432,396 research outputs found
Addressing the Multi-Channel Inverse Problem at High Energy Colliders: A Model Independent Approach to the Search for New Physics with Trileptons
We describe a method for interpreting trilepton searches at high energy
colliders in a model-independent fashion and apply it to the recent searches at
the Tevatron. The key step is to recognize that the trilepton signature is
comprised of four experimentally very different channels defined by the number
of tau-leptons in the trilepton state. Contributions from these multiple
channels to the overall experimental sensitivity (cross section times branching
ratio) are model-independent and can be parametrized in terms of relevant new
particle masses. Given the trileptonic branching ratios of a specific model,
these experimentally obtained multichannel sensitivities can be combined to
obtain a cross section measurement that can be used to confront the model with
data. Our model-independent results are more widely applicable than the current
Tevatron trilepton results which are stated exclusively in terms of mSUGRA
parameters of supersymmetry. The technique presented here can be expanded
beyond trilepton searches to the more general "inverse problem" of
experimentally discriminating between competing models that seek to explain new
physics discovered in multiple channels.Comment: 17 pages, 7 figures Changed content cosmetic changes for submission
to JHE
Issues surrounding model consistency and QVT.
This document is intended to outline some of the issues surrounding model consistency in the context of QVT. As far as possible this document is intended to be independent of any particular QVT submission, although we do borrow some terminology from the QVT-Partners submission
Neutrino Oscillations from Supersymmetry without R-parity - Its Implications on the Flavor Structure of the Theory
We discuss here some flavor structure aspects of the complete theory of
supersymmetry without R-parity addressed from the perspective of fitting
neutrino oscillation data based on the recent Super-Kamiokande result. The
single-VEV parametrization of supersymmetry without R-parity is first reviewed,
illustrating some important features not generally appreciated. For the flavor
structure discussions, a naive, flavor model independent, analysis is
presented, from which a few interesting things can be learned.Comment: 1+10 pages latex, no figure; Invited talk at NANP 99 conference,
Dubna (Jun 28 - Jul 3) --- submission for the proceeding
Issues Surrounding Model Consistency and QVT
This document is intended to outline some of the issues surrounding model consistency in the context of QVT. As far as possible this document is intended to be independent of any particular QVT submission, although we do borrow some terminology from the QVT-Partners submission
Improving the Lattice QED Action
Strongly coupled QED is a model whose physics is dominated by short-ranged
effects. In order to assess which features of numerical simulations of the
chiral phase transition are universal and which are not, we have formulated a
quenched version of the model in which photon degrees of freedom are defined on
a lattice of spacing a, but fermions only on a lattice of spacing 2a. The
fermi-photon interaction is then obtained via a blocking procedure, whose
parameters allow a degree of control over the relative importance of short
wavelength modes. Results from a variety of models are presented; the critical
exponents delta and beta governing the transition appear to be independent of
the blocking, or even of whether a gauge-invariant action is used for the
photons.Comment: 3 pages LaTeX submission to Lat' 94 proceedings, 3 PostScript figures
incorporated using macro psfi
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