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The design of a liquid lithium lens for a muon collider
The last stage of ionization cooling for the muon collider requires a multistage liquid lithium lens. This system uses a large ({approximately}0.5 MA) pulsed current through liquid lithium to focus the beam while energy loss in the lithium removes momentum which is replaced by linacs. The beam optics are designed to maximize the 6 dimensional transmission from one lens to the next while minimizing emittance growth. The mechanical design of the lithium vessel is constrained by a pressure pulse due to the sudden ohmic heating, and the stress on the Be window. The authors describe beam optics, the liquid lithium pressure vessel, pumping, power supplies, as well as the overall optimization of the system
The Case for a Muon Collider Higgs Factory
We propose the construction of a compact Muon Collider Higgs Factory. Such a
machine can produce up to \sim 14,000 at 8\times 10^{31} cm^-2 sec^-1 clean
Higgs events per year, enabling the most precise possible measurement of the
mass, width and Higgs-Yukawa coupling constants.Comment: Supporting letter for the document: "Muon Collider Higgs Factory for
Smowmass 2013", A White Paper submitted to the 2013 U.S. Community Summer
Study of the Division of Particles and Fields of the American Physical
Society, Y. Alexahin, et. al, FERMILAB-CONF-13-245-T (July, 2013
Status of Muon Collider Research and Development and Future Plans
The status of the research on muon colliders is discussed and plans are
outlined for future theoretical and experimental studies. Besides continued
work on the parameters of a 3-4 and 0.5 TeV center-of-mass (CoM) energy
collider, many studies are now concentrating on a machine near 0.1 TeV (CoM)
that could be a factory for the s-channel production of Higgs particles. We
discuss the research on the various components in such muon colliders, starting
from the proton accelerator needed to generate pions from a heavy-Z target and
proceeding through the phase rotation and decay ()
channel, muon cooling, acceleration, storage in a collider ring and the
collider detector. We also present theoretical and experimental R & D plans for
the next several years that should lead to a better understanding of the design
and feasibility issues for all of the components. This report is an update of
the progress on the R & D since the Feasibility Study of Muon Colliders
presented at the Snowmass'96 Workshop [R. B. Palmer, A. Sessler and A.
Tollestrup, Proceedings of the 1996 DPF/DPB Summer Study on High-Energy Physics
(Stanford Linear Accelerator Center, Menlo Park, CA, 1997)].Comment: 95 pages, 75 figures. Submitted to Physical Review Special Topics,
Accelerators and Beam
Neutral Higgs CP Violation at colliders
CP violating asymmetries in both the production and the decays of -channel
neutral Higgs bosons at colliders can be large. If the CP
violation occurs in the muon-Higgs coupling, one observes a production
asymmetry with transversely polarized beams. Likewise if the CP
violation occurs in the top-Higgs or -Higgs coupling, one observes an
azimuthal decay asymmetry in (or ). CP
studies at such colliders allow a uniquely clean way of deducing the underlying
CP phases; in turn these parameters would significantly improve our
understanding of baryogenesis.Comment: 14 pages, 4 Figures, LaTeX fil
Phenomenology of Two Higgs Doublet Models with Flavor Changing Neutral Currents
A comprehensive phenomenological analysis of a two Higgs doublet model, with
flavor changing scalar currents at the tree level, called model III, is
presented. Constraints from existing experimental information especially on
(Delta F)=2 processes are systematically incorporated. Constraints emerging
from rare B-decays, Z-->b\bar b, and the \rho parameter are also examined.
Experimental implications for e^+e^- (\mu^+\mu^-)-->t\bar c+\bar t c,
t-->c\gamma(Z,g), D^0-\bar D^0, and B^0_s-\bar B^0_s oscillations, and for
e^+e^-(Z)-->b\bar s+s\bar b are investigated and experimental effort towards
these is stressed. We also emphasize the importance of clarifying the
experimental issues pertaining to Z-->b\bar b.Comment: 32 pages, 11 Postscript figures, 14 Postscript files, uses revtex and
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