1,977 research outputs found
LHC Search of New Higgs Boson via Resonant Di-Higgs Production with Decays into 4W
Searching for new Higgs particle beyond the observed light Higgs boson
h(125GeV) will unambiguously point to new physics beyond the standard model. We
study the resonant production of a CP-even heavy Higgs state in the
di-Higgs channel via, , at the LHC Run-2 and
the high luminosity LHC (HL-LHC). We analyze two types of the decay modes,
one with the same-sign di-leptons () and the
other with tri-leptons (). We
perform a full simulation for the signals and backgrounds, and estimate the
discovery potential of the heavy Higgs state at the LHC Run-2 and the HL-LHC,
in the context of generical two-Higgs-doublet models (2HDM). We determine the
viable parameter space of the 2HDM as allowed by the theoretical constraints
and the current experimental limits. We systematically analyze the allowed
parameter space of the 2HDM which can be effectively probed by the heavy Higgs
searches of the LHC, and further compare this with the viable parameter region
under the current theoretical and experimental bounds.Comment: v3: JHEP published version, 34pp, 10 Figs(36 plots) and 9 Tables.
Only minor typos fixed, references added. v2: JHEP version. All results and
conclusions un-changed, discussions and references added. (This update is
much delayed due to author's traveling and flu.
Magic-angle Twisted Bilayer Systems with Quadratic-Band-Touching: Exactly Flat Bands with High-Chern Number
Studies of twisted morie systems have been mainly focused on 2D materials
like graphene with Dirac points and transition-metal-dichalcogenide so far.
Here we propose a new twisted bilayer of 2D systems which feature
quadratic-band-touching points and find exotic physics different from
previously studied twisted morie systems. Specifically, we show that exactly
flat bands can emerge at magic angles and, more interestingly, each flat band
exhibits a high Chern number () which was not realized in bilayer
morie systems before. We further consider the effect of Coulomb interactions in
such magic-angle twisted system and find that the ground state supports the
quantum anomalous Hall effect with quantized Hall conductivity
at certain filling. Furthermore, possible physical
realization of such twisted bilayer systems will be briefly discussed.Comment: 4.6 pages + references + supplemental, 4 figure
Hidden itinerant-spin phase in heavily-overdoped La2-xSrxCuO4 revealed by dilute Fe doping: A combined neutron scattering and angle-resolved photoemission study
We demonstrated experimentally a direct way to probe a hidden propensity to
the formation of spin density wave (SDW) in a non-magnetic metal with strong
Fermi surface nesting. Substituting Fe for a tiny amount of Cu (1%) induced an
incommensurate magnetic order below 20 K in heavily-overdoped La2-xSrxCuO4
(LSCO). Elastic neutron scattering suggested that this order cannot be ascribed
to the localized spins on Cu or doped Fe. Angle-resolved photoemission
spectroscopy (ARPES), combined with numerical calculations, revealed a strong
Fermi surface nesting inherent in the pristine LSCO that likely drives this
order. The heavily-overdoped Fe-doped LSCO thus represents the first plausible
example of the long-sought "itinerant-spin extreme" of cuprates, where the
spins of itinerant doped holes define the magnetic ordering ground state. This
finding complements the current picture of cuprate spin physics that highlights
the predominant role of localized spins at lower dopings. The demonstrated set
of methods could potentially apply to studying hidden density-wave
instabilities of other "nested" materials on the verge of density wave
ordering.Comment: Abstract and discussion revised; to appear in Phys. Rev. Let
MiChao-HuaFen 1.0: A Specialized Pre-trained Corpus Dataset for Domain-specific Large Models
With the advancement of deep learning technologies, general-purpose large
models such as GPT-4 have demonstrated exceptional capabilities across various
domains. Nevertheless, there remains a demand for high-quality, domain-specific
outputs in areas like healthcare, law, and finance. This paper first evaluates
the existing large models for specialized domains and discusses their
limitations. To cater to the specific needs of certain domains, we introduce
the ``MiChao-HuaFen 1.0'' pre-trained corpus dataset, tailored for the news and
governmental sectors. The dataset, sourced from publicly available internet
data from 2022, underwent multiple rounds of cleansing and processing to ensure
high quality and reliable origins, with provisions for consistent and stable
updates. This dataset not only supports the pre-training of large models for
Chinese vertical domains but also aids in propelling deep learning research and
applications in related fields.Comment: 4 pages,2 figure
Igniting Language Intelligence: The Hitchhiker's Guide From Chain-of-Thought Reasoning to Language Agents
Large language models (LLMs) have dramatically enhanced the field of language
intelligence, as demonstrably evidenced by their formidable empirical
performance across a spectrum of complex reasoning tasks. Additionally,
theoretical proofs have illuminated their emergent reasoning capabilities,
providing a compelling showcase of their advanced cognitive abilities in
linguistic contexts. Critical to their remarkable efficacy in handling complex
reasoning tasks, LLMs leverage the intriguing chain-of-thought (CoT) reasoning
techniques, obliging them to formulate intermediate steps en route to deriving
an answer. The CoT reasoning approach has not only exhibited proficiency in
amplifying reasoning performance but also in enhancing interpretability,
controllability, and flexibility. In light of these merits, recent research
endeavors have extended CoT reasoning methodologies to nurture the development
of autonomous language agents, which adeptly adhere to language instructions
and execute actions within varied environments. This survey paper orchestrates
a thorough discourse, penetrating vital research dimensions, encompassing: (i)
the foundational mechanics of CoT techniques, with a focus on elucidating the
circumstances and justification behind its efficacy; (ii) the paradigm shift in
CoT; and (iii) the burgeoning of language agents fortified by CoT approaches.
