Measurement of dsigma/DM Forward-Backward Charge Asymmetry for High Mass Drell-Yan e+e- Pairs from p-pbar Collisions at sqrt(s)=1.8 TeV

Abstract

We report on a measurement of the mass dependence of the forward-backward charge asymmetry, A_FB, and production cross section dsigma/dM for e+e- pairs with mass M_ee>40 GeV/c2. The data sample consists of 108 pb-1 of p-pbar collisions at sqrt(s)=1.8 TeV taken by the Collider Detector at Fermilab during 1992-1995. The measured asymmetry and dsigma/dM are compared with the predictions of the Standard Model and a model with an extra Z' gauge boson.

Figures (1)

• Figure 1: (a) $d\sigma/dM$ distribution of $e^+e^-$ and $\mu^+\mu^-$ pairs. All errors (except for the overall 3.9 $\%$ luminosity error) have been combined in quadrature.The Standard Model theoretical predictions (solid line) have been normalized by a factor of 1.11 to the data in the $Z$ boson mass region. Also shown are $e^+e^-$ measurements from DO /. (b) $A_{FB}$ versus mass compared to the Standard Model expectation (solid line). Also, predicted theoretical curves for $d\sigma/dM$ and $A_{FB}$ with an extra $E_6$$Z'$ boson (width of 10$\%$) with $M_{Z'}$=350 (dotted line) and 500 GeV$/c^2$ (dashed line). The inset in (a) shows the difference between the $d\sigma/dM$ CDF data for $e^+e^-$ pairs and the Standard Model prediction (on a linear scale) compared to expectation from these two $Z'$ models.