LLP2026: 16th workshop of the Long-Lived Particle Community

Contribution List

75. Welcome to Cambridge

Oleg Brandt (University of Cambridge (GB))

29/06/2026, 13:30

65. Latest searches for LLPs at LHCb

Felicia Volle (University of Birmingham (GB))

29/06/2026, 13:35

Talk 15'

The exploration of long-lived particles (LLPs) provides a powerful avenue to probe physics beyond the Standard Model, with particular sensitivity to feebly interacting states that escape conventional prompt searches. The LHCb experiment, with its forward acceptance, excellent vertexing and mass resolution, and flexible trigger strategy, is uniquely positioned to study displaced decays over a...

81. Dark Scalar Reinterpretation of Searches for Higgs Boson Decays into Long-Lived Particles at the LHC

Martin Alcalde Martinez (CIEMAT - Centro de Investigaciones Energéticas Medioambientales y Tec. (ES))

29/06/2026, 14:00

Session 1

82. A Hyperparameter Study of proANUBIS Detector Configurations

Cayetano Fernandez Ruiz (University of Cambridge (GB))

29/06/2026, 14:03

Session 1

83. CODEX-β: Hardware Installation and Commissioning

Alejandro Novo Cal (Universidade de Santiago de Compostela (ES))

29/06/2026, 14:06

Session 1

84. Projected Sensitivity of ANUBIS to ALP models

Francis Sayer, Riley Aumonier

29/06/2026, 14:09

Session 1

96. proANUBIS Calibrations, Performance, and Timing Synchronisation

Michael Revering (University of Cambridge (GB))

29/06/2026, 14:12

Session 1

77. CMS overview

Kai Hong Law (Imperial College (GB))

29/06/2026, 14:20

Talk 15'

CMS summary overview talk.

87. Heterogeneous Graph Neural Network for Particle Track Reconstruction in MATHUSLA

Bec Man

29/06/2026, 14:45

Session 1

88. Sub-GeV Long-Lived Particle Searches at $e^+e^-$ Colliders

Althaf Mohammed Rafi

29/06/2026, 14:48

Session 1

89. Recent Sensitivity Results from ANUBIS

Camilia Ben Messaouda

29/06/2026, 14:51

Session 1

90. A SHIFT of Perspective: Observing Neutrinos at CMS and ATLAS

Jeremi Niedziela (Vrije Universiteit Brussel (BE))

29/06/2026, 14:54

Session 1

92. Early Results from the FORMOSA Millicharged Particle Demonstrator

Ryan Schmitz (Imperial College (GB))

29/06/2026, 14:57

Session 1

78. Recent Results of Long-Lived Particle Searches at ATLAS

Paul Nathaniel Swallow (University of Cambridge (GB))

29/06/2026, 15:05

Talk 15'

ATLAS summary overview talk.

93. ACTS-Based ITk Reconstruction of Large Impact Parameter Tracks in ATLAS

Makayla Vessella 🐏 (University of California Irvine (US))

29/06/2026, 15:30

Session 1

94. Kinked-Track Signatures of Long-Lived particles at FCC-ee

Soumyaa Vashishtha (Deutsches Elektronen-Synchrotron (DE))

29/06/2026, 15:33

Session 1

95. Enhancing Sensitivity to Long-Lived Particles at HL-LHC with Innovative Trigger Technique

Elena Aller Gutierrez (Universidad de Oviedo (ES))

29/06/2026, 15:36

Session 1

85. Search for Long-Lived Particles Coupled to Top Quarks with the ATLAS Detector

Clara Carrion Martinez (Instituo de Física Corpuscular (IFIC) - CSIC/UV)

29/06/2026, 15:39

Session 1

97. Optimization of the IDEA Muon System as a Standalone Tracker for Displaced Signatures at FCC-ee

Mahmoud AlThakeel (Universita Di Bologna (IT))

29/06/2026, 15:42

Session 1

98. CODEX-β: Software Developments for LLP Searches

Alberto Martinez Armas (Universidade de Santiago de Compostela (ES))

29/06/2026, 15:45

Session 1

26. Updated Results from the milliQan Experiment

Juan Salvador Tafoya Vargas (University of California Davis (US))

29/06/2026, 16:20

Talk 15'

We will give an update from the milliQan experiment at CERN. The milliQan "bar" detector was completed in 2023 and has been taking physics data since then. The milliQan "slab" detector was completed in 2024 and has been taking physics data since 2025. We will give an update on the readiness of the slab detector for physics data taking. We will present updated results on the search for...

50. Search for long-lived particles using displaced vertices of oppositely charged leptons in 140 fb^{-1} of pp collisions at \sqrt{s} = 13 TeV with the ATLAS detector

Neil Andrew Pohl (Ohio State University (US))

29/06/2026, 16:40

1

Talk 12'

A search is presented for long-lived particles decaying into an oppositely charged lepton pair, $\mu^{+}\mu^{-}$, $e^{+}e^{-}$, or $e^{\pm}\mu^{\mp}$, that form a vertex within the inner tracking system of the ATLAS detector at the Large Hadron Collider, displaced from the primary proton-proton interaction region. The analysis uses the $140 fb^{-1}$ of Run-2 data collected at $\sqrt{s}=13$ TeV...

