A Measurement of the Z Boson Transverse Momentum Distribution, and of the ZZ and WZ Production Cross Sections Using 7.3-8.6 fb$$^{-1}$$ of $$p\bar{p}$$ Collisions at $$\sqrt{s}$$ = 1.96 TeV
- Univ. of Manchester (United Kingdom)
Two analyses are performed with the large samples of dielectron and dimuon events collected by the D0 experiment at the Fermilab Tevatron $$p\bar{p}$$ collider. The dilepton transverse momentum ($$p_T$$) distribution in $$Z/\gamma^* → \ell^+\ell^-$$ production is a powerful probe of Quantum chromodynamics. Until now, this distribution has been measured with limited precision. An alternative variable, $$\phi^*_\eta$$, is proposed due to its relatively low susceptibility to detector effects. The $$\phi^*_\eta$$, distribution of events with $$Z/\gamma^* → \ell^+\ell^-$$ invariant masses between 70 and 110 GeV, is measured in three bins of dilepton rapidity. This measurement, with 7.3 fb$$^{-1}$$ of data, is significantly more precise than previous measurements of the $$p_T$$ distribution. A state-of-the-art QCD Monte Carlo program is in modest agreement with the data. Using 8.6 fb$$^{-1}$$ of data, the $$ZZ/\gamma^* → \nu\bar{\nu}\ell^+\ell^-$$ and $$WZ/\gamma^* → \ell\nu\ell^+\ell^-$$ processes are studied, yielding production cross sections of, $$\sigma(p\bar{p} \rightarrow ZZ/\gamma^*)$$ = 1.64 $$\pm$$ 0.46 p b and $$\sigma(p\bar{p} \rightarrow WZ/\gamma^*)$$ = 4.46 $$\pm$$ 0.64 pb, for $$Z/\gamma^* → \ell^+\ell^-$$ invariant masses between 60 and 130 GeV. These are in agreement with Standard Model predictions.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1247697
- Report Number(s):
- FERMILAB-THESIS-2011-35; 1083675
- Country of Publication:
- United States
- Language:
- English
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