Conveners
Electroweak & Higgs Physics: Extended Scalar Sectors & Quantum Tests
- Daniel Guerrero (Fermi National Accelerator Lab. (US))
Electroweak & Higgs Physics: Higgs Physics at the LHC
- Samuel Homiller (Harvard University)
Electroweak & Higgs Physics: Double/Multiple Higgs
- LINGFENG LI (Brown U.)
Electroweak & Higgs Physics: EW Baryoenesis and Phase Transition
- David Tucker-Smith
Electroweak & Higgs Physics: Electroweak Physics at the LHC
- Zack Sullivan (Illinois Institute of Technology)
Electroweak & Higgs Physics: Higgs Physics at Future Collider
- Neil Christensen (Illinois State University)
We develop benchmarks for resonant di-scalar production in the generic
complex singlet scalar extension of the Standard Model (SM), which contains two new scalars. These benchmarks maximize di-scalar resonant production: $pp\rightarrow h_2 \rightarrow h_1 h_1/h_1h_3/h_3h_3$, where $h_1$ is the observed SM-like Higgs boson and $h_{2,3}$ are new scalars. The decays $h_2\rightarrow h_1h_3$ and...
The knowledge of the Higgs potential is crucial for understanding the origin of mass and the thermal history of our Universe. We show how collider measurements and observations of stochastic gravitational wave signals can complement each other to explore the multiform scalar potential in the two Higgs doublet model. In our investigation, we analyze critical elements of the Higgs potential to...
We study the conditions under which the CP violation in the quark mixing matrix can leak into the scalar potential of the real two-Higgs-doublet model (2HDM) via divergent radiative corrections, thereby spoiling the renormalizability of the model. We show that any contributing diagram must involve 12 Yukawa-coupling insertions and a factor of the hard $U(1)_{PQ}$-breaking scalar potential...
Exploring additional CP violation sources at the Large Hadron Collider (LHC) is vital to the Higgs physics programme beyond the Standard Model. An unexplored avenue at the LHC is a significant non-linear realization of CP violation, naturally described in non-linear Higgs Effective Field Theory (HEFT). In this talk, we will discuss constraining such interactions across a broad spectrum of...
Field space geometry has been fruitful in understanding many aspects of EFT, including basis-independent criteria for distinguishing HEFT vs. SMEFT, reorganization of scattering amplitudes in covariant form, derivation of renormalization group equations and geometric soft theorem. We incorporate field space geometry in functional matching by dividing the field space into light and heavy...
We explore the connection between the Higgs hierarchy problem and the metastability of the electroweak vacuum. Previous work has shown that metastability bounds the magnitude of the Higgs mass squared parameter in the $m_H^2 < 0$ case, realized in our universe. We argue for the first time that metastability also bounds the Higgs mass in the counterfactual $m_H^2 > 0$ case; that is,...
Beyond the Standard Model (BSM) Higgs with a same-flavor, opposite-charge dilepton plus Missing Transverse Energy (MET) final state are predicted by many models, including extensions of supersymmetry with an additional scalar. Such models are motivated by phenomenological issues with the Standard Model, such as the hierarchy problem, and by astrophysical observations such as the excess of...
We present a search for the y+H production mode with data from the CMS experiment at the LHC using 138fb$^{-1}$ of data with sqrt(s) = 13TeV. In this analysis we target a signature of a boosted Higgs boson recoiling against a high energy photon for H->4l and H->bb final states. Effective HZฮณ and Hฮณฮณ anomalous couplings are considered in this work within the framework of Effective Field Theory....
The Standard Model (SM) predicts couplings to the Higgs boson for a given mass of the Higgs boson, and experimental values different from these predictions would be strong indicators of physics beyond the SM. While Higgs decays to vector bosons and third-generation charged fermions have been established with good agreement to SM couplings, the Higgs boson coupling to charm quarks has yet to be...
The Higgs boson gives masses to all massive particles in the Standard Model (SM) and plays a crucial role in the theory. Studying different production and decay modes of the Higgs at the Large Hadron Collider is essential. The Vector Boson Fusion (VBF) is the second-largest production mechanism of the Higgs. Higgs bosons have the largest probability of decaying into a pair of bottom quarks,...
