Searches for long-lived particles at the LHC: Second workshop of the LHC LLP Community

17 Oct 2017, 16:00 → 20 Oct 2017, 18:00 Europe/Zurich

Giambiagi Lecture Hall (ICTP, Trieste, Italy)

Albert De Roeck (CERN), Bobby Samir Acharya (Abdus Salam Int. Cent. Theor. Phys. (IT)), Brian Shuve (SLAC National Accelerator Laboratory), James Beacham (Ohio State University (US)), Xabier Cid Vidal (Universidade de Santiago de Compostela)

- - - - - See below for a special pre-workshop lecture by Steven Weinberg - - - - -

Building upon the groundwork laid by the LHC Long-Lived Particle (LLP) Workshop in April of 2017 -- 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, and MATHUSLA -- convenes again to finalize the community white paper and assess the state of LLP searches at the LHC.

This workshop is the second of two workshops devoted to producing an LHC LLP white paper that proposes a set of simplified models for LLP searches; contains an enumeration of gaps in the coverage of classes of BSM models that can produce LLPs; proposes recommendations for new triggering strategies for LLPs in ATLAS, CMS, and LHCb; lists ideas for new searches for LLPs; and proposes a set of recommendations for the presentation of search results to ensure future reinterpretation and recasting.

We will have three days of talks and breakout working sessions that will be geared toward finalizing the white paper and discussing the results produced by the working groups / chapter groups over the summer:

WG 1: Simplified models

• A set of simplified models has been proposed.  Is anything missing?
• Contacts to get involved: B. Shuve, D. Curtin, J. Shelton, Z. Liu, J. Evans, M. Ramsey-Mulsof (at Trieste), J. Zurita (at Trieste)

WG 2: Experimental coverage & recommendations for new searches

• What gaps in coverage exist that should motivate new, improved, and/or expanded searches?
• Contacts to get involved: A. de Roeck (in Trieste), J. Zurita (in Trieste), X. Cid Vidal (in Trieste), H. Russell, D. Curtin, J. Evans

WG 3: Triggers, detector upgrades, and HL- / HE-LHC

• A few concrete, missing triggers in CMS and ATLAS were identified at the April workshop.  What did we miss that we've identified since then?  What studies have been performed to support possible detector upgrades that would improve sensitivity to LLP signatures?  What about the prospects, challenges, and opportunities with a high luminosity or a high energy (~25 TeV) LHC?  New, blue-sky ideas mandatory.
• Contacts to get involved: M. Borsato (in Trieste), A. Coccaro, Y. Cheng

WG 4: Re-interpretations & recommendations for the presentation of search results

• How do we make sure the published searches are optimally useful in the future?  What optimal set of information should be presented in experimental search results?  How do we encourage the collaborations to archive their analyses in a way that will enable the future production of accurate, robust, and experiment-controlled re-casting?
• Contacts to get involved: J. Alimena (in Trieste), G. Hesketh (in Trieste), W. Buttinger (in Trieste)

WG 5: Dark showers

• How do we address dark sectors with hadronization in a more detailed and comprehensive way, and what does this mean for the current searches in the experimental collaborations for this class of models?
• Contacts to get involved: J. Scholtz (in Trieste), C. Cesarotti (in Trieste), J. Shelton, S. Knapen
• Dedicated CERN egroup: llp-darkshowers

The first day of the workshop will, in addition, feature a joint session with the Re-interpretations workshop concluding that same day at Fermilab, in their morning and the afternoon in Trieste.

The next LHC LLP Community workshop will take place in the Spring of 2018.

- - - - - Note: Pre-workshop event  - - - - -

- - - - - Steven Weinberg lecture - - - - -

We're pleased to announce a special event on the 17th of October, the day before the workshop proper begins: Steven Weinberg is giving a talk in honor of the fact that October 17 is the 50th anniversary (to the day!) that his foundational paper, “A Model of Leptons”, -- without which probably none of us would be reading this -- was submitted to PRL, and our ICTP hosts have astutely arranged for a celebration including a talk broadcast live by Weinberg on “50 years of the SM” in the late afternoon of 17 October, followed by a reception.  We’re quite fortunate to have this connected to our workshop, and we encourage you to arrange to show up early on the 17th to be able to attend!

- - - - - Remote connection - - - - -

We're using Skype!  Join here:

https://join.skype.com/kuFeZLCexheb

- - - - - Workshop photo - - - - -

With text

Original

 

 

Tuesday 17 October

1 Fifty Years of the Standard Model

October 17 is the 50th anniversary (to the day!) that the foundational paper, “A Model of Leptons”...

https://inspirehep.net/record/51188

...was submitted to PRL, and Weinberg has agreed to broadcast a talk to our workshop in honor of the occasion.