56. Search for Axion-Like Particles in a Beam-Dump Experiment at KEK LINAC (EBES)

Fumihito IKEDA (School of Science, The University of Tokyo (Ootani-LAB))

29/06/2026, 16:55

Talk 15'

Axion-like particles (ALPs) in the MeV–GeV range are well motivated by cosmology. They can arise as dark matter via thermal or non-thermal production, while inflationary dynamics shape their initial abundance. This parameter space satisfies cosmological constraints and remains accessible to accelerator experiments, enabling direct probes of early-Universe physics.
EBES (Electron Beam-dump...

35. Strategy and performance of the CMS long-lived particle trigger program in Run 3

Juliette Alimena (DESY)

29/06/2026, 17:15

Talk 12'

In the physics program of the CMS experiment during the CERN LHC Run 3, which started in 2022, the long-lived particle triggers have been improved and extended to expand the scope of the corresponding searches. These dedicated triggers and their performance are described in this talk, using several theoretical benchmark models that extend the standard model of particle physics. The results are...

47. Precision measurements and searches with metre-scale displaced vertices at LHCb

Izaac Sanderswood (Univ. of Valencia and CSIC (ES))

29/06/2026, 17:30

Talk 15'

The recent upgrade of the LHCb trigger and reconstruction system enables, for the first time, the efficient reconstruction of decay vertices using only tracks in the downstream tracking stations (T tracks), extending the fiducial decay volume up to about 8 m from the interaction point. This opens a unique window on the study of metre-scale displaced decays. The talk highlights how highly...

102. Session Intro

Dr José Francisco Zurita (IFIC, CSIC‐UV)

30/06/2026, 09:00

Talk 15'

Hands-on Session

103. Hackathon Session

Federico Leo Redi (U. of Bergamo and INFN Milan (IT)), Jack Gargan (University of Cambridge (GB)), Tomasz Procter (Jagiellonian University (PL))

30/06/2026, 09:20

Hands-on Session

29. The Forward Physics Facility

John Kenneth Anders (University of Liverpool (GB))

30/06/2026, 14:00

Talk 15'

The Forward Physics Facility (FPF) is a proposal developed to exploit the unique scientific potential made possible by the intense hadron beams produced in the far-forward direction at the high luminosity LHC (HL-LHC). The physics case for the FPF has continued to grow, and plans have matured on defining the facility and its experiments to realize this physics potential in a timely and...

49. Search for Soft Unclustered Energy Patterns containing muons in the final state in pp collisions at 13 TeV with the ATLAS detector

Dr Ligang Xia (Nanjing University (CN))

30/06/2026, 14:20

Talk 12'

Soft unclustered energy patterns (SUEPs) are characterized by high-multiplicity, isotropic distributions of low-momentum particles. The search for SUEPs containing muons in the final state is presented using 140 fb^−1 of proton–proton collision data collected by the ATLAS detector at the Large Hadron Collider during 2015–2018. The analysis targets SUEP signatures produced via gluon–gluon...

70. Long-lived particle searches at FASER and future machines

Wei Su (Sun Yat-sen University)

30/06/2026, 14:35

Talk 15'

In this work we study the prospect of detecting light scalars at the FASER, Mathusla codex-B etc. We develop the general formalism for the scalar production and decay from mesons with PP collision, given modified couplings of the scalars to the SM particles, as well as summarizing the relevant GeV-scale experiment constraints. We then analyze the reaches of light scalars in the large tan𝛽...

51. Ultra-displaced dimuon vertexing for long-lived particle signatures in ATLAS

Andrew Toler 🦝 (University of Massachusetts Amherst (US))

30/06/2026, 14:55

Talk 12'

This talk presents a new secondary-vertexing technique based exclusively on StandAlone muon tracks reconstructed in the ATLAS Muon Spectrometer. These tracks, formed from Muon Spectrometer measurements without an associated Inner Detector track, naturally arise from highly displaced muon decays and are extremely rare for Standard Model processes. By exploiting the full detector-wide track...

54. Lepton Number Violation at Hadron Colliders

Mr Bruno M. S. Oliveira (Centro de Física Teórica de Partículas (CFTP), Instituto Superior Técnico (IST), Universidade de Lisboa (UL))

30/06/2026, 15:10

Talk 15'

Symmetry-protected low-scale type-I seesaw models can explain the observed pattern of neutrino masses while predicting collider-accessible heavy neutral leptons (HNLs) that appear as pseudo-Dirac pairs. In such scenarios, lepton-number (LN) violation is strongly suppressed at the amplitude level by the approximate LN-like symmetry. However, a realistic treatment of HNL production, propagation,...

