473 research outputs found
Uncover Compressed Supersymmetry via Boosted Bosons from the Heavier Stop/Sbottom
A light stop around the weak scale is a hopeful messenger of natural
supersymmetry (SUSY), but it has not shown up at the current stage of LHC. Such
a situation raises the question of the fate of natural SUSY. Actually, a
relatively light stop can easily be hidden in a compressed spectra such as mild
mass degeneracy between stop and neutralino plus top quark. Searching for such
a stop at the LHC is a challenge. On the other hand, in terms of the argument
of natural SUSY, other members in the stop sector, including a heavier stop
and lighter sbottom (both assumed to be
left-handed-like), are also supposed to be relatively light and therefore
searching for them would provide an alternative method to probe natural SUSY
with a compressed spectrum. In this paper we consider quasi-natural SUSY which
tolerates relatively heavy colored partners near the TeV scale, with a
moderately large mass gap between the heavier members and the lightest stop.
Then as companions of and decaying into
generically are well boosted, and they, along with other visible
particles from decay, are a good probe to study compressed SUSY.
We find that the resulting search strategy with boosted bosons can have better
sensitivity than those utilizing multi-leptons.Comment: 19 pages, 6 figures, to appear in EPJ
Minimal Dark Matter in the Local Extension
The minimal gauge group extension to the standard model (SM) by the local
(MBLSM) is well known as the minimal model to understand neutrino
mass origins via the seesaw mechanism, following the gauge principle. This
"small" symmetry also has deep implication to another big thing, dark matter
(DM) stability. We demonstrate it in the framework of minimal dark matter
(MDM), which aims at addressing two basic questions on DM, stability and the
nature of interactions. However, stability and perturbativity may only allow
the fermionic quintuplet. The situation is very different in the MBLSM, which
leaves the subgroup of , the matter parity ,
unbroken; it is able to stabilize all of the weakly-interacting {MDM candidates
} after assigning a proper charge. For the candidates with nonzero
hypercharge, the phenomenological challenge comes from realizing the inelastic
DM scenario thus evading the very strict DM direct detention bounds. We present
two approaches that can slightly split the CP-even and -odd parts of the
neutral components: 1) using the dimension 5 operators, which works for the
spontaneously breaking at very high scale; 2) mixing with {other
fields} having zero hypercharge, which instead works for a low
breaking scale.Comment: 13 pages without figure
Unleashing the potential of prompt engineering in Large Language Models: a comprehensive review
This paper delves into the pivotal role of prompt engineering in unleashing
the capabilities of Large Language Models (LLMs). Prompt engineering is the
process of structuring input text for LLMs and is a technique integral to
optimizing the efficacy of LLMs. This survey elucidates foundational principles
of prompt engineering, such as role-prompting, one-shot, and few-shot
prompting, as well as more advanced methodologies such as the chain-of-thought
and tree-of-thoughts prompting. The paper sheds light on how external
assistance in the form of plugins can assist in this task, and reduce machine
hallucination by retrieving external knowledge. We subsequently delineate
prospective directions in prompt engineering research, emphasizing the need for
a deeper understanding of structures and the role of agents in Artificial
Intelligence-Generated Content (AIGC) tools. We discuss how to assess the
efficacy of prompt methods from different perspectives and using different
methods. Finally, we gather information about the application of prompt
engineering in such fields as education and programming, showing its
transformative potential. This comprehensive survey aims to serve as a friendly
guide for anyone venturing through the big world of LLMs and prompt
engineering
Towards Spatio-temporal Sea Surface Temperature Forecasting via Static and Dynamic Learnable Personalized Graph Convolution Network
Sea surface temperature (SST) is uniquely important to the Earth's atmosphere
since its dynamics are a major force in shaping local and global climate and
profoundly affect our ecosystems. Accurate forecasting of SST brings
significant economic and social implications, for example, better preparation
for extreme weather such as severe droughts or tropical cyclones months ahead.
However, such a task faces unique challenges due to the intrinsic complexity
and uncertainty of ocean systems. Recently, deep learning techniques, such as
graphical neural networks (GNN), have been applied to address this task. Even
though these methods have some success, they frequently have serious drawbacks
when it comes to investigating dynamic spatiotemporal dependencies between
signals. To solve this problem, this paper proposes a novel static and dynamic
learnable personalized graph convolution network (SD-LPGC). Specifically, two
graph learning layers are first constructed to respectively model the stable
long-term and short-term evolutionary patterns hidden in the multivariate SST
signals. Then, a learnable personalized convolution layer is designed to fuse
this information. Our experiments on real SST datasets demonstrate the
state-of-the-art performances of the proposed approach on the forecasting task
Graphene-oxide modified polyvinyl-alcohol as microbial carrier to improve high salt wastewater treatment
This work discussed the preparation and characterization of graphene oxide (GO) modified polyvinyl alcohol (PVA) for bacteria immobilization to enhance the biodegrdation efficiency of saline organic wastewater. GO-PVA material has lamellar structure with higher surface area to support bacterial growth and high salinity tolerance. It significantly stimulated the bacterial population by 1.4 times from 2.07×103 CFU/mL to 5.04×103 CFU/mL, and the microbial structure was also improved for salinity tolerance. Acinetobacter, Pseudomonas and Thermophilic hydrogen bacilli were enriched inside GO-PVA materials for glucose biodegradation. Compared to the CODCr removal efficiency with only PVA as the carrier (52.8%), GO-PVA material had better degradation performance (62.8%). It is proved as a good candidate for bioaugmentation to improve biodegradation efficiency in hypersaline organic wastewater
Lattice study on and X(3872)
Properties of charmonium are investigated in quenched
lattice QCD. The mass of is determined to be 3.80(3) GeV, which is
close to the mass of -wave charmonium and in agreement with
quark model predictions. The transition width of
is also obtained with a value keV. Since the possible
assignment to X(3872) has not been ruled out by experiments, our results help
to clarify the nature of X(3872).Comment: 15 pages, 8 figures. typos, grammatical errors and some references
corrected, redundant discussions deleted, conclusion does not change.
published versio
Non-perturbative renormalization of overlap quark bilinears on 2+1-flavor domain wall fermion configurations
We present renormalization constants of overlap quark bilinear operators on
2+1-flavor domain wall fermion configurations. This setup is being used by the
chiQCD collaboration in calculations of physical quantities such as strangeness
in the nucleon and the strange and charm quark masses. The scale independent
renormalization constant for the axial vector current is computed using the
Ward Identity. The renormalization constants for scalar, pseudoscalar and
vector current are calculated in the RI-MOM scheme. Results in the MS-bar
scheme are also given. The step scaling function of quark masses in the RI-MOM
scheme is computed as well. The analysis uses, in total, six different
ensembles of three sea quarks each on two lattices with sizes 24^3x64 and
32^3x64 at spacings a=(1.73 GeV)^{-1} and (2.28 GeV)^{-1}, respectively.Comment: 26 pages, 17 figures. More discussions on O(4) breaking effects, and
on the perturbative running and a^2p^2 extrapolation of Zs. A subsection for
the calculation of the step scaling function of quark mass is added.
References added. Version to appear in PR
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