In this talk, we present the two-loop order $\mathcal{O}(\alpha\alpha_s)$ correction to the bottom quark on-shell wavefunction renormalization constant and we update the $\overline{MS}$-mass and the Yukawa coupling corrections at the same order, considering the full dependence on the top quark mass and on the bottom mass itself.
The Georgi-Machacek (GM) model is a motivated extension of the Standard Model (SM) that predicts the existence of singly and doubly charged Higgs bosons (denoted Hยฑ and Hยฑยฑ). Searches for these types of particles were conducted by the ATLAS collaboration at CERN with 139 fb$^{-1}$ of $\sqrt{s} = 13$ TeV $pp$ collision data (Run 2, collected between 2015 and 2018, see arXiv:2312.00420 and...
We present calculations of higher-order QCD corrections for the production of a heavy charged-Higgs pair ($H^+ H^โ$) in the two-Higgs-doublet model at LHC energies. We calculate the NNLO soft-plus-virtual QCD corrections and the N$^3$LO soft-gluon corrections to the total and differential cross sections in single-particle-inclusive kinematics.
This talk discusses a new method to overcome common limitations in data-driven background predictions by validating the background model with synthetic data samples obtained using hemisphere mixing. These synthetic data samples allow for the validation of the extrapolation of the background model to the relevant signal region and avoid the problem of low statistical power in the most...
The results of a search for Higgs boson pair (HH) production in the decay channel to two bottom quarks and two W bosons using CMS data will be presented. The search is based on proton-proton collision data recorded at โs = 13 TeV center-of-mass energy during the period 2016 to 2018, corresponding to an integrated luminosity of 138 fbโ1 and includes both resonant and non resonant as well as...
The simplest extension that can be added to the SM is the addition of a real singlet scalar S, which can result in a double Higgs bosson production if this new singlet is sufficiently heavy. New benchmark points are found by maximizing the production rate, which will allow to compare to the experimental results while this are being searched. The maximum values are shown for different values of...
A search is presented for pair production of higgsinos in scenarios with gauge-mediated supersymmetry breaking. Each higgsino is assumed to decay into a Higgs boson and a nearly-massless gravitino. The search targets the $b\bar{b}$ decay channel of the Higgs bosons, leading to a reconstructed final state with at least three energetic $b$-jets and missing transverse momentum. Two complementary...
Primordial black holes (PBHs) can be formed from the collapse of large-density inhomogeneities in the early Universe through various mechanisms. One such mechanism is a strong first-order phase transition, where PBH formation arises due to the delayed vacuum transition. The probabilistic nature of bubble nucleation implies that there is a possibility that large regions are filled by the false...
Its been demonstrated that "optimized partial dressing" (OPD) thermal mass resummation, which uses gap equation solutions inserted into the tadpole, efficiently tames finite temperature perturbation theory calculations of the effective thermal potential, without necessitating use of the high-temperature approximation. Even though it was shown that OPD has a similar scale dependence as 3D EFT...
We consider a classically conformal $U(1)$ extension of the Standard Model (SM) in which the new $U(1)$ symmetry is radiatively broken via the Coleman-Weinberg mechanism, after which the $U(1)$ Higgs field $\phi$ drives electroweak symmetry breaking through a mixed quartic coupling with the SM Higgs doublet via coupling constant $\lambda_{mix}$. For $m_{\phi}$ < $\frac{m_{h}}{2}$, the coupling...
Our study presents a comprehensive analysis of baryon number violation during the electroweak phase transition (EWPT) within the framework of an extended scalar electroweak multiplet. We perform a topological classification of scalar multiplet's representation during the EWPT, identifying conditions under which monopole or sphaleron field solutions emerge, contingent upon whether their...
Minimal Supersymmetric Standard Model(MSSM) shortcomings in inducing a strong first-order phase transition and providing sufficient CP violation to explain the observed baryon asymmetry in the universe(BAU). In this talk, I will discuss how BAU could be generated in the context of Next-to-Minimal Supersymmetric Standard Model(NMSSM), and how strong the CP violation ingredients in NMSSM will be...
We employ a derivative expansion method to analyze the effective action within
the SU(2)-Higgs model at finite temperature. By utilizing a specific power
counting scheme, we compute gauge-invariant constraints on primordial gravi-
tational waves arising from a thermal first-order electroweak phase transition.
