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Measurement Of The Forward Backward Asymmetry Of Charm Quark Production In E E Annihilations At S
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Book Synopsis Measurement of the Forward-backward Asymmetry of Charm Quark Production in E + E - Annihilations at √s by : A. Okamoto
Download or read book Measurement of the Forward-backward Asymmetry of Charm Quark Production in E + E - Annihilations at √s written by A. Okamoto and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of Forward-backward Charge Asymmetry in the Process of B-quark Production in E + E - Annihilation Around √s by : M. Shirakata
Download or read book Measurement of Forward-backward Charge Asymmetry in the Process of B-quark Production in E + E - Annihilation Around √s written by M. Shirakata and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis MEASUREMENT OF FORWARD-BACKWARD CHARGE ASYMMETRY IN THE PROCESS OF B-QUARK PRODUCTION IN E+E- ANNIHILATION AROUND SQUARE ROOT OF S by : M. Shirakata
Download or read book MEASUREMENT OF FORWARD-BACKWARD CHARGE ASYMMETRY IN THE PROCESS OF B-QUARK PRODUCTION IN E+E- ANNIHILATION AROUND SQUARE ROOT OF S written by M. Shirakata and published by . This book was released on 1991 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis First Measurement of the Forward-backward Asymmetry in Bottom-quark Pair Production at High Mass by :
Download or read book First Measurement of the Forward-backward Asymmetry in Bottom-quark Pair Production at High Mass written by and published by . This book was released on 2015 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Measurement of the Forward-backward Charge Asymmetry in Electron-positron Annihilation Into a Quark-antiquark Pair by : David Donald Stuart
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:
Book Synopsis Measurement of the Forward-Backward Asymmetry in Low-Mass Bottom-Quark Pairs Produced in Proton-Antiproton Collisions by :
Download or read book Measurement of the Forward-Backward Asymmetry in Low-Mass Bottom-Quark Pairs Produced in Proton-Antiproton Collisions written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report a measurement of the forward-backward asymmetry, $A_{FB}$, in $b\bar{b}$ pairs produced in proton-antiproton collisions and identified by muons from semileptonic $b$-hadron decays. The event sample was collected at a center-of-mass energy of $\sqrt{s}=1.96$ TeV with the CDF II detector and corresponds to 6.9 fb$^{-1}$ of integrated luminosity. We obtain an integrated asymmetry of $A_{FB}(b\bar{b})=(1.2 \pm 0.7)$\% at the particle level for $b$-quark pairs with invariant mass, $m_{b\bar{b}}$, down to $40$ GeV/$c^2$ and measure the dependence of $A_{FB}(b\bar{b})$ on $m_{b\bar{b}}$. The results are compatible with expectations from the standard model.
Book Synopsis A Measurement of the B-quark Forward-backward Charge Asymmetry in Electron-positron Annihilation at a Center-of-mass Energy of 58 GeV by : Timothy Lester Thomas
Download or read book A Measurement of the B-quark Forward-backward Charge Asymmetry in Electron-positron Annihilation at a Center-of-mass Energy of 58 GeV written by Timothy Lester Thomas and published by . This book was released on 1995 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Measurement of the Left-right, Forward-backward Asymmetry for Charm Quarks Using D{sup *+} and D Mesons by :
Download or read book A Measurement of the Left-right, Forward-backward Asymmetry for Charm Quarks Using D{sup *+} and D Mesons written by and published by . This book was released on 1994 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Longitudinal polarization of the SLC e− beam allows a direct measurement of the left-right, forward-backward asymmetry of c-quarks to be made with the SLD. Events from Z° --> c{bar c} are tagged using fully and partially reconstructed decays of D{sup *+} mesons, and fully reconstructed decays of D mesons. The authors measure A{sub c} = 0.77 " 0.22(stat.) " 0.10(syst.).
Book Synopsis Measurements of B-quark Forward-backward Charge Asymmetry and Axial-vector Coupling Using Inclusive Muons in E +e - Annihilation at √s by :
Download or read book Measurements of B-quark Forward-backward Charge Asymmetry and Axial-vector Coupling Using Inclusive Muons in E +e - Annihilation at √s written by and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of the Forward-backward Asymmetry in Top Quark-antiquark Production in Ppbar Collisions Using the Lepton+jets Channel by :
Download or read book Measurement of the Forward-backward Asymmetry in Top Quark-antiquark Production in Ppbar Collisions Using the Lepton+jets Channel written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Measurement of the Left-hand, Forward-backward Asymmetry for Charm Quarks Using Dsup *+ and Dsup + Mesons by :
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:
Book Synopsis A Preliminary Direct Measurement of the Parity Violating Coupling of the Z° to Strange Quarks, A{sub S} by :
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 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a preliminary direct measurement of the parity violating coupling of the Z° to strange quarks, A{sub s}, derived from a sample of approximately 300,000 hadronic decays of Z° produced with a polarized electron beam and recorded by the SLD experiment at SLAC between 1993 and 1997. 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 strange 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 strange quark. To reduce the model dependence of the measurement, the background from primary up and down events is measured from the data, as is the analyzing power of the method for primary strange events. We measure: A{sub s} = 0.82 ± 0.10(stat.) {+-} 0.08(syst.)(preliminary).
