12,349 research outputs found
Building Block and Building Rule: Dual Descriptor Method for Biological Sequence Analysis
The emergence of “Systems Biology” in recent years highlights the systematic viewpoint of bio-system modeling. Building on such a background, Dual Descriptor Method, a generic methodology for biological sequence analysis is proposed. From a systematic perspective, Dual Descriptor is defined as a two element set of Composition Weight Map and Position Weight Function which aim at reflecting the composition and permutation information of a sequence. An alternate training algorithm is provided to get an optimum description of the building patterns of the sequences. In this paper, dual descriptor method has been applied to the analysis of two typical problems of molecular biology: gene identification and the prediction of protein function. Satisfactory and insightful results are achieved. Owing to the generality of this methodology, dual descriptor method has wide application perspective for many problems of pattern recognition, especially those involved in “Systems Biology”
Parity of Anti-Decuplet Baryons Revisited from Chiral Soliton Models
We recalculate masses and widths of anti-decuplet baryons in the case of
positive parity from chiral soliton models, provided that the member
of the anti-decuplet has a mass 1.86 GeV as reported recently.
Calculations show that there are no convincing candidates for the nonexotic
members of the anti-decuplet available in the baryon listings. Up to the
leading order of and 1/, the width formula for the decay of the
anti-decuplet baryons to the octet depends only on SU(3) symmetry
model-independently, except the coupling constant. Similarly we give a width
formula for the decay of negative parity baryons belong to certain SU(3) baryon
multiplet by pure symmetry consideration. By this formula, we find that if we
have an anti-decuplet with negative parity and that the masses are the same as
those given by chiral soltion models, the identification of N(1650) as
are inconsistent with experiments for while
the widths agree with other two decay channels involving strangeness. And
seems to be a reasonable candidate for .Comment: 4 pages in revtex format, version for journal publication. Arguments
revised, with conclusion unchange
Triplet with a doubly-charged lepton at the LHC
We studied the signatures of an electroweak SU(2) lepton triplet which
contains a doubly charged heavy lepton. The most interesting and easily
detected final states are originating from the doubly charged lepton pair and
single production, that we analyzed at a center of mass energy of 14 TeV. We
propose useful kinematic cuts to reduce the backgrounds and computed the
integrated luminosity needed to discover or exclude the doubly charged leptons
for various masses.Comment: 26 pages, 13 figures. arXiv admin note: text overlap with
arXiv:1105.5417 by other author
Doubly Charged Lepton from an Exotic Doublet at the LHC
We studied the signatures at the LHC of the electroweak SU(2) lepton doublet
which embeds a doubly charged lepton. The doubly charged lepton pair and single
production rates, which are different from the triplet case, are studied and
all the detectable decay modes are considered. We also applied the same
kinematic cuts as in triplet case to reduce the background at LHC and the
needed integrated luminosities to find the doubly charged leptons with
different masses are analyzed. We also suggested a method to distinguish the
exotic lepton doublet and triplet.Comment: 21 pages, 12 figure
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