We then compare these results with findings from a pre-existing...
The forward-backward asymmetry in DrellโYan production and the effective leptonic weak mixing angle are measured using a sample of proton-proton collisions at $\sqrt{s}$ = 13 TeV collected by the CMS experiment and corresponding to an integrated luminosity of 137 fbโ1. The measurement uses both dimuon and dielectron events, and is performed as a function of the dileptonโs mass and rapidity....
In the standard model of particle physics, the spontaneous symmetry breaking of the complex Higgs field gives rise to the massive Higgs boson and three Goldstone bosons. These Goldstone bosons give the longitudinal degree of freedom to the W and Z bosons. This analysis studies diboson polarization states, in a phase space where the longitudinal-longitudinal contribution is enhanced, with $WZ$...
We propose an analysis to measure the branching fraction of the Z boson decaying to $b\bar{b}b\bar{b}$ at the CMS detector. This quantity was previously measured by the LEP experiments to an uncertainty of about $36\%$ but has not yet been measured at the LHC; such a measurement would be a high-precision test of QCD involving $b$-quarks. The rarity of this decay, about $4*10^{-4}$, and the...
Diboson production in association with jets is studied in the fully leptonic final states, pp โ (Z/ฮณโ)(Z/ฮณโ) โ 2โ2โโ, (โ, โโ = e or ฮผ), in proton-proton collisions at a center-of-mass energy of 13 TeV. The data sample corresponds to an integrated luminosity of 138 $\textrm{fb}^{โ1}$ collected with the CMS detector at the LHC. Differential distributions and normalized differential cross...
We investigate the $W$ boson exotic decay channel, $W \rightarrow \ell\ell\ell \nu$, at LHC. Although the decay branching ratio is suppressed by the four body final states, the large abundance of produced W boson make the compensation. After enumerating the signal and all classes of background, the Deep Neural Network (DNN) machine learning is exploited for optimization. Results indicate that...
We present the results for NLO QED correction to the Neutral Current Drell-Yan process using jettiness subtraction method.
The jettiness subtraction method utilizes Soft and Collinear Effective Theory (SCET) to construct the factorization theorem and relevant ingredients for the precision calculations for various processes. While the jettiness subtraction method was originally developed for...
We propose a novel method using the ZZ-fusion channel and forward muon detection at high-energy muon colliders to address the challenge of the Higgs couplingwidth degeneracy. Our approach enables inclusive Higgs rate measurement to 0.75%
at 10 TeV muon collider, breaking the coupling-width degeneracy. Results indicate
the potential to refine Higgs coupling to sub-percent levels and estimate...
In this talk we detail how combining recent developments in flavor-tagging and novel statistical analysis techniques will allow future high energy and high statistics electron-positron colliders, such as the FCC-ee, to place phenomenologically relevant bounds on flavor violating Higgs and Z decays to quarks. As a proof of principle, we assess the FCC-ee reach for Z/h โ bs, cu decays as a...
Electroweak Precision Measurements are stringent tests of the Standard Model and sensitive probes to New Physics. Accurate studies of the Z-boson couplings to the first-generation quarks could reveal potential discrepancies between the fundamental theory and experimental data. Future e+e- colliders running at the Z pole and around the ZH threshold would be an excellent tool to perform such a...
SMEFT is an efficient tool to parametrize the effect of BSM physics in a model-independent way. We study di-Higgs and tri-Higgs productions at the muon collider which is parametrized by the dimension 6 mass operator. We also study di-boson and tri-boson processes which also include the production of Goldstone bosons. We discuss possible model dependence of multi-boson processes resulting from...
The study of Higgs boson production at large transverse momentum is one of the new frontiers for the LHC Higgs physics program. This talk will present the first measurement of Higgs boson production in association with a vector boson in the full hadronic qqbb final state using data recored by the ATLAS detector at the LHC in pp collision at 13 TeV and corresponding to an integrated luminosity...
We examine the possibility of using muon colliders to make complementary measurements if a non-zero electron EDM is observed in future experiments. All particles that couple to electroweak gauge bosons and the Higgs will contribute to leptonic EDMs through Barr-Zee diagrams, at the 2-loop level. These diagrams have analogous contributions to vector boson fusion present at muon colliders. We...