Watch remotely on ITCP's YouTube channel:

https://youtu.be/mX2R8-nJhLQ

Speaker: Prof. Steven Weinberg (UT Austin)

2 Reception

Wednesday 18 October

3 Welcome to ICTP

Speaker: Bobby Samir Acharya (Abdus Salam Int. Cent. Theor. Phys. (IT))

4 Introduction

Speaker: James Beacham (Ohio State University (US))

Beacham_LHC_LLP_Trieste_Intro_2017Oct18.pdf

5 Long-lived particles at the LHC in context

Speaker: Michael Ramsey-Musolf (U. Massachusetts Amherst)

MJRM LLP Trieste 17.pdf

6 Snapshot of current long-lived particle results at LHCb

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

LHCb_LLP_CVS.pdf

7 Snapshot of current long-lived particle results at CMS

Speaker: Albert De Roeck (CERN)

deroeck_trieste_v4.pdf

deroeck_trieste_v4.pptx

11:10 Coffee

8 Snapshot of current long-lived particle results at ATLAS

Speaker: Karri Folan Di Petrillo (Harvard University (US))

kdpATLASLPP.2017.pdf

9 Workshop goals and white paper status

Speaker: James Beacham (Ohio State University (US))

Beacham_LHC_LLP_Trieste_Goals_2017Oct18.pdf

13:00 Lunch -- working group meet-and-greets over food

Lightning round: New ideas -- Session 1

10 Large radius tracking in ATLAS

Speaker: Margaret Susan Lutz (University of Massachusetts (US))

LargeRadiusTrackingTrieste181017.pdf

11 ATLAS Fast TracKer (FTK) -- Info, status, and prospects

Speaker: Tova Ray Holmes (University of Chicago (US))

17-10-13-LLPWorkshop.pdf

12 ATLAS Fast TracKer (FTK) -- Overview of triggering constraints

Speaker: Lesya Horyn (University of Chicago (US))

Horyn_LLP_FTK.pdf

13 Upgrade studies at CMS in the context of LLPs

Speaker: Henning Keller (Rheinisch Westfaelische Tech. Hoch. (DE))

UpgradeStudies_LLPsv2.pdf

15:38 Coffee

Joint session with Re-interpretations Workshop at Fermilab

14 Re-interpretations and recasting of LLP searches from the experimentalist viewpoint

Live from ICTP

Speaker: Gavin Hesketh (University College London (UK))

LLP_gavin.pdf

LLP-photo.JPG

15 Re-interpretations and recasting of LLP searches from the theorist viewpoint

Live from Fermilab

Speaker: Jared Evans

LLP-Recasting.pdf

16 Discussion

18:00 Vino e formaggio

Thursday 19 October

17 Simplified models for LLPs -- The LHC LLP Community proposal

Speaker: Brian Shuve (SLAC National Accelerator Laboratory)

SimplifiedModelDraft.pdf

simplified_model_Shuve.pdf

18 Simplified models proposal -- open discussion

Speaker: Michael Ramsey-Musolf (U. Massachusetts Amherst)

IMG_0451.JPG

10:30 Coffee

19 Re-interpretations and recommendations for the presentation of search results

Follow-up discussion from previous day's joint session with Fermilab and conclusion of recommendations

Speaker: Juliette Alimena (Ohio State University (US))

IMG_0452.JPG

reinterpretationsDiscussion_TriesteLLPWorkshop_19October2017.pdf

12:00 Lunch

20 Experimental coverage -- Overview

Speaker: José Francisco Zurita (KIT)

LLP_EXP_coverage_report_v2.pdf

21 Experimental coverage -- Discussion and brainstorming

Speaker: José Francisco Zurita (KIT)

2017-10-19 15.16.49.jpg

2017-10-19 15.16.53.jpg

2017-10-19 15.16.57.jpg

15:00 Coffee

22 Experimental coverage -- Part 2

20:00 Workshop dinner

The workshop dinner will be at da Pino in Trieste.

https://goo.gl/maps/3Ri8FVgB7Nn

Be there at 20h!

Friday 20 October

23 Triggers and upgrades for LLP searches -- Part 1

Speakers: Cristiano Alpigiani (University of Washington, Seattle), Elena Dall'Occo (Nikhef National institute for subatomic physics (NL)), Jessica Prisciandaro (Universidade de Santiago de Compostela (ES)), Yangyang Cheng (Cornell University (US))

10:20 Coffee

24 Triggers and upgrades for LLP searches -- Part 2

Speakers: Alexander Ledovskoy (University of Virginia (US)), Lindsey Gray (Fermi National Accelerator Lab. (US)), Yuri Gershtein (Rutgers State Univ. of New Jersey (US))

25 Brainstorming on the future of LLP searches: Upgrades, high-luminosity and high-energy (~25 TeV) LHC possibilities

Group brainstorming session

Speakers: Martino Borsato (Universidade de Santiago de Compostela (ES)), Roberto Franceschini (Rome 3 U.)

12:10 Lunch

26 Dark showers

Speakers: Carissa Joyce Cesarotti (Johannes Gutenberg Universitaet Mainz (DE)), Jakub Scholtz (UW Seattle), Jakub Scholtz (Harvard), Jakub Scholtz (University of Washington), Siddharth Mishra Sharma (Universidad de Cantabria (ES)), Siddharth Mishra Sharma (Princeton University)

15:00 Coffee

Lightning round: New ideas -- Session 2

27 A new variant of dark matter freeze-out predicting long-lived particles at the LHC

1705.09292

Speakers: Jan Heisig (RWTH Aachen University), Jan Heisig (RWTH Aachen University)

Heisig_LLP_WS_Trieste.pdf

28 MATHUSLA status and update

Speaker: Audrey Katherine Kvam (University of Washington (US))

Kvam_MATHUSLA.pdf

29 ATLAS displaced jets search: Past, present, future

Speakers: Nina Anikeeva (University of Washington), Nina Anikeeva (University of Washington (US))

MSVxTrieste.pdf

30 Monopoles at the LHC: ATLAS HIP search, Moedal, ATLAS/CMS beam pipe initiative

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

Mermod_LHCLLP_Oct17.pdf

31 Summary and taking stock

Speaker: Sascha Mehlhase (Ludwig Maximilians Universitat (DE))

2017-10-20 LLP.pdf