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Report of the Topical Group on Physics Beyond the Standard Model at Energy Frontier for Snowmass 2021
Tulika Bose, Antonio Boveia, Caterina Doglioni +318
This is the Snowmass2021 Energy Frontier (EF) Beyond the Standard Model (BSM) report. It combines the EF topical group reports of EF08 (Model-specific explorations), EF09 (More gen…
A Theory of Dark Pions
Hsin-Chia Cheng, Lingfeng Li, Ennio Salvioni
We present a complete model of a dark QCD sector with light dark pions, broadly motivated by hidden naturalness arguments. The dark quarks couple to the Standard Model via irreleva…
A More Natural Composite Higgs Model
Hsin-Chia Cheng, Yi Chung
Composite Higgs models provide an attractive solution to the hierarchy problem. However, many realistic models suffer from tuning problems in the Higgs potential. There are often l…
Light Hidden Mesons through the Z Portal
Hsin-Chia Cheng, Lingfeng Li, Ennio Salvioni +1
Confining hidden sectors are an attractive possibility for physics beyond the Standard Model (SM). They are especially motivated by neutral naturalness theories, which reconcile th…
Coscattering/Coannihilation Dark Matter in a Fraternal Twin Higgs Model
Hsin-Chia Cheng, Lingfeng Li, Rui Zheng
Dark matter candidates arise naturally in many models that address the hierarchy problem. In the fraternal twin Higgs model which could explain the absence of the new physics signa…
Singlet Scalar Top Partners from Accidental Supersymmetry
Hsin-Chia Cheng, Lingfeng Li, Ennio Salvioni +1
We present a model wherein the Higgs mass is protected from the quadratic one-loop top quark corrections by scalar particles that are complete singlets under the Standard Model (SM…
Constraining the Compressed Top Squark and Chargino along the W Corridor
Hsin-Chia Cheng, Lingfeng Li, Qin Qin
Studying superpartner production together with a hard initial state radiation (ISR) jet has been a useful strategy for searches of supersymmetry with a compressed spectrum at the L…
Compressed Stop Searches with Two Leptons and Two b-jets
Hsin-Chia Cheng, Christina Gao, Lingfeng Li
In top squark (stop) searches with a compressed spectrum, it is very helpful to consider the stop production recoiling against a hard jet from the initial state radiation to obtain…
Exotic Electroweak Signals in Twin Higgs
Hsin-Chia Cheng, Ennio Salvioni, Yuhsin Tsai
The Twin Higgs model is the preeminent example of a theory of neutral naturalness, where the new particles that alleviate the little hierarchy problem are Standard Model (SM) singl…
AMS-02 Positron Excess and Indirect Detection of Three-body Decaying Dark Matter
Hsin-Chia Cheng, Wei-Chih Huang, Xiaoyuan Huang +3
We consider indirect detection of meta-stable dark matter particles decaying into a stable neutral particle and a pair of standard model fermions. Due to the softer energy spectra…
Second Stop and Sbottom Searches with a Stealth Stop
Hsin-Chia Cheng, Lingfeng Li, Qin Qin
The top squarks (stops) may be the most wanted particles after the Higgs boson discovery. The searches for the lightest stop have put strong constraints on its mass. However, there…
Stop Search in the Compressed Region via Semileptonic Decays
Hsin-Chia Cheng, Christina Gao, Lingfeng Li +1
In supersymmetric extensions of the Standard Model, the superpartners of the top quark (stops) play the crucial role in addressing the naturalness problem. For direct pair-producti…
Exotic Quarks in Twin Higgs Models
Hsin-Chia Cheng, Sunghoon Jung, Ennio Salvioni +1
The Twin Higgs model provides a natural theory for the electroweak symmetry breaking without the need of new particles carrying the standard model gauge charges below a few TeV. In…
Same-Sign Dilepton Excesses and Vector-like Quarks
Chuan-Ren Chen, Hsin-Chia Cheng, Ian Low
Multiple analyses from ATLAS and CMS collaborations, including searches for ttH production, supersymmetric particles and vector-like quarks, observed excesses in the same-sign dile…
Top Seesaw with a Custodial Symmetry, and the 126 GeV Higgs
Hsin-Chia Cheng, Jiayin Gu
The composite Higgs models based on the top seesaw mechanism commonly possess an enhanced approximate chiral symmetry, which is spontaneously broken to produce the Higgs field as t…
Higgs mass from compositeness at a multi-TeV scale
Hsin-Chia Cheng, Bogdan A. Dobrescu, Jiayin Gu
Within composite Higgs models based on the top seesaw mechanism, we show that the Higgs field can arise as the pseudo Nambu-Goldstone boson of the broken U(3)_L chiral symmetry ass…
A Holographic Model of Heavy-light Mesons
Yang Bai, Hsin-Chia Cheng
We construct a holographic model of heavy-light mesons by extending the AdS/QCD to incorporate the behavior of the heavy quark limit. In that limit, the QCD dynamics is governed by…
A Toolkit of the Stop Search via the Chargino Decay
Yang Bai, Hsin-Chia Cheng, Jason Gallicchio +1
The top squark (stop) may dominantly decay to a bottom quark and a chargino if the mass difference between the stop and the lightest neutralino is comparable or less than the top q…
The case for three-body decaying dark matter
Hsin-Chia Cheng, Wei-Chih Huang, Ian Low +1
Fermi-LAT has confirmed the excess in cosmic positron fraction observed by PAMELA, which could be explained by dark matter annihilating or decaying in the center of the galaxy. Mos…
Stop the Top Background of the Stop Search
Yang Bai, Hsin-Chia Cheng, Jason Gallicchio +1
The main background for the supersymmetric stop direct production search comes from Standard Model ttbar events. For the single-lepton search channel, we introduce a few kinematic…
Measuring Invisible Particle Masses Using a Single Short Decay Chain
Hsin-Chia Cheng, Jiayin Gu
We consider the mass measurement at hadron colliders for a decay chain of two steps, which ends with a missing particle. Such a topology appears as a subprocess of signal events of…
SUSY Hidden in the Continuum
Haiying Cai, Hsin-Chia Cheng, Anibal D. Medina +1
We study models where the superpartners of the ordinary particles have continuous spectra rather than being discrete states, which can occur when the supersymmetric standard model…
Simplified Models for LHC New Physics Searches
Daniele Alves, Nima Arkani-Hamed, Sanjay Arora +92
This document proposes a collection of simplified models relevant to the design of new-physics searches at the LHC and the characterization of their results. Both ATLAS and CMS hav…
Identifying Dark Matter Event Topologies at the LHC
Yang Bai, Hsin-Chia Cheng
Assuming dark matter particles can be pair-produced at the LHC from cascade decays of heavy particles, we investigate strategies to identify the event topologies based on the kinem…