Publications (101)
Probing Type II Seesaw Leptogenesis Through Lepton Flavor Violation
Chengcheng Han, Yijun Han, Sihui Huang +1
Lepton flavor violation (LFV) offers a powerful probe of physics beyond the Standard Model, particularly in models addressing neutrino masses and the baryon asymmetry of the univer…
Testing type II seesaw leptogenesis at the LHC
Chengcheng Han, Zhanhong Lei, Weihao Liao
Type II seesaw leptogenesis simultaneously explains the origin of neutrino masses, the baryon asymmetry of our universe, and the inflation. The Large Hadron Collider(LHC) provides…
Vacuum stability of the type II seesaw leptogenesis from inflation
Chengcheng Han, Sihui Huang, Zhanhong Lei
Recently it has been found that introducing a triplet Higgs to the standard model could provide a feasible leptogenesis to generate the baryon asymmetry of our universe, providing…
KK graviton resonance and cascade decays in warped gravity
Barry M. Dillon, Chengcheng Han, Hyun Min Lee +1
We consider the Kaluza-Klein (KK) graviton and its decays in the presence of the light radion, the modulus of extra dimension, appearing naturally light due to classical scale inva…
New Physics Search at the CEPC: a General Perspective
Xiaocong Ai, Stefan Antusch, Peter Athron +211
The Circular Electron-Positron Collider (CEPC), a proposed next-generation Higgs factory, provides new opportunities to explore physics beyond the Standard Model (SM). With its cle…
Dirac dark matter in with Stueckelberg mechanism
Chengcheng Han, M. L. López-Ibáñez, Bo Peng +1
We investigate a gauge extension of the Standard Model (SM) where the gauge boson mass is generated by the Stueckelberg mechanism. Three right-handed neutrinos are add…
Vacuum stability in stau-neutralino coannihilation in MSSM
Guang Hua Duan, Chengcheng Han, Bo Peng +2
The stau-neutralino coannihilation provides a feasible way to accommodate the observed cosmological dark matter (DM) relic density in the minimal supersymmetric standard model (MSS…
Quintessence Saves Higgs Instability
Chengcheng Han, Shi Pi, Misao Sasaki
We study a model where quintessence potential coupled to Higgs potential. We calculate the evolution of the quintessence, and track the running of the effective Higgs s…
Type-II Seesaw Leptogenesis along the Ridge
Chengcheng Han, Zhanhong Lei, Jin Min Yang
Type-II seesaw leptogenesis is a model that integrates inflation, baryon number asymmetry, and neutrino mass simultaneously. It employs the Affleck-Dine mechanism to generate lepto…
Identifying a new particle with jet substructures
Chengcheng Han, Doojin Kim, Minho Kim +3
We investigate a potential of measuring properties of a heavy resonance X, exploiting jet substructure techniques. Motivated by heavy higgs boson searches, we focus on the decays o…
The Muon Collider
Carlotta Accettura, Simon Adrian, Rohit Agarwal +450
Muons offer a unique opportunity to build a compact high-energy electroweak collider at the 10 TeV scale. A Muon Collider enables direct access to the underlying simplicity of the…
Exchanging-based Multimodal Fusion with Transformer
Renyu Zhu, Chengcheng Han, Yong Qian +5
We study the problem of multimodal fusion in this paper. Recent exchanging-based methods have been proposed for vision-vision fusion, which aim to exchange embeddings learned from…
Self-interacting dark matter implied by nano-Hertz gravitational waves
Chengcheng Han, Ke-Pan Xie, Jin Min Yang +1
The self-interacting dark matter (SIDM) paradigm offers a potential solution to the small-scale structure problems faced by collision-less cold dark matter. This framework incorpor…
Accessing the core of naturalness, nearly degenerate higgsinos, at the LHC
Chengcheng Han, Doyoun Kim, Shoaib Munir +1
The presence of two light higgsinos nearly degenerate in mass is one of the important characteristics of suspersymmetric models meeting the naturalness criteria. Probing such higgs…
Cosmological Signatures of Neutrino Seesaw Mechanism
Chengcheng Han, Hong-Jian He, Linghao Song +1
The tiny neutrino masses are most naturally explained by seesaw mechanism through singlet right-handed neutrinos, which can further explain the matter-antimatter asymmetry in the U…
