University of Helsinki

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19922026

researchers with a paper here

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Showing 1998Show all

78 papers · 1 filter

quant-ph1998★ 3 cited

Coherence properties of the stochastic oscillator

Martti Havukainen, Stig Stenholm

An oscillator with stochastic frequency is discussed as a model for evaluating the quantum coherence properties of a physical system. It is found that the choice of jump statistics…

nucl-th1998★ 12 cited

Test of final state approximations using threshold $pp \to pp π^{0}$

J. A. Niskanen

The Watson-Migdal approximation scheme to take into account final state interactions is shown to give the actual threshold momentum dependence of the reaction $pp \to pp π^{0}$ . Howev…

hep-ph1998★ 19 cited

$b \to ss d ˉ$ Decay in Two Higgs Doublet Models

Katri Huitu, Cai-Dian Lü, Paul Singer +1

In the Standard Model, the box-diagram mediated decay $b \to ss d ˉ$ is predicted to occur with an extremely small branching ratio of below $1 0^{- 11}$ , thus providing a safe tes…

cs.CL1998★ 8 cited

Optimal Multi-Paragraph Text Segmentation by Dynamic Programming

Oskari Heinonen

There exist several methods of calculating a similarity curve, or a sequence of similarity values, representing the lexical cohesion of successive text constituents, e.g., paragrap…

hep-ph1998★ 57 cited

Running of Soft Parameters in Extra Space-Time Dimensions

Tatsuo Kobayashi, Jisuke Kubo, Myriam Mondragon +1

The evolution of the parameters including those in the soft supersymmetry-breaking (SSB) sector is studied in the minimal supersymmetric standard model (MSSM) with a certain set of…

hep-th1998★ 5 cited

Quantum Field Theory on Noncommutative Space-Times and the Persistence of Ultraviolet Divergences

M. Chaichian, A. Demichev, P. Presnajder

We study properties of a scalar quantum field theory on two-dimensional noncommutative space-times. Contrary to the common belief that noncommutativity of space-time would be a key…