Searching for long-lived particles at the LHC: Fifth workshop of the LHC LLP Community

27 May 2019, 09:00 → 29 May 2019, 17:30 Europe/Zurich

503/1-001 - Council Chamber (CERN)

Albert De Roeck (CERN), Brian Shuve (SLAC National Accelerator Laboratory), Carlos Vazquez Sierra (Nikhef National institute for subatomic physics (NL)), Giovanna Cottin (National Taiwan University), James Beacham (Duke University (US)), José Francisco Zurita (KIT), Juliette Alimena (Ohio State University (US)), Martino Borsato (Universidade de Santiago de Compostela (ES)), Michelangelo Mangano (CERN), Nishita Desai (TIFR, Mumbai), Ryu Sawada (University of Tokyo (JP)), Xabier Cid Vidal (Universidade de Santiago de Compostela)

Following the successes of the LHC Long-Lived Particle (LLP) Workshops in April and October of 2017 and May and October of 2018 -- and continuing the robust and rich tradition defined by prior workshops such as “LHC Searches for Long-Lived BSM Particles: Theory Meets Experiment", at U. Mass, Amherst, in November of 2015; “Experimental Challenges for the LHC Run II", at the Kavli Institute for Theoretical Physics in May of 2016; and the “LHC Long-Lived Particles Mini-Workshop" at CERN in May of 2016 -- the LHC LLP Community, composed of members of the CMS, LHCb, and ATLAS collaborations as well as theorists, phenomenologists and those interested in LLP searches with dedicated LHC detectors such as milliQan, MoEDAL, MATHUSLA, FASER, Codex-b, etc., convenes again to assess the state of searches for long-lived particles beyond the Standard Model at the LHC, brainstorm about new ideas for LLP searches, and focus on the future of LLP searches in HEP, both at the LHC and for future detectors and projects.

The format will likely be similar to that of our previous workshops, i.e., a working-workshop, where we focus on discussion and collaboration, with any talks functioning to set the stage for that collaboration.

The agenda will coalesce in the months leading up to the workshop, but in addition to the usual updates about the status of searches at the main LHC detectors and dedicated detectors, both operating and planned, we will likely have breakout working sessions devoted to -- but not limited to -- the following:

• What's next for LLP searches at the LHC?
• What didn't we get to cover in the first white paper?
• What triggers are missing for ATLAS, CMS, and LHCb for Run 3?
• What about future detectors and projects?  How well do we understand the full and complete capabilities of the upgrade plans for the main LHC detectors to have sensitivity to the discovery of LLPs versus planned dedicated detectors?
• What are we still overlooking with respect to LLPs at the HL-LHC?
• What's the hottest-and-latest about dedicated detectors such as milliQan, MOeDAL, MATHUSLA, CODEX-b, FASER, etc.?
• What about LLPs at next-generation projects like FCC, CEPC, ILC, CLIC?
• How can we fully leverage machine learning tools to facilitate the discovery of LLPs?

And yes, of course there will be at least one lightning round!  Please contact the organizers with your proposal or idea.

Note that while we hope to see you in person at CERN, remote participation will indeed be available via Vidyo.

More information soon!

Monday 27 May

09:30 → 09:40 Introduction to LLP Community

Speakers: James Beacham (Duke University (US)), Juliette Alimena (Ohio State University (US))

Beacham_LHC_LLP_CERN_Intro_2019May27_slim.pdf

logistics_LLPworkshop_27May2019.pdf

09:40 → 10:10 Theory Overview

Speakers: LianTao Wang (University of Chicago), Liantao Wang (University of Chicago (US))

LLP_th_CERN-1.pdf

10:20 → 10:45 ATLAS and CMS Overview

Speaker: Rachel Christine Rosten (The Barcelona Institute of Science and Technology (BIST) (ES))

2019_05_27_ATLAS_CMS_LLPs.pdf

10:45 → 11:15 Coffee break

11:15 → 11:35 LHCb and Belle 2 Overview

Speaker: Abi Soffer (Tel Aviv University (IL))

