Second Annual U.S. Future Circular Collider (FCC) Workshop 2024

America/New_York
Building 32, 32-123 (MIT)

Building 32, 32-123

MIT

Christoph Paus (staff@mit.edu)
Description

design by Jordan Lang 

Overview

The annual US FCC workshop series started in 2023 at BNL with the idea of building and fostering the US community around the FCC and in particular the FCC-ee project. We will have the second instance of this workshop at MIT in Cambridge, MA.

After the long and rich Snowmass process and multiple P5 panel town hall meetings, the High-Energy Physics community has come to a conclusion on what to recommend to the DOE and NSF about our future. The P5 released its report including those recommendations on December 7/8, 2023. This workshop will allow the US FCC community to come together and discuss in detail the recommendations of P5. The DOE and NSF will be invited to this meeting, and we expect a fruitful discussion.

Status reports will be given on the FCC-ee accelerator, detector, computing & software and physics analysis program including theory. In addition, we will host a plenary session for the expression of interest of US institutions for potential contributions in the areas of: the accelerator, the emerging detector collaborations, the physics program, and the software/computing infrastructure development. Particular emphasis will be on young investigator and student contributions to the ongoing FCC-ee Feasibility Study.

The workshop dovetails nicely within the general FCC schedule, preceded by the FCC Physics days in Annecy (January 29 - February 2, 2024) and followed by the summer FCC Week in June.

International Organizing Committee

  • Martin Aleksa (CERN)
  • Patrizia Azzi (Padova)
  • Anadi Canepa (FNAL)
  • Sergei Chekanov (ANL)
  • Sarah Eno (Maryland)
  • Ayres Freitas (Pittsburgh)
  • Julia Gonski (SLAC)
  • Samuel Homiller (Harvard)
  • Zoltan Ligeti (LBNL)
  • Michelangelo Mangano (CERN)
  • Christoph Paus (MIT)
  • Marc-André Pleier (BNL)
  • Srini Rajagopalan (BNL)
  • Tor Raubenheimer (SLAC)
  • Sally Seidel (New Mexico)
  • Vladimir Shiltsev (NIU)
  • Robert Szafron (BNL)
  • Alessandro Tricoli (BNL)
  • Christopher Tully (Princeton)

