71 citations · 1.1k across the 39 of their papers we have counts for
40 papers
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…
Can a secluded self-interacting dark sector generate detectable gravitational waves?
Song Li, Jin Min Yang, Mengchao Zhang +2
In this work we study the possibility to detect the gravitational waves generated by a secluded self-interacting dark sector. ``Secluded'' means that the dark sector has almost no…
Theoretical bounds on dark Higgs mass in a self-interacting dark matter model with
Song Li, Jin Min Yang, Mengchao Zhang +1
Motivated by the null results of current dark matter searches and the small-scale problems, we study a dark sector charged by a spontaneous broken gauge . To explore the par…
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…
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…
Asymmetric dark matter with a spontaneously broken : self-interaction and gravitational waves
Zien Chen, Kairui Ye, Mengchao Zhang
Motivated by the collisionless cold dark matter small scale structure problem, we propose an asymmetric dark matter model where dark matter particle interact with each other via a…
The Physics potential of the CEPC. Prepared for the US Snowmass Community Planning Exercise (Snowmass 2021)
Huajie Cheng, Wen Han Chiu, Yaquan Fang +20
The Circular Electron Positron Collider (CEPC) is a large-scale collider facility that can serve as a factory of the Higgs, Z, and W bosons and is upgradable to run at the ttbar th…
Electroweak Phase Transition in 2HDM under Higgs, Z-pole, and W precision measurements
Huayang Song, Wei Su, Mengchao Zhang
In this work we revisit the existence of a strong first order electroweak phase transition (SFOEWPT) and recent precision measurement in the Type-I and Type-II 2HDMs. The O(1…
Detecting an axion-like particle with machine learning at the LHC
Jie Ren, Daohan Wang, Lei Wu +2
Axion-like particles (ALPs) appear in various new physics models with spontaneous global symmetry breaking. When the ALP mass is in the range of MeV to GeV, the cosmology and astro…
Flavor Anomalies Accommodated in A Flavor Gauged Two Higgs Doublet Model
Junmou Chen, Qiaoyi Wen, Fanrong Xu +1
The anomaly after Moriond 2021 and from Fermilab Muon g-2 experiment implicate that the lepton flavor universality violation (LFUV) may play a role in t…
Leptophilic Composite Asymmetric Dark Matter and its Detection
Mengchao Zhang
We propose a model which explains the baryon asymmetry of the universe and dark matter relic density at the same time. In this model, dark matter candidate is the dark baryon compo…
Photon-jet events as a probe of axion-like particles at the LHC
Daohan Wang, Lei Wu, Jin Min Yang +1
Axion-like particles (ALPs) are predicted by many extensions of the Standard Model (SM). When ALP mass lies in the range of MeV to GeV, the cosmology and astrophysics will be large…
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…
Strong first order electroweak phase transition in 2HDM confronting future Z & Higgs factories
Wei Su, Anthony G. Williams, Mengchao Zhang
The electroweak phase transition can be made first order by extending the Standard Model (SM) Higgs sector with extra scalars. The same new physics can explain the matter-antimatte…
Hunting for top partner with a new signature at the LHC
Daohan Wang, Lei Wu, Mengchao Zhang
Vector-like top partner plays a central role in many new physics models which attempt to address the hierarchy problem. The top partner is conventionally assumed to decay to a quar…
Demystifying Freeze-In Dark Matter at the LHC
Kyu Jung Bae, Myeonghun Park, Mengchao Zhang
Freeze-in mechanism provides robust dark matter production in the early universe. Due to its feeble interactions, freeze-in dark matter leaves signals at colliders which are often…
Exotic decays of top partners: mind the search gap
Giacomo Cacciapaglia, Thomas Flacke, Myeonghun Park +1
Many standard model extensions, including composite Goldstone Higgs models, predict vector-like fermionic top-partners at the TeV scale. The intensive search programmes by ATLAS an…
Revisiting lepton-specific 2HDM in light of muon g-2 anomaly
Lei Wang, Jin Min Yang, Mengchao Zhang +1
We examine the lepton-specific 2HDM as a solution of muon anomaly under various theoretical and experimental constraints, especially the direct search limits from the LHC and…
Exploring dynamical CP violation induced baryogenesis by gravitational waves and colliders
Fa Peng Huang, Zhuoni Qian, Mengchao Zhang
By assuming a dynamical source of CP violation, the tension between sufficient CP violation for successful electroweak baryogenesis and strong constraints from current electric dip…
Tagging a jet from a dark sector with Jet-substructures at colliders
Myeonghun Park, Mengchao Zhang
The phenomenology of dark sector is complicated if dark sector is charged under a confined hidden gauge group. In such kind of model, a dark parton produced at a high energy collid…
Lepton-portal Dark Matter in Hidden Valley model and the DAMPE recent results
Yi-Lei Tang, Lei Wu, Mengchao Zhang +1
We study the recent cosmic ray excess reported by DAMPE in a Hidden Valley Model with lepton-portal dark matter. We find the electron-portal can account for the excess well…
Uncover Compressed Supersymmetry via Boosted Bosons from the Heavier Stop/Sbottom
Zhaofeng Kang, Jinmian Li, Mengchao Zhang
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…
Examining the origin of dark matter mass at colliders
Minho Kim, Hye-Sung Lee, Myeonghun Park +1
As conventional dark matter scenarios have been probed extensively so far, the physics of a light dark matter charged under a new gauge group (dark gauge group) becomes one of new…
Leptonic mono-top from single stop production at LHC
Guang Hua Duan, Ken-ichi Hikasa, Lei Wu +2
Top squark (stop) can be produced via QCD interaction but also the electroweak interaction at the LHC. In this paper, we investigate the observability of the associated production…