Conveners
WG3: Electroweak Physics and Beyond the Standard Model: WG3: Session #1 (... topic ...)
- Didar Dobur (Ghent University (BE))
WG3: Electroweak Physics and Beyond the Standard Model: WG3: Session #2
- Didar Dobur (Ghent University (BE))
WG3: Electroweak Physics and Beyond the Standard Model: WG3: Session #3
- Didar Dobur (Ghent University (BE))
WG3: Electroweak Physics and Beyond the Standard Model: WG3: Session #4
- Didar Dobur (Ghent University (BE))
WG3: Electroweak Physics and Beyond the Standard Model: WG3: Session #5
- Attilio Santocchia (Universita e INFN, Perugia (IT))
- Didar Dobur (Ghent University (BE))
WG3: Electroweak Physics and Beyond the Standard Model: WG3: Session #6
- Richard Ruiz (Institute of Nuclear Physics (IFJ) PAN)
- Didar Dobur (Ghent University (BE))
The top-quark pair production in association with heavy-flavour jets (b/c) is a difficult process to calculate and model and is one of the leading sources of background to ttH and 4tops in 1l/2LOS channel. To improve our understanding of this process, a new inclusive and differential measurement of this process was performed.
Many-parameter fits to precise measurements in the framework of the Standard Model Effective Field Theory are becoming a standard interpretation of LHC and other collider data. In this contribution an overview is given of state-of-the-art EFT interpretations in ATLAS with particular emphasis on results in the top quark sector.
Many models of physics beyond the Standard Model (SM) contain enhanced couplings to massive standard model particles like the W,Z,Higgs, and top. We present highlights of searches for new physics beyond the SM in final states containing these heavy particles, using proton-proton collision data collected with the CMS detector at the CERN LHC. The models probed can contain heavy gauge or higgs...
We provide an update on QCD predictions for top-quark pair production close to threshold including bound state effects at the Large Hadron Collider (LHC) [arXiv:2412.16685]. We compute the top-quark pair invariant mass distribution, including Coulomb resummation for bound-state effects, as well as threshold resummation for emissions of soft and collinear gluons. We discuss uncertainty...
The top-quark mass is one of the key fundamental parameters of the Standard Model that must be determined experimentally. Its value has an important effect on many precision measurements and tests of the Standard Model. The Tevatron and LHC experiments have developed an extensive program to determine the top quark mass using a variety of methods. In this contribution, the top quark mass...
Measurements of multiboson production at the LHC are important probes of the electroweak gauge structure of the Standard Model and can constrain anomalous gauge boson couplings. In this talk, recent measurements of diboson production by the ATLAS experiment are presented. Inclusive and differential measurements of WW, ZZ and Zy production are highlighted. The results are used to constrain...
Supersymmetry (SUSY) provides elegant solutions to several problems in the Standard Model, and searches for SUSY particles are an important component of the LHC physics program. The direct production of electroweak SUSY particles, including sleptons, charginos, and neutralinos, is a particularly interesting area with connections to dark matter and the naturalness of the Higgs mass. Naturalness...
Global interpretations of particle physics data within the framework of the Standard Model Effective Field Theory (SMEFT), including their matching to UV-complete models, involve energy scales potentially spanning several orders of magnitude.
Relating these measurements in terms of a common energy scale is enabled by the Renormalisation Group Equations (RGEs).
Here we present a systematic...
This talk presents precise measurement of the properties of the Higgs boson, including its mass, total width, spin, and CP quantum number using the full dataset collected in pp collisions at 13 TeV during Run 2 and at 13.6 TeV during Run 3 of the LHC. The measurements are performed in various Higgs boson production and decay modes, as well as their combinations. Observation of deviations...
The event rates and kinematics of Higgs boson production and decay processes at the LHC are sensitive probes of possible new phenomena beyond the Standard Model (BSM). This talk presents precise measurements of Higgs boson production and decay rates, obtained using the full Run 2 and partial Run 3 pp collision dataset collected by the ATLAS experiment at 13 TeV and 13.6 TeV. These include...
The pursuit of detecting high-energy Higgs boson decays into a pair of heavy quarks is a prominent focus within the ATLAS experiment's physics program. In this study, we introduce an innovative tagger that leverages graph networks and employs tracks as input constituents. Our approach demonstrates a substantial improvement when compared to the previous boosted Higgs boson tagger employed by...
