Anaïs Tilquin

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The cross sections and forward-backward asymmetries of hadronic and leptonic events produced in ee collisions at centre-of-mass energies from 130 to 183 GeV are presented. Results for ee, μμ, ττ, qq̄, bb̄ and cc̄ production show no significant deviation from the Standard Model predictions. This enables constraints to be set upon physics beyond the Standard(More)
A search has been performed for the Standard Model Higgs boson in the data sample collected with the ALEPH detector at LEP, at centre-of-mass energies up to 209GeV. An excess of 3σ beyond the background expectation is found, consistent with the production of the Higgs boson with a mass near 114GeV/c2. Much of this excess is seen in the four-jet analyses,(More)
The Supernova / Acceleration Probe (SNAP) is a proposed space-based experiment designed to study the dark energy and alternative explanations of the acceleration of the Universe’s expansion by performing a series of complementary systematics-controlled astrophysical measurements. We here describe a 1Lawrence Berkeley National Laboratory 2Stanford Linear(More)
Hadronic Z decays into three jets are used to test QCD models of colour reconnection (CR). A sensitive quantity is the rate of gluon jets with a gap in the particle rapidity distribution and zero jet charge. Gluon jets are identified by either energy-ordering or by tagging two b-jets. The rates predicted by two string-based tunable CR models, one(More)
Theory predicts that sexual reproduction is difficult to maintain if asexuality is an option, yet sex is very common. To understand why, it is important to pay attention to repeatably occurring conditions that favour transitions to, or persistence of, asexuality. Geographic parthenogenesis is a term that has been applied to describe a large variety of(More)
  • Ch Y ` Eche, A Ealet, +4 authors D Yvon
  • 2008
A major quest in cosmology is the understanding of the nature of dark energy. It is now well known that a combination of cosmological probes is required to break the underlying degeneracies on cosmological parameters. In this paper, we present a method, based on a frequentist approach, to combine probes without any prior constraints, taking full account of(More)
  • J.-M Virey, D Talon-Esmieu, A Ealet, P Taxil, A Tilquin
  • 2008
Constraining simultaneously the dark energy equation of state and the curvature of the universe is difficult due to strong degeneracies. To circumvent this problem when analyzing data it is quite usual to assume flatness to constrain dark energy, or conversely, to assume that dark energy is a cosmological constant to constrain curvature. Such assumptions(More)
A search for γγ decays of a Higgs boson is performed in the data sample collected at LEP with the ALEPH detector between 1991 and 1999. This corresponds to an integrated luminosity of 672 pb at centre-of-mass energies ranging from 88 to 202 GeV. The search is based on topologies arising from a Higgs boson produced in association with a fermion pair via the(More)
The production of WW pairs is analysed in a data sample collected by ALEPH at a mean centre-of-mass energy of 188.6 GeV, corresponding to an integrated luminosity of 174.2 pb. Cross sections are given for different topologies of W decays into leptons or hadrons. Combining all final states and assuming Standard Model branching fractions, the total W-pair(More)
Indirect limits on the mass of the lightest neutralino are derived from the results of searches for charginos, neutralinos, and sleptons performed with data taken by the ALEPH Collaboration at centre-of-mass energies near the Z peak and at 130 and 136 GeV. Within the context of the Minimal Supersymmetric Standard Model and whenMν̃ ≥ 200 GeV/c, the boundMχ >(More)