The discovery of the Higgs boson by the Large Hadron Collider (LHC) experiments is a milestone in the
history of particle physics. By the discovery, the particle spectrum of the Standard Model (SM) could have been completed.
However, the SM cannot explain numerous fundamental facts and issues (mass hierarchy, dark matter, matter-antimatter asymmetry of the universe...).
The high center of mass energy available at the LHC may lead to the direct production of new fundamental particles
present in beyond the standard models (BSM) theories. Both, the discovery of new particles but also the absence
of such a discovery calls for precision measurements in e+e- collisions in which
the initial state is perfectly known and QCD backgrounds are absent.
The International Linear Collider (ILC) is a electron-positron linear collider designed for a cms energy of 250-
500 GeV using polarized beams. It is, at current date, the only energy frontier accelerator post-LHC era that is in
the engineering phase stage. It will provide unprecedented precision for the Higgs coupling measurements
that will allow extensive tests of the Higgs mechanism and the SM.
The ILC is also an ideal tool to measure electroweak couplings of fermions and in particular of
heavy quarks. All these precision measurements will allow to detect the onset of new physics or exclude the existence
of new physics up to several 10 TeV. In later phases of the ILC running (350, 500 GeV) the top-quark will then enter
in the game and open a wide new range of high precision measurements.
High precision physics at future colliders as the ILC
require unprecedented high precision in the determination of the energy of final state particles. The
needed precision will be achieved thanks to the Particle Flow algorithms (PF) which require highly
granular and hermetic calorimeters systems. The physical proof of concept of the PF was performed
in the previous campaign of beam tests of physic prototypes within the CALICE collaboration. One
of these prototypes was the physics prototype of the Silicon-Tungsten Electromagnetic Calorimeter
(SiW-ECAL) for the International Large Detector at the ILC.
