11 research outputs found
Light Charged Higgs Bosons to AW/HW via Top Decay
While current ATLAS and CMS measurements exclude a light charged Higgs
( GeV) for most of the parameter region in the context of the
MSSM scenarios, these bounds are significantly weakened in the Type II 2HDM
once the exotic decay channel into a lighter neutral Higgs, ,
is open. In this study, we examine the possibility of a light charged Higgs
produced in top decay via single top or top pair production, with the
subsequent decay , which can reach a sizable branching
fraction at low once it is kinematically permitted. With a detailed
collider analysis, we obtain exclusion and discovery bounds for the 14 TeV LHC
assuming the existence of a 70 GeV neutral scalar. Assuming and , the
95% exclusion limits on are about 0.2% and
0.03% for single top and top pair production respectively, with an integrated
luminosity of 300 . The discovery reaches are about 3 times
higher. In the context of the Type II 2HDM, discovery is possible at both large
for 155 GeV 165 GeV, and small
over the entire mass range. Exclusion is possible in the entire
versus plane except for charged Higgs masses close to the top
threshold. The exotic decay channel is therefore
complementary to the conventional channel.Comment: 21 pages. arXiv admin note: text overlap with arXiv:1408.411
Probabilistic Modeling of Human Teams to Infer False Beliefs
We develop a probabilistic graphical model (PGM) for artificially intelligent
(AI) agents to infer human beliefs during a simulated urban search and rescue
(USAR) scenario executed in a Minecraft environment with a team of three
players. The PGM approach makes observable states and actions explicit, as well
as beliefs and intentions grounded by evidence about what players see and do
over time. This approach also supports inferring the effect of interventions,
which are vital if AI agents are to assist human teams. The experiment
incorporates manipulations of players' knowledge, and the virtual
Minecraft-based testbed provides access to several streams of information,
including the objects in the players' field of view. The participants are
equipped with a set of marker blocks that can be placed near room entrances to
signal the presence or absence of victims in the rooms to their teammates. In
each team, one of the members is given a different legend for the markers than
the other two, which may mislead them about the state of the rooms; that is,
they will hold a false belief. We extend previous works in this field by
introducing ToMCAT, an AI agent that can reason about individual and shared
mental states. We find that the players' behaviors are affected by what they
see in their in-game field of view, their beliefs about the meaning of the
markers, and their beliefs about which meaning the team decided to adopt. In
addition, we show that ToMCAT's beliefs are consistent with the players'
actions and that it can infer false beliefs with accuracy significantly better
than chance and comparable to inferences made by human observers.Comment: 8 pages, 7 figures, presented in the 2021 AAAI Fall Symposiu
Exotic Higgs Decays in Type-II 2HDMs at the LHC and Future 100 TeV Hadron Colliders
The exotic decay modes of non-Standard Model (SM) Higgses in models with
extended Higgs sectors have the potential to serve as powerful search channels
to explore the space of Two-Higgs Doublet Models (2HDMs) that cannot be studied
effectively using conventional decay channels. Once kinematically allowed,
heavy Higgses could decay into pairs of light non-SM Higgses, or a non-SM Higgs
and a SM gauge boson, with branching fractions that dominate those of the
conventional decay modes to SM particles. In this study, we focus on the
prospects of probing exotic decay channels at the LHC and a future 100 TeV
\emph{pp} collider in the context of Type-II 2HDMs. We study the three
prominent exotic decay channels, A -> HZ, A -> H^+ W and H^+ -> HW, and find
that a 100-TeV pp collider can probe the entire region of the Type-II 2HDM
parameter space that survives current theoretical and experimental constraints
with exotic decay branching fraction > 20%
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Hidden Higgses and Dark Matter at Current and Future Colliders
