Roadmap of Dark Matter models for Run 3

Europe/Zurich
40/S2-D01 - Salle Dirac (CERN)

40/S2-D01 - Salle Dirac

CERN

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Daniel Johnson (University of Birmingham (GB)), Deborah Pinna (University of Wisconsin Madison (US)), James Frost (University of Oxford (GB)), Matteo Cremonesi (Carnegie-Mellon University (US)), Spyros Argyropoulos (Albert Ludwigs Universitaet Freiburg (DE)), Tim M.P. Tait (University of California, Irvine), Uli Haisch, Xabier Cid Vidal (Instituto Galego de Física de Altas Enerxías), Zirui Wang (University of Michigan (US))
Description

The main goals of this workshop are to discuss

  • signatures which have not been explored (or only poorly explored) until Run 2 (new final states, final states with unusual objects, final states which require developing new triggers/selections/experimental techniques)
  • ways to improve the interpretations of currently used DM benchmarks (update of parameter scans, new parameter scans, etc.)
  • interplay with other experiments (LLP, low-mass signatures, etc.)
 
Videoconferencing
 
To access the zoom link and password you have to log in with your CERN credentials. The zoom link is accessible via the left menu under "Videoconferencing" or by clicking on "Timetable (indico style)".
 
Workshop dinner
 
The workshop dinner will take place on May 15th at CAFÉ HORTUS (https://cafehortus.ch/), just a short two-stop tram ride away from CERN.
Both regular and vegan menus are available. 
 
Please be aware that the restaurant does not accept separate payments for menu options. For colleagues who have completed the survey (https://indico.cern.ch/event/1340162/surveys/5247) and selected their menu options, we kindly request that they bring cash (65 CHF per person) for payment at the beginning of Tuesday morning sessions to Zirui Wang.
 
Access to the CERN site
Visitor badges will be provided automatically to people who do not have a CERN access card. Please indicate in the registration form whether you will need a badge.
 
Fees
The workshop is cost-free.
 
Travel and accommodation
Please make your own travel arrangements and book your accommodation early on. 
Note: If you receive any email offering you accommodation for the event, e.g. from "Global Travel Experts" please ignore it - this is a well-known scam targeting registrants of indico events.
 