Book Synopsis 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 by : David D. Stuart
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:
Book Synopsis Top Quark Pair Production Cross Section and Forward-Backward Asymmetry at the Tevatron by :
Download or read book Top Quark Pair Production Cross Section and Forward-Backward Asymmetry at the Tevatron written by and published by . This book was released on 2008 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present recent results on top quark pair production cross section and forward-backward asymmetry at the Tevatron. Three new cross section measurements from CDF and one new measurement from DO are presented that utilize the full dataset available. A new DO top cross section combination gives a ttbar production cross section of sigma ttbar = 7.83 + 0.46-0.45 (stat) + 0.64-0.53 (syst) +-0.48 (lumi). The new CDF cross section combination for ttbar production is found to be 7.0 +- 0.3 (stat) +- 0.4 (syst) +- 0.4 (lumi) pb giving a total uncertainty of 9%, very close to the that of the current best theoretical predictions. It is important to measure the top cross section in as many different channels as possible and investigate their compatibility. This is useful as new physics might show up differently in the different channels. Thus any significant discrepancy could be a sign of new physics. Three new measurements of the forward-backward asymmetry are also presented. The two CDF measurements unfold the observed asymmetry back to parton level in order to directly compare the values obtained with theoretical predictions. The DO measurement is not unfolded and therefore does not depend on the specific method used for unfolding.
Book Synopsis Measurement of the Polarized Forward-backward Asymmetry of Z° --] B{bar B} Using a Lifetime Tag and Momentum-weighted Track Charge by :
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.).
Book Synopsis Evidence for a Mass Dependent Forward-Backward Asymmetry in Top Quark Pair Production by :
Download or read book Evidence for a Mass Dependent Forward-Backward Asymmetry in Top Quark Pair Production written by and published by . This book was released on 2011 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a new measurement of the inclusive forward-backward t{bar t} production asymmetry and its rapidity and mass dependence. The measurements are performed with data corresponding to an integrated luminosity of 5.3 fb−1 of p{bar p} collisions at √s = 1.96 TeV, recorded with the CDF II Detector at the Fermilab Tevatron. Significant inclusive asymmetries are observed in both the laboratory frame and the t{bar t} rest frame, and in both cases are found to be consistent with CP conservation under interchange of t and {bar t}. In the t{bar t} rest frame, the asymmetry is observed to increase with the t{bar t} rapidity difference, [Delta]y, and with the invariant mass M{sub t{bar t}} of the t{bar t} system. Fully corrected parton-level asymmetries are derived in two regions of each variable, and the asymmetry is found to be most significant at large [Delta]y and M{sub t{bar t}}. For M{sub t{bar t}} ≥ 450 GeV/c2, the parton-level asymmetry in the t{bar t} rest frame is A{sup t{bar t}} = 0.475 ± 0.114 compared to a next-to-leading order QCD prediction of 0.088 ± 0.013.
Book Synopsis Forward-backward Asymmetry in Top Quark-antiquark Production by :
Download or read book Forward-backward Asymmetry in Top Quark-antiquark Production written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a measurement of forward-backward asymmetry in top quark-antiquark production in proton-antiproton collisions in the final state containing a lepton and at least four jets. Using a dataset corresponding to an integrated luminosity of 5.4 fb−1, collected by the D0 experiment at the Fermilab Tevatron Collider, we measure the t{bar t} forward-backward asymmetry to be (9.2 ± 3.7)% at the reconstruction level. When corrected for detector acceptance and resolution, the asymmetry is found to be (19.6 ± 6.5)%. We also measure a corrected asymmetry based on the lepton from a top quark decay, found to be (15.2 ± 4.0)%. The results are compared to predictions based on the next-to-leading-order QCD generator mc@nlo. The sensitivity of the measured and predicted asymmetries to the modeling of gluon radiation is discussed.
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