Soffer LLPwkshp May 2019.pdf

11:40 → 12:00 Heavy Ions Overview

Speaker: Andrea Giammanco (Universite Catholique de Louvain (UCL) (BE))

llp-workshop-cern-may2019.pdf

12:00 → 13:30 Lunch

13:30 → 14:15 Working Groups Kick-off Talks

13:30 Machine Learning for LLPs

Speaker: Ben Nachman (Lawrence Berkeley National Lab. (US))

ML4LLP.pdf

13:45 Simulation and reinterpretation

Speaker: Andre Lessa (CCNH - Univ. Federal do ABC)

reinterpretationLLP.pdf

14:00 Heavy neutral leptons

Speaker: Oliver Fischer (Karlsruhe Institute of Technology)

HNL-LLP_Kick-off.pdf

14:35 → 15:05 Coffee break

15:10 → 15:55 Dark Photon Discussion

15:10 Dark photons in ATLAS

Speaker: Cristiano Sebastiani (INFN Roma and Sapienza Universita' di Roma (IT))

dark_photon_models_atlas_27_05_19.pdf

15:25 Dark photons in CMS

Speakers: Marcus Hohlmann (Florida Institute of Technology (US)), Teruki Kamon (Texas A & M University (US))

190527_KineticMixing_DarkGaugeBoson_LLP_Workshop_Kamon_v2b.pdf

FIT_DarkPhoton_LLP_Workshop_CERN_May28_2019_v2a.pdf

15:35 Discussion

16:00 → 17:00 Parallel session: Heavy Neutral Leptons WG Preparation

Conveners: Federico Leo Redi (EPFL - Ecole Polytechnique Federale Lausanne (CH)), Oliver Fischer (Karlsruhe Institute of Technology)

16:00 Theory Overview

Speaker: Kyrylo Bondarenko

HNLs_as_LLP.pdf

16:10 Experimental Overview

Speaker: Martina Vit (Ghent University (BE))

LLPworkshop_MVit_Gent.pdf

16:00 → 17:00 Parallel session: Machine Learning WG Preparation

The Vidyo connection for the ML WG will be the one used for the workshop generally. Please scroll to the top of the agenda page and join from there.

Direct link:

https://client-select.web.cern.ch/?url=https%3A%2F%2Fvidyoportal.cern.ch%2Fjoin%2FLXTwi9WKyi

Conveners: Ben Nachman (Lawrence Berkeley National Lab. (US)), Gordon Watts (University of Washington (US)), Gregor Kasieczka (Hamburg University (DE)), Sergei Gleyzer (University of Florida (US))

16:00 Materials for discussion

Speakers: Ben Nachman (Lawrence Berkeley National Lab. (US)), Gordon Watts (University of Washington (US)), Gregor Kasieczka (Hamburg University (DE)), Sergei Gleyzer (University of Florida (US))

CalRatio_MLtechniques.pdf

Doc for minutes and ideas

llp-ml-survey-disappearing-tracks.pdf

LLPWorkshop_MLPrep_KPena.pdf

16:00 → 17:00 Parallel session: Simulation and Reinterpretation WG Preparation

Conveners: Andre Lessa (CCNH - Univ. Federal do ABC), Nishita Desai (LUPM, Montpellier), Sabine Kraml (LPSC Grenoble)

llpworkshopPrep.pdf

17:00 → 18:00 Capstone talks

17:00 Dark showers (remote talk)

Speaker: Simon Knapen (Institute for Advanced Study)

CERN_dark_showers_05_2019.pdf

17:30 Gaps in coverage ?

