8,208 research outputs found
Fermion-boson loops with bilinear R-parity violation leading to Majorana neutrino mass and magnetic moments
We present analytic expressions corresponding to a set of one loop Feynman
diagrams, built within R-parity violating (RpV) minimal supersymmetric standard
model (MSSM). Diagrams involve both bilinear and trilinear RpV couplings and
represent Majorana neutrino masses and magnetic moments.Comment: I've decided to move the collection of my papers to arXiv for easier
access. Proceedings of the Nuclear Physics Workshop in Kazimierz Dolny,
Poland, 200
The Higgs mass in the MSSM infrared fixed point scenario
In the infrared fixed point (IFP) scenario of the minimal supersymmetric
model (MSSM), the top-quark mass and other physical quantities of the
low-energy theory are insensitive to the values of the parameters of the theory
at some high energy scale. In this framework we evaluate the light CP-even
Higgs mass, , taking into account some important effects that had not been
previously considered. In particular, the supersymmetric correction to the
relation between the running and the physical top-quark masses lowers the value
of , thereby implying a lower predicted value of . Assuming a
supersymmetric threshold of TeV and GeV, we find an upper
bound of GeV; the most plausible value of lies somewhat
below the upper bound. This places the Higgs boson in the IFP scenario well
within the reach of the LEP-2 Higgs search.Comment: 18 pages, LaTeX, 5 ps figures, uses psfig.sty. Final version, some
comments and a figure added, references correcte
Relativistic Quantum Thermodynamics of Ideal Gases in 2 Dimensions
In this work we study the behavior of relativistic ideal Bose and Fermi gases
in two space dimensions. Making use of polylogarithm functions we derive a
closed and unified expression for their densities. It is shown that both type
of gases are essentially inequivalent, and only in the non-relativistic limit
the spinless and equal mass Bose and Fermi gases are equivalent as known in the
literature.Comment: 6 pages, 1 figur
Radiative Corrections to the Vertex and Constraints on Extended Higgs Sectors
We explore the radiative corrections to the process in
models with extended Higgs sectors. The observables and the coupling asymmetry, , are sensitive to these corrections. We
present general formulae for the one-loop corrections to and in an
arbitrary extended Higgs sector, and derive explicit results for a number of
specific models. We find that in models containing only doublets, singlets, or
larger multiplets constrained by a custodial symmetry so that at tree level, the one-loop corrections due to virtual
charged Higgs bosons always worsen agreement with experiment. The
measurement can be used to set lower bounds on the charged Higgs masses.
Constraints on models due to the one-loop contributions of neutral Higgs bosons
are also examined.Comment: 54 pages, 11 figure
Complete High Temperature Expansions for One-Loop Finite Temperature Effects
We develop exact, simple closed form expressions for partition functions
associated with relativistic bosons and fermions in odd spatial dimensions.
These expressions, valid at high temperature, include the effects of a
non-trivial Polyakov loop and generalize well-known high temperature
expansions. The key technical point is the proof of a set of Bessel function
identities which resum low temperature expansions into high temperature
expansions. The complete expressions for these partition functions can be used
to obtain one-loop finite temperature contributions to effective potentials,
and thus free energies and pressures.Comment: 9 pages, RevTeX, no figures. To be published in Phys. Rev D. v2 has
revised introduction and conclusions, plus a few typographical errors are
corrected; v3 corrects one typ
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