Local Organizing Committee

  • Alisa Cabral
  • Karen Dow
  • Luca Lavezzo
  • Elsye Luc
  • Christoph Paus
Participants
  • Abhisek Datta
  • Abid Patwa
  • Abraham Tishelman-Charny
  • Alaettin Serhan Mete
  • Alessandro Tricoli
  • Alexander Paramonov
  • Amin Abouibrahim
  • Anadi Canepa
  • Anders Ryd
  • Andre Sailer
  • Andrea Sciandra
  • Andrea Thamm
  • Andreas Werner Jung
  • Andrei Gritsan
  • Andrew Lankford
  • Andrew White
  • Andrey Ryzhov
  • Aneesh Anandanatarajan
  • Anthony Affolder
  • Anthony Badea
  • Anyes Taffard
  • Aram Apyan
  • Ariel Schwartzman
  • Artur Apresyan
  • Ashutosh Kotwal
  • Ayman Noreldaim
  • Ayres Freitas
  • Ben Nachman
  • Blaise Delaney
  • Bob Hirosky
  • Boleslaw Wyslouch
  • Brett Parker
  • Brieuc Francois
  • Caden Glenn
  • Caitlin Kubina
  • Carl Haber
  • Cassandra Lawson
  • Caterina Vernieri
  • Celia Fernandez Madrazo
  • Chad Freer
  • charles Young
  • Charlotte Myers
  • Chinar Deshpande
  • Chris Bee
  • Christoph Paus
  • Christophe Grojean
  • Christopher Madrid
  • Christopher Palmer
  • Christopher Tully
  • Daniel Aloni
  • David d'Enterria
  • Diallo Boye
  • Dmitri Denisov
  • Elisa Fontanesi
  • Eluned Smith
  • Emily Thompson
  • Emmanouil Vourliotis
  • Ethan Levy
  • Fabrizio Palla
  • Felix Sefkow
  • Fernando Cornet-Gomez
  • Francesco Giovanni Celiberto
  • Frank E. Taylor
  • Frank Golf
  • Gabriele D'Amen
  • Gabriella Sciolla
  • George Iakovidis
  • George Witt
  • Gerardo Ganis
  • Grace Cummings
  • Graham Wilson
  • Gregorio Bernardi
  • Helmut Marsiske
  • Hong Ma
  • Indara Suarez
  • Isabella Vesely
  • Iza Veliscek
  • Jacob Lee
  • Jaime Heredia Ugedo
  • James Rohlf
  • James Shank
  • James Wetzel
  • Jan Eysermans
  • Jared Maxson
  • Jason Nielsen
  • Jennifer Roloff
  • Jesse Thaler
  • Jim Hirschauer
  • Jinlong Zhang
  • Joel Butler
  • John Parsons
  • John Rutherfoord
  • John Seeman
  • Jordan Lang
  • Joshua Bendavid
  • Juan Miguel Carceller
  • Julia Gonski
  • Julia Thom-Levy
  • Julius Heitkoetter
  • Junjie Zhu
  • Katherine Fraser
  • Kathleen Amm
  • Kellen McGee
  • Kenichi Hatakeyama
  • Kenneth Lane
  • Kristian Praizner
  • Kyungseop Yoon
  • Lindsey Gray
  • Lingfeng Li
  • Lothar Bauerdick
  • Louise Skinnari
  • Loukas Gouskos
  • Luca Lavezzo
  • Manuela Boscolo
  • Marc-André Pleier
  • Marcel Demarteau
  • Marcela Carena
  • Marcus Hohlmann
  • Maria Chamizo-Llatas
  • Mariarosaria D'Alfonso
  • Marina Malta Nogueira
  • Mark Larson
  • Martin Schmaltz
  • Matheus Hostert
  • Mathieu Benoit
  • Mei Bai
  • Michael Benedikt
  • Michael Hance
  • Michael Kagan
  • michelangelo mangano
  • Michele Gallinaro
  • Michiko Minty
  • Mike Williams
  • Mitch Newcomer
  • Mogens Dam
  • Nate Martinez
  • Nicholas Pinto
  • nicola bacchetta
  • Nicolas Morange
  • Nikhil Borse
  • Nural Akchurin
  • Othello Gomes
  • pantaleo raimondi
  • Paolo Giacomelli
  • Patrick Janot
  • Patrizia Azzi
  • Peter Onyisi
  • Peter Wittich
  • Phillip Ionkov
  • Pierre-Hugues Beauchemin
  • Pietro Lugato
  • Prajita Bhattarai
  • Prudhvi Bhattiprolu
  • Pushpa Bhat
  • Rafael Coelho Lopes de Sa
  • Raghav Kansal
  • Rainer Bartoldus
  • Rajeev Singh
  • Randy Ruchti
  • Rashmish Mishra
  • Reinhard Schwienhorst
  • Richard Milner
  • Rikutaro Yoshida
  • Ritchie Patterson
  • Robert Szafron
  • Robert Zwaska
  • Roberto Tenchini
  • Roger Rusack
  • Ryszard Stroynowski
  • Sally Seidel
  • Samuel Homiller
  • Sarah Eno
  • Sarah Waldych
  • scott snyder
  • Sebastian white
  • Seddigheh Tizchang
  • Sergei Chekanov
  • Sergey Belomestnykh
  • Shih-Chieh Hsu
  • Simone Mazza
  • Sophia Scarano
  • Spencer Gessner
  • Srini Rajagopalan
  • Stephane Willocq
  • Suyog Shrestha
  • Syed Haider Abidi
  • THOMAS SCHWARZ
  • Tianyu Justin Yang
  • Tiehui Ted Liu
  • Timothy Martonhelyi
  • TULIKA BOSE
  • Valentina Dutta
  • Valerio Dao
  • Verena Martinez Outschoorn
  • Victor Daniel Elvira
  • Vikas Teotia
  • Viviana Cavaliere
  • Vladimir Shiltsev
  • Wonyong Chung
  • Xueying Lu
  • Yasar Onel
  • Yen-Jie Lee
  • Yikun Wang
  • Yusuf Aamir
  • Yusuf Seday
  • Yuxiang Guo
  • Zeynep Demiragli
  • Zhangqier Wang
  • Zoltan Ligeti
    • 07:30 08:30
      Registration Building 32, 32-123

      Building 32, 32-123

      MIT

    • 08:30 09:00
      Opening Plenary: Welcome to the 2nd U.S. FCC Workshop at MIT! 32-123 (Building 32)

      32-123

      Building 32

      • 08:30
        Welcome to MIT 15m

        The head of the MIT Physics Department will welcome our guest at MIT.

