Measurement of the Shape of the Transverse Momentum Distribution of W Bosons Produced in pbarp Collisions at sqrt(s)= 1.8 TeV

Abstract

The shape of the transverse momentum distribution of W bosons (p_T(W)) produced in pbarp collisions at sqrt(s)= 1.8 TeV is measured with the DO detector at Fermilab. The result is compared to QCD perturbative and resummation calculations over the p_T(W) range from 0-200 GeV/c. The shape of the distribution is consistent with the theoretical prediction.

Figures (3)

• Figure 1: The transverse mass (left) and $\not\!\!E_T$ (right) distributions for three $p_T^{W}$ bins. The points are the DØ data. The solid histogram is the sum of the Monte Carlo signal and the estimated background. The dotted histogram is the estimated background alone.
• Figure 2: The $W$ boson transverse momentum spectrum, showing the DØ result (solid points) with statistical uncertainty. The theoretical calculation by Arnold and Kauffman [4], smeared for detector resolutions, is shown as two lines corresponding to the $\pm 1\sigma$ variations of the uncertainties in the detector modelling. Within each bin, the values are plotted at the mean $p_T^{W}$. The fractional systematic uncertainty on the data is shown as a band in the lower portion of the plot. The values of the uncertainties for different $p_T^{W}$ bins are $100\%$ correlated with each other. Upward fluctuations in the magnitude of the multijet background cause the widening observed in the band at about 60 and $100\;\rm GeV/\it c$ in $p_T^{W}$.
• Figure 3: The ratio (Data--Theory)/Theory shown as a function of $p_T^{W}$ with its statistical uncertainty as error bars. Within each bin, the values are plotted at the mean $p_T^{W}$. The theory corresponds to reference [4], smeared for detector resolutions. The systematic uncertainties from data (background and efficiency) and from the detector modelling are added in quadrature and shown as a band.