59. The BSM Physics Programme in ALICE: Probing Long-Lived Particles with the TPC

Tuba Gundem (Goethe University Frankfurt (DE))

30/06/2026, 16:00

Talk 15'

In this talk, a hybrid detector strategy targeting Beyond the Standard Model (BSM) highly ionizing particles (HIPs) and long-lived particles (LLPs) within the ALICE experiment is presented. The approach combines an FPGA-based hardware trigger in the Time Projection Chamber (TPC) during online processing with an offline trigger based on the Inner Tracking System (ITS), together with dedicated...

61. Revising mass bounds for highly ionising particles after resummation

Dr Vasiliki Mitsou (IFIC, CSIC-UV)

30/06/2026, 16:20

Talk 15'

Magnetic Monopoles (MM) and high-electric-charge objects (HECOs) are highly ionising particles actively searched for at the LHC. Unfortunately, due to their large couplings, tree-level cross sections, and the resulting mass limits, are in principle unreliable.
We present analytical results from loop resummation techniques à la Dyson and Schwinger in strongly coupled gauge theories in the...

5. The SHiP/NA67 experiment at the ECN3 high-intensity beam facility at the CERN SPS

Dr Anne-Marie Magnan (Imperial College (GB))

30/06/2026, 16:40

Talk 15'

The SHiP/NA67 experiment is a general-purpose intensity-frontier experiment for the search for feebly interacting GeV-scale particles and to perform neutrino physics measurements at the HI-ECN3 (high-intensity) beam facility at the CERN SPS, operated in beam-dump mode, taking full advantage of the available $4\times 10^{19}$ protons per year at 400 GeV. The collaboration is currently...

63. Proposing GRENDEL: a new dedicated LLP detector at the LHC

Federico Leo Redi (U. of Bergamo and INFN Milan (IT)), Matthew Daniel Citron (University of California Davis (US))

30/06/2026, 17:00

Talk 15'

We propose GRENDEL (GalleRy ExperimeNt for Decays of Exotic LLPs), a dedicated LLP detector to be installed in the existing PX56 drainage gallery at CMS Point 5. The gallery sits approximately 22 m above the CMS interaction point, with CMS detector material and 15--20 m of rock and concrete providing shielding from hadronic backgrounds and roughly 70 m of overburden suppressing the cosmic-ray...

14. CODEX-β: From Installation to Data Taking, Hardware and Software Integration

Alberto Martinez Armas (Universidade de Santiago de Compostela (ES))

30/06/2026, 17:20

Talk 15'

CODEX-b (COmpact DEtector for EXotics at LHCb) is a proposed transverse detector designed to search for Beyond the Standard Model (BSM) physics, targeting Long-Lived Particles (LLPs) with displaced decays. It would consist of a 10 × 10 × 10 m³ array of Resistive Plate Chamber (RPC) triplet units located in the LHCb cavern, enabling access to parameter space beyond the reach of existing...

8. Axion-like Particle Searches with the FASER Detector at the LHC: Reach and Prospects

Charlotte Cavanagh (ETH Zurich (CH))

30/06/2026, 17:40

Talk 12'

The FASER detector at the LHC is a small, far-forward detector 480 m from the ATLAS IP1 that is capable of probing numerous BSM physics models. This talk presents the re-interpretation of FASER's 2024 search for axion-like particles (ALPs) with the addition of the 2024 Run 3 dataset. This search probes models including ALPs with coupling to the $SU(2)_L$ gauge boson, the PBC benchmark ALPs...

43. New physics searches in beam dump at the NA62 experiment

Stefan Alexandru Ghinescu

01/07/2026, 09:00

Talk 15'

The NA62 experiment at CERN, designed to measure the highly-suppressed decay $K^{+} \to \pi^{+}\nu\bar{\nu}$, has the capability to collect data in a beam-dump mode, where 400 GeV protons are dumped on an absorber. In this configuration, New Physics particles may be produced in the absorber and decay in an instrumented volume beginning approximately 80 m downstream of the dump. Preliminary...

22. Search for stau pair production with the DisTau identification algorithm

Andrea Cardini (ICTEA - Universidad de Oviedo (ES))

01/07/2026, 09:20

Talk 12'

This talk presents a recent result from the CMS Collaboration: the search for long-lived supersymmetric partners of the tau leptons decaying within the tracker volume of the CMS experiment. The search was performed by analyzing an integrated luminosity of 138 fb-1 collected by the CMS experiment between 2016 and 2018 using a dedicated identification algorithm targeting tau lepton decays...

20. New Strategies for Long-Lived Heavy Neutral Leptons in the $\ell+\rho$ Channel

Marzieh Bahmani (Humboldt University of Berlin (DE))

01/07/2026, 09:35

Talk 15'

Heavy Neutral Leptons (HNLs) in the GeV mass range can give rise to long-lived signatures and observable effects across a range of experiments, such as ATLAS and SHiP. Their phenomenology depends on both production and decay dynamics, motivating the development of robust and broadly applicable analysis strategies.