        Speaker: Deepto Chakrabarty (Massachusetts Institute of Technology)
      • 08:45
        Workshop Logistics 15m
        Speaker: Christoph Paus (MIT)
    • 09:00 10:30
      Plenary: Vision, P5 Report and FCC Status Building 32, 32-123

      Building 32, 32-123

      MIT

      Conveners: Alessandro Tricoli (BNL), Christoph Paus (staff@mit.edu), Sarah Eno (U. Maryland)
    • 10:30 11:00
      Coffee break 30m Building 32, 32-123

      Building 32, 32-123

      MIT

    • 11:00 12:30
      Plenary: Detector Concepts Building 32, 32-123

      Building 32, 32-123

      MIT

      Conveners: Marc-André Pleier (Brookhaven National Laboratory), Martin Aleksa (CERN)
    • 11:00 12:30
      Theory Brainstorming about FCC Building 32, 32-124

      Building 32, 32-124

      MIT

    • 14:00 15:40
      Plenary: Synergies in Machines, Detectors, Software and Theory Building 32, 32-123

      Building 32, 32-123

      MIT

      Conveners: Anadi Canepa (FNAL), Ayres Freitas (University of Pittsburgh)
    • 15:40 16:10
      Coffee break and US FCC Workshop Photo 30m Building 32, 32-123

      Building 32, 32-123

      MIT

    • 16:10 16:40
      Plenary: Synergies in Machines, Detectors, Software and Theory: Part 2 Building 32, 32-123

      Building 32, 32-123

      MIT

      • 16:10
        Synergies: Theory Overview 30m
        Speaker: Matthew McCullough (CERN)
    • 16:40 18:10
      Plenary: Reports from DOE and NSF and Panel Discussion Building 32, 32-123

      Building 32, 32-123

      MIT

      Conveners: Sally Seidel (University of New Mexico), Srini Rajagopalan (BNL)
      • 16:40
        Introductory Remarks 10m
        Speaker: Srini Rajagopalan (BNL)
      • 16:50
        Panel Discussion with Haider Abidi (BNL), Tulika Bose (Wisconsin), Caterina Vernieri (Stanford), Robert Zwaska (FNAL), Chris Tully (Princeton), Michael Benedikt (CERN), Patrick Janot (CERN), Abid Patwa (DOE), Jim Shank (NSF) 1h 10m

        Panel member include
        Haider Abidi (BNL),
        Tulika Bose (Wisconsin),
        Caterina Vernieri (Stanford),
        Robert Zwaska (FNAL),
        Chris Tully (Princeton),
        Michael Benedikt (CERN),
        Patrick Janot (CERN),
        Abid Patwa (DOE),
        Jim Shank (NSF)

        Speaker: TBD
    • 18:30 20:30
      Social events: Workshop Reception Grier Room, Building 34, 34-401A/B

      Grier Room, Building 34, 34-401A/B

      MIT

      • 18:30
        Reception with Poster Session 1h 30m

        In parallel to the reception we invite people to study the posters exhibited during the reception in the venue.

        For more study they will be transported to the workshop foyer and will be available for day 2 and 3 of the workshop.

      • 20:00
        Measurement of Higgs decays to a bottom quark pair 5m

        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 to fermions and in particular the b quark. We present an analysis that outlines the key steps including a first take at the leading uncertainties.

        Speakers: Cailtlin Kubina (University of Maryland), Jacob Lee (University of Maryland), Joshua Robbins (University of Maryland), Sarah Waldych (University of Maryland)
      • 20:05
        Search for Higgs boson decaying to a Z boson and a photon 5m

        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 response is simulated at the IDEA detector. The decay channels are divided into four categories based on the final states of the two Z bosons ($4q$, $2q2l$, $4l$, and invisible). For each category, a selection method based on kinematic cuts and Boosted Decision Trees (BDTs) is employed to reduce the background processes, primarily the diboson (ZZ and WW) background. An uncertainty on the coupling constant $\kappa_{Z\gamma}$ is quoted for each category.

