175 research outputs found
Mass of the lightest Higgs Boson in Supersymmetric Left-Right Models
We consider the lightest Higgs boson in naturally R-parity conserving
supersymmetric left-right models. We obtain an upper bound on the tree level
mass of this lightest Higgs boson. This upper bound depends on the
and gauge couplings, and the vacuum expectation values of bidoublet
Higgs fields, which are needed to break . The upper bound
does not depend on either the breaking scale or the supersymmetry
breaking scale. We evaluate the bound numerically by assuming that the theory
remains perturbative upto some scale . We find that the bound can be
considerably larger than in MSSM. The dominant radiative corrections to the
upper bound due to top-stop and bottom-sbottom systems are of the same form as
in the minimal supersymmetric standard model.Comment: 14 pages including 2 figures, LaTe
Phenomenology of SUSY-models with spontaneously broken R-parity
We review the consequences of spontaneously broken R-parity in present and
planned lepton-lepton colliders. In the left-right models the R-parity,
, is preserved due to the gauge symmetry, but it must be
spontaneously broken in order to the scalar spectrum to be physically
consistent. The spontaneous breaking is generated via a non-vanishing VEV of at
least one of the sneutrinos, which necessarily means non-conservation of lepton
number . The R-parity violating couplings are parametrized in terms of
mixing angles, whose values depend on model parameters. Combined with the
constraints derived from low-energy measurements this yields allowed ranges for
various R-parity breaking couplings. The R-parity breaking allows for the
processes in which a single chargino or neutralino is produced, subsequently
decaying at the interaction point to non-supersymmetric particles.Comment: 6 pages, Latex, talk given in Beyond the Standard Model V in Balholm,
Norwa
Multiple Hypothesis Testing in Pattern Discovery
The problem of multiple hypothesis testing arises when there are more than
one hypothesis to be tested simultaneously for statistical significance. This
is a very common situation in many data mining applications. For instance,
assessing simultaneously the significance of all frequent itemsets of a single
dataset entails a host of hypothesis, one for each itemset. A multiple
hypothesis testing method is needed to control the number of false positives
(Type I error). Our contribution in this paper is to extend the multiple
hypothesis framework to be used with a generic data mining algorithm. We
provide a method that provably controls the family-wise error rate (FWER, the
probability of at least one false positive) in the strong sense. We evaluate
the performance of our solution on both real and generated data. The results
show that our method controls the FWER while maintaining the power of the test.Comment: 28 page
Subjectively Interesting Subgroup Discovery on Real-valued Targets
Deriving insights from high-dimensional data is one of the core problems in
data mining. The difficulty mainly stems from the fact that there are
exponentially many variable combinations to potentially consider, and there are
infinitely many if we consider weighted combinations, even for linear
combinations. Hence, an obvious question is whether we can automate the search
for interesting patterns and visualizations. In this paper, we consider the
setting where a user wants to learn as efficiently as possible about
real-valued attributes. For example, to understand the distribution of crime
rates in different geographic areas in terms of other (numerical, ordinal
and/or categorical) variables that describe the areas. We introduce a method to
find subgroups in the data that are maximally informative (in the formal
Information Theoretic sense) with respect to a single or set of real-valued
target attributes. The subgroup descriptions are in terms of a succinct set of
arbitrarily-typed other attributes. The approach is based on the Subjective
Interestingness framework FORSIED to enable the use of prior knowledge when
finding most informative non-redundant patterns, and hence the method also
supports iterative data mining.Comment: 12 pages, 10 figures, 2 tables, conference submissio
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