In this talk, I present recent progress in developing such strategies for...

64. Recent searches for new LLPs using the MicroBooNE detector

Magnus Handley (University of Cambridge)

01/07/2026, 09:55

Talk 15'

The intense meson fluxes produced in conventional neutrino beamlines provide a rich test bed for probing long-lived particles beyond the Standard Model. MicroBooNE, a liquid argon time projection chamber at Fermilab, is uniquely positioned for such searches, operating both off-axis to the Main Injector Neutrino (NuMI) beamline and on-axis to the Booster Neutrino Beam (BNB).

In this talk, I...

53. Long-Lived Particle Signatures in Nucleon Decay

Patrick Adolf

01/07/2026, 10:15

Talk 15'

We present a new class of nucelon decay signatures including a long-lived particle (LLP) as a decay product. Therefore, the detector signature consists of two spatially separated but temporally correlated vertices, the initial nucleon decay and the decay of the LLP. The signature has the advantage to be nearly background-free in experiments such as Super-Kamiokande, Hyper-Kamiokande and JUNO,...

55. Search for emerging jets in $pp$ collisions at $\sqrt{s} = 13~\mathrm{TeV}$ with the ATLAS experiment

Ian Alejandro Ramirez-Berend (Carleton University (CA))

01/07/2026, 10:35

Talk 12'

A search is presented for emerging jets using $140~\mathrm{fb}^{-1}$ of proton--proton collision data at $\sqrt{s} = 13~\mathrm{TeV}$, collected by the ATLAS experiment between 2015 and 2018. The search looks for the existence of a dark sector with symmetries similar to those in quantum chromodynamics. This dark sector is populated with dark quarks, which undergo showering similar to quarks in...

10. Search for Quirks with the FASER Experiment at the LHC

Arash Jofrehei (Universite de Geneve (CH))

01/07/2026, 11:20

Talk 12'

Quirks are particles that have Standard Model (SM) interactions and also interact through infracolor (IC), a new strong force. In models where the IC confinement scale is much less than the quirk mass, $\Lambda \ll m_\mathrm{Q}$, quirk pairs produced at colliders are connected by an IC string force and oscillate around their center of mass with unusual trajectories that escape traditional...

21. Search for dark photon bremsstrahlung by muons in proton-proton collisions using the CMS detector

Michael Revering (University of Cambridge (GB))

01/07/2026, 11:35

Talk 12'

A recent analysis for dark photon bremsstrahlung using data collected by the CMS detector at the LHC is presented. The search uses the tag-and-probe method with muon-antimuon pairs produced in the decay of Z-bosons to search for secondary interactions in the calorimeters, using one fully reconstructed muon to trigger and tag the event and using the inner detector track of the other muon to...

17. Searching for apparent baryon number violation in $\Lambda_c^+$ decays at the Super Tau-Charm Facility

Zeren Simon Wang (Hefei University of Technology)

01/07/2026, 11:50

Talk 15'

Observation of baryon number violation (BNV) in laboratory experiments would constitute unambiguous evidence for physics beyond the Standard Model. We propose dedicated searches for \textit{apparent} BNV in charm-baryon decays, $\Lambda_c^+\to M^+ +$~missing energy ($M=\pi, K$) where the missing energy stems from a resonance. These channels have not been explored experimentally so far, despite...

42. Dedicated LLP Detector Concepts for Future Colliders: DELIGHT-SHIELD, DELIGHT and FOREHUNT

Rhitaja Sengupta (BCTP and Physikalisches Institut der Universität Bonn, Germany)

01/07/2026, 12:10

Talk 15'

Searches for new physics increasingly focus on light, weakly interacting long-lived particles (LLPs), where highly displaced signatures challenge general-purpose detectors. Dedicated LLP experiments are therefore essential, but their impact depends critically on optimised geometry and placement. The Future Circular Collider (FCC) offers a unique opportunity to design such detectors from the...

57. PREFACE: A new very forward long-lived particle search at the LHC

Dr Aldo Penzo (Univ. Iowa)

01/07/2026, 14:19

Talk 12'

PREFACE is being proposed as a new CMS subsystem in the very forward direction at z = 100-120m, with silicon tracking and HGCAL modules mounted above the beam pipe. It has unique sensitivity in regions of the mass:coupling plane to any BSM weakly interacting particles that can pass through > 30 m of iron and decay to SM particles in a 10 m^3 fiducial volume. Possibilities include dark scalars,...

46. Run-3 Emerging Jets search at ATLAS

Harshit Choudhary (Simon Fraser University (CA))

01/07/2026, 14:20

Talk 12'

Dark matter remains one of the central open questions in particle physics, motivating searches for hidden sectors with new particles and interactions. In dark QCD-like models, dark quarks can hadronize into long-lived dark hadrons that decay within the detector, giving rise to jets with displaced tracks and vertices. These signatures, known as emerging jets, provide a distinctive probe of...