        Speakers: Charlotte Myers (UMD), Peyton Musembi (UMD), Rujuta Sane (MIT), Yusuf Aamir (UMD)
      • 20:10
        Study of dimuon production a the Z pole 5m

        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 verify our simulation and compare existing Monte Carlo generators, Whizard, KKMCee, and ReneSCANCe.

        Speakers: Chinar Deshpande (MIT), Saina Deshpande (MIT), Satvik Manjigani (University of Maryland)
      • 20:15
        Comparison of Two Photon Monte Carlo generators at the FCC 5m

        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 and hadronic cross-sections. The two-photon background is of particular interest due to simulation difficulties of the γγ → hadron-hadron processes. We primarily study various kinematic variables for simulations of e+e− → γγ → e+e− + µµ interactions. We extend this analysis to e+e− → e+e− + hadrons interactions.

        Speakers: Aneesh Anandanatarajan (University of Maryland), George Witt (University of Maryland), Othello Gomes (University of Maryland)
      • 20:20
        Tau lepton decay identification and polarization measurements at FCC-ee 5m

        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 Carlo study in the FCC-ee framework on the tau polarization at the center-of-mass energy of 91.2 GeV. Boosted decision trees (BDTs) are applied to optimize the identification of the 1-prong and 3-prong tau decay modes. These are then used to derive measurements of the tau polarization by fitting to analytical energy distributions.

        Speakers: Isabella Vesely (MIT), Tim Neumann (student@mit.edu)
      • 20:25
        Measurement of W mass through kinematic analysis of its decay products 5m

        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 determine the value of the W mass. The W boson mass and uncertainty are extracted from the decay products, the missing momentum and the kinematic constraints of the initial state.

        Speakers: Jaime Ugedo (University of Maryland), Kristian Praizner (MIT), Nate Martinez (MIT), Noreldaim Ayman (MIT)
    • 08:30 10:00
      Parallel: Accelerator and Machine Detector Interface (MDI) Building 32, 32-123

      Building 32, 32-123

      MIT

      Conveners: Tor Raubenheimer (SLAC), Vladimir Shiltsev (FNAL)
    • 08:30 10:25
      Parallel: Computing and Software Tutorials Building 32, 32-124

      Building 32, 32-124

      MIT

    • 10:00 10:30
      Coffee break 30m Building 32, 32-123

      Building 32, 32-123

      MIT

    • 10:30 12:32
      Parallel: Detectors: Part 1 Building 32, 32-123

      Building 32, 32-123

      MIT

      Conveners: Alessandro Tricoli (BNL), Sergei Chekanov (ANL)
      • 10:30
        Overview of Tracking and Timing Detector technologies for the FCC-ee detector 20m
        Speaker: Carl Haber (LBNL)
      • 10:50
        Design, performance and future prospects for a vertex detector for FCC 17m
        Speaker: Fabrizio Palla
      • 11:07
        Development of precision tracking and quantum detectors at Fermilab 17m
        Speaker: Artur Apresyan (Fermilab)
      • 11:24
        MIT PixElPhi: a Pixel lab for ELementary Physics at MIT 15m

        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 the digital design, sensor characterization, and mechanical tests for the future Silicon Vertex Detector (SVT) of the ePIC experiment at the Electron-Ion Collider at the LHC. The future SVT detector will use bent and staved MAPS sensors in 65 nm CMOS imaging technology to build the most advanced MAPS-based detector so far developed. The MAPS-based detector technology developed in this lab for the SVT detector represents an ideal choice for the vertexing and tracking system of a future FCC experiment.

