Conveners
Parallel: Theory and Experiment: Part 1
- Robert Szafron (BNL)
- Patrizia Azzi (Padova)
Parallel: Theory and Experiment: Part 2
- Robert Szafron (BNL)
- Patrizia Azzi (Padova)
A key aspect of evaluating the physics potential of any proposed Higgs factory is to quantify the effect of the various beam- and machine-induced backgrounds on the detector occupancy, and, ultimately, on the expected precision reach. In this work, we present results for the effects of incoherent pairs and photoproduced hadrons from beamstrahlung, which were interfaced with the SiD detector...
We present a study of the measurement of the cross section of hadronic Z decays at the Z pole. We will compare the state of the art Monte Carlo generators and we will compare the performance expected for the FCC-ee detectors with the LEP detectors. We also have a more detailed discussion of various backgrounds and their corresponding challenges.
This presentation focuses on the study of high multiplicity electron-positron (e+e-) collisions at the Future Circular Collider (FCC), particularly in the search for collective phenomena analogous to those observed in heavy ion collisions. Previous studies at the Z pole and LEP2 using archived ALEPH data have laid the groundwork for this exploration, but the FCC's capabilities offer a new...
The ParticleNet tagger is a graph neural network devoted to the tagging of jets from the hadronization of multiple flavors. Its impressive and unprecedented tagging performance allows for accessing rare and challenging hadronic final states. This study shows the fast-simulation-based characterization of the ParticleNet performance evolution as a function of the IDEA vertex detector single-hit...
We apply machine-learning techniques to the effective-field-theory analysis of the
$e^+e^-\to W^+ W^-$ processes at future lepton colliders, and demonstrate their advantages in comparison with conventional methods, such as optimal observables. In particular, we show that machine-learning methods are more robust to detector effects and backgrounds, and could in principle produce unbiased...
A major priority of the FCC-ee physics program is the measurement with the best possible precision the couplings of the Higgs Boson to other standard model particles. In this talk, we will present the current status of the physics potential for measuring these couplings. We will also discuss the latest developments in object identification tools essential for these measurements. Additionally,...
The precise measurement of the Higgs boson coupling to other standard model (SM) particles allows for up to 30\% of the Higgs boson width to originate from beyond the SM (BSM) decays. In the SM, the Higgs boson decays to invisible final states through the $H\rightarrow ZZ \rightarrow 4\nu$ process with a branching fraction of $(\mathcal{O})10^{-3}$ . This rate can be significantly enhanced...
The measurement of the Higgs boson properties at the future e+e− collider can be achieved through the Higgs-strahlung process. Analysis considering leptonic channels have been addressed but they might be statistically limited due to small branching ratios. This analysis extends the studies to full hadronic decays which represent a large branching ratios of about 70%. It also comes with great...
Prospects to constrain CP-odd contributions in the Higgs-strahlung process at a future electron-positron collider e+e- => ZH are presented. A realistic study is performed in the framework of the FCC-ee collider at the center-of-mass energy of 240 GeV, with reconstruction of the IDEA detector performed using the DELPHES framework. A matrix-element package, MELA, is implemented that uses event...
New fermions can be searched for directly at high-energy colliders, such as the LHC, or indirectly through precision measurements at e+e- colliders like FCC-ee. This talk presents the complementarity of these approaches for a broad class of simplified fermionic dark sectors models. The lightest new fermion could be stable or unstable. For the Higgs precision measurements we primarily focus on...
In this work we present the prospects for measurements of the top-quark couplings at future facilities, with special emphasis in lepton colliders. We will discuss projections for the high luminosity phase of the Large Hadron Collider and future Higgs/electroweak/top factory lepton colliders. Results are presented for the expected bounds on Wilson coefficients of the relevant SMEFT operators...
Axion-like particles (ALPs) are pseudo Nambu-Goldstone bosons of spontaneously broken global symmetries in high-energy extensions of the Standard Model (SM). This makes them prime targets for future experiments aiming to discover new physics which addresses some of the open questions of the SM. While future high-precision experiments can discover ALPs with masses well below the GeV scale,...
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 → bs, cu decays as a...
