Conveners
Non-SUSY extensions of the Standard Model
- Pouya Asadi (University of Oregon)
- Karri Di Petrillo (University of Chicago)
- Cristián Peña (Fermi National Accelerator Lab. (US))
- Zhen Liu (University of Minnesota)
Non-SUSY extensions of the Standard Model
- Zhen Liu (University of Minnesota)
- Cristián Peña (Fermi National Accelerator Lab. (US))
- Karri Di Petrillo (University of Chicago)
- Pouya Asadi (University of Oregon)
Non-SUSY extensions of the Standard Model
- Pouya Asadi (University of Oregon)
- Zhen Liu (University of Minnesota)
- Cristián Peña (Fermi National Accelerator Lab. (US))
- Karri Di Petrillo (University of Chicago)
Non-SUSY extensions of the Standard Model
- Karri Di Petrillo (University of Chicago)
- Pouya Asadi (University of Oregon)
- Cristián Peña (Fermi National Accelerator Lab. (US))
- Zhen Liu (University of Minnesota)
We discuss unusual θ terms that can appear in field theories that allow global vortices. These "Cheshire θ terms" induce Aharonov-Bohm effects for some particles that move around vortices. For example, a Cheshire θ term can appear in QCD coupled to an axion and induces Aharonov-Bohm effects for baryons and leptons moving around axion strings. We point out a potential experimental signature...
We explore the possibility of CP-violation in the complex-singlet extension of 2HDM. The addition of complex singlet paves the way for additional sources of CP-violation compared to 2HDM. If a Z2-symmetry is imposed on the complex-singlet, such a model can accommodate a dark matter candidate as well. We identify the regions of parameter space, that can fit DM observables and at the same time...
Millicharged particles are generic in theories of dark sectors. A cosmic or local abundance of them may be produced by the early universe, stellar environments, or the decay or annihilation of dark matter/dark energy. Furthermore, if such particles are light, these production channels result in a background of millicharged radiation. We show that light-shining-through-wall experiments...
Heavy Neutral Leptons (HNLs) are promising extensions of the Standard Model that could explain neutrino masses, baryogenesis, and dark matter. A key question is whether HNLs are Dirac or Majorana particles, with the latter allowing lepton number violation. We investigate the potential of the proposed FASER2 detector, alone and in combination with ATLAS, to distinguish between Dirac and...
Composite Higgs models offer an elegant solution to the hierarchy problem by assuming that the Higgs boson is not an elementary particle but a composite state. The Higgs emerges as a pseudo-Nambu-Goldstone boson due to spontaneous symmetry breaking within a new strongly interacting sector.
We focus on minimal realizations of such models with fermionic UV completions that preserve custodial...
Heavy axions address the strong CP problem in a robust way, less susceptible to high scale corrections to their potential. We outline a framework for producing a GeV scale axion while simultaneously addressing the other naturalness issue of the Standard Model: the electroweak hierarchy problem. This is done by modifying the twin Higgs framework so that the twin sector has a larger color group...
The structure of chiral anomalies in braneworlds is subtle. The divergence of a 5D current has long been known to be localized to end-of-the world branes, and to be evenly divided between these branes. However, such branes may be hidden by horizons, or may even be replaced by soft-wall geometries in certain cases. We demonstrate the correct approach, particularly in models motivated by the...
With LHC Run 3 in progress, the 125GeV Higgs boson couplings are being examined in greater detail, while testing for additional scalars. Multi-Higgs frameworks allow Higgs couplings to significantly deviate from Standard Model values, enabling indirect probes of extra scalars. We consider the possibility of large pseudoscalar Yukawa couplings in the softly-broken three-Higgs doublet model with...
In this talk, I will show a novel minimal non-abelian gauge group to embed the G_{SM}/Z1 quotient with fractionally charged beyond the standard model matter fields and show how we can define a new quantum number n_6 that is written in terms of the generators of G_{SM}. We also comment on interesting aspects of this new number, like how the degree of compositeness can shift n_6. This new...
In Randall-Sundrum models, the AdS/CFT correspondence motivates the addition of Chern-Simons terms that flow anomalies such that they are entirely localized on the ultraviolet brane. This has interesting implications both for collider physics and for cosmology. We discuss the implications for holographic composite axion solutions to the strong CP problem, and for inflationary cosmology.