        Speaker: Gian Michele Innocenti (Massachusetts Institute of Technology)
      • 11:39
        Towards robust PICOSEC Micromegas precise timing detectors 17m
        Speaker: Sebastian White (University of Virginia)
      • 11:56
        High Segmentation, Radiation-Hard Calorimetry Options for FCC 17m
        Speakers: Yasar Onel (University of Iowa), Yasar Onel (University of Iowa)
      • 12:13
        Overview of TDAQ 19m
        Speaker: Zeynep Demiragli
    • 10:30 12:30
      Parallel: Theory and Experiment: Part 1 Building 32, 32-124

      Building 32, 32-124

      MIT

      Conveners: Patrizia Azzi (Padova), Robert Szafron (BNL)
      • 10:30
        Beam-induced background simulation studies for FCC 20m

        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 concept geometry, originally developed for the International Linear Collider (ILC), using the DD4HEP toolkit. Our studies demonstrate that FCC background rates are compatible with multiple detector concepts and enable further detector optimizations in order to maximize the precision of important measurements, e.g. the Higgs self-coupling. This highlights synergies between all Higgs Factory detector R&D efforts and shows the power of common software tools to enable physics studies for proposed future accelerators.

        Speaker: Casey Lawson (MIT)
      • 10:50
        Opportunities and Challenges of the Hadron Cross Section at the Z pole 20m

        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.

        Speaker: Marina Malta Nogueira (student@mit.edu)
      • 11:10
        Alpha_s 20m
        Speaker: Iain Stewart (Massachusetts Institute of Technology)
      • 11:30
        High Multiplciity e+e- collisions 20m

        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 frontier for investigating high particle density final states.

        The talk will highlight how the FCC, with its significantly higher statistics, provides an unprecedented opportunity to study very high multiplicity events in e+e- collisions.

        Speaker: Yen-Jie Lee (Massachusetts Institute of Technology)
      • 11:55
        [Remote] Study of the jet tagging performance using the ParticleNet tagger for the IDEA vertex detector 15m

        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 resolution, material radiation length and number of layers. Furthermore, an attempt to study impacts in physics applications such as the Z(qq)H and Z(inv)H final states will be shown.

        Speaker: Andrea Sciandra
      • 12:15
        From Optimal Observables to Machine Learning: an Effective-Field-Theory Analysis of $e^+e^- \to W^+W^-$ at Future Lepton Colliders 15m

        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 results with sufficient Monte Carlo simulation samples that accurately describe experiments. This is crucial for the analyses at future lepton colliders given the outstanding precision of the $e^+e^-\to W^+ W^-$ measurement ($\sim \mathcal{O}(10^{-4})$ in terms of anomalous triple gauge couplings or even better) that can be reached. Our framework can be generalized to other effective-field-theory analyses, such as the one of $e^+e^-\to t\bar{t}$ or similar processes at muon colliders.

        Speaker: Lingfeng Li (Brown University)
    • 13:30 15:29
      Parallel: Detectors: Part 2 Building 32, 32-123

      Building 32, 32-123

      MIT

      Conveners: Alessandro Tricoli (BNL), Sergei Chekanov (ANL)
      • 13:30
        Overview of Calorimeter technologies for the FCC-ee detector 17m
        Speaker: Nicolas Morange (Orsay, LAL)
      • 13:47
        Dual-readout calorimetry with homogenous crystals and Precision timing characterization 17m
        Speaker: Grace Cummings (Fermi National Accelerator Laboratory)
      • 14:04
        Geant4 simulations of sampling and homogeneous hadronic calorimeters with dual readout for future colliders 17m
        Speaker: Sergei Chekanov (ANL)
      • 14:21
        Development of a segmented crystal ECAL option for IDEA. 17m
        Speaker: Wonyong Chung (Princeton University)
      • 14:38
        Noble Liquid Endcap EM Calorimeter: Geometry and Simulation. 17m
        Speaker: John Rutherfoord (University of Arizona)
      • 14:55
        Study of time and energy resolution of an ultracompact sampling calorimeter (RADiCAL) module at EM shower maximum over the energy range 25 ≤ E ≤ 150 GeV. 17m
        Speakers: James Wetzel (Coe College), Randy Ruchti (University of Notre Dame)
      • 15:12
        Machine-learning for FCC simulations 15m
        Speaker: Raghav Kansal
    • 13:30 15:30
      Parallel: Theory and Experiment: Part 2 Building 32, 32-124

      Building 32, 32-124

      MIT

      Conveners: Patrizia Azzi (Padova), Robert Szafron (BNL)
      • 13:30
        Higgs physics and detector requirements 15m

        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, we will examine the impact of different detector performances on the overall measurement accuracy.