Towards a Muon Collider
Carlotta Accettura, Dean Adams, Rohit Agarwal +294
A muon collider would enable the big jump ahead in energy reach that is needed for a fruitful exploration of fundamental interactions. The challenges of producing muon collisions a…
Skill0.5: Joint Skill Internalization and Utilization for Out-of-Distribution Generalization in Agentic Reinforcement Learning
Jiapeng Zhu, Jianxiang Yu, Yibo Zhao +5
Equipping large language models with explicit skills has emerged as a promising paradigm for enabling autonomous agents to solve complex tasks. Agent skills can be inherently divid…
Two-Higgs-doublet model with a color-triplet scalar: a joint explanation for top quark forward-backward asymmetry and Higgs decay to diphoton
Chengcheng Han, Ning Liu, Lei Wu +2
The excess of top quark forward-backward asymmetry () reported by the Tevatron and the enhancement of the Higgs decay to diphoton observed by the LHC may point to a same…
Surviving scenario of stop decays for ATLAS search
Chengcheng Han, Mihoko M. Nojiri, Michihisa Takeuchi +1
Recently ATLAS reported a excess in the stop search with channel. We try to interpret the signal by a light stop pair production in the MSSM. We find…
The diphoton resonance as a gravity mediator of dark matter
Chengcheng Han, Hyun Min Lee, Myeonghun Park +1
We consider the possibility of interpreting the recently reported diphoton excess at 750 GeV as a spin-two massive particle (such as a Kaluza-Klein graviton in warped extra-dimensi…
Muon and Co-annihilating Dark Matter in the MSSM
Peter Cox, Chengcheng Han, Tsutomu T. Yanagida
We demonstrate that the recent measurement of the anomalous magnetic moment of the muon and dark matter can be simultaneously explained within the Minimal Supersymmetric Standard M…
VitaBench: Benchmarking LLM Agents with Versatile Interactive Tasks in Real-world Applications
Wei He, Yueqing Sun, Hongyan Hao +13
As LLM-based agents are increasingly deployed in real-life scenarios, existing benchmarks fail to capture their inherent complexity of handling extensive information, leveraging di…
Probing Non-Thermal Gravitinos Through Large-Scale Structure Observations
Weiyi Deng, Liyuan Guo, Chengcheng Han +1
We investigate the effects of non-thermally produced dark matter on large-scale structure formation, focusing on the gravitino dark matter. Our analysis shows that large-scale stru…
Natural SUSY from SU(5) Orbifold GUT
Chengcheng Han, Fei Wang, Jin Min Yang
We propose a realistic 5D orbifold GUT model that can reduce to natural (or radiative natural) supersymmetry as the low energy effective theory. Supersymmetry as well as gauge symm…
A new approach for detecting compressed bino/wino at the LHC
Chengcheng Han, Lei Wu, Jin Min Yang +2
In some supersymmetric models like split supersymmetry or models with non-universal gaugino mass, bino (LSP) and winos (NLSP) may have rather small mass splitting in order to provi…
SKILL0: In-Context Agentic Reinforcement Learning for Skill Internalization
Zhengxi Lu, Zhiyuan Yao, Jinyang Wu +7
Agent skills, structured packages of procedural knowledge and executable resources that agents dynamically load at inference time, have become a reliable mechanism for augmenting L…
QCD axion dark matter and the cosmic dipole problem
Chengcheng Han
There is increasing evidence suggesting a discrepancy between the cosmic dipole observed in the number count of distant galaxies and the one derived from the cosmic microwave backg…
Heavy Fermion Bound States for Diphoton Excess at 750GeV Collider and Cosmological Constraints
Chengcheng Han, Koji Ichikawa, Shigeki Matsumoto +2
A colored heavy particle with sufficiently small width may form non-relativistic bound states when they are produced at the large hadron collider\,(LHC), and they can annihilate in…
Length Desensitization in Direct Preference Optimization
Wei Liu, Yang Bai, Chengcheng Han +5
Direct Preference Optimization (DPO) is widely utilized in the Reinforcement Learning from Human Feedback (RLHF) phase to align Large Language Models (LLMs) with human preferences,…
