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Mu2e general presentation. Particle physics frontiers. Neutrino experiments (NOvA, LBNE, MINOS, MINERvA, and others… ) Precision measurements (g-2) Rare decays ( Mu2e ). Mu2e collaboration. The lepton flavor violation. Neutrinos have mass, so in the SM we can have. Rate < 10 -54 - PowerPoint PPT Presentation
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Giovanni OnoratoFermilab
University of Rome “Guglielmo Marconi”INFN Lecce
Mu2e general presentation
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Particle physics frontiers
-Neutrino experiments (NOvA, LBNE, MINOS, MINERvA, and others… )-Precision measurements (g-2)-Rare decays (Mu2e)
Mu2e collaboration
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The lepton flavor violation
Neutrinos have mass, so in the SM we can have
Rate < 10-54
(unmeasurably low)
In new physics models one can have
or in presence of a nucleus…
Experiments:Mu2e, SINDRUM II, TRIUMF, COMMET, and others…
Rate ~ 10-
15
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Present measurements
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Mu2e achievements
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Experimental setup 1
•Proton beam hits production target in Production Solenoid.•Pions captured and accelerated towards Transport Solenoid by graded field.•Pions decay to muons.
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Experimental setup II
•Transport solenoid performs sign and momentum selection.•Eliminates high energy negative particles, positive particles and line-of-sight neutrals.
•Muons captured in stopping target.•Conversion electron trajectory measured in tracker, validated in calorimeter.•Cosmic Ray Veto surrounds Detector Solenoid.
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Dominant background
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Other background sources
-Radiative muon/pion capture-Photon produced that can convert asymmetrically-Beam electrons can scatter in target-Muon/pion decay in flight-Antiprotons and other late arriving particles-Cosmic-ray induced electrons-Protons - Neutrons - Photons from Nuclear capture
None of them produce a sharp peak at 105 MeV:they need to be well known and controlled.
Work is going on on this
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Detectors: the T-Tracker
18 stations + Stiffening rings at ends12 panels, at 30° rotations, form a station30° stereo angles give 400m resolution along wireStraw termination and readout at r>70cm
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T-Tracker: straws structure
5mm strawsGaps between strawsDouble layer
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Alt. ITracker (from INFN Lecce)
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The calorimeter (from INFN Frascati/Pisa)
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Location
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Time schedule
