Dr Elizabeth Gallas

Abstract:

This Letter describes the search for a new heavy charged gauge boson W′ decaying into an electron and a neutrino. The data were collected with the D0 detector at the Fermilab Tevatron pp̄ Collider at s=1.96TeV, and correspond to an integrated luminosity of about 1fb-1. Lacking any significant excess in the data in comparison with known processes, an upper limit is set on σW′×B(W′→eν), and a W′ boson with mass below 1.00 TeV can be excluded at the 95% C.L., assuming standard-model-like couplings to fermions. This result significantly improves upon previous limits and is the most stringent to date. © 2008 The American Physical Society.

Abstract:

Data collected by the D0 detector at a p over(p, ̄) center-of-mass energy of 1.96 TeV at the Fermilab Tevatron Collider have been used to search for pair production of the lightest supersymmetric partner of the top quark decaying into b ℓ over(ν, ̃). The search is performed in the ℓ ℓ′ = e μ and μμ final states. No evidence for this process has been found in data samples of approximately 400 pb-1. The domain in the [M (over(t, ̃)1), M (over(ν, ̃))] plane excluded at the 95% C.L. is substantially extended by this search. © 2007 Elsevier B.V. All rights reserved.

Abstract:

We present a measurement of the muon charge asymmetry from W boson decays using 0.3fb-1 of data collected at s=1.96GeV between 2002 and 2004 with the D0 detector at the Fermilab Tevatron pp̄ Collider. We compare our findings with expectations from next-to-leading-order calculations performed using the CTEQ6.1M and MRST04 NLO parton distribution functions. Our findings can be used to constrain future parton distribution function fits. © 2008 The American Physical Society.

Abstract:

We present a study of events with Z bosons and associated jets produced at the Fermilab Tevatron collider in p over(p, ̄) collisions at a center of mass energy of 1.96 TeV. The data sample consists of nearly 14 000 Z / γ* → e+ e- candidates corresponding to an integrated luminosity of 0.4 fb-1 collected with the DØ detector. Ratios of the Z / γ* + ≥ n jet cross sections to the total inclusive Z / γ* cross section have been measured for n = 1 - 4 jets, and found to be in good agreement with a next-to-leading order QCD calculation and with a tree-level QCD prediction with parton shower simulation and hadronization.