Type II Seesaw Leptogenesis
Neil D. Barrie, Chengcheng Han, Hitoshi Murayama
The Type II Seesaw Mechanism provides a minimal framework to explain the neutrino masses involving the introduction of a single triplet Higgs to the Standard Model. However, this s…
Muon g-2 and CP violation in MSSM
Chengcheng Han
We study the constraints of the CP violation in the muon preferred region of the minimal supersymmetric standard model assuming a universal slepton masses within first two ge…
TopoCurate:Modeling Interaction Topology for Tool-Use Agent Training
Jinluan Yang, Yuxin Liu, Zhengyu Chen +7
Training tool-use agents typically relies on outcome-based filtering: Supervised Fine-Tuning (SFT) on successful trajectories and Reinforcement Learning (RL) on pass-rate-selected…
Automated Peer Reviewing in Paper SEA: Standardization, Evaluation, and Analysis
Jianxiang Yu, Zichen Ding, Jiaqi Tan +10
In recent years, the rapid increase in scientific papers has overwhelmed traditional review mechanisms, resulting in varying quality of publications. Although existing methods have…
DialCoT Meets PPO: Decomposing and Exploring Reasoning Paths in Smaller Language Models
Chengcheng Han, Xiaowei Du, Che Zhang +4
Chain-of-Thought (CoT) prompting has proven to be effective in enhancing the reasoning capabilities of Large Language Models (LLMs) with at least 100 billion parameters. However, i…
Hybrid Type-II and Type-III seesaw model for the muon anomaly
Lei Cai, Chengcheng Han, Shi-Ping He +1
In this work we investigate the muon anomalous magnetic dipole moment in a model that extends the Standard Model with a scalar triplet and a lepton triplet. Different from p…
A scalar potential from gauge condensation and its implications
Eung Jin Chun, Chengcheng Han
We consider a scalar field whose coupling to the kinetic term of a non-abelian gauge field is set at an UV scale . Then the confinement of the gauge sector will induce a $Ï…
MuCol Milestone Report No. 7: Consolidated Parameters
Rebecca Taylor, Antoine Chancé, Dario Augusto Giove +459
This document is comprised of a collection of consolidated parameters for the key parts of the muon collider. These consolidated parameters follow on from the October 2024 Prelimin…
LFV and g-2 in non-universal SUSY models with light higgsinos
Chengcheng Han, M. L. López-Ibáñez, Aurora Melis +3
We consider a supersymmetric type-I seesaw framework with non-universal scalar masses at the GUT scale to explain the long-standing discrepancy of the anomalous magnetic moment of…
GUI-CIDER: Mid-training GUI Agents via Causal Internalization and Density-aware Exemplar Reselection
Zheng Wu, Chengcheng Han, Zhengxi Lu +5
Despite the rapid progress of multimodal large language models in building Graphical User Interface (GUI) agents, their real-world task completion is fundamentally bottlenecked by…
MuCol Milestone Report No. 5: Preliminary Parameters
Carlotta Accettura, Simon Adrian, Rohit Agarwal +391
This document is comprised of a collection of updated preliminary parameters for the key parts of the muon collider. The updated preliminary parameters follow on from the October 2…
MUSE: MCTS-Driven Red Teaming Framework for Enhanced Multi-Turn Dialogue Safety in Large Language Models
Siyu Yan, Long Zeng, Xuecheng Wu +6
As large language models~(LLMs) become widely adopted, ensuring their alignment with human values is crucial to prevent jailbreaks where adversaries manipulate models to produce ha…
When Gradient Descent Meets Derivative-Free Optimization: A Match Made in Black-Box Scenario
Chengcheng Han, Liqing Cui, Renyu Zhu +5
Large pre-trained language models (PLMs) have garnered significant attention for their versatility and potential for solving a wide spectrum of natural language processing (NLP) ta…
Affleck-Dine Leptogenesis from Higgs Inflation
Neil D. Barrie, Chengcheng Han, Hitoshi Murayama
We find that the triplet Higgs of the Type II seesaw mechanism can simultaneously generate the neutrino masses and observed baryon asymmetry, while playing a role in inflation. We…
