The head of the MIT Physics Department will welcome our guest at MIT.
We present a Monte Carlo analysis of a Higgs Boson decaying into two bottom quarks produced from electron-positron collisions at 240 GeV center-of-mass energy in the context of the Future Circular Collider (FCC) feasibility study. The Higgs boson decay to two bottom quarks is the most copious Higgs decay and its measurement will allow for the most precise determination of the Higgs couplings...
The FCC-ee would facilitate the search for the rare decay of $H \rightarrow Z + \gamma$ with greater precision. We present a feasibility study of the analysis in the Higgsstrahlung production channel, where the Higgs decays further into the Z and $\gamma$. The events are produced via Monte Carlo generators at a center-of-mass energy of 240 GeV and luminosity of 150 $ab^-1$ and the detector...
The Future Circular Collider (FCC) plans to measure the Z parameters at center-of-mass energies $$ \sqrt{s} \approx m_Z $$ via measurements of the dimuon cross section and forward-backward asymmetries. We produce a numerical model for the Z –> μ+μ- decay with a Monte Carlo simulation to make predictions. We replicate the measurements performed with the L3 detector in the years 1993–95 to...
We investigate qualitatively the relative performance of various Monte Carlo event generators (including Pythia8, and Whizard3) for generating the two-photon back ground in the leptonic and hadronic final states at the FCC-ee. We consider e+e− interactions at the Z pole, where the two-photon background is a non-negligible background for various electroweak precision analyses such as the muon...
The proposed FCC-ee collider will improve electroweak precision measurements by orders-of-magnitude, producing new measurements and potentially revealing inconsistencies within the Standard Model. In our work, we investigate tau polarization precision measurements in order to project finer uncertainties on fundamental SM parameters, including the weak mixing angle. We perform a realistic Monte...
The W boson mass, an important parameter in the Standard Model, has a current measured value of 80.379 GeV with an uncertainty of 12 MeV. At FCC-ee, the expected precision should be reduced to below the 1 MeV level. A Monte-Carlo study is performed using the FCC-ee analysis framework through two decay channels of the W bosons (hadronic and semi-leptonic) at 180 GeV center-of-mass energy to...
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.
Monolithic active pixel sensors (MAPS) represent the state-of-the-art technology for high-resolution, low-material budget detectors for particle-physics applications. The PixElPhi laboratory at MIT was recently created to exploit this technology for future nuclear and particle experiments. In this talk, we will present the activity and the plan for this laboratory, which currently focuses on...
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, I will motivate the study of the ZH process as a means of studying Higgs self-coupling: measurements of Higgs self-coupling are essential as they are directly related to the shape of the Higgs potential, which has implications on the stability of the universe. This project analyzed various jet recombination schemes of a simulated ZH process, and aims to determine the jet...
In this talk, I will inspire how the phenomenology of the Electroweak Phase Transition (EWPT) can guide the search for new physics related to the Higgs sector with the concrete example of Higgs exotic decays. EWPT is the transition from an electroweak symmetric phase to a broken phase in the early universe, and is a cross over in the Standard Model (SM). The EWPT being strongly first order is...
We propose to use an electromagnetic calorimeter based on scintillating crystals to record both Cherenkov and scintillation light at the FCC-ee. Together with a dual-readout hadronic calorimeter, it will allow precise energy measurements of electrons, photons, and jets. In this talk, I'll report the first measurements that utilize PbF2 (non-scintillating crystals) to understand the collection...
I will introduce a simplified model for two colorless heavy vector resonances in the singlet representation of $SU(2)_L$, with zero and unit hypercharge, and use this model to motivate future collider efforts. I will discuss the semi-analytic production of these narrow resonances at proton colliders, and I will show current LHC constraints for a variety of two-body final states. In addition, I...
We study weak isosinglet vectorlike leptons that decay through a small mixing with the tau lepton, for which the discovery and exclusion reaches of the Large Hadron Collider and future proposed hadron colliders are limited. We show how an e+ e- collider may act as a discovery machine for these tau' particles, demonstrate that the tau' mass peak can be reconstructed in a variety of distinct...