Speaker: David Anthony Milstead (Stockholm University (SE))

llp-gap.pdf

18:00 → 19:00 Drinks at Restaurant 1

Tuesday 28 May

09:00 → 10:30 Parallel session: Heavy Neutral Leptons WG Session 1

Conveners: Federico Leo Redi (EPFL - Ecole Polytechnique Federale Lausanne (CH)), Oliver Fischer (Karlsruhe Institute of Technology)

09:00 Presentation of theory articles

Speakers: Federico Leo Redi (EPFL - Ecole Polytechnique Federale Lausanne (CH)), Jan Hajer (Université catholique de Louvain), Zhen Liu (U of Maryland)

1_HNL_LHC_ZhenLiu_CERN2019.pdf

Heavy Neutrinos in displaced vertex searches at the LHC and HL-LHC.pdf

09:00 → 10:30 Parallel session: Machine Learning WG Session 1

The Vidyo connection for the ML WG will be the one used for the workshop generally. Please scroll to the top of the agenda page and join from there.

Direct link:

https://client-select.web.cern.ch/?url=https%3A%2F%2Fvidyoportal.cern.ch%2Fjoin%2FLXTwi9WKyi

Conveners: Ben Nachman (Lawrence Berkeley National Lab. (US)), Gordon Watts (University of Washington (US)), Gregor Kasieczka (Hamburg University (DE)), Sergei Gleyzer (University of Florida (US))

09:00 Materials for discussion

Speakers: Ben Nachman (Lawrence Berkeley National Lab. (US)), Gordon Watts (University of Washington (US)), Gregor Kasieczka (Hamburg University (DE)), Sergei Gleyzer (University of Florida (US))

LLP_Datasets.pdf

09:00 → 10:30 Parallel session: Simulation and Reinterpretation WG Session 1

Conveners: Andre Lessa (CCNH - Univ. Federal do ABC), Nishita Desai (LUPM, Montpellier), Sabine Kraml (LPSC Grenoble)

10:30 → 11:00 Coffee break

11:00 → 12:30 Parallel session: Heavy Neutral Leptons WG Session 2

The Vidyo link for the HNL Session 2 will be the same as for Session 1.

Direct link: https://client-select.web.cern.ch/?url=https%3A%2F%2Fvidyoportal.cern.ch%2Fjoin%2Fl5CIRMJ7Fz

Conveners: Federico Leo Redi (EPFL - Ecole Polytechnique Federale Lausanne (CH)), Oliver Fischer (Karlsruhe Institute of Technology)

11:00 Presentation of LHC analyses

Speakers: Elena Dall'Occo (Nikhef National institute for subatomic physics (NL)), Federico Leo Redi (EPFL - Ecole Polytechnique Federale Lausanne (CH)), Haifa Rejeb Sfar (University of Antwerp (BE)), Haifa Rejeb Sfar, Philippe Mermod (Universite de Geneve (CH))

ATLAS_dHNL.pdf

Haifa_sfar_LLPworkshop_28_05_19.pdf

LLP_Workshop(6).pdf

11:00 → 12:30 Parallel session: Machine Learning WG Session 2

The Vidyo connection for the ML WG will be the one used for the workshop generally. Please scroll to the top of the agenda page and join from there.

Direct link:

https://client-select.web.cern.ch/?url=https%3A%2F%2Fvidyoportal.cern.ch%2Fjoin%2FLXTwi9WKyi

Conveners: Ben Nachman (Lawrence Berkeley National Lab. (US)), Gordon Watts (University of Washington (US)), Gregor Kasieczka (Hamburg University (DE)), Sergei Gleyzer (University of Florida (US))

11:00 Materials for discussion

Speakers: Ben Nachman (Lawrence Berkeley National Lab. (US)), Gordon Watts (University of Washington (US)), Gregor Kasieczka (Hamburg University (DE)), Sergei Gleyzer (University of Florida (US))

11:00 → 12:30 Parallel session: Simulation and Reinterpretation WG Session 2

The Vidyo session for the Simulation and Reinterpretations Session 2 will be the same as Session 1.