Videoconference
Roadmap of Dark Matter models for Run 3
Zoom Meeting ID
69052260764
Host
Spyros Argyropoulos
Useful links
Join via phone
Zoom URL
Registration
Registration form
Participants
  • Aaron White
  • Aashaq Shah
  • Abhijith Gandrakota
  • Abhishek Roy
  • Adil Jueid
  • Adrian Casais Vidal
  • Albert De Roeck
  • Alejandro Ibarra
  • Alexander Grohsjean
  • Alexander Moreno Briceño
  • alexander pukhov
  • Alexandre Arbey
  • Aman Desai
  • Ana Peixoto
  • Andre Frankenthal
  • Andre Lessa
  • Andrea Malara
  • Andreas Korn
  • Anindya Ghosh
  • Apoorva Shah
  • Aran Garcia-Bellido
  • Audrey Katherine Kvam
  • Benedikt Maier
  • Benjamin Fuks
  • Bryan Cardwell
  • Caroline Collard
  • Caterina Doglioni
  • Cesare Cazzaniga
  • Changqiao Li
  • Cheng Jiang
  • Christian Appelt 🦆
  • Christian Schwanenberger
  • Christopher Madrid
  • Daniele Barducci
  • Danijela Bogavac
  • David Cutts
  • David d'Enterria
  • David Yu
  • Debasish Das
  • Deepak Kar
  • Diallo Boye
  • Dieter Horns
  • Dilia Maria Portillo Quintero
  • DMITRY BUDKER
  • Dominic William Stafford
  • Dominique Trischuk
  • Doomnull Attah Unwuchola
  • Dr. Atri Dey
  • Edmanferson Holanda
  • Elisa Fontanesi
  • Emanuele Angelo Bagnaschi
  • Erdem Yigit Ertorer
  • Farida Fassi
  • Federica Piazza
  • Felix Yu
  • Florian Eble
  • Genevieve Belanger
  • Giorgio Arcadi
  • Giuliano Gustavino
  • Greg Landsberg
  • Gudrid Moortgat-Pick
  • Guglielmo Frattari
  • Gustavo Gil Da Silveira
  • Halil Saka
  • Hannah Van Der Schyf
  • Hassnae El Jarrari
  • Henning Flaecher
  • Hyun Min Lee
  • Ido Elbaz
  • Ilia Kalaitzidou
  • Isabel Beth Carr
  • Ishtiaq Ahmed
  • Jackson Carl Burzynski
  • James Frost
  • James Pinfold
  • Jan Heisig
  • Janna Katharina Behr
  • Jannicke Pearkes
  • Jayita Lahiri
  • Jigar Patel
  • Jnanadeva maharana
  • Joschka Birk
  • Jose Miguel No
  • Joseph Reichert
  • Judita Mamuzic
  • Julia Manuela Cardoso Silva
  • Julian Friedrich Wack
  • Juliette Alimena
  • Kai Ma
  • Katherine Pachal
  • Khawla Jaffel
  • Kinga Anna Wozniak
  • Kirtimaan Mohan
  • Konstantin Zioutas
  • Konstantin Zioutas
  • Kotaro Saito
  • Kristin Dona
  • Kristof Schmieden
  • Lisa Benato
  • Long Wang
  • Lorenzo Marafatto
  • Louie Dartmoor Corpe
  • Luca Panizzi
  • Lydia Beresford
  • Manimala Mitra
  • Marcella Bona
  • Marco Rimoldi
  • Maria Savina
  • Marios Maroudas
  • Marta Felcini
  • Mason Proffitt
  • Matteo Bauce
  • Maximilian Amerl
  • Mike Williams
  • Myeonghun Park
  • Márcio Mateus Jr
  • Navneet Krishnan
  • Ning Zhou
  • Oleg Brandt
  • Ophir Ruimi
  • Patrick Ecker
  • Patrick Fox
  • Patrick Rieck
  • Philip Coleman Harris
  • Philip Ilten
  • Priscilla Pani
  • Pyungwon Ko
  • Rhitaja Sengupta
  • Roberto Salerno
  • rocio vilar cortabitarte
  • Rocky Bala Garg
  • Roy Cruz Candelaria
  • Rui Zhang
  • Saashiv Valjee
  • safa gaid
  • Sandeep Bhowmik
  • Sanmay Ganguly
  • Sarmad Masood Shaheen
  • Sebastian Olivares
  • Shin-Shan Yu
  • Shivani Lomte
  • Silvia Resconi
  • Sohaib Hassan
  • Spyros Argyropoulos
  • Stefania Gori
  • Suchita Kulkarni
  • Sukanya Sinha
  • Sweta Baradia
  • Tania Robens
  • Taylor Murphy
  • Tetiana Moskalets
  • Thiago Rafael Tomei Fernandez
  • Thomas Biekötter
  • Tim Cohen
  • William Shepherd
  • Yalcin Guler
  • Yang Bai
  • Yoxara Sánchez Villamizar
  • Yuan-Tang Chou
  • Zirui Wang
  • +71
Contact all organisers & session chairs
    • 9:00 AM 2:00 PM
      Arrival
    • 2:00 PM 2:10 PM
      Welcome
    • 2:10 PM 6:20 PM
      LLP signatures
      Conveners: Dean Robinson (Lawrence Berkeley National Laboratory (LBL)), Juliette Alimena (DESY), Dr Louie Corpe (Laboratoire de Physique Clermont Auvergne (LPCA))
      • 2:20 PM
        LLP-DM overview: linking searches to models, and LLP experiment reach for DM model space 25m
        Speaker: David Curtin (University of Toronto)
      • 2:55 PM
        Multiple track signatures 15m
        Speaker: Jackson Carl Burzynski (Simon Fraser University (CA))
      • 3:20 PM
        Signatures with MET 15m
        Speaker: Joseph Reichert (Rutgers State Univ. of New Jersey (US))
      • 3:45 PM
        Pair-produced LLPs (to jets, leptons, photons...) 15m
        Speaker: Audrey Katherine Kvam (University of Massachusetts (US))
      • 4:10 PM
        Coffee break 30m
      • 4:45 PM
        Mass-independent searches 15m
        Speaker: Christina Wenlu Wang (California Institute of Technology (US))
      • 5:05 PM
        Recasting wishlist 15m
        Speakers: Prof. Andre Lessa (CCNH - Univ. Federal do ABC), Andre Lessa (IFGW - UNICAMP)
      • 5:30 PM
        Update on the CODEX-b Experiment 12m