32. Search for Inelastic Dark Matter with Soft Displaced Electrons at the CMS Experiment

Kyungmin Park (Carnegie-Mellon University (US))

01/07/2026, 14:35

Talk 12'

This talk presents a new search for inelastic dark matter (IDM) in the dielectron final state with the CMS detector. IDM posits a dark photon portal to dark sector states with a small mass imbalance, with one acquiring a macroscopic lifetime resulting in a distinct LHC final state with soft, displaced leptons and large missing transverse momentum. We use a special electron reconstruction...

40. ANUBIS: latest results and Physics Case

Aashaq Shah (University of Cambridge (GB))

01/07/2026, 14:50

Talk 15'

The Standard Model (SM), despite its successes, is known to have several major limitations, such as the inability to describe Dark Matter, which has been astronomically observed. These limitations have led to the development of a variety of Beyond the Standard Model (BSM) theories to resolve them, which can often give rise to Long-Lived Particles (LLPs). LLPs provide a valuable probe of BSM...

36. The MoEDAL-MAPP Programme at LHC’s IP8 – Current Status and Future Plans

James Pinfold (University of Alberta (CA))

01/07/2026, 15:10

Talk 15'

The MoEDAL-MAPP programme at LHC Interaction Point 8 provides a distinctive approach to search for long-lived and feebly interacting particles, using both the MoEDAL highly ionizing particle (HIP) detector and the MAPP apparatus in the UA83 tunnel. In Run 3, MoEDAL has continued searches for magnetic monopoles, highly electrically charged objects, and other slowly moving highly ionizing...

100. Drinks Reception

01/07/2026, 19:00

Dinner

101. Dinner

01/07/2026, 19:30

Dinner

67. Long-Lived Particles from Strongly Interacting Dark Sectors

Graham Kribs

02/07/2026, 09:30

Talk 35'

Strongly-interacting dark sectors often contain a wide variety of long-lived particles. In this talk I'll provide an overview of the physics, what strong-coupling "buys" you in terms of the effective theory of the low energy degrees of freedom, and then survey the theory landscape. Among the most promising targets for current and future experiments are dark glueballs and dark mesons that...

38. Search for massive, long-lived particles with displaced vertices and displaced muons using ATLAS 2022-2024 Data

Laura Elaine Bruce (Harvard University (US))

02/07/2026, 10:10

Talk 12'

A new search for massive long-lived particles (LLPs) is presented using 164 fb⁻¹ of proton-proton data at √s = 13.6 TeV collected by the ATLAS detector during 2022–2024, targeting events with displaced vertices and displaced muons (arXiv:2603.01991). It leverages improved Large Radius Tracking and displaced muon triggering capabilities introduced for Run 3. Background contributions are...

9. MATHUSLA: Progress and Updates

Caleb Miller

02/07/2026, 10:25

Talk 15'

MATHUSLA (MAssive Timing Hodoscope for Ultra-Stable neutraL pArticles) is a proposed long live particle detector to be installed on the surface above the CMS collision point at the LHC. The large area footprint of 40 m x 40 m x 25 m, as described in the Conceptual Design Report published in 2025[1], combined with the distance of $\sim$100 m from the collision point gives MATHUSLA an order of...

13. Testing frozen-in dark matter with a long-lived dark Higgs

Giovanna Cottin (Pontificia Universidad Católica de Chile (CL))

02/07/2026, 11:15

Talk 15'

I will motivate the quest for new, long-lived physics at colliders able to explain dark matter. The impact of the cosmic reheating dynamics on dark matter freeze-in production will be discussed in a specific Higgs-portal model that predicts a long-lived dark Higgs boson. I will emphasise the crucial role of collider LLP searches, focusing on prospects at the Future Circular Collider (FCC-hh)...

34. Search for long-lived heavy neutral leptons in proton-proton collisions with one prompt muon and a secondary vertex from two displaced muons

Anna Mascellani (ETH Zurich (CH))

02/07/2026, 11:35

Talk 12'

This talk presents a search for heavy neutral leptons (HNLs) in final states with three muons, with one originating from the prompt primary interaction vertex and the other two originating from a common displaced vertex. The analysis strategy is optimised for large HNL decay lengths by considering very displaced muons reconstructed only outside the tracker of the CMS experiment at the CERN...

16. Quantum Number Theory and New Predictions of Millicharge Doublet

Yu-Dai Tsai (The University of Manchester)

02/07/2026, 11:50

Talk 15'

In quantum gauge theories, anomaly cancellation severely restricts the allowed patterns of chiral charges. Here we show that, in a phenomenologically motivated framework for light minicharged particles, the anomaly cancellation conditions are equivalent to the degree k=3 Prouhet-Tarry-Escott problem in number theory. This correspondence immediately implies that the hidden sector must contain...

15. DarkMatterLive: A Community Framework for unified dark sector costraints including the ones with LLPs.

Dr Brij Kishor Jashal (Rutherford Appleton Laboratory)

02/07/2026, 12:10

Talk 15'

In many BSM scenarios, dark matter candidates manifest as long-lived particles (LLPs), arising from suppressed couplings or small mass splittings. These scenarios are probed through LLP searches at colliders and fixed-target experiments, complemented by dark matter constraints from direct, indirect, and cosmological observations. However, results across these programmes are reported in...

