EPS-HEP 2015

Higgs Physics at CLIC
  • Speaker: Sophie Redford (CERN)
  • Status: abstract accepted for oral presentation, ID 295
  • Abstract: The Compact Linear Collider (CLIC) is an attractive option for a future multi-TeV linear electron-positron collider, offering the potential for a rich precision physics programme, combined with sensitivity to a wide range of new phenomena. The physics reach of CLIC has been studied for several centre-of-mass energies. A staged construction and operation of CLIC provides the ideal scenario for precise studies of the properties of the ~125 GeV Higgs boson. Operation at a few hundred GeV allows the couplings and width of the Higgs boson to be determined in a model-independent manner through the study of the Higgsstrahlung and WW-fusion processes. Operation at higher centre-of-mass energies provides high statistics and the potential to study the top Yukawa coupling. At the highest energy (presently planned to be 3 TeV c.m.) the Higgs boson self-coupling can be accurately measured. In this talk we explore the potential of the CLIC Higgs physics programme, based on full simulation studies of a wide range of final states. Dedicated studies to identify the optimal low-energy stage of CLIC for Higgs physics are shown. The evolution of the physics sensitivity with centre-of-mass energy is presented in terms of a model-independent global fit of the couplings and the total width and constrained kappa fits employed by the LHC experiments.

Physics beyond the standard model at CLIC
  • Speaker: to be definded
  • Status: abstract submitted for oral presentation, ID 296
  • Abstract: The Compact Linear Collider (CLIC) is an attractive option for a future multi-TeV linear electron-positron collider. A staged construction in centre-of-mass energy steps from a few hundred GeV up to 3 TeV is foreseen. At high energies, CLIC provides sensitivity to a wide range of phenomena beyond the Standard Model. An overview of these opportunities is given in this presentation. The studies are based on full detector simulations using Geant4 and considering pileup from gamma gamma -> hadrons interactions. The properties of new particles with masses smaller than half the centre-of-mass energy can be measured precisely using pair production events. CLIC is particularly well suited for weakly interacting states due to the clean experimental conditions and low backgrounds compared to hadron colliders. In addition, indirect searches for new physics through precision observables give access to much higher mass scales. Examples for both approaches will be discussed.

Status of vertex and tracking detector R&D at CLIC
  • Speaker: Elena Firu (Institute of Space Science)
  • Status: abstract accepted for poster presentation, ID 297
  • Abstract: The physics aims at the future CLIC high-energy linear e+e- collider set very high precision requirements on the performance of the vertex and tracking detectors. Moreover, these detectors have to be well adapted to the experimental conditions, such as the bunch train structure of the beam and the presence of beam-induced backgrounds. The principal challenges are: a point resolution of a few micron, ultra-low mass (~0.2% X0 per layer for the inner vertex region), very low power dissipation (compatible with air-flow cooling in the inner vertex region) and pulsed power operation, complemented with ~10 ns time stamping capabilities. An overview of the R&D program for pixel and tracking detectors at CLIC will be presented, including recent results on an innovative hybridisation concept based on capacitive coupling between active sensors (HV-CMOS) and readout ASICs (CLICpix).

Top quark physics a future linear collider
  • Speaker: Roman Pöschl (CNRS/LAL)
  • Status: abstract accepted for oral presentation
  • Abstract: The International Linear Collider and Compact Linear Collider projects aim to build a linear electron-positron collider with a center-of-mass energy well above the top quark pair production threshold. In this contribution an overview is presented of the potential of their top quark precision physics programme. One of the highlights is a precise determination of the top quark mass through a scan of the center-of-mass energy around the pair production threshold, that is expected to yield a total uncertainty on the top quark MSbar mass of less than 50 MeV. The results of a full-simulation analysis are presented, including a discussion of the main systematic uncertainties. Full simulation results are also presented for measurements of the top quark couplings to the Z-boson and the photon. The anomalous form factors are expected to be constrained to better than 1\%, significantly beyond the expected precision at the Large Hadron Collider. Further new results are presented for the sensitivity to non-standard top quark decays and its interaction with the Higgs boson.
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Topic revision: r4 - 2015-07-06 - EvaSicking
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