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\section{\ref{sec:conclusion} Conclusion}
\label{sec:conclusion}
The discovery
of the H(126) particle at the LHC
of a particle that resembles strongly the long-sought Higgs boson of the Standard Model has
focused placed in a new perspective studies for the next
large machine
needed for high-energy physics.
While brand-new ideas are emerging for future Higgs factories, the The prospects for the next decade already look quite promising: the HL-LHC is
indeed an impressive Higgs factory, with great potential for
measuring many Higgs
boson coupling measurements to couplings with accuracies of a few
per-cent accuracy. per-cent. The
LHC run at 13-14 TeV may
well discover something else,
unfortunately likely to and it would be
beyond premature to mortgage the future of high-energy physics before knowing what it reveals. In the
ILC reach. mean time new ideas are emerging for possible future Higgs factories.
Beyond In view of the
HL-LHC, it is now generally accepted that financial, technical and personal resource needs for the next large high-energy physics machine, it is
important essential to choose the right
machine, as not machine that is complementary to
mortgage the future of the discipline with a suboptimal choice (given the cost of these machines). To cut a long story short, the
right machine must bring orders of magnitude LHC, with
respect to optimal capabilities beyond what can be achieved
at LHC, both with HL-LHC, in
both precision measurements
and in and/or discovery potential.
As alluded to in this article, it turns out that the ILC project has neither of these capabilities, with both too small a luminosity and too small a centre-of-mass energy.
Instead, In our view, TLEP, a large $\epem$ circular collider
seems in a tunnel with 80 to
be the 100~km circumference, would best complement
to the LHC,
with as it would provide {\it (i)}
a per-mil precision
on in measurements of Higgs
couplings; couplings, {\it (ii)}
an unbeatable unique precision
on EWSB in measurements of electroweak symmetry-breaking parameters and
on the strong coupling
constant; constant, {\it (iii)} a measurement of the number of
active neutrinos neutral particles equivalent to better than
0.001; 0.001 of a conventional neutrino species, and {\it (iv)} a unique search programme for rare Z, W, Higgs, and top
decays; and {\it (v)} a very competitive cost. Circular decays. We emphasize that circular $\epem$ colliders
have also the most use a mature
technology: they are supported by technology that has been developed during the progress of
successive $\epem$
factories for 20 years, and it turns out machines over 50 years. Many of the key technical advances that
make TLEP possible will be demonstrated by SuperKEKB,
with which has many parameters similar to
TLEP, TLEP. Experience with SuperKEKB will
be a precious demonstrator. Based on this experience, make possible more reliable estimates of the cost,
the power, and
the luminosity predictions
will be reliable. Most importantly, for TLEP. Moreover, TLEP
is also would be a
first step stepping-stone towards a 100 TeV pp collider
in the same tunnel, and
therefore provides a unique long-term vision for high-energy physics.
The design study of TLEP has now started, in close collaboration with the VHE-LHC design study, with worldwide collaboration from Asia, USA and Europe, and with full support from the CERN Council. The study is now acted in the approved CERN Medium-Term Plan (2014-2018). The first proposed step is a design study report in 2015, towards a conceptual design report and a detailed cost estimate in 2018-2019, for an informed decision to be taken in full knowledge of the LHC results at 13-14 TeV. A solid backbone exists for both the design and the rich, albeit demanding, physics case of TLEP.
We aim for physics in 2030.
The design study of TLEP has now started, in close collaboration with the VHE-LHC design study, with worldwide collaboration from Asia, USA and Europe, and with full support from the CERN Council. The study is now included in the approved CERN Medium-Term Plan for the years 2014-2018. The first proposed step is a design study report in 2015, be followed by a conceptual design report and a detailed cost estimate in 2018-2019. In this paper, we have provided a first look at the possible physics of TLEP, which may serve as a baseline for exploration of its rich physics possibilities during this period. An informed decision on the project could then be taken in full knowledge of the LHC results at 13-14 TeV and operational experience with SuperKEKB. Technically, TLEP could be ready for physics in 2030, if given the necessary financial and political support.