        Speaker: Loukas Gouskos (Brown university)
      • 13:45
        Prospects for Higgs to invisible at the FCC-ee 15m

        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 if the Higgs boson decays into a pair of weakly interacting massive particles (WIMP), which may explain the nature of dark matter. The FCC-ee is a Higgs factory, with over one million Higgs bosons produced at $\sqrt{s} \sim$ 240 and 365 GeV, which can give access to Higgs decays with branching ratios of a fraction of a per mil. Preliminary studies of the invisible decay channel at FCC-ee are performed in the $Z\rightarrow H$ ($Z \rightarrow ff, H \rightarrow $ invisible) channel. We estimate the sensitivity at $\sqrt(s)=240$ GeV using full CLD simulation for the signal and smaller backgrounds. This is compared to earlier results using fast simulation. In addition, we propose to use the $H\rightarrow $ invisible channel to study the detector performance at the FCC-ee.

        Speaker: Diallo Boye (Brookhaven National Laboratory)
      • 14:00
        Higgs coupling in ZH di-jet and fully hadronic final states 15m

        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 challenges since the jet clustering may create confusion and the assignment of jets to Higgs and Z comes with ambiguities. In this presentation ZH to full hadronic final state analysis using the state of the art jet tagger algorithm will be presented along with results for the precision that can be achieved. Moreover the combined fit results for the Z->inv. And the full hadronic will be shown.

        Speaker: Iza Veliscek (BNL)
      • 14:15
        Constraining CP-odd contributions in the Higgs-strahlung process at FCC-ee using kinematic observables 15m

        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 weights to the Standard Model in order to optimally constrain the CP-odd contributions based on kinematic observables.

        Speaker: Nicholas Pinto (Johns Hopkins University)
      • 14:30
        Sensitivity to BSM fermions from Higgs precision studies 15m

        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 e+e- -> ZH, which is modified by the new fermions at the 1-loop level, and we also comment on the role of Higgs braching fractions and electroweak precision constraints.

        Speaker: Ayres Freitas (University of Pittsburgh)
      • 14:45
        Top Quark Couplings Prospects at Future Lepton Colliders 15m

        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 from a global fit to the top-quark physics sector.

        Speaker: Fernando Cornet-Gomez (Case Western Reserve University)
      • 15:00
        ALPs at the FCC 15m

        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, heavier ALPs can be searched for at future high-energy lepton and hadron colliders. We discuss the reach of the different proposed colliders, focusing on resonant ALP production, ALP production in the decay of heavy SM resonances, and associate ALP production with photons, Z bosons or Higgs bosons. We discuss search strategies for ALPs decaying promptly as well as ALPs with delayed decays. Projections for the FCC-ee and FCC-hh will be presented.

        Speaker: Andrea Thamm (University of Massachusetts Amherst)
    • 15:30 16:00
      Coffee break 30m Building 32, 32-123

      Building 32, 32-123

      MIT

    • 16:00 17:30
      Plenary: Lightning Talks Building 32, 32-123

      Building 32, 32-123

      MIT

      Conveners: Julia Gonski (Stanford), Samuel Homiller (Harvard)
      • 16:00
        ZH Jet Pairing Methods for Higgs Self-coupling Sensitivity Optimization at a Future Higgs Factory 10m

        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 reconstruction algorithm parameters that best identify the Higgs signal. This talk will provide an overview of the unexplored decay channel of ZH→cc bb and prove its value as a process of interest.

        Speaker: Phillip Ionkov (BNL/Columbia University)
      • 16:10
        Integrated CMOS Sensor Development for Future Colliders with a US-Based Foundry 10m

        This talk outlines an innovative program for the first-time development and production of High Energy Physics (HEP)-specific sensors, fully integrated into standard CMOS processes by a US-based foundry. Collaborating with US universities, our project focuses on designing and implementing Monolithic Active Pixel Sensors (MAPS) in 90 nm technology, encompassing test structures, multi-pixel arrays, and CMOS sensors with integrated readout circuits. I will discuss the design process, and prototype development of these detectors for HEP applications, highlighting the potential impact on future collider experiments.

