Chapter 2.3 - Precision Electroweak Program

The complete Chapter 2.3 document is available here.

Figures

• Figure 2.9 - $E/p$ distribution of electrons from $W$ decays. The solid (dotted, dashed) histogram uses 8\% X$_o$ (17\% X$_o$, 30\% X$_o$) of the detector material up to the middle of the CTC.

• Figure 2.10 - The $| \eta_{\rm det} |$ distributions of plug $W$ electrons. Events in CTC sample are concentrated in the low $| \eta_{\rm det} |$ because the CTC track finding efficiency quickly falls. The SVX sample events are populated more uniformly in $| \eta_{\rm det} |$.

• Figure 2.11 - The lepton charge signed pseudo-rapidity distribution of the lepton and the photon in the $W\gamma$ production.

• Figure 2.12 - The lepton charge signed pseudo-rapidity distribution of the lepton and the photon in $Z\gamma$ production.

• Figure 2.13 - The data point in the left figure represents the CDF measurements of $M_W$ and $M_{\rm top}$, and the point in the right figure represents the CDF II estimate for 2~fb$^{-1}$. The curves are from a calculation~\protect\cite{mwvsmtop} of the dependence of $M_W$ on $M_{\rm top}$ in the minimal standard model using several Higgs masses. The bands are the uncertainties obtained by folding in quadrature uncertainties on $\alpha(M_Z^2)$, $M_Z$, and $\alpha_s(M_Z^2)$.

• Figure 2.14 - Transverse mass distributions for $W\rightarrow e\nu$ and $W\rightarrow \mu\nu$ from Run Ia ($a$ and $b$) which gave a $\pm 180$ MeV/c$^2$ measurement of the $W$ mass, and the equivalent preliminary distributions from the first 67~pb$^{-1}$ of Run Ib ($c$ and $d$).

• Figure 2.15 - Left: The radial distributions for conversions (solid line) and background (dashed line). Right: Reconstructed photon conversion vertex density in the $r$-$\phi$ plane for the innermost super-layer in the CTC, folded into 1/30 of the circumference (this layer has 30-fold symmetry).

• Figure 2.16 - Change in derived $W \rightarrow e\nu$ mass ($\Delta M_W^e$) versus the signed deviation in units of standard deviations from the average Run Ia $W$ asymmetry measurement ($\zeta$) for various PDFs. The lower edge of the fitting region is $(a)$ 60, $(b)$ 65 , and $(c)$ 70~GeV Note that raising the lower edge of the fitting region makes the result less sensitive to PDFs, particularly for variation not correlated to the asymmetry.

• Figure 2.17 - Transverse mass distribution ($M_T^W$) for $W \rightarrow e\nu$ candidates along with background and signal expectation. The inset is the fit to $M_T^W > 110$ GeV/c$^2$.

• Figure 2.18 - Indirect and direct measurements of $\Gamma_W$ and the predicted uncertainty from the direct measurement for 2~fb$^{-1}$ of data. The dotted band represents the standard model prediction.

• Figure 2.19 - The double differential distribution d^2 / dy(\gamma)dy(\ell)$ for $p \bar p \rightarrow W^+\gamma \rightarrow \ell\nu\gamma$ (Left) and $Z\gamma \rightarrow \ell\ell\gamma$ (Right).

• Figure 2.20 - The measured cross sections of diboson productions and the theoretical predictions.

• Figure 2.21 - The lepton charge signed pseudo-rapidity difference distribution in the $W\gamma$ production for $| \eta_{\ell} | < 1.0$ and $| \eta_{\gamma} | < 1.0$ (Left) , and $| \eta_{\ell} | < 2.5$ and $| \eta_{\gamma} | < 2.5$ (Right) .

• Figure 2.22 - 95\% CL limits on anomalous couplings. Present limits (Left) and expected limits with 2~fb$^{-1}$ (Right) on $WWV$ $(V = W, \gamma)$ anomalous couplings.

• Figure 2.23 - Present limits on $ZZ\gamma$ anomalous couplings.

• Figure 2.24 - The invariant mass distribution of events in the high mass sample (Left) and the pole region sample (Right) .

• Figure 2.25 - Results of our measurement of A$_{FB}$, compared with a Standard Model calculation. The solid line is a bin-by-bin calculation of A$_{FB}$ (MRSA), and the dashed line is the same calculation integrated over the two mass regions.

• Figure 2.26 - Left: Combined Run Ia $W$ charge asymmetry measurement using muons and central and plug electrons. These data have been used as input in determining recent PDF sets. Right: Combined $W$ charge asymmetry using Run Ia and Ib data including the forward muons.

• Figure 2.27 - Drell-Yan dilepton $(e^+e^-, \mu^+\mu^-)$ production cross section from Run Ia and Ib as a function of the dilepton invariant mass.