Curvature Perturbations from Higgs Modulated Reheating
Weiyi Deng, Chengcheng Han, Zhanhong Lei +1
In this work we investigate curvature perturbations and non-Gaussianity arising from Higgs modulated reheating in the early Universe. We employ three different methods -- the perio…
SUSY induced top quark FCNC decay after Run I of LHC
Junjie Cao, Chengcheng Han, Lei Wu +2
In light of the Higgs discovery and the nonobservation of sparticles at the LHC, we revisit the SUSY induced top quark flavor changing decay into the Higgs boson. We perform a scan…
Anomaly-free ALP from non-Abelian flavor symmetry
Chengcheng Han, M. L. López-Ibáñez, Aurora Melis +2
Motivated by the Xenon1T excess in electron-recoil measurements, we investigate the prospects of probing axion-like particles (ALP) in lepton flavor violation experiments. In parti…
A light SUSY dark matter after CDMS-II, LUX and LHC Higgs data
Junjie Cao, Chengcheng Han, Lei Wu +2
In SUSY, a light dark matter is usually accompanied by light scalars to achieve the correct relic density, which opens new decay channels of the SM like Higgs boson. Under current…
Introducing LongCat-Flash-Thinking: A Technical Report
Meituan LongCat Team, Anchun Gui, Bei Li +122
We present LongCat-Flash-Thinking, an efficient 560-billion-parameter open-source Mixture-of-Experts (MoE) reasoning model. Its advanced capabilities are cultivated through a metic…
Topological defects as effective dynamical dark energy
Haipeng An, Chengcheng Han, Borui Zhang
In this work, we consider the possibility that the dynamical dark energy hinted at by recent DESI data may be mimicked by the effects of additional components in the universe, pote…
Muon and Dark Matter in the MSSM
Peter Cox, Chengcheng Han, Tsutomu T. Yanagida
We investigate the possibility that both dark matter and the long-standing discrepancy in the anomalous magnetic moment of the muon may be explained within the MSSM. In light of th…
Cosmological Collider Signatures from Right-Handed Neutrino Loop
Jingtao You, Linghao Song, Chengcheng Han +3
We study cosmological collider (CC) signatures generated by right-handed neutrino loops in the setup of inflation combined with the neutrino seesaw mechanism. We formulate the infl…
Probing topcolor-assisted technicolor from top charge asymmetry and triple-top production at the LHC
Chengcheng Han, Ning Liu, Lei Wu +1
In a topcolor-assisted technicolor model (TC2) with large FCNC top quark couplings, we study its correlated contributions to the top quark forward-backward asymmetry () at…
The physics case of a 3 TeV muon collider stage
Jorge De Blas, Dario Buttazzo, Rodolfo Capdevilla +131
In the path towards a muon collider with center of mass energy of 10 TeV or more, a stage at 3 TeV emerges as an appealing option. Reviewing the physics potential of such muon coll…
LHC Search for Right-handed Neutrinos in Models
Peter Cox, Chengcheng Han, Tsutomu T. Yanagida
We consider right-handed neutrino pair production in generic models. We propose a new, model-independent analysis using final states containing a pair of same-sign muons…
Make Prompt-based Black-Box Tuning Colorful: Boosting Model Generalization from Three Orthogonal Perspectives
Qiushi Sun, Chengcheng Han, Nuo Chen +4
Large language models (LLMs) have shown increasing power on various natural language processing (NLP) tasks. However, tuning these models for downstream tasks usually needs exorbit…
Current experimental bounds on stop mass in natural SUSY
Chengcheng Han, Ken-ichi Hikasa, Lei Wu +2
Motivated by the recent progress of direct search for the productions of stop pair and sbottom pair at the LHC, we examine the constraints of the search results on the stop ($\tild…
Programming Knowledge Tracing: A Comprehensive Dataset and A New Model
Renyu Zhu, Dongxiang Zhang, Chengcheng Han +4
In this paper, we study knowledge tracing in the domain of programming education and make two important contributions. First, we harvest and publish so far the most comprehensive d…
Probing the doubly-charged Higgs with Muonium to Antimuonium Conversion Experiment