        Speaker: Chris Madrid (Fermilab)
      • 16:20
        Electroweak Phase Transition and Higgs Exotic Decays 10m

        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 a necessary condition for electroweak baryogenesis, a mechanism that explains the baryon asymmetry of the universe. Thus, extending the Higgs sector to accommodate a strongly first order EWPT remains a motivated study for beyond the Standard Model physics. Importantly, the Higgs potential and properties are necessarily modified when new physics degrees of freedom are introduced to couple to the Higgs, leading to potential smoking-gun signals in Higgs searches. In the talk, I will present a concrete model example with a generic singlet extension to the Higgs sector, where there is a firm correlation between the prediction of a light scalar and a strongly first order EWPT. As the SM Higgs can decay into a pair of light scalars, the Higgs exotic decay is a unique channel to probe a broad class of EWPT models featuring light scalars.

        Speaker: Yikun Wang (California Institute of Technology)
      • 16:30
        Dual-readout study with PbF2 crystals 10m

        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 of Cherenkov light, as a first step to study the dual-readout implementation of an electromagnetic calorimeter system.

        Speaker: Yuxiang Guo (University of Michigan)
      • 16:40
        A Simplified Model of Heavy Vector Singlets at the LHC and Future Colliders 10m

        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 will draw on current limits to provide sensitivity projections for future high-energy colliders, discussing the role of the FCC-hh in future heavy resonance searches. The utility of this simplified model is illustrated by matching these results onto three explicit models: one weakly coupled abelian and one weakly coupled non-abelian extension of the Standard Model gauge group, and a strongly coupled minimal composite Higgs model. I will show that under these explicit models, the FCC-hh will constrain beyond the Standard Model vectors far above the reach of the LHC or similar future colliders.

        Speaker: Timothy Martonhelyi (University of Massachusetts Amherst)
      • 16:50
        Isosinglet vectorlike leptons at e+e- colliders 10m

        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 signal regions, and explain how the tau' branching ratios may be measured.

        Speaker: Prudhvi Bhattiprolu (University of Michigan)
      • 17:00
        Long-lived Particles at the FCC-ee with the IDEA and CLD detectors 10m

        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 boson decays at the FCC-ee. Furthermore, we will examine how the IDEA and CLD detector concepts affect the sensitivity to observing these long-lived particles.

        Speaker: Mark Larson (Northeastern University)
      • 17:10
        What can we say about the Higgs self-coupling with the hadronic ZH process at FCC-ee? 10m

        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 Higgs vacuum, while a measurement which disagrees could hint at the existence of new particles. While the Higgs self-coupling cannot be directly measured at FCC-ee due to a collision energy too low for HH production, it can be indirectly measured via single Higgs production. This talk will present projected constraints on the Higgs self-coupling using the fully-hadronic ZH process, taking advantage of the high ZH→hadrons branching ratio and the clean 𝑒+𝑒− collision environment.

        Speaker: Abraham Tishelman-Charny (BNL)
      • 17:20
        Overflow 10m
    • 19:00 21:00
      Social events: Workshop dinner Samberg Conference Center, Chang Building (E52), 6th floor, Dining Room 5 & 6

