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Top quark electroweak couplings at future lepton colliders.

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Future colliders like the ILC and CLIC can significantly probe new physics in top quark interactions, reaching mass scales far beyond the LHC. Combining top quark data with Z-pole measurements enhances these constraints.

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Area of Science:

  • High Energy Physics
  • Particle Physics
  • Collider Physics

Background:

  • The Standard Model of particle physics has been highly successful but does not explain phenomena like dark matter or neutrino masses.
  • New physics beyond the Standard Model (BSM) is expected to manifest at higher energy scales, potentially affecting top quark interactions.
  • Understanding top quark sector physics is crucial for BSM searches.

Purpose of the Study:

  • To comparatively study the reach of future collider options for non-resonant new physics effects in the top quark sector.
  • To analyze electroweak top quark pair production at the International Linear Collider (ILC) and the Compact Linear Collider (CLIC).
  • To quantify the sensitivity to higher-dimensional operators in the top quark sector.

Main Methods:

  • Simulation of benchmark scenarios for top quark pair production at the ILC and CLIC.
  • Analysis of electroweak top quark pair production cross-sections and asymmetries.
  • Inclusion of beam polarization effects and combination with precision Z-pole measurements from LEP1.

Main Results:

  • Both ILC and CLIC demonstrate the potential to constrain new physics mass scales up to the few TeV range.
  • These future colliders offer an orders-of-magnitude improvement in sensitivity compared to the Large Hadron Collider (LHC).
  • Forward-backward asymmetries and beam polarization are identified as key observables for probing new physics.

Conclusions:

  • Future colliders, particularly the ILC and CLIC, will provide unprecedented sensitivity to new physics in the top quark sector.
  • The combination of top quark observables with precision electroweak measurements can resolve degeneracies in the parameter space of new physics models.
  • These studies highlight the importance of precision measurements and advanced analysis techniques for discovering physics beyond the Standard Model.