19,268 research outputs found
A Twisted Custodial Symmetry in the Two-Higgs-Doublet Model
In the Standard Model for electroweak interactions, the Higgs sector is known
to display a "custodial" symmetry protecting the mass relation
m_{W^\pm}^2=m_{W_3}^2 from large corrections. When considering extensions of
the scalar sector, this symmetry has to be introduced by hand in order to pass
current electroweak precision tests in a natural way. In this Letter we
implement a generalized custodial symmetry in the two-Higgs-doublet model.
Assuming the invariance of the potential under CP transformations, we prove the
existence of a new custodial scenario characterized by m_{H^\pm}^2=m_{H^0}^2
instead of m_{H^\pm}^2=m_{A^0}^2. Consequently the pseudoscalar A^0 may be much
lighter than the charged H^\pm, giving rise to interesting phenomenology.Comment: 4 pages, RevTeX
Near infrared star counts as a test of Galactic bar structure
We present survey data in the narrow-band L filter (nbL), taken at UKIRT, for
a total area of 277 square arcmin, roughly equally divided between four regions
at zero Galactic latitude and longitudes +-4.3 deg and +-2.3 deg. The 80%
completeness level for these observations is at roughly magnitude 11.0. This
magnitude limit, owing to the low coefficient for interstellar extinction at
this wavelength (A(nbL)=0.047 A(V)), allows us to observe bulge giants. We
match the nbL-magnitudes with DENIS survey K magnitudes, and find 95 per cent
of nbL sources are matched to K sources. Constructing colour-magnitude
diagrams, we deredden the magnitudes and find evidence for a longitude
dependent asymmetry in the source counts. We find that there are ~15% and ~5%
more sources at the negative longitude than at the corresponding positive
longitude, for the fields at +-4.3 deg and +-2.3 deg respectively. This is
compared with the predictions of some Galactic bar models. We find an asymmetry
in the expected sense, which favours gas dynamical models and the recent
deconvolution of surface photometry data (Binney et al. 1991; Binney, Gerhard &
Spergel 1997), over earlier treatments of photometric data (e.g. Dwek et al.
1995).Comment: 10 pages, Latex, MNRAS accepte
Public policy and life insurance
Public policy ; Life insurance companies ; Insurance industry
Counselors\u27 Social Class and Socioeconomic Status Understanding and Awareness
Nine licensed professional counselors participated in semi-structured interviews designed to reveal their awareness and understanding about social class and socioeconomic status (SES). Findings suggest that participants\u27 descriptions of social class and SES often are in-congruent with how they use the terms, and their awareness and understanding may be limited because of developmental factors, indicating potential clinical liabilities. The authors suggest that counselors should develop stronger social class consciousness to provide affirming counseling services and that further research on such strategies is needed
The observable light deflection angle
The physical deflection angle of a light ray propagating in a space-time
supplied with an asymptotically flat metric has to be expressed in terms of the
impact parameter.Comment: 11 pages, 1 figur
Priorities for Microgravity Combustion Research and Goals for Workshop Discussions
Several concerns motivate fundamental research: combustion-generated pollutants are re-emerging as a major problem, new combustion technologies are needed for effective energy utilization, municipal and hazardous waste incineration are needed to replace landfills and storage, new combustion technologies are needed for advanced aircraft and spacecraft propulsion systems, and current understanding of fires and explosion hazards is limited - particularly for space-craft environments. Thus, it is of interest to determine how experimentation using microgravity facilities can advance research relevant to these problems
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