If the quarks or leptons are charged under a new $U(1)$ gauge
symmetry, then besides a $Z'$ boson there must exist at least one new
boson whose decay products include Standard Model particles. In the
case of a minimal symmetry breaking sector, that new boson is a scalar
$\phi$ that couples to the $Z'$ boson as well as to the new
fermions required to cancel the $U(1)$ gauge anomalies. The...
We present a systematic study of one-loop quantum corrections in scalar effective field theories from a geometric viewpoint, emphasizing the role of field-space curvature and its renormalisation. By treating the scalar fields as coordinates on a Riemannian manifold, we exploit field redefinition invariance to maintain manifest coordinate independence of physical observables. Focusing on the...
Various theories beyond the Standard Model predict new, long-lived particles with unique signatures which are difficult to reconstruct and for which estimating the background rates is also a challenge. Signatures from displaced and/or delayed decays anywhere from the inner detector to the muon spectrometer, as well as those of new particles with fractional or multiple values of the charge of...
Many theories beyond the Standard Model predict new phenomena giving rise to multijet final states. These jets could originate from the decay of a heavy resonance into SM quarks or gluons, or from more complicated decay chains involving additional resonances that decay e.g. into leptons. Also of interest are resonant and non-resonant hadronic final states with jets originating from a dark...
Many theories beyond the Standard Model predict new phenomena, such as heavy vectors or scalar, vector-like quarks, and leptoquarks in final states containing bottom or top quarks. Such final states offer great potential to reduce the Standard Model background, although with significant challenges in reconstructing and identifying the decay products and modelling the remaining background. The...
Many different theories beyond the Standard Model (SM) predict that new physics will manifest itself by decaying into final states involving leptons. Leptoquarks are predicted by many new physics theories to describe the similarities between the lepton and quark sectors of the SM. Right-handed Ws and heavy-neutrinos are also predicted by many extensions of the SM in the gauge sector, and...
$SU(5)$ grand unified model, which unifies SM quarks and leptons in $\overline{5}$ and $10$ dimensional irreducible representations~(irrep), yields observationally inconsistent tree-level Yukawa relations when only a single $5_{\rm H}$ or $45_{\rm H}$ dimensional irrep having a single Higgs contributes to the Yukawa sector. For instance, only $5_{\rm H}$ dimensional Higgs in the Yukawa sector...
Although protons are baryons with an overall vanishing lepton number, they possess a non-trivial leptonic content arising from quantum fluctuations which can be described by lepton parton distribution functions (PDFs) of the proton. These PDFs have been recently computed and can be used to define lepton-induced processes at high-energy colliders. In this article, we propose a novel way to test...
It is common practice to explain deviations between data and Standard-Model predictions by postulating new particles at the TeV scale ad-hoc. This approach becomes much more convincing, if one successfully embeds the postulated particles into a UV completion which addresses other conceptual or phenomenological shortcomings of the SM. I present a study of an SO(10) grand unified theory which...
We present a recomputation of the Large Hadron Collider (LHC) bounds for the Two-Higgs-Doublet Model (2HDM) extended with vector-like quarks (VLQs), building upon the reported limits for the Standard Model (SM) augmented with VLQs. Our analysis focuses on two distinct scenarios: the vector-like T singlet and the vector-like T doublet. By re-evaluating the experimental constraints and...
We consider weakly interacting massive particle (WIMP) dark matter in a parity solution to the strong CP problem. The WIMP phenomenology is drastically affected by the presence of parity partners of WIMP and electroweak gauge bosons. We focus on a parity extension of $SU(2)_L$ doublet fermion dark matter, identify the viable parameter space, and derive the predictions of the theory. We find...
We present the current exclusion limits for vector-like quarks (VLQs) of bottom (B) and top (T) types, based on combined ATLAS and CMS data from the LHC. For B-type VLQs, pair production excludes masses up to 1.52 TeV in doublet scenarios, while single production limits the mixing parameter κ to values between 0.2 and 0.7. For T-type VLQs, pair production excludes masses up to 1.49 TeV, with...