Direct link: https://client-select.web.cern.ch/?url=https%3A%2F%2Fvidyoportal.cern.ch%2Fjoin%2FThv7cH2RoA

Conveners: Andre Lessa (CCNH - Univ. Federal do ABC), Nishita Desai (LUPM, Montpellier), Sabine Kraml (LPSC Grenoble)

12:30 → 14:00 Lunch

14:00 → 15:15 LLPs at the HL-LHC

Conveners: Livia Soffi (Sapienza Universita e INFN, Roma I (IT)), Zhen Liu (U of Maryland)

14:00 CMS Phase-2 MIP timing detector

Speaker: Livia Soffi (Sapienza Universita e INFN, Roma I (IT))

LLP-Workshop-CERN-2019.pdf

14:15 HL-LHC panorama at LHCb

Speaker: Xabier Cid Vidal (Universidade de Santiago de Compostela)

LLPs_Workshop_May19.pdf

14:30 LLP Opportunities at HL-LHC

Speaker: Zhen Liu (U of Maryland)

14_TimingLLP_ZhenLiu_CERNLLP2019.pdf

14:40 Discussion

15:15 → 16:40 How do we make Run 3 = Run LLP?

Conveners: Carlos Vazquez Sierra (Nikhef National institute for subatomic physics (NL)), Emma Torro Pastor (University of Washington (US)), Lawrence Lee Jr (Harvard University (US)), Steven Lowette (Vrije Universiteit Brussel (BE))

15:15 Introduction

kickoff_slides.pdf

15:20 CMS perspective

Speaker: Steven Lowette (Vrije Universiteit Brussel (BE))

190527_Lowette_LLPWorkshop_Run3eqRunLLP.pdf

15:30 ATLAS perspective

Speakers: Emma Torro Pastor (University of Washington (US)), Lawrence Lee Jr (Harvard University (US))

LLPsinRun3.pdf

15:40 LHCb perspective

Speaker: Carlos Vazquez Sierra (Nikhef National institute for subatomic physics (NL))

LHCb triggers for Run 3.pdf

15:50 Discussion

16:30 → 17:00 Coffee break

17:00 → 18:00 Lightning Round 1

Convener: Nishita Desai (LUPM, Montpellier)

17:00 Searching for 100 TeV Long-Lived Particles with LISA

Speaker: Devin Walker

backlight-LLP.pdf

17:15 Disappearing tracks at FCC

Speaker: Ryu Sawada (University of Tokyo (JP))

fcc_disappearing_track.pdf

17:30 Computer vision: prompt vs displaced

Speaker: Biplob Bhattacherjee (University of Calcutta, Department of Physics)

llp.pdf

17:45 CLIC

Speaker: Erica Brondolin (CERN)

20190528_LLP_LeograndeBrondolin.pdf

18:00 → 18:25 Capstone talk: Dark matter searches with soft displaced particles

Speaker: Susanne Westhoff (Heidelberg University)

LLP-workshop-280519-westhoff.pdf

20:00 → 23:00 Workshop Dinner (Brasserie des Halles de l’Île)

Wednesday 29 May

09:00 → 11:12 Dedicated Detectors Session

Convener: José Francisco Zurita (KIT)

09:00 FASER

Speaker: Yosuke Takubo (High Energy Accelerator Research Organization (JP))

faser190529.pdf

09:25 NA62

Speaker: Alina Kleimenova (Universite Catholique de Louvain (UCL) (BE))

lhc_llp2019_na62_kleimenova.pdf

09:40 SHiP

Speaker: Philippe Mermod (Universite de Geneve (CH))

Mermod_LHCLLP_May19.pdf

09:55 Codex-b

Speaker: Biplab Dey (CCNU)

CODEXb_LLP.pdf

10:10 MoEDAL

Speaker: Ameir Shaa Bin Akber Ali (Nanyang Technological University (SG))

5th LLP Workshop 2019-converted (5).pdf

10:25 MilliQan

Speakers: Albert De Roeck (CERN), Albert De Roeck (CERN)

deroeck_LLPCERN_2019_v3.pdf

10:40 MATHUSLA

Speaker: Emma Torro Pastor (University of Washington (US))