        The High Luminosity LHC will be a tremendous opportunity to search for long lived particles (LLPs) from an extended hidden/dark sector, feebly connected to the known SM sector. Such LLP searches will require special detectors, placed far away from the proton-proton collision point and shielded against SM backgrounds. The CODEX-b detector, to be placed behind a thick shielding wall inside the LHCb cavern, around 25m from the LHCb interaction point, provides a novel solution. On the journey to construction of the full detector, a demonstrator (CODEX-𝛽) is foreseen for installation and operation during LHC Run 3. This talk will present the latest developments and will focus on the status and plans for CODEX-𝛽.

        Speaker: Louis Henry (EPFL - Ecole Polytechnique Federale Lausanne (CH))
      • 5:50 PM
        Discussion 30m
        Speaker: Dr Louie Dartmoor Corpe (Laboratoire de Physique Clermont Auvergne (LPCA))
    • 9:00 AM 12:30 PM
      Unexplored signatures & wildcard ideas
      Conveners: Alexander Grohsjean (Hamburg University (DE)), Giuliano Gustavino (Sapienza Universita e INFN, Roma I (IT)), Monika Blanke (Karlsruhe Institute of Technology)
      • 9:00 AM
        A smoking gun signature of the 3HDM [20+10] 30m
        Speaker: Dr Atri Dey (Dublin Institute for Advanced Studies)
      • 9:30 AM
        Fermionic Portal to Vector Dark Matter [20+10] 30m

        We suggest a new class of models - Fermionic Portal Vector Dark Matter (FPVDM) which extends the Standard Model (SM) with SU(2)_D dark gauge sector. While FPVDM does not require kinetic mixing and Higgs portal. It is based on the Vector-Like (VL) fermionic doublet which couples the dark sector with the SM sector through the Yukawa interaction. The FPVDM framework provides a vector Dark Matter (DM) with Z_2 odd parity ensuring its stability. Multiple realisations are allowed depending on the VL partner and scalar potential, which explain not only DM but also could provide solutions of various BSM hints, including (g-2)_mu, flavour anomalies, W-boson mass measurement by CDF, etc.

        Two examples will be discussed. One of them is the FPVDM realisation with only a VL top partner, which provides interesting and promising implications for DM direct and indirect detection experiments, relic density and collider searches. Another realisation of the FPDM framework with a doublet of new vector-like partners of muon can simultaneously explain DM relic density together with (g-2)_mu anomaly which has been in close focus of the HEP community over two decades. It predicts the mass of vector DM to be below GeV as well as the mass of the muon partner to be below 1 TeV, and provides novel multi-lepton signatures at the LHC.

        The talk is based on 2203.04681, 2204.03510 arXiv papers as well as the new one which is coming this March-April.

