Zoom Meeting ID and password:
Meeting ID: 623 9979 0243
Passcode: 10000000
Introduction to the meeting:
This is the first town hall meeting of the Initiative for Dark Matter in Europe and beyond (iDMEu), a JENA (Joint ECFA-NuPECC-APPEC) activity to bring together researchers from different communities searching for dark matter.
It takes place on the last day of the XVIII International Conference on Topics in Astoparticle and Underground Physics (TAUP2023), at the University of Vienna (in Seminar Room 1, see here) and online on Zoom.
In this kick-off, we will have three talks of general interest on experimental and theoretical directions. During this town hall meeting, we will also present the virtual platform for the dark matter meta-repository developed by the organizers and Early Career curators.
There will be plenty of time for discussion after the talks, as well as space to talk about the feedback on the virtual platform.
Coffee will be available in the meeting room prior to starting the meeting, and we will open the virtual room at 14:15 for anyone who may want to have informal discussions prior to the talks starting at 14:30. The coffee and the room hosting are possible thanks to the sponsorship of ECFA, APPEC and NuPECC.
Live notes:
https://docs.google.com/document/d/1vL7p6tU_wgiUz-_3E4Tby598L1XqSGsNVSKvgaNhJck/edit?usp=sharing
iDMEu town hall @ TAUP - 01/09/2023
Introductory talks
Main goal: building a permanent platform to discuss DM among different communities via:
Additional goal: help build a coherent story on DM for different audiences
JENA = Joint Activities of ECFA, NuPECC and APPEC
JENAS = Seminar with members of all different community
Expressions of interest on different topics beyond iDMEu: GW, ML optimisation, Neutron EDM…all recognised as overarching community initiatives.
Recent activities:
iDMEu website talks - part 1
Preliminary website (beta version) at: http://nectarclient.co.uk/idmeu/
Curators: undergraduate students who do a project (generally review + a hands-on part) and postdocs devoting part of their time to maintaining website
Functionalities:
Scientific talks
Very large DM landscape (couplings/mass)
What does a DM physicist/phenomenologist wish for?
“Usual” complementarity: ID, DD and colliders, some discussion points.
Topic 1: examples of interplay, with complications.
Topic 2: Impact of relic density on experimental constraints
Q&A
Q (Georgia Karagiorgi (?)): As a direct DM experimentalist, it looks like there are ideas of models that come up and then they aren’t mentioned again - cycles of popularities, how do we follow up?
A: DD is very good at constraining many models, difficult to have single models that are fully constrained or fully open, maybe one could make a list.
Comment (Marco Cirelli): at the moment, most popular: sub-GeV for electron scattering, axions.
Q: Clarify the DD/collider invisible Higgs plots and the assumptions.
A: the way the plot is made is assuming that all DM is contributing to the Higgs invisible width, so you can set a constraint on DM based on the constraint on invisible Higgs decay. Follow up offline.
How the ECFA detector roadmap can help answer a number of mysteries of our universe through discoveries? Data-driven era when we need instruments for answers.
Long-term planning starting with 2019 European Strategy Update, now creating Detector R&D (DRD) collaborations where people commit to working on a given topic, similar to general conditions for execution of CERN experiments.
DRD areas relevant to DM:
Organization & resources for a DRD collaboration: see slide, important points and timescales there.
Quantum and emerging technologies = rapidly emerging areas of technology development to study fundamental physics and many DM models. → covered in DRD5.
Q: how to get involved at this stage?
A: DRDs tried to contact the communities, so to get in touch find the webpage for each of the DRDs and contact the organisers (a new slide will be added). Next talk will have specific examples.
Liquid detectors as use case, what has been going on in this area.
Physics: neutrinos, dark matter, neutrinoless double-beta decays…
Technologies: liquid scintillator, noble liquid, water cherenkov…
Different physics goals, common challenges:
Liquid detector R&D: four different groups with subgroups, example, Charge readout is the group with pixel charge & light as one of the subgroups
Liquid detectors for DM: Argon/Neon/Xenon, examples of how they are used and what they access (parallel between DM noble liquid TPCs for direct DM detection and neutrino LAr TPCs for indirect dark sector access), and what the main issues are especially in scalability.
Many R&D areas for liquid detector with synergies between science topics, will create a network of R&D facilities and shared resources. Links to participate are on the slides.
→ can iDMEu have the link to help advertise?
A: links should be on the website - people can follow them and get to a place where there is information about status. Initially there was one place to find everything, but then with time things got a bit disjoint and not everything in the same place.
Early page, with everything: https://indico.cern.ch/event/957057/page/27294-implementation-of-the-ecfa-detector-rd-roadmap but the links are not the most up to date there → ECFA detector leadership will make one page only, and that is the page to link. There is one slide by
[idea for website: add a “roadmaps for DM” page including APPEC, European Strategy document, DRD. Help with this. ]
Q: what happens in the Selenium case?
A: this has to do with e/hole pair creation, but would have to look it up
Q: enhanced photosensitivity for liquid chambers, where does it help? Discrimination, or charge signals?
A: Both, can help also in improving energy resolutions
Snowmass: similar process to European Strategy Update but broader in scope (all of particle physics, including astrophysics, neutrino and intensity frontier), giving input to prioritisation in the next decade.
Complementarity effort: see report https://arxiv.org/abs/2210.01770 and short version https://arxiv.org/abs/2211.07027, containing:
Q: how do you identify priorities when you have budget restrictions?
A: US-based answers - there are some priorities that were highlighted and scenarios of what could be cut. But in any case we need experiments that are complementary to each other.
Comment (CD): going in with a united front and highlighting good things of other experiments in addition to good things of one’s own experiment will lead to better funding results than only highlighting one experiment at a time.
Q: What if I don’t have enough money for everything, what do we do? We can face this problem, and it’s difficult - prioritising means you choose. From the theory reviewer point of view then it’s hard…
A: there are experiments that do more than what they were designed for (e.g. LHCb and dark sectors, CMS triggering for GeV-level…), so think about this before descoping experiments?
Comment (CD): this can include the discussion of “popularity contest” for themes
A: we have an infinite parameter space, we want to do everything in every way. So how do we show that we aren’t asking for everything?
Comment (CD): prioritisation can be helped by theory community: what theory is robust && promising and we should look there? And how do we do the most things possible with one experiment?
Deborah: let’s look at broader picture, general experiments.
Federica: it’s true that we don’t have funding for everything, but we need to go in with a collaborative mindset rather than with an exclusively competitive.
iDMEu website talks - part 2
Interactive session on why/if an online forum would be useful, see slides.
Results of the polls:
Why would(n't) you use a DM internet forum?
8
Would be nice to openly discuss hot topics timely for people who do not use twitter.
To ask questions
would need to make sure it is established, otherwise waste of time... --> where ist the threshold for "established", how to measure this? How do people know this?
I would but not sure how sustainable it will be since forums seem to be losing popularity in the Internet and young people may not engage
I could use it, just now I don’t know.
To find answers to questions I might have 😊
DM stackoverflow 😊
To ask questions
What forum topics would you suggest and what comments would you have on the existing topics?
3
like "Arxiv of the day", which will be completely deleted after a week/month?
create platform for students and postdocs to discuss their experience on daily work of the experiments as help for choosing next job
Seeking explanation from experts