99. Looking forward to LLP 2027!

02/07/2026, 12:30

Talk 15'

104. Hackathon Materials 2

02/07/2026, 13:30

Hands-on Session

https://cernbox.cern.ch/s/o59iI2hbYua4VOc

28. Long-lived HNLs via ALP portal at the LHC

MARTIN KONRAD HIRSCH Not Supplied (Instituto de Física Corpuscular, Universidad de Valencia - CSIC)

03/07/2026, 09:00

Talk 15'

Heavy neutral leptons (HNLs) and axion-like particles (ALPs) are both considered well-motivated candidates for beyond the standard model (BSM) physics. If ALPs with sizable couplings to gluons (and HNLs) exist, they will be abundantly produced at the LHC, possibly providing high sensitivities to HNL parameters. We study the prospects for the high-luminosity LHC to search for long-lived HNLs in...

33. Search for displaced muons in proton-proton collisions using the CMS Experiment

Celia Fernandez Madrazo (Boston University (US))

03/07/2026, 09:20

Talk 12'

This talk presents recent results from searches for displaced dimuon resonances with the CMS detector, targeting a broad range of new physics scenarios involving long-lived particles. The most recent results, obtained with scouting streams, are compared with other existing CMS searches, highlighting their complementarity at lower masses. Signatures with one or multiple dimuon resonances over a...

6. Prospects for the search of quirks at LHCb

Alejandro Novo Cal (Universidade de Santiago de Compostela (ES))

03/07/2026, 09:35

Talk 15'

Quirks are heavy particles connected by a flux tube from a hidden confining force that remain weakly constrained in large regions of their parameter space. This flux tube acts as a string that, at short enough distance, stretches as the quirk pair separates, then pulls the pair back together leading to interesting dynamics. We propose a novel search using the LHCb Vertex Locator (VELO), whose...

7. LLP opportunities at FCC-ee

Mahmoud AlThakeel (Universita Di Bologna (IT))

03/07/2026, 09:55

Talk 15'

The electron-positron stage of the Future Circular Collider (FCC-ee) is a precision frontier factory for Higgs, electroweak, flavour, top quark, and QCD physics. It is designed to operate in a 91-km circular tunnel built at CERN, and will serve as the first step towards $O(100$ TeV) proton-proton collisions. In addition to an essential Higgs program, the FCC-ee offers unique and powerful...

37. Searches for long-lived particles decaying in the CMS muon detector system

Karim El Morabit (Hamburg University (DE))

03/07/2026, 10:15

Talk 12'

Many extensions of the Standard Model predict new long-lived particles (LLPS) with a wide range of possible proper lifetimes, masses and decay modes.

This talk presents recent results for searches for long-lived particles decaying inside the CMS muon detector system. The focus will be on the most recent results obtained with proton-proton collisions recorded during LHC Run 3, corresponding...

19. Same-sign dimuon probe of charged lepton flavor violation at electron–photon colliders

Dr Yu Zhang (Hefei University of Technology)

03/07/2026, 11:00

Talk 15'

Observation of charged lepton flavor violation would constitute unambiguous evidence for physics beyond the Standard Model (SM). We identify a previously unexplored same-sign dimuon signature in electron--photon collisions, $\gamma e^- \to e^+\mu^-\mu^-$, mediated by an axionlike particle (ALP) with flavor-violating $e$--$\mu$ couplings. The absence of irreducible SM backgrounds and the...

23. Search for long-lived charged particles using level-1 scouting data from proton-proton collisions at the CMS experiment

Elton Shumka (Purdue University Northwest (US))

03/07/2026, 11:20

Talk 12'

The recent search at the CMS experiment for Long-Lived Charged Particles in the low beta region is presented. The search utilizes the capabilities introduced by the deployment of the CMS Level-1 Data Scouting System in Run 3, which allows for the collection of muon barrel system information from consecutive bunch crossings, without the application of any triggers. This novel approach exhibits...

60. Model-independent searches for long-lived particles at LHCb with BuSca

Jiahui Zhuo (Univ. of Valencia and CSIC (ES))

03/07/2026, 11:35

Talk 15'

BuSca (Buffer Scanner) is a real-time data monitoring and analysis framework designed to guide searches for new physics at the LHCb experiment at CERN, operating prior to any trigger decision. By accessing the full proton–proton collision rate of 30 MHz, it enables the exploration of previously inaccessible regions of phase space. Long-lived particle tracks are reconstructed and analysed in...