        Speaker: Prof. Alexander Belyaev (University of Southampton & Rutherford Appleton Laboratory)
      • 10:00 AM
        Inelastic Dark Matter at the LHC Lifetime Frontier [20+10] 30m
        Speaker: Max Fieg (University of California Irvine (US))
      • 10:30 AM
        Search for Dark Matter with Anomaly Detection Techniques [20+10] 30m
        Speaker: Thea Aarrestad (ETH Zurich (CH))
      • 11:00 AM
        Coffee Break 30m
      • 11:30 AM
        Production of Kaluza-Klein States at LHC and Implication for Dark Matter [12+3] 15m

        t has been proposed that, in the large radius compactification (LRC) scenario, the Kaluza-Klein states might be considered as dark matter (DM) candidates. The universal extra dimension (UED) hypothesis, together with the LRC paradigm, holds the prospect of observing KK states at LHC if masses lie in the accessible LHC energy scale. If observed, they might be possible DM candidates, provided LKP is protected by a conservation law not to decay to SM particles. This work is based on axiomatic field theory approach to derive upper bound on production cross sections and bounds on near forward differential cross sections. These bounds are obtained without appealing to perturbation theory, i.e. cross-section bounds are obtained nonperturbatively. The bounds are based on principles of local field theories such as Lorentz invariance, causality and uniqueness of vacuum (respected by all local field theories). We shall depict the growth properties of relevant cross sections as a function of energy. It is speculated that KK states might be observed in cosmic ray experiments.

        Speaker: Jnanadeva Maharana (National Institute of Science Education and Research (IN))
      • 11:45 AM
        Search for Anti Quark Nuggets via their interaction with the LHC beam: A reanalysis of stored data from the 4000 LHC monitors [12+3] 15m

        Anti-quark nuggets, AQNs, (ZHITNITSKY, 2003), have been suggested to solve the dark matter (DM) and the missing antimatter problem in the universe, and have been proposed as an explanation of various observations.

        Their size is in the μm range and their density equal to the nuclear density with an expected flux of about 1 / km2 / year. For the typical velocity of DM constituents (~250 km/s), the solar system bodies act as highly performing gravitational lenses; Here we assume that DM streams or clusters are impinging, e.g., on the Earth, as was worked out for DM axions and WIMPs.

        Interestingly, in the LHC beam, unforeseen beam losses are triggered by so-called UFOs (Unidentified Falling Objects), which are believed to be constituted of dust particles with a size in the μm range and a density several orders of magnitude lower than AQNs.

        Prezeau suggested that streaming DM constituents incident on the Earth should result in jet-like structures (“hairs”) exiting the Earth. Such ideas open up novel directions in the search for DM.

        This talk suggests a new analysis of the UFO results at the LHC, assuming that they are eventually, at least partly, due to AQNs. Specifically, a reanalysis of the existing data from the ~4000 beam monitors since the beginning of the LHC is proposed, arguing that dust and AQNs should behave differently. The feasibility of this idea has been discussed with three CERN accelerator experts and other collaborators.

        Speaker: Konstantin Zioutas (University of Patras (GR))
      • 12:00 PM
        The Triggerless Search for Exotic DM at Run-3 with the MoEDAL-MAPP Experiment [12+3] 15m

        The MoEDAL-MAPP experiment at Run-3 incorporates the MoEDAL and MAPP-1 (MoEDAL Apparatus for Penetrating Particles) detectors deployed at IP8 and in the UA83 tunnel on the LHC Ring, respectively. The passive, triggerless, MoEDAL detector has been taking data at Run-1 and Run-2 and is a world leader in the direct search for Highly Ionizing Particles (HIPs) at a Collider. HIP avatars of new physics include several exotic dark matter candidates including magnetic monopoles, Q-balls, nuclearites, microscopic black-hole remnants and lepton-like multi-charged constituents of composite dark matter, etc.

