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Download or read book A Measurement of the Left-hand, Forward-backward Asymmetry for Charm Quarks Using Dsup *+ and Dsup + Mesons written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download Measurement of the Polarized Forward-backward Asymmetry of Z° --] B{bar B} Using a Lifetime Tag and Momentum-weighted Track Charge PDF Online Free](https://books.google.com/books/content/images/frontcover/LUUKkAEACAAJ?fife=w200-h370)
Author :
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ISBN 13 :
Total Pages : 6 pages
Book Rating : 4.:/5 (683 download)
Download or read book Measurement of the Polarized Forward-backward Asymmetry of Z° --] B{bar B} Using a Lifetime Tag and Momentum-weighted Track Charge written by and published by . This book was released on 1995 with total page 6 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{sup o} --> 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−1 of ee− annihilation data with a luminosity-weighted average e− polarization of 77.3%, and our 1993 sample of 1.8 pb−1 with a luminosity-weighted polarization of 63.1%, we obtain A{sub b}(preliminary) = 0.843 " 0.046(stat.) " 0.051(syst.).
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ISBN 13 :
Total Pages : 936 pages
Book Rating : 4.:/5 (3 download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1986 with total page 936 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Thomas Robert Junk
Publisher :
ISBN 13 :
Total Pages : 528 pages
Book Rating : 4.:/5 (798 download)
Download or read book Measurement of the Polarized Forward-backward Asymmetry of Β Quarks Using Momentum-weighted Track Charge at SLD written by Thomas Robert Junk and published by . This book was released on 1995 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 140 pages
Book Rating : 4.:/5 (873 download)
Download or read book Measurement of the Inclusive Forward-Backward ${\textbf{\textrm{t}}}\bar{\textrm{\textbf{t}}}$ Production Asymmetry and Its Rapidity Dependence $\textrm{\textbf{dA}}_{\textrm{\textbf{fb}}} written by and published by . This book was released on 2010 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: Early measurements of a large forward-background asymmetry at the CDF and D0 experiments at Fermilab have generated much recent interest, but were hampered by large uncertainties. We present here a new measurement of the parton level forward-backward asymmetry of pair-produced top quarks, using a high-statistics sample with much improved precision. We study the rapidity, y{sub top}, of the top quark production angle with respect to the incoming parton momentum in both the lab and t{bar t} rest frames. We find the parton-level forward-backward asymmetries to be A{sub fb}{sup p{bar p}} = 0.150 ± 0.050{sup stat} ± 0.024{sup syst} A{sub fb}{sup t{bar t}} = 0.158 ± 0.072{sup stat} ± 0.024{sup syst}. These results should be compared with the small p{bar p} frame charge asymmetry expected in QCD at NLO, A{sub fb} = 0.050 ± 0.015. Additionally, we introduce a measurement of the A{sub fb} rapidity dependence dA{sub fb}/d([Delta]y). We find this to be A{sub fb}{sup t{bar t}}).
Author : David Donald Stuart
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ISBN 13 :
Total Pages : 236 pages
Book Rating : 4.:/5 (48 download)
Download or read book Measurement of the Forward-backward Charge Asymmetry in Electron-positron Annihilation Into a Quark-antiquark Pair written by David Donald Stuart and published by . This book was released on 1992 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download Measurement of the Polarized Forward-backward Asymmetry of [beta] Quarks Using Momentum-weighted Track Charge at SLD PDF Online Free](https://books.google.com/books/content/images/frontcover/MgWTPAAACAAJ?fife=w200-h370)
Author : Thomas Robert Junk
Publisher :
ISBN 13 :
Total Pages : 528 pages
Book Rating : 4.:/5 (123 download)
Download or read book Measurement of the Polarized Forward-backward Asymmetry of [beta] Quarks Using Momentum-weighted Track Charge at SLD written by Thomas Robert Junk and published by . This book was released on 1995 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 23 pages
Book Rating : 4.:/5 (871 download)
Download or read book A Preliminary Direct Measurement of the Parity-Violating Coupling of the Z° to Strange Quarks, A{sub S} written by and published by . This book was released on 1999 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present an updated direct measurement of the parity-violating coupling of the Z° to strange quarks, A{sub s}, derived from the full SLD data sample of approximately 550,000 hadronic decays of Z° bosons produced with a polarized electron beam and recorded by the SLD experiment at SLAC between 1993 and 1998. Z° → s{bar s} events are tagged by the presence in each event hemisphere of a high-momentum K{sup ±}, K{sub s} or [Lambda]°/{bar {Lambda}}° identified using the Cherenkov Ring Imaging Detector and/or a mass tag. The CCD vertex detector is used to suppress the background from heavy-flavor events. The strangeness of the tagged particle is used to sign the event thrust axis in the direction of the initial s quark. The coupling A{sub s} is obtained directly from a measurement of the left-right-forward-backward production asymmetry in polar angle of the tagged s quark. The background from u{bar u} and d{bar d} events is measured from the data, as is the analyzing power of the method for s{bar s} events. We measure: A{sub s} = 0.85 ± 0.06(stat.) {+-} 0.07(syst.)(preliminary).
