125750099
STUDY FOR A RACETRACK FFAG BASED MUON RING COOLER
A design study for the muon cooling in scaling FFAG lattices with racetrack-shape in underway. The ring has straight sections with scaling FFAG magnets, which make enough space to install kicker magnets to inject and extract the muon beam. A muon cooling ring based on the PRISMFFAG has been studied. This paper reports progress of the study.
162176254
Development on Electromagnetic Calorimeter for COMET / PRISM
121688519
Symmetries and the mass ratio of the electron and muon
A model of symmetries and gauge interactions relating the electron and muon is considered. The model is based on the UL(1)⊗UR(1)⊗RL⊗RR group where UL(1)⊗UR(1) denotes the chiral e-μ rotation and RL⊗RR the chiral reflection of the electron field. The invariance under this group is spontaneously broken by the vacuum expectation values of scalar fields. A zeroth-order vacuum is found for which the zeroth-order electron mass vanishes, while one-loop corrections lead to a finite memμ ratio. The decay process μ → e + γ is strictly forbidden in this model.
122497415
R&D on Proton Extinction Monitor for COMET Project
The COMET experiment searches for a muon to electron conversion process that is one of the lepton flavor violation processes. We use an 8‐GeV pulsed proton beam. The proton extinction ratio is an important parameter. In order to measure this ratio pulse‐by‐pulse, we are developing a monitoring device. This device is called Proton Extinction Monitor and is a gas Cerenkov detector with gating photomultiplier tubes(PMT). The result of the investigation is that ethane is a promising gas for the Cerenkov radiator gas. A gating PMT is under development. We fabricated a divider circuit which switches at 10‐kHz and has a cutoff ratio of 10−6.
119500971
Possible existence of new medium interactions and 3.1- and 3.7-GeV particles
18393881
Intense Muon Physics Working Group Summary
The intense muon beams which will be available at a neutrino factory provide a unique opportunity for searching for physics beyond the standard model, both in lepton flavor violation and in the search for a permanent electric dipole moment for the muon. Other experiments which can use intense muon beams will also be possible.
26179931
Stable SU(5) monopoles with higher magnetic charge.
Taking into account the electroweak breaking effects, some multiply charged monopoles were shown to be stable by Gardner and Harvey. We give the explicit Ansa$uml: tze for finite-energy, nonsingular solutions of these stable higher-strength monopoles with eg = 1,(3/2),3. We also give the general stability conditions and the detailed behavior of the interaction potentials between two monopoles which produce the stable higher-strength monopoles.