28,738 research outputs found
PersonRank: Detecting Important People in Images
Always, some individuals in images are more important/attractive than others
in some events such as presentation, basketball game or speech. However, it is
challenging to find important people among all individuals in images directly
based on their spatial or appearance information due to the existence of
diverse variations of pose, action, appearance of persons and various changes
of occasions. We overcome this difficulty by constructing a multiple
Hyper-Interaction Graph to treat each individual in an image as a node and
inferring the most active node referring to interactions estimated by various
types of clews. We model pairwise interactions between persons as the edge
message communicated between nodes, resulting in a bidirectional
pairwise-interaction graph. To enrich the personperson interaction estimation,
we further introduce a unidirectional hyper-interaction graph that models the
consensus of interaction between a focal person and any person in a local
region around. Finally, we modify the PageRank algorithm to infer the
activeness of persons on the multiple Hybrid-Interaction Graph (HIG), the union
of the pairwise-interaction and hyperinteraction graphs, and we call our
algorithm the PersonRank. In order to provide publicable datasets for
evaluation, we have contributed a new dataset called Multi-scene Important
People Image Dataset and gathered a NCAA Basketball Image Dataset from sports
game sequences. We have demonstrated that the proposed PersonRank outperforms
related methods clearly and substantially.Comment: 8 pages, conferenc
Estimating decay rate of while assuming them to be molecular states
Discovery of brings up a tremendous interest because it is very
special, i.e. made of four different flavors. The D0 collaboration claimed that
they observed this resonance through portal , but
unfortunately, later the LHCb, CMS, CDF and ATLAS collaborations' reports
indicate that no such state was found. Almost on the Eve of 2017, the D0
collaboration reconfirmed existence of via the semileptonic decay of
. To further reveal the discrepancy, supposing as a molecular
state, we calculate the decay rate of in an
extended light front model. Numerically, the theoretically predicted decay
width of is MeV which is
consistent with the result of the D0 collaboration
( MeV). Since the
resonance is narrow, signals might be drowned in a messy background. In analog,
two open-charm molecular states and named as and , could
be in the same situation. The rates of and
are estimated as about 30 MeV and 20 MeV respectively. We suggest the
experimental collaborations round the world to search for these two modes and
accurate measurements may provide us with valuable information.Comment: 13 pages and 4 figures, accepted by EPJ
How can escape detection?
Multi-quark states were predicted by Gell-Mann when the quark model was first
formulated. Recently, numerous exotic states that are considered to be
multi-quark states have been experimentally confirmed (four-quark mesons and
five-quark baryons). Theoretical research indicates that the four-quark state
might comprise molecular and/or tetraquark structures. We consider that the
meson containing four different flavors should exist and decay
via the channel. However, except for the D0 collaboration,
all other experimental collaborations have reported negative observations for
in this golden portal. This contradiction has stimulated the interest
of both theorists and experimentalists. To address this discrepancy, we propose
that the assumed is a mixture of a molecular state and tetraquark,
which contributes destructively to . The cancellation may be
accidental and it should be incomplete. In this scenario, there should be two
physical states with the same flavor ingredients, with spectra of
and . lies in the error range of the first state. We
predict the width of the second state (designated as ) as
MeV. We strongly suggest searching for it
in future experiments.Comment: pages 4. Accepted by phys. lett.
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