5,901 research outputs found
Inverse Neutrino-less Double Beta Decay Revisited: Neutrinos, Higgs Triplets and a Muon Collider
We revisit the process of inverse neutrino-less double beta decay (e e -> W
W) at future linear colliders. The cases of Majorana neutrino and Higgs triplet
exchange are considered. We also discuss the processes e mu -> W W and mu mu ->
W W, which are motivated by the possibility of muon colliders. For heavy
neutrino exchange and center-of-mass energies larger than 1 TeV, we show that
masses up to 10^6 (10^5) GeV could be probed for e-e and e-mu machines,
respectively. The stringent limits for mixing of heavy neutrinos with muons
render mu mu -> W W less promising, even though this process is not constrained
by limits from neutrino-less double beta decay. If Higgs triplets are
responsible for inverse neutrino-less double beta decay, observable signals are
only possible if a very narrow resonance is met. We also consider unitarity
aspects of the process in case both Higgs triplets and neutrinos are exchanged.
An exact see-saw relation connecting low energy data with heavy neutrino and
triplet parameters is found.Comment: 19 pages, 6 figure
High Energy Colliders
We consider the high energy advantages, disadvantages and luminosity
requirements of hadrons, leptons and photon-photon colliders. Technical
problems in obtaining increased energy in each type of machine are presented.
The machines relative size are also discussed.Comment: LaTeX, 27 pages, 8 figures (eps, ps). Submitted to the Proceedings of
the Princeton's 250th Anniversary Conference on Critical Problems in Physic
Final Focus System for a Muon Collider: A Test Model
The present scenario for a high luminosity 4 TeV on center of mass muon
collider requires a beta function =3 mm at the interaction point. We discuss a
test model of a basic layout which satisfies the requirements although it is
not fully realistic.Comment: 9 pages, uses REVTEX macros. Submitted to the Proceedings of the
Symposium on Physics Potential and Development of mu^+-mu^- Colliders, San
Francisco, CA. Suppl. of the journal Nuclear Physics
High Luminosity Muon Collider Design
Muon Colliders have unique technical and physics advantages and disadvantages
when compared with both hadrons and electron machines. They should be regarded
as complementary. Parameters are given of a 4 TeV high luminosity muon-muon
collider, and of a 0.5 TeV demonstration machine. We discuss the various
systems in such muon collider.Comment: LaTeX 5 pages 4 figure
Future Colliders
The high energy physics advantages, disadvantages and luminosity requirements
of hadrons, of leptons and photon-photon colliders are considered. Technical
arguments for increased energy in each type of machine are presented. Their
relative size, and the implications of size on cost are discussed.Comment: LaTeX, 10 pages, 10figure
A new proof of a Nordgren, Rosenthal and Wintrobe Theorem on universal operators
A striking result by Nordgren, Rosenthal and Wintrobe states that the Invariant Subspace Problem is equivalent to the fact that any minimal invariant subspace for a composition operator Cφ induced by a hyperbolic automorphism φ of the unit disc D acting on the classical Hardy space H² is one dimensional. We provide a completely different proof of Nordgren, Rosenthal and Wintrobe’s Theorem based on analytic Toeplitz operators
Blade loss transient dynamics analysis, volume 1. Task 2: TETRA 2 theoretical development
The theoretical development of the forced steady state analysis of the structural dynamic response of a turbine engine having nonlinear connecting elements is discussed. Based on modal synthesis, and the principle of harmonic balance, the governing relations are the compatibility of displacements at the nonlinear connecting elements. There are four displacement compatibility equations at each nonlinear connection, which are solved by iteration for the principle harmonic of the excitation frequency. The resulting computer program, TETRA 2, combines the original TETRA transient analysis (with flexible bladed disk) with the steady state capability. A more versatile nonlinear rub or bearing element which contains a hardening (or softening) spring, with or without deadband, is also incorporated
Muon Dynamics in a Toroidal Sector Magnet
We present a Hamiltonian formulation of muon dynamics in toroidal sector
solenoids (bent solenoids)Comment: format aipproc.cls; aipproc.sty; 7 pages, two figures (*.ps).
Submitted to the Proceedings of the 4th International Conference on Physics
Potential and Development of mu-mu Colliders, San Francisco, Dec. 199
A hyperbolic universal operator commuting with a compact operator
A Hilbert space operator is called universal (in the sense of Rota) if every operator on the Hilbert space is similar to a multiple of the restriction of the universal operator to one of its invariant subspaces. We exhibit an analytic Toeplitz operator whose adjoint is universal in the sense of Rota and commutes with a non-trivial, quasinilpotent, injective, compact operator with dense range, but unlike other examples, it acts on the Bergman space instead of the Hardy space and this operator is associated with a `hyperbolic' composition operator
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