Measurement of Rapidity Distribution for High Mass Drell-Yan ee Pairs at CDF

Abstract

We report on the first measurement of the rapidity distribution dsigma/dy over nearly the entire kinematic region of rapidity for e^+e^- pairs in the Z-boson region of 66<M_{ee}<116 GeV/c^2 and at higher mass M_{ee}>116 GeV/c^2. The data sample consists of 108 pb^{-1} of ppbar collisions at \sqrt{s}=1.8 TeV taken by the Collider Detector at Fermilab during 1992--1995. The total cross section in the $Z$-boson region is measured to be 252 +- 11 pb. The measured total cross section and dσ/dy are compared with quantum chromodynamics calculations in leading and higher orders.

Figures (2)

• Figure 1: The efficiency times acceptance for $e^+e^-$ pairs in the $Z$ boson mass region: (a) for the CC sample (asterisks), (b) for the CC+CP+CF sample (open circles), and (c) for the CC+CP+CF+PP+PF sample (solid circles).
• Figure 2: $d\sigma/dy$ distribution of $e^+e^-$ pairs: (a) in the $Z$ boson mass ($66<M_{ee}<116$ GeV/$c^2$) region. (b) in the high mass ($M_{ee}>116$ GeV/$c^2$) region. The $M$ used to obtain $x_1$ and $x_2$ in (b) is the mean mass over the bin. The error bars on the data include statistical errors only. The theoretical predictions have been normalized to the data in the $Z$ boson mass region.