6,688 research outputs found
Introducing the Western Wedge
The article looks at the rationale for and potential of planning at the sub-regional scale, particularly in terms of labour and housing markets. This is illustrated by the case of the 'Western Wedge', stretching from central London westwards across the Greater London boundary into the South East region towards Oxford, Basingstoke and Newbury
Optimal Galaxy Distance Estimators
The statistical properties of galaxy distance estimators are studied and a
rigorous framework is developed for identifying and removing the effects of
Malmquist bias due to obsevational selection. The prescription of Schechter
(1980) for defining unbiased distance estimators is extended to more general --
and more realistic -- cases. The derivation of `optimal' unbiased distance
estimators of minimum dispersion, by utilising information from additional --
suitably correlated -- observables, is discussed and the results applied to a
calibrating sample from the Fornax cluster, as used in the Mathewson spiral
galaxy redshift survey. The optimal distance estimator derived from I-band
magnitude, diameter and 21cm line width has an intrinsic scatter which is 25 \%
smaller than that of the Tully-Fisher relation quoted for this calibrating
sample. (Figures are available on request).Comment: Plain Latex, 19 pages, Sussex-AST-93/9-
Topcolor in the LHC Era
Ongoing LHC searches for the standard model Higgs Boson in WW or ZZ decay
modes strongly constrain the top-Higgs state predicted in many models with new
dynamics that preferentially affects top quarks. Such a state couples strongly
to top-quarks, and is therefore produced through gluon fusion at a rate that
can be greatly enhanced relative to the rate for the standard model Higgs
boson. As we discuss in this talk, a top-Higgs state with mass less than 300
GeV is excluded at 95% CL if the associated top-pion has a mass of 150 GeV, and
the constraint is even stronger if the mass of the top-pion state exceeds the
top-quark mass or if the top-pion decay constant is a substantial fraction of
the weak scale. These results have significant implications for theories with
strong top dynamics, such as topcolor-assisted technicolor, top-seesaw models,
and certain Higgsless models
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New Strong Interactons at the Tevatron ?
Recent results from CDF indicate that the inclusive cross section for jets
with GeV is significantly higher than that predicted by QCD. We
describe here a simple flavor-universal variant of the ``coloron" model of Hill
and Parke that can accommodate such a jet excess, and which is not in
contradiction with other experimental data. As such, the model serves as a
useful baseline with which to compare both the data and other models proposed
to describe the jet excess. An interesting theoretical feature of the model is
that if the global chiral symmetries of the quarks remain unbroken in the
confining phase of the coloron interaction, it realizes the possibility that
the ordinary quarks are composite particles.Comment: added contributions to scattering cross-sections; 10
pages, LaTeX, includes 1 figure. Full postscript version at
http://smyrd.bu.edu/htfigs/htfigs.htm
LHC Limits on the Top-Higgs in Models with Strong Top-Quark Dynamics
LHC searches for the standard model Higgs Boson in WW or ZZ decay modes place
strong constraints on the top-Higgs state predicted in many models with new
dynamics preferentially affecting top quarks. Such a state couples strongly to
top-quarks, and is therefore produced through gluon fusion at a rate enhanced
relative to the rate for the standard model Higgs boson. A top-Higgs state with
mass less than 300 GeV is excluded at 95% CL if the associated top-pion has a
mass of 150 GeV, and the constraint is even stronger if the mass of the
top-pion state exceeds the top-quark mass or if the top-pion decay constant is
a substantial fraction of the weak scale. These results have significant
implications for theories with strong top dynamics, such as topcolor-assisted
technicolor, top-seesaw models, and certain Higgsless models.Comment: 9 pages, 6 pdf figures included. Updated with 2011 Lepton-Photon
conference Higgs limits. Order of figures reversed, and conclusion slightly
expanded and clarifie
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