ESPPU Drafting day at RAL, 28 Apr 2025

Monday 28 Apr 2025, 10:30 → 17:35 Europe/London

Pickavance Lecture Theatre (RAL)

Davide Costanzo (University of Sheffield), Jim Clarke (STFC Daresbury Laboratory), Mark Williams (Edinburgh), Ruben Saakyan (UCL)

This is the third community drafting day for the 2026 European Strategy for Particle Physics Update (ESPPU). This will discuss further updates to the UK's national input following the deadline for community submissions on 31st March 2025. This meeting will discuss in detail:

• Updated information from project submissions.
• Prioritisation of alternative options (q3c and q3e) under various scenarios that might deem FCC unfeasible.
• Possible prioritisation of non-collider options.

 

Additional topics will likely be brought up for discussion following comments raised on the first draft of the UK's national input (available here: https://indico.stfc.ac.uk/event/1434/ ). 

To support the discussion and contribute to the development of the UK's input to the ESPPU, the community was invited to complete a survey. The results, reflecting responses from 185 participants, are provided in the attachment below.

Please note the discussions will run from 11am-5pm with arrival coffee available from 10.30am. 

Please bring Photo ID with on the day

As with previous meetings, a google doc is available for the community to provide input/comments ahead of time: https://docs.google.com/document/d/15SNHADkaVvm2Ad6lFY9H8Cig_kngbC1Hl7sVVD9ew_M/edit?tab=t.0#heading=h.fb3d6ytio7r8 

Old Meeting Link: https://ukri.zoom.us/j/95178297014

 

New ZOOM Link: https://ukri.zoom.us/j/94842543683

uk-esppu_survey.pdf

10:30 → 11:00 Arrival coffee

11:00 → 12:10 Introduction and digest of community inputs

Convener: Prof. Jim Clarke (STFC Daresbury Laboratory)

11:00 Introduction and aims of the meeting

Speaker: Ruben Saakyan (UCL)

Intro_RAL-28Apr2025.pdf

11:10 News from Collider Physics inputs

In this session, we aim to have 3 short "digests" of the various project submissions that will be available after the 31st March in the following 3 areas:
- Collider physics
- Non-collider physics
- Accelerator projects
For the two physics talks, the aim is not to try and perform the comparisons that will be performed by the Physics Preparatory Group ahead of the open symposium in Venice, but instead to highlight the new information made available that the community should consider in the prioritisation and scenario planning discussions scheduled throughout the drafting day. For the accelerator talk, we hope this will summarise any updated costings, proposed timescales and environmental impact studies as well as specific proposals for beam parameters (energy/luminosity) at particular sites.

Speaker: Josh McFayden (University of Sussex)

Collider Digest.pdf

11:30 News from Non-Collider Physics inputs

Speaker: Alex Keshavarzi (Manchester)

Non-Collider_Digest_April_28.pdf

11:50 News from Accelerator Physics inputs

In this session, we aim to have 3 short "digests" of the various project submissions that will be available after the 31st March in the following 3 areas:
- Collider physics
- Non-collider physics
- Accelerator projects
For the two physics talks, the aim is not to try and perform the comparisons that will be performed by the Physics Preparatory Group ahead of the open symposium in Venice, but instead to highlight the new information made available that the community should consider in the prioritisation and scenario planning discussions scheduled throughout the drafting day. For the accelerator talk, we hope this will summarise any updated costings, proposed timescales and environmental impact studies as well as specific proposals for beam parameters (energy/luminosity) at particular sites.

Speaker: Stewart Boogert (-)

2025_04_28_UK_ESPPU_NewsFromAcceleratorPhysicsInputs.pptx

ESPPU_project.xlsx

ESPPU_summary.xlsx

12:10 → 13:00 Session 1: FCC strategy in global context. Scenario planing.

Convener: Mark Williams (Edinburgh)

12:10 Updated discussions on 3c

Discuss specific answers to 3 of the 4 scenarios listed:

1. If Japan proceeds with the ILC in a timely way?
   (2. If China proceeds with the CEPC on the announced timescale?)
2. If the US proceeds with a muon collider?
3. If there are major new (unexpected) results from the HL-LHC or other HEP experiments?

(2) will be discussed as part of the 3e discussions

PlanB-Discussions-28Apr_RAL.pdf

12:45 Initial discussion on scenarios for consideration in 3e

The following scenarios will be considered separately

1. [Cost/technical/environmentally unfeasibility]- FCC is unaffordable or unfeasible on either cost or environmental grounds.
2. [International developments] - CEPC is realised.
3. [Timing]- Timescales for FCC are pushed back.

13:00 → 13:45 Lunch

13:45 → 14:45 Session 2: Alternative collider scenarios and accelerator R+D discussion

Convener: Davide Costanzo (University of Sheffield)

13:45 Prioritisation of alternative "plan B" scenarios

14:25 Further discussion of accelerator R+D topics (i.e. 3d)

14:45 → 15:45 Session 3: Priorities in non-collider experiments and complementary areas of exploration

Convener: Ruben Saakyan (UCL)

14:45 Neutrinos and Cosmic Messengers

15:00 Direct Dark Matter and Dark Sector

15:15 Non-Collider Flavour Physics

15:30 QTFP

15:45 → 16:15 Coffee

16:15 → 17:00 Session 4: Additional points raised by the community and cross-cutting themes