Long-lived particles are well motivated in numerous Beyond Standard Model theories including matter/antimatter asymmetry, the origin of electroweak symmetry breaking, Dark Matter, etc. The FCC-ee provides a unique opportunity to search for these distinct experimental signatures. We will present a study of the sensitivity of observing long-lived scalar particles originating from exotic Higgs...
A parameter of major interest in particle physics which has not yet been precisely measured is the Higgs self-coupling. A precise measurement of this coupling is fundamental to the Standard Model (SM), as it has a direct impact on the shape of the Higgs potential. A measurement consistent with the SM would further bolster the accuracy of the SM and confirm the expected meta-stability of the...
This work will present the full simulation and clustering algorithm development of a segmented crystal ECAL option for the IDEA detector, building upon previous 'proto-PFA' work previously simulated in Geant4 by M. Lucchini. On the simulation side, work has been done to integrate with the IDEA dual-readout and tracker packages, all within the latest key4hep framework, moving towards a unified...
We will present the latest developments and plans in the Fermilab group on the development of precision tracking detectors for future collider machines, specifically geared towards FCC-ee applications. Efforts have been focused on advances towards manufacturing of novel sensors and to the design of sophisticated Application Specific Integrated Circuits (ASICs) required to achieve the ambitious...
The CalVision project seeks to develop high resolution calorimetry for the Future Circular Collider (FCC) with state-of-the-art performance for both electromagnetic (EM) and hadronic signatures using the dual-readout technique. We seek to improve the hadronic energy resolution of homogenous scintillating-crystal calorimeters through the measurement and separation of the scintillation and...
The Future Circular Collider (FCC) aims to push the energy and intensity frontiers of particle colliders and plans to be the future of particle physics after CERN’s High Luminosity Large Hadron Collider (HL-LHC) reaches its conclusion in around 2040. To reach its full physics potential it will take multiple decades of operation and having a strong software and computing program. Supporting...
Hadronic calorimeters with dual readout measure both scintillation and Cherenkov lights produced in their active media. They offer improvements in energy resolution and, therefore, have become increasingly interesting due to the need for precision jet measurements at Higgs factories. This talk discusses Geant4 simulations of single-particle responses in sampling and homogeneous ...
LCCO - Local Chromaticity Correction Optics - offers many advantages for the FCCee operation
We report on a conceptual design for a noble-liquid-based EM endcap
calorimeter, where the absorber plates and readout electrodes are
arranged in a turbine-like geometry. This design allows for
frequent shower sampling and highly granular readout, without
introducing cracks in phi. The implementation of this geometry in
the ALLEGRO detector simulation and initial simulation results...
Recent advances in timing detectors at CERN have largely focused on mitigating pileup background in the HL-LHC era. The CMS and ATLAS upgrades addressed the challenges arising from track density and radiation dose- particularly in the forward region. Over the same period generic timing R&D based in the Silicon detector and MicroPattern Gas detector(MPGD) groups developed technologies more...
Electromagnetic calorimetry in high-radiation environments is particularly challenging with more pronounced requirements for the forward regions of collider detectors. The most viable choice is to construct a sampling calorimeter with radiation-hard active media at the expense of high energy resolution. In order to provide a solution for such implementations, we developed a radiation-hard,...
The vertex detector proposed for IDEA and ALLEGRO consists of three layers of silicon detectors still in a conceptual design. In this study we aim to present an investigation of the vertex detector performance focusing on the flavor tagging capabilities with an aim to reveal the most important parameters contributing to the tagging performance along withand how to optimize them in a vertex...
The RADiCAL Collaboration is conducting R&D on high performance electromagnetic (EM) calorimetry to address the challenges expected in future collider experiments under conditions of high luminosity and/or high irradiation such as the FCC.
Under development is a sampling calorimeter
approach, known as RADiCAL modules, based on scintillation and wavelength-shifting (WLS) technologies and...