Chengcheng Han, Da Huang, Jian Tang +1
The spontaneous muonium-to-antimuonium conversion is one of the interesting charged lepton flavor violation processes. MACE is the next generation experiment to probe such a phenom…
Meta-Learning Siamese Network for Few-Shot Text Classification
Chengcheng Han, Yuhe Wang, Yingnan Fu +4
Few-shot learning has been used to tackle the problem of label scarcity in text classification, of which meta-learning based methods have shown to be effective, such as the prototy…
Line-of-sight magnetic-field propagation effects on axion-like particle constraints from GRB 221009A
Chengcheng Han, Zhanhong Lei, Jiajie Yang +1
High-energy photons from GRB 221009A provide a powerful opportunity to probe axion-like particles (ALPs) through photon-ALP oscillations in cosmic magnetic fields. We revisit the A…
Searching for heavy neutrino in terms of tau lepton at future hadron collider
Chengcheng Han, Tong Li, Chang-Yuan Yao
The tau lepton plays important role in the correlation between the low-energy neutrino oscillation data and the lepton flavor structure in heavy neutrino decay. We investigate the…
Learning to Check: Unleashing Potentials for Self-Correction in Large Language Models
Che Zhang, Zhenyang Xiao, Chengcheng Han +2
Self-correction has achieved impressive results in enhancing the style and security of the generated output from large language models (LLMs). However, recent studies suggest that…
(1) GeV dark matter in SUSY and a very light pseudoscalar at the LHC
Chengcheng Han, Doyoun Kim, Shoaib Munir +1
We analyze the prospects of the detection of a GeV neutralino dark matter, , in the Next-to-Minimal Supersymmetric Standard Model at the 14 TeV…
Superhorizon fluctuations and the cosmic dipole problem
Ge Chen, Chengcheng Han, Linwei Qiu
Recent observations have identified a significant 4.9 tension between the cosmic dipole inferred from galaxy number counts and that derived from the Cosmic Microwave Background…
A Survey of Neural Code Intelligence: Paradigms, Advances and Beyond
Qiushi Sun, Zhirui Chen, Fangzhi Xu +15
Neural Code Intelligence -- leveraging deep learning to understand, generate, and optimize code -- holds immense potential for transformative impacts on the whole society. Bridging…
Implications of the 750 GeV Diphoton Excess in Gaugino Mediation
Chengcheng Han, Tsutomu T. Yanagida, Norimi Yokozaki
The 750 GeV diphoton excess reported by ATLAS and CMS indicates the presence of several pairs of the vector-like matter multiplets around TeV scale. If that is the case, radiative…
Apparent unitarity violation in top quark's mass off-shell region from a new physics at high energy colliders
Chengcheng Han, Mihoko M. Nojiri, Myeonghun Park
Perturbative unitarity conditions have been playing an important role by estimating the energy scale of new physics, including the Higgs mass as one of the most important examples.…
MARS2 2025 Challenge on Multimodal Reasoning: Datasets, Methods, Results, Discussion, and Outlook
Peng Xu, Shengwu Xiong, Jiajun Zhang +125
This paper reviews the MARS2 2025 Challenge on Multimodal Reasoning. We aim to bring together different approaches in multimodal machine learning and LLMs via a large benchmark. We…
Probing natural SUSY from stop pair production at the LHC
Junjie Cao, Chengcheng Han, Lei Wu +2
We consider the natural supersymmetry scenario in the framework of the R-parity conserving minimal supersymmetric standard model (called natural MSSM) and examine the observability…
Status of CMSSM in light of current LHC Run-2 and LUX data
Chengcheng Han, Ken-ichi Hikasa, Lei Wu +2
Motivated by the latest results of the LHC Run-2 and LUX experiments, we examine the status of the constrained minimal supersymmetric standard model (CMSSM) by performing a global…
Probing bino NLSP at lepton colliders
Junmou Chen, Chengcheng Han, Jin Min Yang +1
We consider a scenario where light bino is the next-to-lightest supersymmetric particle (NLSP) and gravitino/axino is the lightest superysmmetric particle (LSP). For a bino mass le…
