Status of the X17 search in Montreal Azuelos, G.; Bryman, D.; Chen, W.C. ...
Journal of physics. Conference series,
12/2022, Letnik:
2391, Številka:
1
Journal Article
Recenzirano
Odprti dostop
Abstract
At the Montreal Tandem accelerator, an experiment is being set up to measure internal pair creation from the decay of nuclear excited states using a multiwire proportional chamber and ...scintillator bars surrounding it from the Daphne experiment. The acceptance covers a solid angle of nearly 4π. Preamplifiers and the data acquisition hardware have been designed and tested. The
7
LiF target, mounted on an Al foil and water-cooled is in a thin carbon fiber section of the beamline. The experiment will focus at first on a measurement of the internal pair creation from the 18.15 MeV state of
8
Be with the aim of observing independently the X17 particle discovered by the ATOMKI experiment. Assuming the ATOMKI evaluation of the electron-pair production rate from X17, Geant4 simulation predicts observation of a clear signal after about 2 weeks of data taking with 2
μ
A proton beam. The IPC measurement could eventually be extended to the giant dipole resonance of
8
Be, as well as to other nuclei, in particular to
10
B.
AbstractThe potential for the discovery of a Standard Model Higgs boson in the mass range mH < 2 mZ in the vector boson fusion mode has been studied for the ATLAS experiment at the LHC. The ...characteristic signatures of additional jets in the forward regions of the detector and of low jet activity in the central region allow for an efficient background rejection. Analyses for the H → WW(*) and H → ττ decay modes have been performed using a realistic simulation of the expected detector performance. The results obtained demonstrate the large discovery potential in the H → WW(*) decay channel and the sensitivity to Higgs boson decays into τ-pairs in the low-mass region around 120 GeV/c2.
Discovering Technicolor Andersen, J. R.; Antipin, O.; Azuelos, G. ...
European physical journal plus,
09/2011, Letnik:
126, Številka:
9
Journal Article
Recenzirano
Odprti dostop
We provide a pedagogical introduction to extensions of the Standard Model in which the Higgs is composite. These extensions are known as models of dynamical electroweak symmetry breaking or, in ...brief, Technicolor. Material covered includes: motivations for Technicolor, the construction of underlying gauge theories leading to minimal models of Technicolor, the comparison with electroweak precision data, the low-energy effective theory, the spectrum of the states common to most of the Technicolor models, the decays of the composite particles and the experimental signals at the Large Hadron Collider. The level of the presentation is aimed at readers familiar with the Standard Model but who have little or no prior exposure to Technicolor. Several extensions of the Standard Model featuring a composite Higgs can be reduced to the effective Lagrangian introduced in the text. We establish the relevant experimental benchmarks for Vanilla, Running, Walking, and Custodial Technicolor, and a natural fourth family of leptons, by laying out the framework to discover these models at the Large Hadron Collider.
AbstractWe discuss possible searches for the new particles predicted by Little Higgs Models at the LHC. By using a simulation of the ATLAS detector, we demonstrate how the predicted quark, gauge ...bosons and additional Higgs bosons can be found and estimate the mass range over which their properties can be constrained.
AbstractKaluza-Klein excitations of the gauge bosons are a notable feature of theories with “small” (~ 1 TeV) extra dimensions. The leptonic decays of the excitations of γ and Z bosons provide a ...striking signature which can be detected at the LHC. We investigate the reach for these signatures through a parametrized simulation of the ATLAS detector. With an integrated luminosity of 100 fb–1 a peak in the lepton-lepton invariant mass will be detected if the compactification scale (Mc) is below 5.8 TeV. If no peak is observed, with an integrated luminosity of 300 fb–1 a limit of Mc<12–13.5 TeV can be obtained from a detailed study of the shape of the lepton-lepton invariant mass distribution. If a peak is observed, the study of the angular distribution of the two leptons will allow to distinguish the KK excitations from alternative models yielding the same signature.PACS: 11.10Kk – 11.25Mj – 13.85-t
Uncertainty About the Higgs Azuelos, Georges
Science (American Association for the Advancement of Science),
08/1999, Letnik:
285, Številka:
5430
Journal Article
EXOTIC is a new Monte Carlo generator for pair or single production of heavy fermions and excited fermions at e
+e
− colliders. By a choice of generalized couplings, it can be used to simulate the ...processes of production of heavy fermions in various scenarios beyond the Standard Model. The matrix elements include full spin correlations in the production and decay processes.
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