        The MAPP-1 detector is currently being installed on the LHC ring and is primarily designed to search for Weakly Ionizing Particle (WIPs) messengers of new physics. However, it also has sensitivity to very long-lived charged and neutral particles (LLPs) exemplars of physics beyond the Standard Model, decaying to charged and photonic states. The MAPP-1 data acquisition rate is low enough that all data can be stored subject to optional “software a trigger” cuts. In this sense MAPP-1 is triggerless. The MAPP-1 detector will also be used in the search for exotic DM messengers of new physics such as: millicharged particles, light neutralinos and sterile neutrinos.

        Speaker: James Pinfold (University of Alberta (CA))
      • 12:15 PM
        Wrap-up and Discussion 15m
        Speaker: Spyros Argyropoulos (Albert Ludwigs Universitaet Freiburg (DE))
    • 12:30 PM 2:00 PM
      Lunch break
    • 2:00 PM 6:05 PM
      s-channel mediators and Higgs to invisible
      Conveners: Katherine Pachal (TRIUMF (CA)), Patrick James Fox, Philip Coleman Harris (Massachusetts Inst. of Technology (US))
      • 2:00 PM
        ATLAS Higgs to invisible plans and summary 20m
        Speaker: Diallo Boye (Brookhaven National Laboratory)
      • 2:30 PM
        CMS Higgs to invisible plans and summary 20m
        Speaker: Andrea Malara (Universite Libre de Bruxelles (BE))
      • 3:00 PM
        ATLAS & CMS legacy s-channel results 20m
        Speaker: Matteo Bauce (Sapienza Universita e INFN, Roma I (IT))
      • 3:30 PM
        New experimental directions for s-channel 20m
        Speaker: David Yu (University of Nebraska Lincoln (US))
      • 4:00 PM
        Coffee break 30m
      • 4:30 PM
        EFT theory for Higgs to invisible 20m
        Speaker: Prof. Pyungwon Ko (KIAS (Korea Institute for Advanced Study))
      • 5:00 PM
        Beyond the Dark matter effective field theory and a simplified model approach at colliders 15m

        In this talk, I will review the importance of "Gauge invariance" in the search for Dark matter at the High Energy Collider including LHC.

        The major topics I will include will be
        1) The limit of effective field theory / simplified model approach at the High Energy collider
        2) Dark matter showering at the High Energy collider

        Speaker: Prof. Myeonghun Park (Seoultech)
      • 5:25 PM
        Is the light neutralino thermal dark matter in the pMSSM ruled out? 15m

        We explore the parameter space of the phenomenological Minimal Supersymmetric Standard Model (pMSSM) with a light neutralino thermal dark matter (M ̃χ01 ≤ Mh/2) that is consistent with current collider and astrophysical constraints. We identify that a narrow region with light Higgsinos having masses between 125-160 GeV survives the present constraints for the μ < 0 scenario, including the electroweakino searches implemented in recast frameworks like SModelS and CheckMATE, where μ is the Higgsino mass parameter. This hints towards either a gap in the present LHC searches or the unavailability of its proper recasting. We select benchmarks from this region, and our analysis using the machine learning framework of XGBOOST shows that these are well within the reach of the Run-3 of LHC, and dedicated efforts to probe this region should be pursued. We observe that the recent experimental results from the LHC and direct detection searches for dark matter by the LUX-ZEPLIN collaboration put the μ > 0 scenario under severe tension. We further investigate the impact of light staus on the parameter space, provide benchmarks that can be interesting for Run-3 of LHC, and analyse these benchmarks at the LHC using XGBOOST. Finally, we also discuss the effect of non-standard cosmology on the parameter space.

        Speaker: Rhitaja Sengupta (BCTP and Physikalisches Institut der Universität Bonn, Germany)
      • 5:50 PM
        Darkonia at Colliders 15m

        Dark matter bound states may exist within the dark sector, characterized by a substantial dark force. Depending on the spins and parity properties of the force carriers, Standard Model particles may primarily couple with either the lowest or excited bound states. We discuss the associated collider signatures at the LHC for various simplified models.

