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    Community Meeting on Recommended Values for 0νββ NME

    → US/Pacific
    Description

    Zoom link: https://washington.zoom.us/j/98613165291?pwd=Dp8XxKrj35ybiUUTiPxix9kpgSiovJ.1

    video1588492351.mp4
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    AI-generated minutes (not edited by a human!)

     

    Quick recap

    The meeting, led by Jason Detwiler, focused on a proposal to create a community white paper providing recommended values and uncertainties for nuclear matrix elements (NMEs) relevant to neutrinoless double beta decay. Jason presented the motivation, goals, and proposed criteria for the evaluation, emphasizing the need for inclusive and transparent NME values for experimental planning and physics extraction. He outlined the structure of the draft white paper, which includes sections on methods, benchmarks, and recommended values for key isotopes. The discussion involved questions from participants like Ragnar and Steve about the criteria for inclusion and the process for handling competing calculations. The timeline for drafting and community involvement was discussed, with plans for regular meetings and collaboration through shared resources. The conversation ended with expressions of support for the initiative and instructions for further involvement.

     

    Next steps

    Jason

    • Post the recording of the meeting online.
    • Send the notice for the next community meeting to the BB NME evals email list.
    • Develop and agree on a style guide for the white paper, starting with a template from the G-2 effort.
    • Set up a file (e.g., JSON) containing recommended ranges and references for easy citation.

    Collaboration

    • All interested editors: Fill out the "When to Meet" poll to indicate preferred times for weekly editing meetings.
    • All interested contributors: Email the relevant section editors to get involved in editing the white paper draft.
    • All interested community members: Join the BB NME evals email list for updates and communications.
    • All community members: Direct students and colleagues to the meeting recording and materials to get involved.
    • Theorists with new calculations: Ensure results are accepted for publication by December 31st for inclusion in the current white paper iteration.
    • Editing team: Hold weekly editing meetings to work on the white paper draft.
    • Jason and team: Aim to have a special session or workshop at MEDx in 2027 to finalize the document for submission.

     

    Summary

     

    Neutrinoless Double Beta Decay Proposal

    Jason presented a proposal for a white paper on recommended values for neutrinoless double beta decay nuclear matrix elements. He explained the importance of accurate nuclear matrix elements for experimental measurements, comparing sensitivities across different isotopes, and making funding and experimental design decisions. Jason highlighted recent advancements in nuclear matrix element calculations, including the use of high-performance computing and chiral effective field theory, which have improved the accuracy of predictions and resolved the quenching problem in ordinary beta decay.

     

    Nuclear Matrix Element Standardization Proposal

    Jason discussed the challenges experimentalists face with nuclear matrix element calculations, emphasizing the need for accurate values with quantified uncertainties to ensure fair comparisons across experiments. He presented a proposal for a community-wide effort to create a white paper that would establish recommended nuclear matrix element values, with three main goals: agreeing on a shared vision, setting initial recommended ranges, and developing criteria for future evaluations. The proposed criteria for the first iteration focus on inclusivity and self-identification of state-of-the-art calculations, while the next iteration would involve more stringent requirements including proper treatment of correlations, quenching physics, and benchmarking against experimental observables.

     

    Nuclear Matrix Element Calculation Proposal

    Jason presented a proposal for nuclear matrix element calculations, outlining criteria for evaluation and a draft white paper structure. The discussion focused on validation requirements, with Jason explaining that methods would need to satisfy a subset of validation criteria including benchmarks like two-neutrino double beta decay. The team reviewed the draft white paper structure, which includes sections on calculations and methods, benchmarks, current recommended values, and future evaluation goals. Jason proposed an aspirational timeline to complete a first draft by fall and aim for publication acceptance by December 31st.

     

    White Paper Evaluation Plan

    Jason outlined a plan for a white paper on evaluations, including a timeline for drafting, editing, and finalizing the document by spring 2027, with a target journal being Physics Reports. He proposed holding weekly editing meetings and community meetings every 1-2 months, with updates to be communicated via email lists and a GitHub repository. The team plans to develop a style guide and create resources to help with citations and references.
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