105. Closeout + prize winners!

03/07/2026, 12:00

31. [Cancelled] Search for magnetic monopoles in proton-proton collisions using the CMS Experiment

Thales Menezes De Oliveira (CBPF - Brazilian Center for Physics Research (BR))

[Cancelled due to Analysis not completing in time]

A search for Dirac magnetic monopoles as exotic, long-lived particles is conducted using proton-proton collision data collected with the CMS detector at the CERN LHC, corresponding to an integrated luminosity of 137.2 fb⁻¹ from 2016 to 2018. The analysis focuses on the distinctive signature of a highly ionizing particle that deposits...

41. A hyperparameter study of proANUBIS detector configurations

Poster

Reception and Poster Session

The ANUBIS experiment is a proposed transverse LLP experiment that would be located on the ceiling of the ATLAS cavern, in the LHC. Its sensitivity to an uncharted region of LLP phase-space, favouring high lifetimes and heavy mediators, compliments the sensitivity of general-purpose detectors as well as longitudinal ones. ProANUBIS, the prototype version of ANUBIS, has been taking data in the...

66. A SHIFT of Perspective: Observing Neutrinos at CMS and ATLAS

Jeremi Niedziela (Vrije Universiteit Brussel (BE))

Poster

Reception and Poster Session

We investigate the physics potential of SHIFT@LHC, a proposed gaseous fixed target installed in the LHC tunnel, as a novel source of detectable neutrinos. Using simulations of proton-gas collisions, hadron propagation, and neutrino interactions, we estimate that O(10^4) muon-neutrino and O(10^3) electron-neutrino interactions, spanning energies from 20 GeV to 1 TeV, would occur in the CMS and...

80. ACTS-Based ITk Reconstruction of Large Impact Parameter Tracks in ATLAS

Poster

Reception and Poster Session

The ATLAS experiment is implementing a comprehensive software upgrade for Phase-II of the LHC,
centred on a new all-silicon Inner Tracker (ITk). A key component of this effort is the migration
of track reconstruction to ACTS, an experiment-independent, thread-safe, high-performance tracking
toolkit. While the primary track reconstruction pass ($|d_0| < 2$~mm) has already been...

1. Arrival and Registration

73. CODEX-β: Hardware Installation and Commissioning

Alejandro Novo Cal (Universidade de Santiago de Compostela (ES))

Poster

Reception and Poster Session

The COmpact DEtector for EXotics at LHCb (CODEX-b) is a proposed detector dedicated to searches for displaced decays of long-lived particles (LLPs) motivated by dark-sector scenarios beyond the Standard Model. The detector is designed as a 10 × 10 × 10 m³ cube of Resistive Plate Chamber (RPC) triplet units with two internal sections, to be installed near the LHCb interaction point. Its design...

72. CODEX-β: Software Developments for LLP Searches

Alberto Martinez Armas (Universidade de Santiago de Compostela (ES))

Poster

Reception and Poster Session

CODEX-b (COmpact DEtector for EXotics at LHCb) is a proposed transverse detector dedicated to searches for Beyond the Standard Model (BSM) physics through signatures involving Long-Lived Particles (LLPs) with displaced decays. Located in the LHCb cavern, the detector would consist of a 10 × 10 × 10 m³ array of Resistive Plate Chamber (RPC) triplet units, providing sensitivity to regions of...

25. Dark scalar reinterpretation of searches for Higgs boson decays into long-lived particles at the LHC

Martin Alcalde Martinez (CIEMAT - Centro de Investigaciones Energéticas Medioambientales y Tec. (ES))

Poster

Reception and Poster Session

We present a reinterpretation of selected ATLAS and CMS searches for Higgs boson decays into long-lived particles (LLPs) within the scalar portal framework, where the Standard Model is extended by a light scalar that mixes with the Higgs boson. Using public HEPData results, we evaluate the sensitivity of several experimental strategies targeting different final states. The study also...

86. DarkMatterLive: A Community Framework for Unified Dark Sector Costraints Including Those with LLPs

Brij Kishor Jashal (Rutherford Appleton Laboratory)

Session 1

3. Departure

74. Early results from the FORMOSA millicharged particle demonstrator

Poster

Reception and Poster Session

The FORMOSA detector at the proposed Forward Physics Facility is a scintillator-based experiment designed to search for signatures of "millicharged particles" produced in the forward region of the LHC. A pathfinder experiment, the FORMOSA demonstrator, was installed in the FASER cavern at the LHC in early 2024 and has been collecting collisional data. New results, including leading...

30. Enhancing Sensitivity to Long-Lived Particles at HL-LHC with Innovative Trigger Technique

Poster

Reception and Poster Session

The High-Luminosity phase of the LHC will introduce unprecedented data rates and pileup conditions, demanding innovative trigger technologies to identify signatures that could uncover new physics with the CMS detector. This talk presents the work done to identify long-lived particle (LLP) decays within the Phase-2 CMS L1 Muon Trigger system. LLPs can produce displaced and unconventional...

18. Heterogeneous Graph Neural Network for Particle Track Reconstruction in MATHUSLA

Poster

Reception and Poster Session

Particle track reconstruction is one of the most computationally expensive process, which can create a bottleneck in the data processing pipeline. Graph neural networks have been presented as a viable machine learning approach to speed up the track reconstruction process. MATHUSLA is a proposed particle detector to be built at CERN above CMS in order to detect long lived particles produced in...

