Speaker
Dr
sestini lorenzo
(INFN)
Description
In order to further consolidate the present kwnoledge of the
Standard Model and to look for deviations from its predictions
that would signal new physics effects a new generation of hadron
hadron or electron position colliders is often put forward.
However also the idea of a muon collider seems to be attractive
because such a machine would provide the high centre of mass
energy typical of a hadron hadron machine in the clean experimental
environement typical of an electron position machine.
Hence the muon collider can serve as a Higgs factory, can
explore the multi-TeV frontier and can be used to investigate rare
muon processes, including any process related to lepton universality
violation in the muon sector.
Clearly the muon collider has to face quite a few challenges.
One of these is the production of a low emittance muon / antimuon
beam to be feed into a suitable accelerator complex.
Recently the idea of getting such muons / antimuons from collisions
of an about 45 GeV low emittance positrons beam on fixed target
has been put forward. The 45 GeV incident positron energy is chosen
because it corresponds to the energy threshold of the process
e+ e- -> mu+ mu-
which, at threshold, should give the wanted muon / antimuon low
emittance particles flux.
The experimental proof of this expectation is the goal of the
Low EMittance Muon Accelerator (LEMMA) collaboration who carried
out in Summer 2017 a dedicated test beam at the CERN H4 experimental
area.
The test beam was based on a silicon telescope setup complemented
by a dipole magnetic field, a muon chamber and a set of calorimeters,
to tag electrons / positrons.
The ultimate goal of the LEMMA collaboration is the measurement of the
emittance of the produced muon / antimuon particles flux and
of the corresponding cross section at threshold.
The concepts and the experimental setup used in Summer 2017 will be
presented together with a summary of the results of the test beam.
Primary authors
Mr
bertolin alessandro
(INFN)
Dr
sestini lorenzo
(INFN)