Prospective research avenues envelop explorations into generalization,
efficiency, customization, scaling, and safety. This paper caters to a wide
audience, including beginners seeking comprehensive knowledge of CoT reasoning
and language agents, as well as experienced researchers interested in
foundational mechanics and engaging in cutting-edge discussions on these
topics. A repository for the related papers is available at
https://github.com/Zoeyyao27/CoT-Igniting-Agent
Electronic Structures of Graphene Layers on Metal Foil: Effect of Point Defects
Here we report a facile method to generate a high density of point defects in
graphene on metal foil and show how the point defects affect the electronic
structures of graphene layers. Our scanning tunneling microscopy (STM)
measurements, complemented by first principle calculations, reveal that the
point defects result in both the intervalley and intravalley scattering of
graphene. The Fermi velocity is reduced in the vicinity area of the defect due
to the enhanced scattering. Additionally, our analysis further points out that
periodic point defects can tailor the electronic properties of graphene by
introducing a significant bandgap, which opens an avenue towards all-graphene
electronics.Comment: 4 figure
The Glauber model and flow analysis with Pb-Pb collisions at =2.76 TeV
This work presents data analysis on Pb-Pb collisions at =2.76 TeV with centrality . We present introduction and
Monte-Carlo simulation results of the Glauber model, which shed light on the
initial geometric configuration of heavy ion collisions. Three-dimensional
correlation function is plotted, and Fourier decomposition is carried out in
order to obtain elliptic flow. Based on the assumption that non-flow effect is
less prominent in long-range area, we separate it from the second Fourier
decomposition of two-particle correlation function by making polynomial curve
fitting.Comment: 10 pages,8 figures, revisions are made, accepted by ICAPM 2022
Conference Proceeding
Investigating and exotic states in decays
We study the and exotic states in the decays of
baryons through a molecular scenario. In the final state
interaction, the decays are followed by the
to rescatterings via exchange of a
meson. We predict a branching fraction of
for , which can be measured in the decay. This study provides insights into the nature of exotic
hadrons and their production mechanisms, and guides future experimental
searches for the and .Comment: 11 pages, 3 figure
Learning Enhanced Resolution-wise features for Human Pose Estimation
Recently, multi-resolution networks (such as Hourglass, CPN, HRNet, etc.)
have achieved significant performance on pose estimation by combining feature
maps of various resolutions. In this paper, we propose a Resolution-wise
Attention Module (RAM) and Gradual Pyramid Refinement (GPR), to learn enhanced
resolution-wise feature maps for precise pose estimation. Specifically, RAM
learns a group of weights to represent the different importance of feature maps
across resolutions, and the GPR gradually merges every two feature maps from
low to high resolutions to regress final human keypoint heatmaps. With the
enhanced resolution-wise features learnt by CNN, we obtain more accurate human
keypoint locations. The efficacies of our proposed methods are demonstrated on
MS-COCO dataset, achieving state-of-the-art performance with average precision
of 77.7 on COCO val2017 set and 77.0 on test-dev2017 set without using extra
human keypoint training dataset.Comment: Published on ICIP 202
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