We present the most recent studies of anomalous couplings of the Higgs boson and its CP structure at the CMS experiment. These studies probe BSM effects, such as CP conserving or CP violating couplings to particles with masses not directly accessible at the LHC through virtual quantum loops. Results in the context of effective field theories (EFT) will also be presented.
The discovery of the Higgs boson with the mass of about 125 GeV completed the particle content predicted by the Standard Model. Even though this model is well established and consistent with many measurements, it is not capable to solely explain some observations. Many extensions of the Standard Model addressing such shortcomings introduce additional Higgs bosons, beyond-the-Standard-Model...
Many new physics models predict the existence of new, heavy particles. This talk summarises recent ATLAS searches for Beyond-the-Standard-Model heavy resonances which decay to pairs of quarks, or leptons, using Run 2 and or Run 3 data collected at the LHC, as well as searches for Dark Matter with the same datasets.
Fixed target experiments are excellent tools for searching for signals of weak interacting dark matter in the sub-GeV mass region. The concept of dark portals between hidden and ordinary matter, as described by the Standard Model, typically involves light sub-GeV intermediate states. In particular, the dark photon portal will be considered and discussed within the framework of existing and...
The Higgs boson discovery at the Large Hadron Collider (LHC) completed the Standard Model (SM). Still, the possibility of additional scalar bosons remains open, provided their contributions to electroweak symmetry breaking are sufficiently small. Recent analyses of LHC data have revealed statistically significant anomalies in multi-lepton final states, characterized by events with multiple...
The $K^{+}\rightarrow\pi^{+}\nu\bar{\nu}$ decay is a golden mode for flavour physics. Its branching ratio is predicted with high precision by the Standard Model to be less than $10^{-10}$, and this decay mode is highly sensitive to indirect effects of new physics up to the highest mass scales. A new measurement of the $K^{+}\rightarrow\pi^{+}\nu\bar{\nu}$ decay by the NA62 experiment at the...
The Standard Model of Particle Physics explains many natural phenomena yet remains incomplete. Leptoquarks (LQs) are hypothetical particles predicted to mediate interactions between quarks and leptons, bridging the gap between the two fundamental classes of particles. Vectorlike quarks (VLQs) and Vectorlike leptons (VLLs) lie at the heart of many extensions seeking to address the Hierarchy...
In the Standard Model, the ground state of the Higgs field is not found at zero but instead corresponds to one of the degenerate solutions minimising the Higgs potential. In turn, this spontaneous electroweak symmetry breaking provides a mechanism for the mass generation of nearly all fundamental particles. The Standard Model makes a definite prediction for the Higgs boson self-coupling and...
The Belle and Belle II experiments have collected a 1.1 ab$^{-1}$ sample of $e^+ e^-\to B\bar{B}$ collisions at a centre-of-mass energy corresponding to the $\Upsilon(4S)$ resonance. These data, with low particle multiplicity and constrained initial state kinematics, are an ideal environment to search for rare electroweak penguin $B$ decays and lepton-flavour violating decays to final states...
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...
New physics can manifest itself via lepton-flavour-violating processes in LHC proton-proton collisions. In the past years, different experiments have reported possible indications of new physics violating the lepton-flavour-universality symmetry of the Standard Model. This talk summarizes the most recent searches and precision measurements for lepton-flavour-violating processes with the CMS...
Long-lived particles (LLPs) produced at the LHC travel a macroscopic distance before decaying, producing a unique experimental signature. This is an ideal probe for searching beyond standard model physics and the CMS collaboration has a wide program covering different final states. Recent results on CMS searches for LLP decaying to leptons and hadrons is presented focusing both on inclusive...
Recent highlights of searches for additional non-standard-model Higgs bisons from the CMS experiment are presented.
We will report the status of the milliQan experiment at CERN. The milliQan "bar" detector was completed in June 2023 and has been taking physics data since then. The milliQan "slab" detector was completed in Fall of 2024 and is being commissioned. We will give an update on the readiness of the slab detectorfor physics data taking. Finally, we will present first physics results on the search...
