Dirac and Majorana neutrinos with masses from 200 GeV to 3.2 TeV are considered. The analysis is based on the WHIZARD event generation and fast simulation of the detector response with DELPHES. We studied the possibility of observing production and decays of heavy neutrinos in qql final state at the ILC running at 500 GeV and 1 TeV and the CLIC running at 3 TeV. Such neutrinos with masses above the EW scale could be produced at future linear e+e- colliders, like the Compact LInear Collider (CLIC) or the International Linear Collider (ILC).
Among others, heavy neutrinos of the Dirac or Majorana nature were proposed to solve problems persistent in the Standard Model. Moreover, in many models of the New Physics, baryon asymmetry or dark matter density in the universe are explained by introducing new species of neutrinos. The mass hierarchy and oscillations, as well as the nature of their antiparticles, are currently being studied in experiments around the world. Neutrinos are probably the most mysterious particles of the Standard Model. Heavy Neutrinos at Future Linear e+e- Colliders The studies were done using the sgv fast simulation adapted to the ILD detector concept at the ILC. For selected benchmarks, the prospect for measuring masses and polarised cross-sections will be shown. A detailed study of the 'worst' scenario for stau exclusion/discovery taking into account the effect of the stau mixing on stau production cross-section and efficiency is presented. The capability of the ILC for determining exclusion/discovery limits for the stau in a model-independent way is shown in this contribution, together with an overview of the current state-of-the-art. The ILC, a future electron-positron collider with energy up to 1 TeV, is a promising scenario for SUSY searches. The LHC exclusion reach extends to higher masses for large mass differences, but under strong model assumptions. The current model-independent stau limits come from analysis performed at LEP but they suffer from the low energy of this facility.
Secondly the signature of stau pair production signal events is one of the most difficult ones, yielding to the 'worst' and so most global scenario for the searches. First of all the stau is with high probability the lightest of the scalar leptons. The direct pair-production of the tau-lepton superpartner, stau, is one of the most interesting channels to search for SUSY. Prospects for stau searches and measurements at the ILC #129 The studies are based on the ILD concept at the ILC. The cases discussed include the light Higgsino, the stau lepton in the coannihilation region relevant to dark matter, and heavy vector bosons coupling to the s-channel in e+e- annihilation. This talk will review a number of these scenarios and present the expectations for searches at an electron-positron collider such as the International Linear Collider. New physics searches with the ILD detector at the ILC # 130Īlthough the LHC experiments have searched for and excluded many proposed new particles up to masses close to 1 TeV, there are many scenarios that are difficult to address at a hadron collider. The importance of operating at different center of mass energies and the discovery potential in terms of Randall-Sundrum models with warped extra dimensions will be outlined. We will show with detailed detector simulations of the International Large Detector (ILD) that production rate and the forward backward asymmetries of the the different processes can be measured at the 0.1% - 0.5% level and how systematic errors can be controlled to reach this level of accuracy.
Strange, charm and bottom production are already available below the ttbar threshold. All four processes call for superb primary and secondary vertex measurements, a high tracking efficiency to correctly measure the vertex charge and excellent hadron identification capabilities. Quarks, specially the heaviers, are likely messengers to new physics and at the same time they are ideal benchmark processes for detector optimisation. Furthermore, polarised beams as available at the International Linear Collider (ILC) are an essential input for the complete measurement of the helicity amplitudes that govern the production cross section. Measurement of sigma(e+e-qq with qq=ss,cc,bb,tt plays a central role in the physics programs of high energy electron-positron colliders operating from the O(100GeV) to O(1TeV) center of mass energies.