        Speaker: Yang Bai
    • 9:00 AM 1:00 PM
      Extended Higgs sectors
      Conveners: Priscilla Pani (Deutsches Elektronen-Synchrotron (DE)), Uli Haisch
      • 9:00 AM
        Experimental introdution to extended higgs models: an ATLAS perspective (20'+10') 30m
        Speaker: Janna Katharina Behr (Deutsches Elektronen-Synchrotron (DE))
      • 9:30 AM
        Experimental introdution to extended higgs models: a CMS perspective (20'+10') 30m
        Speaker: Danyer Perez Adan (RWTH Aachen University (DE))
      • 10:00 AM
        Theory introduction to extended higgs models: a collider perspective (20'+10') 30m
        Speakers: Jose Miguel No Redondo (Conseil Europeen Recherche Nucl. (CERN)-Unknown-Unknown), Jose Miguel No Redondo
      • 10:30 AM
        Theory introduction to extended higgs models: a dark matter phenomenology perspective (20'+10') 30m
        Speakers: Giorgio Busoni (The University of Melbourne), Giorgio Busoni (The Australian National University)
      • 11:00 AM
        coffee break 30m
      • 11:30 AM
        Extended Higgs Sector in Singlet-Triplet Fermionic Model for Dark Matter and Neutrino Mass (12'+3') 15m
        Speaker: Dr Manimala Mitra (Institute of Physics (IOP))
      • 12:00 PM
        Novel signatures in the Type-I 2HDMa model (12'+3') 15m

        The 2HDMa model is one of the main models used in the Dark Matter searches at the LHC. So far, all the 2HDMa benchmarks used by the LHC experiments feature a Type-II Yukawa sector with degenerate Higgses ($m_A=m_H=m_{H^{\pm}}$). The latter implies, together with the fact that flavour observables put lower bounds on the mass of the charged Higgses, that the $A/H/H^{\pm}$ bosons are all constrained to be heavy ($\gtrsim 600$ GeV).
        In this talk, we present the first detailed study of a 2HDMa model with a Type-I Yukawa sector, which, for moderate values of $\tan\beta$, lifts the constraints from flavour observables, allowing the extra Higgs bosons to be even lighter than the SM Higgs boson. We discuss four benchmarks with degenerate and non-degenerate Higgses and the signatures that arise in this model, some of which have not yet been explored by the LHC experiments. The talk will present the dominant channels in these benchmarks and the expected sensitivity in Run 2 data using a truth-level analysis and will discuss potential improvements in the experimental searches for Run 3.

        Speaker: Ilia Kalaitzidou (Albert Ludwigs Universitaet Freiburg (DE))
      • 12:15 PM
        Panelist discussion (invited speakers + session chairs) (45') 45m
        Speaker: Spyros Argyropoulos (Albert Ludwigs Universitaet Freiburg (DE))
    • 1:00 PM 2:00 PM
      Lunch break
    • 2:00 PM 6:00 PM
      Low mass signatures, ALPs, dark photons
      Conveners: J Michael Williams (Massachusetts Inst. of Technology (US)), Philip Ilten (University of Cincinnati (US)), Zirui Wang (University of Michigan (US))
    • 9:00 AM 12:30 PM
      t-channel mediators
      Conveners: Benedikt Maier (KIT - Karlsruhe Institute of Technology (DE)), Benjamin Fuks
    • 12:30 PM 2:00 PM
      Lunch break
    • 2:00 PM 6:00 PM
      Dark Higgs
      Conveners: Felix Kahlhoefer (Karlsruhe Institute of Technology), Matteo Cremonesi (Carnegie-Mellon University (US))
      • 2:00 PM
        Theory and Motivation of dark Higgs Bosons [25+5] 30m
        Speaker: Dr Giorgio Arcadi (University of Messina (Italy))
      • 2:30 PM
        Searches for Dark Higgs Bosons at ATLAS [15+5] 20m
        Speaker: Mr Changqiao Li (Max Planck Society (DE))
      • 2:50 PM
        Searches for Dark Higgs Bosons at CMS [15+5] 20m
        Speakers: Alicia Calderon Tazon (Universidad de Cantabria and CSIC (ES)), Alicia Calderon tazon
      • 3:10 PM
        Review of Benchmark Models Used for Z'+MET Searches [15+5] 20m

