annihilation at [square Root of S] PDF](https://books.google.com/books/content/images/frontcover/kLvWHAAACAAJ?fife=w80-h100)
Author: TASSO Collaboration
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Languages : en
Pages : 14
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Category :
Languages : en
Pages : 132
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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: David D. Stuart
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Languages : en
Pages : 0
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Languages : de
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Languages : en
Pages : 11
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We measure the particle-level forward-backward production asymmetry in $\mathrm{b\bar{b}}$ pairs with masses (m$\mathrm{b\bar{b}}$) larger than 150 GeV/c2, using events with hadronic jets and employing jet charge to distinguish b from $\bar{b}$. The measurement uses 9.5 fb-1 of $\mathrm{p\bar{p}}$ collisions at a center-of-mass energy of 1.96 TeV recorded by the CDF II detector. The asymmetry as a function of m$\mathrm{b\bar{b}}$ is consistent with zero, as well as with the predictions of the standard model. The measurement disfavors a simple model including an axigluon with a mass of 200 GeV/c2, whereas a model containing a heavier 345 GeV/c2 axigluon is not excluded.
