161,544 research outputs found
Renormalisation of the Fayet-Iliopoulos D-term
We consider the renormalisation of the Fayet-Iliopoulos D-term in a
softly-broken Abelian supersymmetric theory. We show that there exists (at
least through three loops) a renormalisation group invariant trajectory for the
coefficient of the D-term, corresponding to the conformal anomaly solution for
the soft masses and couplings.Comment: 11 pages, TeX, Uses Harvmac (big). References added, minor
corrections (including a sign error for the zeta(3) terms), and discussion of
scheme dependence corrected and amplifie
Two-loop beta-functions and their effects for the R-parity Violating MSSM
We present the full two-loop beta-functions for the MSSM including R-parity
violating couplings. We analyse the effect of two-loop running on the bounds on
R-parity violating couplings, on the nature of the LSP and on the stop masses.Comment: 12 pages, including 2 figures. Plain TeX. Uses Harvmac and epsf.
Revised version with corrected Table and Figure
Gauge singlet renormalisation in softly-broken supersymmetric theories
We consider the renormalisation of a softly-broken supersymmetric theory with
singlet fields and a superpotential with a linear term. We show that there
exist exact beta-functions for both the linear term in the superpotential and
the associated linear term in the Lagrangian. We also construct exact
renormalisation group invariant trajectories for these terms, corresponding to
the conformal anomaly solution for the soft masses and couplings.Comment: 13 pages, Plain TeX, uses Harvmac. Typos corrected and minor
clarification adde
Snowmass Benchmark Points and Three-Loop Running
We present the full three-loop beta-functions for the MSSM generalised to
include additional matter multiplets in 5, 10 representations of SU(5). We
analyse in detail the effect of three-loop running on the sparticle spectrum
for the MSSM Snowmass Benchmark Points. We also consider the effect on these
spectra of additional matter multiplets (the semi-perturbative unification
scenario).Comment: 28 pages, TeX, 4 figures, 10 tables. Uses Harvmac and eps
Comment on "Critical Dynamics of a Vortex-Loop Model for the Superconducting Transition"
Recently, Aji and Goldenfeldt [Phys. Rev. Lett. 87, 197003 (2001),
cond-mat/0105622] put forward an explanation for the value of the dynamic
critical exponent z observed in certain Monte Carlo simulations of the
superconducting phase transition in zero magnetic field. In this Comment, we
point out that their analysis is based on incorrect assumptions regarding the
scaling dimension of the vortex density.Comment: 1 page, no figure
Molecular Dynamics Simulation of CO2-Fluid and CO2-Mineral Interfacial Properties: Application to Subsurface Gas Injection (CCS Projects)
Imperial Users onl
Three loop soft running, benchmark points and semi-perturbative unification
We consider three-loop -function corrections to the sparticle spectrum
in the MSSM, with particular emphasis on Snowmass Benchmark points. The three
loop running has little effect on the weakly interacting particle spectrum, but
for the squark masses the effect can be comparable to, or greater than, that of
two loop running. We extend the analysis to the semi-perturbative unification
scenario, where the impact of the three loop corrections becomes even more
dramatic.Comment: 12 pages, TeX, Uses Harvmac (big) and epsf. Added references (v2).
More emphasis on magnitude of three loop corrections (v3
Yukawa Textures and Anomaly Mediated Supersymmetry Breaking
We present a detailed analysis of how a mixed-anomaly-free U(1) symmetry can
be used to both resolve the slepton mass problem associated with Anomaly
Mediated Supersymmetry Breaking and generate the fermion mass hierarchy via the
Froggatt-Nielsen mechanism. Flavour changing neutral currents problems are
evaded by a specific form of the Yukawa textures.Comment: 33 pages, TeX, Uses Harvmac (big) and epsf. Added references and
minor changes and corrections. Improved texture discussio
The development of freshwater science in Britain, and British contributions abroad, 1900-2000
This article outlines the development of freshwater science between 1900 and 2000 and in particular traces British contributions, both to a deepened knowledge of specifics and to their interrelation as environmental and ecological science. The author provides a selected bibliography of important publications relevant to the topic of the article
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