        We present a review of the models used for the search for a new leptonically decaying neutral vector boson in association with missing transverse energy by ATLAS, which was published as a conference note (ATLAS-CONF-2023-045) in August 2023. Three signal regions were defined as bins in the $\text{E}_\text{T}^{\text{miss}}$ significance, and the search was performed by scanning across the dilepton invariant mass spectrum in each of these regions. No significant excess above the expected Standard Model background was observed, and limits were set on two benchmark models referred to as light-vector and dark-Higgs. It has been established that the particular benchmarks used in this search do not reproduce the observed dark-matter relic density, and we investigate possibilities for adjusting the models to satisfy the relic-density constraints. We also consider the impact on these models from other search constraints, in particular the $s$-channel constraints from the dark-matter summary effort by ATLAS (ATL-PHYS-PUB-2023-018), which for example includes limits from the inclusive dilepton and dijet searches. Plans are also made to provide fiducial cross-section limits for the signal regions used in the search in order ease reinterpretations of the search, but it is at the moment unclear if these limits will be available in time for this presentation.

        Speaker: Even Simonsen Haaland (University of Oslo (NO))
      • 3:30 PM
        Coffee break 30m
      • 4:00 PM
        Searches for Extra Higgs Bosons and the 95 GeV Excess [25+5] 30m
        Speaker: Thomas Biekötter
      • 4:30 PM
        Light Higgs Bosons ATLAS+CMS [15+5] 20m
        Speaker: Pallabi Das (Princeton University (US))
      • 4:50 PM
        Search for inelastic dark matter in association with a dark Higgs boson at Belle II [15+5] 20m

        Belle II has a unique reach for a broad class of models that postulate the existence of dark matter particles in the MeV-GeV mass range. One scenario is a model which involves inelastic dark matter, consisting of two dark matter states with a mass splitting between them and the presence of a dark Higgs boson. This model has a signature of up to two displaced vertices, one from the resonant decay of the dark Higgs and another non-resonant one emerging from the decay of the involved dark matter particles. This talk will present studies of an ongoing search for such signatures using Belle II simulation, which is not only challenging due to the presence of displaced vertices but also because of the seven-dimensional parameter space of the model.

        Speaker: Patrick Ecker
      • 5:10 PM
        Discussion Session - Presentation of Dark Higgs Results 50m
        Speaker: Felix Kahlhoefer (Karlsruhe Institute of Technology)
    • 9:00 AM 1:00 PM
      Dark showers
      Conveners: Annapaola De Cosa (ETH Zurich (CH)), Suchita Kulkarni (University of Graz), Sukanya Sinha (University of Manchester (GB))
      • 9:00 AM
        Introduction 5m
        Speakers: Annapaola De Cosa (ETH Zurich (CH)), Suchita Kulkarni (University of Graz), Sukanya Sinha (University of Manchester (GB))
      • 9:05 AM
        Strongly-interacting dark sectors and DM relic density: an overview 20m
        Speaker: Felix Kahlhoefer (Karlsruhe Institute of Technology)
      • 9:35 AM
        Experimental results: ATLAS 15m
        Speaker: Dilia Maria Portillo Quintero (TRIUMF (CA))
      • 9:55 AM
        Experimental results: CMS 15m
        Speaker: Long Wang (University of Maryland (US))
      • 10:15 AM
        Reinterpretation of CMS emerging jets for Higgs-mediated dark showers 12m

        In this talk we will present the reinterpretation of the CMS emerging jets (that is, long-lived dark pions belonging to a strongly interacting dark sector), published in JHEP 01 (2024) 034 (arXiv:207.04847) and will show that particularly this search can set meaningful bounds on scenarios where the SM Higgs boson mediates between the visible and dark sectors. In particular we find that for dark pion lifetimes between 5-100 mm the reintepretation of this search, while suboptimal, would be more sensitive than the extrapolation of the BSM Higgs search (2.5 - 4 %, depending on the assumed systematics).