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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.
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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.).
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ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (873 download)
Download or read book Measurement of $\sin^2\theta_{\rm Eff}^{\ell}$ and $Z$-light Quark Couplings Using the Forward-backward Charge Asymmetry in $p\bar{p} \to Z/\gamma^{*} \to E^{+}e^{-}$ Events with ${\cal L} written by and published by . This book was released on 2011 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: We measure the mass dependence of the forward-backward charge asymmetry in 157,553 p{bar p} → Z/[gamma]* → e+e− interactions, corresponding to 5.0 fb−1 of integrated luminosity collected by the D0 experiment at the Fermilab Tevatron Collider at √s = 1.96 TeV. The effective weak mixing angle ([theta]{sub eff}{sup {ell}}) from this process involving predominantly the first generation of quarks is extracted as sin2 [theta]{sub eff}{sup {ell}} = 0.2309 ± 0.0008 (stat.) ± 0.0006 (syst.). We also present the most precise direct measurement of the vector and axial-vector couplings of u and d quarks to the Z boson.
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ISBN 13 :
Total Pages : 716 pages
Book Rating : 4.3/5 (243 download)
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1995 with total page 716 pages. Available in PDF, EPUB and Kindle. Book excerpt:
![Download Measurement of the Drell-Yan Differential Cross Section and Forward-backward Asymmetry in Pp̄ [right Arrow] E E− Events Using the DØ Detector PDF Online Free](https://books.google.com/books/content/images/frontcover/BbsRm347eREC?fife=w200-h370)
Author : Raymond Gelhaus
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ISBN 13 :
Total Pages : 394 pages
Book Rating : 4.3/5 (121 download)
Download or read book Measurement of the Drell-Yan Differential Cross Section and Forward-backward Asymmetry in Pp̄ [right Arrow] E E− Events Using the DØ Detector written by Raymond Gelhaus and published by . This book was released on 2005 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of Sin2 ?leff and Z-light Quark Couplings Using the Forward-backward Charge Asymmetry in Pp -> Z/gamma* -> E+e- Events with L written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We measure the mass dependence of the forward-backward charge asymmetry in 157,553 pp = Z/?* = e+e- interactions, corresponding to 5.0 fb-1 of integrated luminosity collected by the D0 experiment at the Fermilab Tevatron Collider at √s = 1.96 TeV. The effective weak mixing angle (?leff) from this process involving predominantly the first generation of quarks is extracted as sin2 ?leff = 0.2309 ± 0.0008 (stat.) ± 0.0006 (syst.). We also present the most precise direct measurement of the vector and axial-vector couplings of u and d quarks to the Z boson.
![Download Measurement of the Drell-Yan Differential Cross Section and Forward - Backward Asymmetry in Proton Anti-proton --] E+ E- Events Using the D0 Detector PDF Online Free](https://books.google.com/books/content/images/frontcover/BoOwDAEACAAJ?fife=w200-h370)
Author : Raymond Gelhaus
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ISBN 13 :
Total Pages : 193 pages
Book Rating : 4.:/5 (316 download)
Download or read book Measurement of the Drell-Yan Differential Cross Section and Forward - Backward Asymmetry in Proton Anti-proton --] E+ E- Events Using the D0 Detector written by Raymond Gelhaus and published by . This book was released on 2005 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present measurements of the inclusive Drell-Yan e{sup +}e{sup -} differential cross section (d{sigma}/dM{sub e{sup +}e{sup -}}) and forward-backward asymmetry (A{sub FB}) as a function of the dielectron invariant mass over the range 70-400 GeV/c{sup 2}. The data sample consists of 177.3 pb{sup -1} of p{bar p} collisions at {radical}s = 1.96 TeV collected by the D0 detector. The results are consistent with the predictions of the standard model.
Author : Julia Ann Davies
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ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (596 download)
Download or read book A Measurement of the Cross-section and Forward-backward Asymmetry of the written by Julia Ann Davies and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : David D. Stuart
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ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (14 download)
Download or read book Measurement of the forward-backward charge asymmetry in electron-positron annihilation into a quark-antiquark pair a test of electroweak interference by David Donald Stuart written by David D. Stuart and published by . This book was released on 1992 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