Higgs pair production with SUSY QCD correction: revisited under current experimental constraints
Chengcheng Han, Xuanting Ji, Lei Wu +2
We consider the current experimental constraints on the parameter space of the MSSM and NMSSM. Then in the allowed parameter space we examine the Higgs pair production at the 14 Te…
LongCat-Flash-Thinking-2601 Technical Report
Meituan LongCat Team, Anchun Gui, Bei Li +162
We introduce LongCat-Flash-Thinking-2601, a 560-billion-parameter open-source Mixture-of-Experts (MoE) reasoning model with superior agentic reasoning capability. LongCat-Flash-Thi…
Cosmological Non-Gaussianity from Neutrino Seesaw Mechanism
Jingtao You, Linghao Song, Hong-Jian He +1
The neutrino mass generation via conventional seesaw mechanism is realized at high scales around GeV with natural Yukawa couplings of , making the test of neutrin…
Right-handed Neutrino Dark Matter in a U(1) Extension of the Standard Model
Peter Cox, Chengcheng Han, Tsutomu T. Yanagida
We consider minimal extensions of the Standard Model in which one of the right-handed neutrinos is charged under the new gauge symmetry and plays the role of dark matter. In…
A minimal extension of MSSM in light of the B decay anomaly
Guang Hua Duan, Xiang Fan, Mariana Frank +2
Motivated by the and anomalies from B decays, we extend the minimal supersymmetric model with a non-universal anomaly-free gauge symmetry, coupling no…
Correlation length of the angular mode for an approximate symmetry during inflation
Chengcheng Han
It is known that a light scalar field obtains fluctuations in the de Sitter inflationary background. Such fluctuations could provide an initial condition for baryogenesis through t…
Affleck-Dine Dirac Leptogenesis
Neil D. Barrie, Chengcheng Han
We present a minimal framework that realises successful Dirac Leptogenesis through the Affleck-Dine mechanism. A single right-handed neutrino and a neutrinophillic Higgs doublet ar…
Trail of the Higgs in the primordial spectrum
Jinn-Ouk Gong, Chengcheng Han, Shi Pi
We study the effects of the Higgs directly coupled to the inflaton on the primordial power spectrum. The quadratic coupling between the Higgs and the inflaton stabilizes the Higgs…
Flavoured Local Symmetry and Anomalous Rare Decays
Rodrigo Alonso, Peter Cox, Chengcheng Han +1
We consider a flavoured gauge symmetry under which only the third generation fermions are charged. Such a symmetry can survive at low energies (~TeV) while still allowing for…
Interpreting the 750 GeV diphoton excess by the singlet extension of the Manohar-Wise Model
Junjie Cao, Chengcheng Han, Liangliang Shang +3
The evidence of a new scalar particle from the 750 GeV diphoton excess, and the absence of any other signal of new physics at the LHC so far suggest the existence of new colore…
Constraining Top partner and Naturalness at the LHC and TLEP
Chengcheng Han, Archil Kobakhidze, Ning Liu +2
We investigate indirect constraints on the top partner within the minimal fermionic top partner model. By performing a global fit of the latest Higgs data, measu…
DORA: A Scalable Asynchronous Reinforcement Learning System for Language Model Training
Tianhao Hu, Xiangcheng Liu, Youshao Xiao +21
Reinforcement learning (RL) has become a critical paradigm for LLM post-training, yet the rollout phase -- accounting for 50--80% of total step time -- is bottlenecked by skewed ge…
Probing Light Higgsinos in Natural SUSY from Monojet Signals at the LHC
Chengcheng Han, Archil Kobakhidze, Ning Liu +3
We investigate a strategy to search for light, nearly degenerate higgsinos within the natural MSSM at the LHC. We demonstrate that the higgsino mass range in GeV, wh…
Freeze-in bino dark matter in high scale supersymmetry
Chengcheng Han, Peiwen Wu, Jin Min Yang +1
We explore a scenario of high scale supersymmetry where all supersymmetric particles except gauginos stay at a high energy scale which is much larger than the reheat…
Gaugino Mediation Scenarios for Muon and Dark Matter
Peter Cox, Chengcheng Han, Tsutomu T. Yanagida +1
We explore the possibility that the muon anomaly and the nature of dark matter can be simultaneously explained within the framework of gaugino mediation, focusing on bino-lik…
