Measurement of the Forward-Backward Charge Asymmetry($A_{FB}$) Using $p\bar{p}\rightarrow Z/\gamma*\rightarrow E^+e^-$ Events in $\sqrt{S}
Measurement of the Forward-Backward Charge Asymmetry($A_{FB}$) Using $p\bar{p}\rightarrow Z/\gamma*\rightarrow E^+e^-$ Events in $\sqrt{S}

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Published: 2010

Total Pages: 266

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This dissertation describes a measurement of the forward-backward asymmetry(A{sub FB}) in p{bar p} → Z/[gamma]* → ee events using 5.0 fb−1 data collected by the D0 detector at the Fermilab Tevatron. The AFB is measured as a function of the invariant mass of the electron-positron pair. Along with obtaining normalized differential cross section 1/[sigma] x d[sigma]/dM and Z to light quark couplings, we measured the Standard Model(SM) fundamental parameter, the effective weak mixing angle sin2 [theta]{sub eff}{sup lept}, with an unprecedented precise in light quark sector, namely the single D0 measurement has surpassed the LEP combination of four experiment results of inclusive hadronic charge asymmetry.

Measurement of the Forward-backward Charge Asymmetry and Extraction of $sin^2Theta^{eff}_W$ in $p\bar{p} \to Z/\gamma^{*}+X \to E^+e^-+X$ Events Produced at $\sqrt{s}
Measurement of the Forward-backward Charge Asymmetry and Extraction of $sin^2Theta^{eff}_W$ in $p\bar{p} \to Z/\gamma^{*}+X \to E^+e^-+X$ Events Produced at $\sqrt{s}

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Published: 2008

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We present a measurement of the forward-backward charge asymmetry (A{sub FB}) in p{bar p} 2!Z/[gamma]* + X 2!ee− + X events at a center-of-mass energy of 1.96 TeV using 1.1 fb−1 of data collected with the D0 detector at the Fermilab Tevatron collider. A{sub FB} is measured as a function of the invariant mass of the electron-positron pair, and found to be consistent with the standard model prediction. We use the A{sub FB} measurement to extract the effective weak mixing angle sin2 [theta]{sub W}{sup eff} = 0.2327 ± 0.0018 (stat.) ± 0.0006 (syst.).

Measurement of the Polarized Forward-backward Asymmetry of Z° --] B{bar B} Using a Lifetime Tag and Momentum-weighted Track Charge
Measurement of the Polarized Forward-backward Asymmetry of Z° --] B{bar B} Using a Lifetime Tag and Momentum-weighted Track Charge

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Published: 1995

Total Pages: 6

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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 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.).

Measurement of the Forward-Backward Asymmetry in $\gamma/Z$ Boson to Dilepton Events in Compact Muon Solenoid at a Center-of-mass Energy of 7 TeV.
Measurement of the Forward-Backward Asymmetry in $\gamma/Z$ Boson to Dilepton Events in Compact Muon Solenoid at a Center-of-mass Energy of 7 TeV.

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Published: 2011

Total Pages: 89

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The forward-backward asymmetry parameter ($A_{\rm FB}$) as a function of dilepton invariant mass in $Z / \gamma^* \rightarrow l^+l^-$ ($l$=$e$ or $\mu$) at $\sqrt{s}$=7 TeV is measured using 2.2 fb$^{-1}$ of $pp$ collision data in 2011. The uncorrected (raw) $A_{\rm FB}$ and the corrected (unfolded) $A_{\rm FB}$ is performed in a wide mass range between 40 GeV/$c^{2}$ to 1000 GeV/$c^{2}$, and comparative studies and correction techniques with simulation are described in detail. We measure raw $A_{\rm FB}$ for the first time in a large rapidity range of 3 $>

Measurement of the Forward-backward Asymmetry in ?b0 and $\bar{{u039B}}_b0̂$ Baryon Production in $p\bar{p}$ Collisions at $\sqrt{s}$
Measurement of the Forward-backward Asymmetry in ?b0 and $\bar{{u039B}}_b0̂$ Baryon Production in $p\bar{p}$ Collisions at $\sqrt{s}$

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Published: 2015

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We measure the forward-backward asymmetry in the production of ?0b and ?¯0b baryons as a function of rapidity in pp¯ collisions at √s = 1.96 TeV using 10.4 fb-1 of data collected with the D0 detector at the Fermilab Tevatron collider. The asymmetry is determined by the preference of ?0b or ?¯0b particles to be produced in the direction of the beam protons or antiprotons, respectively. As a result, the measured asymmetry integrated over rapidity y in the range 0.1

Asymmetries in W^+/- and Z^0/gamma^* Production at the Tevatron
Asymmetries in W^+/- and Z^0/gamma^* Production at the Tevatron

Author: E. Halkiadakis

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Published: 2004

Total Pages: 4

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The authors describe a measurement of the charge asymmetry of electrons from W{sup {+-}} boson decays using p{bar p} {yields} W {yields} e{nu} events. They also present a measurement of the forward-backward charge asymmetry of electron-positron pairs resulting from the process p{bar p} {yields} Z{sup 0}/{gamma}* {yields} e{sup +}e{sup -}, from which they extract the Z{sup 0}-quark and Z{sup 0}-electron coupling constants and measure the sensitivity of the CDF experiment to these couplings. These analyses use integrated luminosities of 170 pb{sup -1} and 72 pb{sup -1}, respectively, of data collected by the CDF Run II detector at the Fermilab Tevatron.