# ILC and the 3 LHC scenarios

The most prevalent issue in high energy physics, today, is to devise the best strategy to go beyond the current knowledge frontier. What is the most appropriate collider technology for the next step? e+e- or pp?, linear or circular? It is well known that high precision Higgs and top quark measurements far beyond what LHC can deliver are necessary and a strong motivation for an e+e- collider. However, it is essential to investigate in details what such a collider would provide under any of the possible three following scenarios:

• LHC discovers no new particles, beyond the Higgs or
• LHC discovers some new low-mass states or
• LHC discovers new heavy particles.

These 3 inclusive scenarios have been bluntly addressed in a recent arXiv:1702.05333 paper: “The Potential of the ILC for Discovering New Particles“. The executive summary kindly prepared by the authors gives clear cut statements related to the 3 scenarios. It is reproduced in the following with a couple of highlighted figures Read more “ILC and the 3 LHC scenarios”

# Ten Times Better than the LHC

The LHC program is in excellent shape, it will continue its journey throughout a series of upgrades up to its highest luminosity (sensitivity) until 2035. As for today, after the Higgs ($H$) discovery, the accumulated data do not reveal any sign of a new particle. With increasing sensitivity, its potential for discovery will improve and new particles may show up that would dramatically change the course of high-energy physics (HEP). However LHC has inherent weaknesses that will limit its sensitivity no matter how high the integrated luminosity is or how long the collider runs. Take for example, the measurement of the Higgs couplings to fermions or bosons. These couplings are sensitive to the imprint of possible new particles beyond the Standard Model (SM).  The side figure, here, has been at the center of many discussions at the last Linear Collider workshop in Morioka December 2016. I’ll try to describe it here in some details. Read more “Ten Times Better than the LHC”