        Hence, this talk combines:

        a) dark showers, and in particular emerging jets, which is a LLP signature subset (and how to reinterpretate them)
        b) s-channel mediators (the Higgs)
        c) Higgs to invisible (or actually to "undetected", as we do expect the dark pions to decay into the SM).

        Speaker: Dr José Francisco Zurita (IFIC - Univ. of Valencia and CSIC (ES))
      • 10:30 AM
        Exploration of b-philic SVJ and new discriminating observables 12m

        After the first round of SVJ experimental results, the focus has shifted to exploring more specific topologies, as well as attempts to design more sensitive observables. In this presentation, we will cover an exploratory study of SVJs produced preferentially with bottom quarks, including looking at the sensitivity from current public results. The advantage of using variable radius jets will be discussed. In the second part, we will cover our attempts to discriminate SVJs better, by designing observables less sensitive to specifics of Pythia8 HV modelling.

        Speaker: Deepak Kar (University of the Witwatersrand (ZA))
      • 10:45 AM
        Coffee 30m
      • 11:15 AM
        Dark sector glueballs 20m
        Speaker: Caleb Gemmell (University of Toronto)
      • 11:40 AM
        Probing new signatures for semi-visible jets at the LHC 12m

        The Hidden Valley scenario consists of a set of models where the Standard Model is accompanied by a Hidden Sector and connected with it via a heavy mediator or a weak coupling. If realised in nature, the Hidden Valley scenario may result in unusual and little-studied phenomena at the LHC. Under the assumption of a QCD-like confining dark sector, novel experimental signatures emerge, characterized by sprays of particles resembling hadronic jets containing stable invisible dark matter bound states. The resulting signature is characterised by missing momentum aligned with one of the jets, defining an orthogonal phase-space compared to traditional WIMPs searches. These semi-visible jets have been studied theoretically and experimentally in the fully hadronic signature where the unstable composite dark bound states can only decay promptly back to Standard Model quarks. We present a set of new simplified models allowing the decays of the unstable dark bound states to leptons, photons and b-quarks. The new resulting signatures are semi-visible jets characterised by an enhanced presence of non-isolated leptons or photons, coming directly from dark bound states decays or from subsequent decays of tau leptons or B mesons. We discuss possible constraints from previous searches from the CMS and ATLAS experiments, as well as propose possible realistic analysis strategies for Run2 and Run3 leveraging the enhanced leptonic or photon content of these anomalous jets.

        Speaker: Cesare Tiziano Cazzaniga (ETH Zurich (CH))
      • 11:55 AM
        Foundation Models as a new tool to uncover the dark sector? 15m
        Speaker: Joschka Birk (Hamburg University (DE))
      • 12:15 PM
        SIFTing for dark shower signals 12m

        I present ongoing work seeking to identify the presence of dark shower phenomena in otherwise ordinary-seeming jets using jet substructure techniques with a particular focus on the recently-proposed SIFT algorithm. The aim is to explicitly identify the mass scale signature of the dark shower products which then promptly decay back into SM quarks, giving effectively normal-looking SM jets. This is the most challenging case for detecting dark shower activity; if we can differentiate this from QCD the same tools should be useful to sharpen semi-visible or emerging jet searches as well.

        Speaker: William Shepherd
      • 12:30 PM
        Discussion and wrap up 30m
        Speakers: Annapaola De Cosa (ETH Zurich (CH)), Suchita Kulkarni (University of Graz), Sukanya Sinha (University of Manchester (GB))
    • 1:00 PM 1:10 PM
      Close out 10m
      Speaker: James Frost (University of Oxford (GB))