      Samberg Conference Center, Chang Building (E52), 6th floor, Dining Room 5 & 6

      MIT

    • 08:30 10:30
      Plenary: Expression of Interest: Part 1 Building 32, 32-123

      Building 32, 32-123

      MIT

      Conveners: Christoph Paus (staff@mit.edu), Julia Gonski (Stanford), Robert Szafron (BNL), Srini Rajagopalan (BNL)
      • 08:30
        Southern Methodist University 3m
        Speaker: Ryszard Stroynowski
      • 08:35
        Florida Institute of Technology 3m
        Speaker: Marcus Hohlmann (Florida Institute of Technology)
      • 08:40
        Northern Illinois University 3m
        Speaker: Vladimir Shiltsev
      • 08:45
        Princeton 3m
        Speaker: Wonyong Chung
      • 08:50
        Northeastern 3m
        Speaker: Louise Skinnari
      • 08:55
        Johns Hopkins 3m
        Speaker: Andrei Gritsan
      • 09:00
        University of Virginia 3m
        Speaker: Bob Hirosky (U. Virginia)
      • 09:05
        Boston University 3m
        Speaker: Zeynep Demiragli
      • 09:10
        University of New Mexico 3m
        Speaker: Sally Seidel
      • 09:15
        University of Washington 3m
        Speaker: Shih-Chieh Hsu
      • 09:20
        Cornell (Accelerator Physics) 3m
        Speaker: Jared Maxson
      • 09:25
        Cornell (Physics) 3m
        Speaker: Anders Ryd
      • 09:30
        Michigan State 3m
        Speaker: Reinhard Schwienhorst
      • 09:35
        UMass Amherst 3m
        Speaker: Rafael Coelho Lopes de Sa
      • 09:40
        Texas Tech University 3m
        Speaker: Nural Akchurin
      • 09:45
        University of Iowa 3m
        Speaker: Yasar Onel
      • 09:50
        University of Pittsburgh 3m
        Speaker: Joseph Boudreau
      • 09:55
        Purdue University 3m
        Speaker: Andy Jung
      • 10:00
        Carnegie Mellon 3m
        Speaker: Valentina Dutta
      • 10:05
        University of Minnesota 3m
        Speaker: Roger Rusack
      • 10:10
        Brandeis 3m
        Speaker: Aram Apyan
      • 10:15
        Ohio State University 3m
        Speaker: K. K. Gan
      • 10:20
        Discussion/Overflow 10m
    • 10:30 11:00
      Coffee break 30m Building 32, 32-123

      Building 32, 32-123

      MIT

    • 11:00 13:00
      Plenary: Expression of Interest: Part 2 Building 32, 32-123

      Building 32, 32-123

      MIT

      Conveners: Christoph Paus (staff@mit.edu), Julia Gonski (Stanford), Robert Szafron (BNL), Srini Rajagopalan (BNL)
      • 11:00
        Columbia 3m
        Speaker: John Parsons
      • 11:05
        MIT 3m
        Speaker: Christoph Paus (MIT)
      • 11:10
        University of Maryland 3m
        Speaker: Chris Palmer
      • 11:15
        University of Texas Austin 3m
        Speaker: Peter Onyisi
      • 11:20
        Tufts 3m
        Speaker: Hugo Beauchemin
      • 11:25
        UC Santa Cruz 3m
        Speaker: Jason Nielsen
      • 11:30
        University of Michigan 3m
        Speaker: Tom Schwarz
      • 11:35
        University of California Irvine 3m
        Speaker: Anyes Taffard
      • 11:40
        Stony Brook 3m
        Speaker: Valerio Dao
      • 11:45
        Caltech 3m
        Speaker: Ren-Yuan Zhu
      • 11:50
        University of Arizona 3m
        Speaker: John Rutherfoord
      • 11:55
        Duke 3m
        Speaker: Ashutosh Kotwal
      • 12:00
        Brown 3m
        Speaker: Loukas Gouskos
      • 12:05
        University of Kansas 3m
        Speaker: Graham Wilson
      • 12:10
        Argonne 3m
        Speaker: Alexander Paramonov
      • 12:15
        Brookhaven (Physics) 3m
        Speaker: Haider Abidi
      • 12:20
        Brookhaven (Accelerator Physics) 3m
        Speaker: Marc-André Pleier
      • 12:25
        Fermilab (Physics) 3m
        Speaker: Anadi Canepa
      • 12:30
        Fermilab (Accelerator Physics) 3m
        Speaker: Anadi Canepa
      • 12:35
        LBNL 3m
        Speaker: Carl Haber
      • 12:40
        Oak Ridge 3m
        Speaker: Mathieu Benoit
      • 12:45
        SLAC (Physics) 3m
        Speaker: Prajita Bhattarai
      • 12:50
        SLAC (Accelerator Physics) 3m
        Speaker: Spencer Gessner
      • 12:55
        Discussion/Overflow 5m
    • 14:00 15:40
      Plenary: Closeout Building 32, 32-123

      Building 32, 32-123

      MIT

      Conveners: Alessandro Tricoli (BNL), Sarah Eno (Maryland)