OS-Copilot: Towards Generalist Computer Agents with Self-Improvement
Zhiyong Wu, Chengcheng Han, Zichen Ding +5
Autonomous interaction with the computer has been a longstanding challenge with great potential, and the recent proliferation of large language models (LLMs) has markedly accelerat…
Right-Handed Neutrino Production by an Axion-like Inflaton: Implications for Leptogenesis
Weiyi Deng, Chengcheng Han, Wuzhou Yin +1
The paper analyzes how a derivative coupling between an axion‑like inflaton and heavy right‑handed neutrinos generates these particles during inflation and preheating, and evaluate…
Meta-Learning Triplet Network with Adaptive Margins for Few-Shot Named Entity Recognition
Chengcheng Han, Renyu Zhu, Jun Kuang +5
Meta-learning methods have been widely used in few-shot named entity recognition (NER), especially prototype-based methods. However, the Other(O) class is difficult to be represent…
Probing light bino and higgsinos at the LHC
Chengcheng Han
Motivated by the naturalness, we study a simplified MSSM scenario where only the bino-like LSP and higgsino-like NLSP are light. We first scan the parameter space of this scenario,…
LongCat-Flash Technical Report
Meituan LongCat Team, Bayan, Bei Li +179
We introduce LongCat-Flash, a 560-billion-parameter Mixture-of-Experts (MoE) language model designed for both computational efficiency and advanced agentic capabilities. Stemming f…
RMoA: Optimizing Mixture-of-Agents through Diversity Maximization and Residual Compensation
Zhentao Xie, Chengcheng Han, Jinxin Shi +4
Although multi-agent systems based on large language models show strong capabilities on multiple tasks, they are still limited by high computational overhead, information loss, and…
Higgsino Dark Matter in a Non-Standard History of the Universe
Chengcheng Han
A light higgsino is strongly favored by the naturalness, while as a dark matter candidate it is usually under-abundant. We consider the higgsino production in a non-standard histor…
Anomaly-free local horizontal symmetry and anomaly-full rare B-decays
Rodrigo Alonso, Peter Cox, Chengcheng Han +1
The largest global symmetry that can be made local in the Standard Model + 3 while being compatible with Pati-Salam unification is . The gauge boson…
SpanProto: A Two-stage Span-based Prototypical Network for Few-shot Named Entity Recognition
Jianing Wang, Chengcheng Han, Chengyu Wang +5
Few-shot Named Entity Recognition (NER) aims to identify named entities with very little annotated data. Previous methods solve this problem based on token-wise classification, whi…
Searching for the light Higgsinos in MSSM at the future e-p colliders
Chengcheng Han, Ruibo Li, Ren-Qi Pan +1
The search of the light Higgsino {in the Minimal Supersymmetric Standard Model (MSSM)} is a crucial test for the criteria of the naturalness in supersymmetry. On the other hand, th…
SUSY effects in Higgs productions at high energy colliders
Junjie Cao, Chengcheng Han, Jie Ren +3
Considering the constraints from collider experiments and dark matter detections, we investigate the SUSY effects in the Higgs productions at an collider w…
A Complete Solution to the Strong CP Problem: a SUSY Extension of the Nelson-Barr Model
Jason Evans, Chengcheng Han, Tsutomu T. Yanagida +1
We present a supersymmetric solution to the strong CP problem based on spontaneous CP violation which simultaneously addresses the affects coming from supersymmetry breaking. The g…
Top-squark in natural SUSY under current LHC run-2 data
Chengcheng Han, Jie Ren, Lei Wu +2
We utilize the recent LHC-13 TeV data to study the lower mass bound on top-squark (stop) in natural supersymmetry. We recast the LHC sparticle inclusive search of $(\ge 1){\rm jets…
A light Higgs scalar in the NMSSM confronted with the latest LHC Higgs data
Junjie Cao, Fangfang Ding, Chengcheng Han +2
In the Next-to-Minimal Supersymemtric Standard Model (NMSSM), one of the neutral Higgs scalars (CP-even or CP-odd) may be lighter than half of the SM-like Higgs boson. In this case…