Despite its indisputable successes, the Standard Model of particle physics (SM) is widely considered to be an effective low-energy approximation to an underlying theory that describes physics at higher energy scales. While there are many candidates for such a theory, nearly all of them predict the existence of additional particles beyond those of the Standard Model. In this work, we present three analyses aimed at discovering new particles at current and future particle colliders. The first two analyses are designed to probe extended scalar sectors, which often arise in theories beyond the Standard Model (BSM). The structure of these extended scalar sectors can be described by a physically well-motivated class of models, known collectively as Two- Higgs Doublet Models (2HDMs). The scalar mass spectrum of 2HDMs is comprised of two CP-even states h and H, a CP-odd state A, and a pair of charged states H± . Traditional searches for these states at particle colliders focus on finding them via their decays to SM particles. However, there are compelling scenarios in which these heavy scalars decay through exotic modes to non-SM final states. In certain regions of parameter space, these exotic modes can even dominate the conven- tional decay modes to SM final states, and thus provide a complementary avenue for discovering new Higgs bosons. The first analysis presented aims to discover charged Higgs bosons H± via top decay at the LHC. We find that the exotic decay modes outperform the conventional decay modes for regions of parameter space with low values of the 2HDM parameter tan β. The second analysis aims to systematically cover all the exotic decay scenarios that are consistent with theoretical and experimental con- straints, at both the 14 TeV LHC and a future 100 TeV hadron collider. We find that the preliminary results are promising - we are able to ex- clude a large swathe of 2HDM parameter space, up to scalar masses of 3.5 TeV, for a wide range of values of tan β, at a 100 TeV collider. In addition to these two analyses, we also present a third, aimed at discovering pair produced higgsinos that decay to binos at a 100 TeV collider. Higgsinos and binos are new fermion states that arise in the Minimal Supersymmetric Standard Model (MSSM). This heavily- studied model is the minimal phenomenologically viable incorporation of supersymmetry - a symmetry that connects fermions and bosons - into the Standard Model. In the scenario we consider, the bino is the lightest supersymmetric partner, which makes it a good candidate for dark matter. Using razor variables and boosted decision trees, we are able to exclude Higgsinos up to 1.8 TeV for binos up to 1.3 TeV
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Modular Procedural Generation for Voxel Maps
Task environments developed in Minecraft are becoming increasingly popular for artificial intelligence (AI) research. However, most of these are currently constructed manually, thus failing to take advantage of procedural content generation (PCG), a capability unique to virtual task environments. In this paper, we present mcg, an open-source library to facilitate implementing PCG algorithms for voxel-based environments such as Minecraft. The library is designed with human-machine teaming research in mind, and thus takes a ‘top-down’ approach to generation, simultaneously generating low and high level machine-readable representations that are suitable for empirical research. These can be consumed by downstream AI applications that consider human spatial cognition. The benefits of this approach include rapid, scalable, and efficient development of virtual environments, the ability to control the statistics of the environment at a semantic level, and the ability to generate novel environments in response to player actions in real time.12 month embargo; first published 01 January 2023This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]
Exotic Higgs Decays in the Type-II 2HDMs at Current and Future pp Colliders
The exotic decay modes of non-Standard Model Higgses can serve as powerful
search channels to explore the parameter space of extended Higgs sectors. In
this Snowmass contribution, we illustrate this using the Two-Higgs Doublet
Model (2HDM) as an example. We first review the current experimental
constraints on the parameter space of a Type-II 2HDM arising from existing
searches for the exotic Higgs decay mode . We then
present the sensitivity of future colliders to discover addition Higgs bosons
using the exotic decay channels ,
and . We find that a 100 TeV collider can probe
almost the entire region of the Type-II 2HDM parameter space that survives
current theoretical and experimental constraints and would therefore be an
ideal machine to search for heavier Higgses in hierarchical scalar sectors.Comment: 6 pages, 2 figures, contribution to Snowmass 202
Exotic Higgs Decays in the Type-II 2HDMs at Current and Future pp Colliders
The exotic decay modes of non-Standard Model Higgses can serve as powerful search channels to explore the parameter space of extended Higgs sectors. In this Snowmass contribution, we illustrate this using the Two-Higgs Doublet Model (2HDM) as an example. We first review the current experimental constraints on the parameter space of a Type-II 2HDM arising from existing searches for the exotic Higgs decay mode . We then present the sensitivity of future colliders to discover addition Higgs bosons using the exotic decay channels , and . We find that a 100 TeV collider can probe almost the entire region of the Type-II 2HDM parameter space that survives current theoretical and experimental constraints and would therefore be an ideal machine to search for heavier Higgses in hierarchical scalar sectors