We estimate the expected precision at a multi-TeV muon collider for measuring Higgs boson couplings with electroweak gauge bosons, $HVV$ and $HHVV\ (V=W^\pm,Z)$, as well trilinear self-coupling $HHH$. At very high energies both single double productions rely on vector-boson fusion (VBF) topology. The outgoing remnant particles have strong tendency to stay in forward region, leading configuration of "inclusive process" making it difficult isolate $ZZ$ events from $WW$ fusion. In channel, we...

The Weakly Interacting Massive Particle (WIMP) paradigm is one of the most compelling scenarios for particle dark matter (DM). We show in this paper that a high energy muon collider can make decisive statements about WIMP DM, and should serve as its main physics driver cases. demonstrate by employing DM lightest member an electroweak (EW) multiplet, which simple, yet challenging given minimal signature thermal target mass scale 1 TeV$-$23 TeV. perform first study reach colliders, focusing on...

We perform a comprehensive analysis of the scattering matter and gravitational Kaluza-Klein (KK) modes in five-dimensional gravity theories. consider localized on brane as well bulk extra dimension for scalars, fermions vectors respectively, an arbitrary warped background. While naive power counting suggests that there are amplitudes which grow fast <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi mathvariant="script">O</a:mi><a:mo...

In a large class of scenarios, dark matter (DM) particles that belong to multiplet the standard model (SM) weak interactions are challenging probe in direct detection experiments due loop-suppressed cross-sections. Direct production at colliders is thus crucial look for such DM candidates, and under current estimates, future runs 14-TeV LHC projected masses around 300 GeV belonging an SU(2) doublet (Higgsino-like), 900 triplet (wino-like). We examine how far this mass reach can be extended...

It has long been recognized that the scattering of electroweak particles at very high energies is dominated by vector boson fusion, which probes origin symmetry breaking and offers a unique window into ultraviolet regime Standard Model (SM). Previous studies assume SM-like couplings rely on effective <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi>W</a:mi></a:mrow></a:math> approximation (or parton distribution), whose validity well established within SM...

A bstract We evaluate the impact of one-loop electroweak corrections to spin-independent dark matter (DM) scattering cross-section with nucleons ( σ SI ), in models a so-called blind spot for direct detection, where leading-order prediction relevant DM coupling Higgs boson, and therefore , are vanishingly small. Adopting simple illustrative scenario which state results from mixing singlet doublet fermions, we compute higher order scalar effective operator contributions stemming both triangle...

In this review, we consider a general theoretical framework for fermionic color-singlet states—including singlet, doublet, and triplet under the Standard Model SU(2) L gauge symmetry, corresponding to bino, higgsino, wino in supersymmetric theories—generically dubbed electroweakinos their mass eigenstates. Depending on relations among these states’ three parameters mixing after electroweak symmetry breaking, sector leads rich phenomenology that may be accessible current near-future...

Vectorial partners of the Standard Model quarks and leptons are predicted in many dynamical models electroweak symmetry breaking. The most easily accessible these new particles, either due to mass or couplings, typically expected be third-generation fermions. It is therefore essential explore signatures particles at future high-energy colliders. We study potential a muon collider singly produce vectorlike top-quark partner via an dipole moment operator, such operator being typical composite...

Theories which provide a dynamical explanation for the large top-quark mass often include TeV-scale vector-like and bottom-quark partner states can be potentially discovered at LHC. These are currently probed through model-independent searches pair-production via gluon fusion, as well model-dependent complementary electroweak single production. In this paper we study potential to extend those partners of third-generation Standard Model quarks on basis their expected chromomagnetic...

We study the discovery potential for heavy axion-like particles (ALPs) and perspectives determining their coupling properties at a muon collider. Focusing on couplings to Standard Model (SM) gauge bosons $\gamma, Z, W^\pm$, we show that high-energy collider can substantially extend mass coverage, essentially reaching kinematic limit of energy. The unique kinematics allow non-ambiguous determination individual strengths. associated production via $\mu^+\mu^-$ annihilation VBF processes with...

In this work we demonstrate that the mixed gravitational and scalar sectors of five-dimensional Goldberger-Wise (GW) model, in which size a warped extra dimension is dynamically determined, has ``hidden'' dual $N=2$ supersymmetric structure. This symmetry structure, generalization one found unstabilized Randall-Sundrum result spontaneously broken diffeomorphism invariance underlying theory. The supersymmetries relate properties spin-1 spin-0 modes ``eaten'' by massive spin-2 Kaluza-Klein...

