Hirotaka Sugawara, KEK
Photon-photon collider Higgs factory as precursor to ILC
January 28, 2009

The most important task of LHC or subsequent ILC is to find the Higgs
particle and study its property. Since the degree of accuracy is much
better in the latter case we have to think that the two machines are
complimentary to each other.  In the usual electron-positron collider, the
way to produce Higgs boson is to rely on the reaction e(+)e(-)-->H+Z. You
produce Z boson together with H thus losing almost 100 GeV. The way to get
around this loss is to use a photon-photon collider.  In the theoretical
side, almost all the natural models (SM, MSSM, NMSSM, etc) support Higgs
mass of less that 170 GeV. It is, therefore very efficient to build a
photon-photon collider for the purpose of a Higgs factory. I would like to
propose this photon-photon collider as a precursor (not as an alternative)
to the ILC.  We will be able to cut the cost as much as half of ILC and
also will be able to avoid all the complicated issues related to the
positron beam.