38,138 research outputs found
Physics of An Ultrahigh-Statistics Charm Experiment
We review the physics goals of an ultrahigh-statistics charm experiment and
place them in the broader context of the community's efforts to study the
Standard Model and to search for physics beyond the Standard Model, and we
point out some of the experimental difficulties which must be overcome if these
goals are to be met.Comment: 9 pages, no figure
Status of MICE
Muon ionization cooling is the only practical method for preparing
high-brilliance beams needed for a neutrino factory or muon collider. The muon
ionization cooling experiment (MICE) under development at the Rutherford
Appleton Laboratory comprises a dedicated beamline to generate a range of input
emittance and momentum, with time-of-flight and Cherenkov detectors to ensure a
pure muon beam. A first measurement of emittance is performed in the upstream
magnetic spectrometer with a scintillating-fiber tracker. A cooling cell will
then follow, alternating energy loss in liquid hydrogen with RF acceleration. A
second spectrometer identical to the first and a particle identification system
will measure the outgoing emittance. Plans for measurements of emittance and
cooling are described.Comment: Poster presented at ICHEP08 Conference, Philadelphia, USA, July 2008.
3 pages, 3 figure
Systematic Power Counting in Cutoff Effective Field Theories for Nucleon-Nucleon Interactions and the Equivalence With PDS
An analytic expression for the phase shifts in nucleon-nucleon
scattering is derived in the context of the Schr\"odinger equation in
configuration space with a short distance cutoff and with a consistent power
counting scheme including pionic effects. The scheme treats the pion mass and
the inverse scattering length over the intrinsic short distance scale as small
parameters. Working at next-to-leading order in this scheme, we show that the
expression obtained is identical to one obtained using the recently introduced
PDS approach which is based on dimensional regularization with a novel
subtraction scheme. This strongly supports the conjecture that the schemes are
equivalent provided one works to the same order in the power counting.Comment: 6 pages; replaced version has corrected typos (We thank Mike Birse
for pointing them out to u
Comment on "The Phenomenology of a Nonstandard Higgs Boson in W_L W_L Scattering"
We show that in Composite Higgs models, the coupling of the Higgs resonance
to a pair of bosons is weaker than the corresponding Standard Model
coupling, provided the Higgs arises from electroweak doublets only. This is
partly due to the effects of the nonlinear realization of the chiral symmetries
at the compositeness scale.Comment: 6 pages, BU-HEP 94-2
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