12. Kinked-Track Signatures of Long-Lived particles at FCC-ee

Poster

Reception and Poster Session

We present an analysis of charged long-lived particle pair production at FCC-ee at $\sqrt{s} = 240~GeV$, focusing on the tracking capabilities of the IDEA detector. In particular, we study long-lived staus, the supersymmetric partners of the tau lepton, decaying within the detector into a tau lepton and a gravitino. These decays give rise to distinctive signatures such as kinked tracks and...

4. Long-lived charged scalars: Catalyzed nuclear fusion and collider implications

Dr Sudip Jana (Harish-Chandra Research Institute)

Talk 15'

We show that the doubly charged scalar from the Left-Right Symmetric Model has its mass governed by a hidden symmetry, so that its value can be much lower than the SU(2)R breaking scale. This makes it a long-lived particle while being consistent with all existing theoretical and experimental constraints. Such long-lived doubly charged scalars have the potential to trigger catalyzed fusion...

71. Optimization of the IDEA Muon System as a Standalone Tracker for Displaced Signatures at FCC-ee

Poster

Reception and Poster Session

Long-lived particles (LLPs) decaying outside the inner tracker volume leave little or no information in the silicon and drift chamber subsystems, making the muon system the only detector capable of reconstructing such tracks at FCC-ee. We present a comprehensive study of the IDEA muon system, designed as a standalone tracker, with a focus on its capabilities for highly displaced...

45. proANUBIS calibrations, performance, and timing synchronization

Poster

Reception and Poster Session

The ANUBIS experiment proposal aims to extend experimental sensitivity to very long-lived particles in the HL-LHC via instrumenting the ceiling of the ATLAS cavern with RPC detectors. The proANUBIS detector, consisting of one prototype module of the planned design for ANUBIS, was installed on the scaffolding near ATLAS and collected cosmic and collision data from 2024 to 2025 in order to...

48. Projected Sensitivity of ANUBIS to ALP models.

Poster

Reception and Poster Session

ANUBIS is a proposed transverse detector to be located on the roof of the ATLAS cavern, providing sensitivity to LLPs with macroscopic lifetimes. Axion-like particles (ALPs) are pseudo-scalar particles with a more generic parameter space than the QCD axion, and are of interest as a Physics Beyond Colliders benchmark case. The fermion-coupled ALP benchmark has been analysed with investigations...

44. Recent Sensitivity Results from ANUBIS

Poster

Reception and Poster Session

Long-Lived Particles (LLPs) have strong potential to explain some of the missing components of the Standard Model (SM), such as the nature of Dark Matter (DM) and the origin of the neutrino masses via the seesaw mechanism. The ANUBIS experiment is a dedicated transverse detector, located above the ATLAS Interaction Point (IP) at the LHC, designed to probe particles with proper lifetimes τ >...

39. Search for long-lived particles coupled to top quarks with the ATLAS detector

Poster

Reception and Poster Session

More than a decade after the Large Hadron Collider (LHC) at CERN started taking data, no clear hint of New Physics has been observed. The preferential coupling of Axion-Like Particles (ALP) to third generation quarks, particularly top quarks, in scenarios where the ALP’s lifetime enhances its decay within the ATLAS detector, leading to displaced jets, has not been explored in detail. In this...

69. Searches for dark sector particles at Belle and Belle II

[Cancelled due to lack of Speaker]

The Belle and Belle II experiment have collected samples of $e^+e^-$ collision data at center-of-mass energies near the $\Upsilon(nS)$ resonances. These data have constrained kinematics and low multiplicity, which allow searches for dark sector particles in the mass range from a few MeV to 10 GeV. We present new searches in a $600~\mathrm{fb}^{-1}$...

68. Secondary Showers as a New Source of Millicharged Particles at the LHC

Jyotismita Adhikary (NCBJ, Warsaw)

Poster

Reception and Poster Session

Standard sensitivity estimates for far-forward mCP searches at the LHC focus exclusively on production at the interaction point. We show that the forward LHC particle absorber acts as a significant secondary source: energetic forward neutrons and photons initiate hadronic and electromagnetic showers that generate an additional mCP flux. Using Monte Carlo simulations interfaced with Geant4, we...

91. Secondary Showers as a New Source of Millicharged Particles at the LHC

Jyotismita Adhikary (NCBJ, Warsaw)

Session 1

27. sub-GeV Long-Lived Particle Searches at $e^+e^−$ Colliders

Poster

Reception and Poster Session

In popular beyond the standard models (BSMs) with sub-GeV vector bosons, the exotic vector boson can be long-lived for certain regions of the mass-coupling parameter space. At $e^+e^−$ colliders, these particles can be searched through displaced decays, where the particles travel a finite distance before decaying. In such searches, two main challenges are reconstructing these events in the...