19,775 research outputs found
Higgs characterisation at NLO in QCD: CP properties of the top-quark Yukawa interaction
At the LHC the CP properties of the top-quark Yukawa interaction can be
probed through Higgs production in gluon fusion or in association with top
quarks. We consider the possibility for both CP-even and CP-odd couplings to
the top quark to be present, and study CP-sensitive observables at
next-to-leading order (NLO) in QCD, including parton-shower effects. We show
that the inclusion of NLO corrections sizeably reduces the theoretical
uncertainties, and confirm that di-jet correlations in jet production
through gluon fusion and correlations of the top-quark decay products in production can provide sensitive probes of the CP nature of the Higgs
interactions.Comment: 18 pages, 9 figures, 12 tables; v2: references added, version to
appear in EPJ
Part-to-whole Registration of Histology and MRI using Shape Elements
Image registration between histology and magnetic resonance imaging (MRI) is
a challenging task due to differences in structural content and contrast. Too
thick and wide specimens cannot be processed all at once and must be cut into
smaller pieces. This dramatically increases the complexity of the problem,
since each piece should be individually and manually pre-aligned. To the best
of our knowledge, no automatic method can reliably locate such piece of tissue
within its respective whole in the MRI slice, and align it without any prior
information. We propose here a novel automatic approach to the joint problem of
multimodal registration between histology and MRI, when only a fraction of
tissue is available from histology. The approach relies on the representation
of images using their level lines so as to reach contrast invariance. Shape
elements obtained via the extraction of bitangents are encoded in a
projective-invariant manner, which permits the identification of common pieces
of curves between two images. We evaluated the approach on human brain
histology and compared resulting alignments against manually annotated ground
truths. Considering the complexity of the brain folding patterns, preliminary
results are promising and suggest the use of characteristic and meaningful
shape elements for improved robustness and efficiency.Comment: Paper accepted at ICCV Workshop (Bio-Image Computing
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