LLPworkshop_Mathusla.pdf

10:55 LLP BSM physics at neutrino near detectors

Speaker: Claudia Frugiuele

LLPworkshopCF.pdf

11:15 → 11:35 Coffee break

11:35 → 13:00 Working Groups Summary Talks

11:35 Machine Learning with LLPs Summary

Speaker: Gregor Kasieczka (Hamburg University (DE))

LLP_Summary.pdf

11:55 Heavy neutral leptons summary

Speakers: Federico Leo Redi (EPFL - Ecole Polytechnique Federale Lausanne (CH)), Oliver Fischer (Karlsruhe Institute of Technology)

LLP-summary-HNL-Redi.pdf

12:15 Simulation and reinterpretation summary

Speaker: Nishita Desai (LUPM, Montpellier)

LLP-summary.pdf

12:35 Dark Photon Conclusions

Speaker: Cristiano Sebastiani (INFN Roma and Sapienza Universita' di Roma (IT))

atlas_cms_displaceLeptonJet_discussion.pdf

12:45 Discussion

13:00 → 14:30 Lunch

14:30 → 15:45 Lightning Round 2

Convener: Brian Shuve (SLAC National Accelerator Laboratory)

14:30 Tracking technique for disappearing tracks

Speaker: Matthew Gignac (University of California,Santa Cruz (US))

2019_05_29_Tracking_LLPWorkshop.pdf

14:45 Displaced heavy neutrinos in B-L model at the LHC and beyond

Speaker: Suchita Kulkarni (Austrian Academy of Sciences (AT))

Kulkarni_LLP.pdf

15:00 Searches for right-handed neutrinos at accelerators

Speaker: Dr Jan Hajer (Université catholique de Louvain)

Searches for right-handed neutrinos at accelerators.pdf

15:15 The (Second) Higgs at the Lifetime Frontier

Speaker: Seth Koren

HiggsLLPs.pdf

15:30 Dark photons from B decays at HL-LHC using L1 Track Trigger

Speaker: Yuri Gershtein (Rutgers State Univ. of New Jersey (US))

LLWS_2019.pdf

15:45 → 16:15 Coffee break

16:15 → 17:15 Town Hall Discussion

16:15 Results From Survey

Speaker: Brian Shuve (SLAC National Accelerator Laboratory)

LHCLLP_townhall.pdf

16:25 Discussion

town hall notes

• more signature driven, but still have habit of relying on models. should work on new signatures. what topologies are we missing?
  • what format for these discussions?
  • blue-sky white paper?
  • need a least one representative model to convince people of trigger (in common between experiments)?
    • covered by simplified models in white paper?
• assess importance of workshop based on agenda
  • day-wise separation of working groups
  • easier to organize workshop and easier to plan for people to come
• one-week, once per year workshop at cern + smaller working group meetings throughout the year on video
• too early to influence HL-LHC?
  • no: L1 trigger TDR in CMS this year
    • room for readjustment after these documents come out
    • larger community could help influence here
• wide community influence before LHC, Tevatron, etc: need the same for HL-LHC, rather than technology-driven
• would American colleagues rather have a workshop in the US?
  • yes, strong general feeling
  • Berkley, Tawain workshops are great
  • North American influence lately has been less in these workshops
    • not sure if 1 main workshop + smaller workshops elsewhere would help with this?
• workshops at cern:
  • can often wander off and talk with other people at cern
  • more removed location forces everyone to stay and participate
  • although, 2 reasons to go to cern, easier to justify the expense of travel
• Berkley:
  • smaller group, people put their laptops away
• parts of the community that we’re not connecting with?
• HNL community: workshops very useful, for theorists and experimentalists
  • limited by manpower: the more that happens in workshops, the more interest generated, the more results we get

17:05 Wrap-Up