Building on work by Hang and He, we show how the residual five-dimensional diffeomorphism symmetries of compactified gravitational theories with a warped extra dimension imply equivalence theorems which ensure that scattering amplitudes helicity-0 helicity-1 spin-2 Kaluza-Klein states equal (to leading order in energy) those corresponding Goldstone bosons present 't-Hooft-Feynman gauge. We derive set Ward identities leads to transparent power-counting involving states. explicitly calculate...

We explore the scenarios where only accessible new states at electroweak scale consist of a pair color-singlet particles, masses which are degenerate tree level and split by symmetry breaking loop level. For sake illustration, we consider supersymmetric model study following three representative cases with lower-lying as (a) two spin-$1/2$ Higgsino ${\mathrm{SU}(2)}_{L}$ doublets, (b) wino triplet (c) spin-0 left-handed slepton doublet. Due to mass degeneracy, those difficult observe LHC...

In a previous publication, we showed that high energy muon collider can make decisive statements about the electroweak (WIMP) Dark Matter (DM), reaching DM mass which could give observed thermal relic abundance. this document, report new studies of spin-$0$ minimal WIMP at colliders, and update our results on fermionic spin-$1/2$ case. We find that, by combining multiple inclusive missing search channels, it is possible to fully cover targets scalar doublets, Dirac triplet, with 10 TeV...

A bstract We present a comprehensive study on how to distinguish the properties of heavy dijet resonances at hadron colliders. variety spins, chiral couplings, charges, and QCD color representations are considered. Distinguishing different is particularly difficult To determine structure, we consider third jet radiated in resonant event. show that relative rates three-jet versus two-jet processes sensitive representation resonance. also analytically antennae radiation pattern soft depends...

In this paper we investigate the scattering amplitudes of spin-2 Kaluza-Klein (KK) states in Randall-Sundrum models with brane-localized curvature terms. We show that presence interactions modifies properties (4D) scalar fluctuations metric, resulting massive KK which grow as ${\cal O}(s^3)$ instead O}(s)$. uncover new constraints on size based consistency Sturm-Liouville mode systems and spin-0 metric fluctuations. connect to diffeomorphism invariance compactified theory interactions....

The Higgs boson decay into bottom quarks is the dominant channel contributing to its total width, which can be used measure quark Yukawa coupling and mass. This width has been computed up $\mathcal{O}(\alpha_s^4)$ for process induced by coupling, assuming massless final states, corresponding corrections beyond $\mathcal{O}(\alpha_s^2)$ are found less than $0.2\%$. We present an analytical result massive at $\mathcal{O}(\alpha_s^3)$ that includes contribution from top process. have made use...

In this paper we investigate the scattering amplitudes of spin-2 Kaluza-Klein (KK) states in Randall-Sundrum models with brane-localized curvature terms. We show that presence interactions modifies properties (4D) scalar fluctuations metric, resulting massive KK which grow as <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi mathvariant="script">O</a:mi><a:mo stretchy="false">(</a:mo><a:msup><a:mi>s</a:mi><a:mn>3</a:mn></a:msup><a:mo...

We perform a comprehensive analysis of the scattering matter and gravitational Kaluza-Klein (KK) modes in five-dimensional gravity theories. consider localized on brane as well bulk extra dimension for scalars, fermions vectors respectively, an arbitrary warped background. While naive power-counting suggests that there are amplitudes which grow fast ${\cal O}(s^3)$ [where $s$ is center-of-mass energy-squared], we demonstrate cancellations between various contributions result total amplitude...

We present a comprehensive study on how to distinguish the properties of heavy dijet resonances at hadron colliders. A variety spins, chiral couplings, charges, and QCD color representations are considered. Distinguishing different is particularly difficult To determine structure, we consider third jet radiated in resonant event. show that relative rates three-jet versus two-jet processes sensitive representation resonance. also analytically antennae radiation pattern soft depends structure...

It has long been recognized that the scattering of electroweak particles at very high energies is dominated by vector boson fusion, which probes origin symmetry breaking and offers a unique window into ultraviolet regime SM. Previous studies assume SM-like couplings rely on effective $W$ approximation (or parton distribution), whose validity well-established within SM but not yet studied in presence anomalous Higgs couplings. In this work, we critically examine production two bosons $VVh$...