22,075 research outputs found
Minimum Cycle Base of Graphs Identified by Two Planar Graphs
In this paper, we study the minimum cycle base of the planar graphs obtained
from two 2-connected planar graphs by identifying an edge (or a cycle) of one graph with the corresponding edge (or cycle) of another, related with map geometries, i.e., Smarandache 2-dimensional manifolds
Shortest Co-cycle Bases of Graphs
In this paper we investigate the structure of the shortest co-cycle base(or SCB in short) of connected graphs, which are related with map geometries, i.e., Smarandache 2-dimensional manifolds. By using a Hall type theorem for base transformation, we show that the shortest co-cycle bases have the same structure (there is a 1-1 correspondence between two shortest co-cycle bases such that the corresponding elements have the same length). As an application in surface topology, we show that in an embedded graph on a surface any nonseparating cycle canβt be generated by separating cycles. Based on this result, we show that in a 2-connected graph embedded in a surface, there is a set of surface nonseparating cycles which can span the cycle space. In particular, there is a shortest base consisting surface nonseparating cycle and all such bases have the same structure. This extends a Tutteβs result
Exploiting Decays at the Upgraded Fermilab Tevatron
We study the observability of a Standard Model-like Higgs boson at an
upgraded Fermilab Tevatron via the mode . We concentrate on the
main channel . We also find the mode
useful. We perform
detector level simulations by making use of a Monte Carlo program SHW.
Optimized searching strategy and kinematical cuts are developed. We find that
with a c.m. energy of 2 TeV and an integrated luminosity of 30 fb the
signal should be observable at a 3 level or better for the mass range
of 145 GeV < m_h < 180 GeV. For 95% confidence level exclusion, the mass reach
is 135 GeV < m_h <190 GeV. We also present results of studying these channels
with a model-independent parameterization. Further improvement is possible by
including other channels. We conclude that the upgraded Fermilab Tevatron will
have the potential to significantly advance our knowledge of Higgs boson
physics.Comment: 23 pages; 15 figures; 5 table
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