561 research outputs found
LHC searches for heavy neutral Higgs bosons with a top jet substructure analysis
We study the LHC searches for the heavy -odd Higgs boson and
-even Higgs boson in the context of general two-Higgs-doublet model.
Specifically, we consider the decay mode of through the or associated production channels. In the so-called
"alignment limit" of the two-Higgs-doublet model, this decay mode can be the
most dominant one. By employing the HEPTopTagger and the
multi-variable-analysis method, we present the search sensitivities for both
-odd Higgs boson and -even Higgs boson via these channels at
the high-luminosity LHC runs.Comment: 21 pages, 5 figures; v2: matches the published versio
Simplified Supersymmetry with Sneutrino LSP at 8 TeV LHC
The current searches of supersymmetry (SUSY) are based on the neutralino
lightest sparticle (LSP). In this article we instead focus on SUSY with
sneutrino LSP. It is well motivated in many contexts, especially in which
sneutrino services as a dark matter candidate. We first develop a simplified
model, which contains the stop, chagino/neutralino and sneutrino, to describe
the LHC phenomenologies of a large class of models with sneutrino LSP. Then we
investigate bounds on the model using the SUSY searches at the 8 TeV LHC.
Strong exclusion limits are derived, e.g., masses of stop and chargino can be
excluded up to about 900 GeV and 550 GeV, respectively. We also propose
optimizations for some searches without turning to higher energy and
luminosity.Comment: 26 pages, 8 figures,Minor corrections,References adde
LHC searches for the CP-odd Higgs by the jet substructure analysis
The LHC searches for the CP-odd Higgs boson is studied (with masses from 300
GeV to 1 TeV) in the context of the general two-Higgs-doublet model. With the
discovery of the 125 GeV Higgs boson at the LHC, we highlight one promising
discovery channel of the hZ. This channel can become significant after the
global signal fitting to the 125 GeV Higgs boson in the general
two-Higgs-doublet model. It is particularly important in the scenario where two
CP-even Higgs bosons in the two-Higgs-doublet model have the common mass of 125
GeV. Since the final states involve a Standard-Model-like Higgs boson, we apply
the jet substructure analysis of the fat Higgs jet in order to eliminate the
Standard Model background sufficiently. After performing the kinematic cuts, we
present the LHC search sensitivities for the CP-odd Higgs boson with mass up to
1 TeV via this channel.Comment: 26 pages, 12 figures, submitted to Phys. Rev.
VQS: Linking Segmentations to Questions and Answers for Supervised Attention in VQA and Question-Focused Semantic Segmentation
Rich and dense human labeled datasets are among the main enabling factors for
the recent advance on vision-language understanding. Many seemingly distant
annotations (e.g., semantic segmentation and visual question answering (VQA))
are inherently connected in that they reveal different levels and perspectives
of human understandings about the same visual scenes --- and even the same set
of images (e.g., of COCO). The popularity of COCO correlates those annotations
and tasks. Explicitly linking them up may significantly benefit both individual
tasks and the unified vision and language modeling. We present the preliminary
work of linking the instance segmentations provided by COCO to the questions
and answers (QAs) in the VQA dataset, and name the collected links visual
questions and segmentation answers (VQS). They transfer human supervision
between the previously separate tasks, offer more effective leverage to
existing problems, and also open the door for new research problems and models.
We study two applications of the VQS data in this paper: supervised attention
for VQA and a novel question-focused semantic segmentation task. For the
former, we obtain state-of-the-art results on the VQA real multiple-choice task
by simply augmenting the multilayer perceptrons with some attention features
that are learned using the segmentation-QA links as explicit supervision. To
put the latter in perspective, we study two plausible methods and compare them
to an oracle method assuming that the instance segmentations are given at the
test stage.Comment: To appear on ICCV 201
Light Doubly Charged Higgs Boson via the Channel at LHC
The doubly charged Higgs bosons searches at the Large Hadron
Collider (LHC) have been studied extensively and strong bound is available for
dominantly decaying into a pair of same-sign di-leptons. In this
paper we point out that there is a large cavity in the light mass
region left unexcluded. In particular, can dominantly decay into
or (For instance, in the type-II seesaw mechanism the triplet
acquires a vacuum expectation value around 1 GeV.), and then it is found that
with mass even below remains untouched by the current
collider searches. Searching for such a at the LHC is the topic of
this paper. We perform detailed signal and background simulation, especially
including the non-prompt background which is the dominant one
nevertheless ignored before. We show that such should be
observable at the 14 TeV LHC with 10-30 fb integrated luminosity.Comment: 23 pages, 4 figures, typos fixed, references added, EPJC versio
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