Theoretical Innovations for Future Experiments Regarding Baryon Number Violation by Two Units I

Date: 
Monday, August 3, 2020 - 9:00am to Thursday, August 6, 2020 - 5:00pm
Location: 

ACFI Online

The overarching topic of the workshop is the violation of Baryon-minus-Lepton (B-L) number. B-L number is exactly conserved in the Standard Model, but the observed matter-antimatter asymmetry of the universe hints that beyond the Standard Model B-L violating processes could exist. Proton decay (PDK) experiments set very strong limits on B-violating interactions (though most conserve B-L), pointing towards very high-energy scales around 〖10〗^13 TeV; however, models exist where the proton is stable while B is still not a good symmetry (for instance, if B is only violated by two units, i.e. ΔB=2). Such models lead to unique and powerful experimental signatures such as the transformations of neutrons into antineutrons (n→n ̅, similar to kaon-antikaon oscillations due to strangeness-changing weak interactions) or decays of otherwise stable nuclei via dinucleon annihilation.

Recent years have seen significant theoretical developments of various aspects of these intriguing scenarios, and models have been created that naturally avoid PDK limits while solving other problems within the Standard Model such as the matter-antimatter asymmetry of the universe. Lattice-QCD calculations have made tremendous improvements in calculating QCD matrix elements that connect B-violating quark interactions to observables. Studies in effective field theories for B-violating nuclear interactions have been initiated and applied to light nuclei, while novel intranuclear simulations have been developed to assess whether dinucleon decay processes can be separated from background in medium-heavy nuclei. At the same time, the prospects for future experiments look good: The European Spallation Source, DUNE, PNPI Gatchina, and Hyper-Kamiokande are all expected to attain significantly increased sensitivities to B-L violation.
Despite these recent exciting developments, the collective particle, lattice-QCD, nuclear, and experimental communities are currently rather disjoint and do not meet very often (if at all) to discuss strategy and theoretical necessities for mutualistic progress in the field. A major goal of this workshop is to bring together representatives across these communities to discuss what major challenges exist, what the prospects are for discovering ΔB=2 violation in future experiments, and the interpretation of experimental signals or limits in the broader context of B-L violation.

Furthermore, the US particle physics community is preparing to identify and rank scientific priorities with the goal of shaping the physics program for the next few decades as part of the Snowmass process, which will initiate in the next year. A springtime workshop frame ensures that we can better serve the experimental community interested in BNV by surveying the opportunities in experiment and theory in order to build the foundation for the strategy for Snowmass. This will allow for in-depth planning for both topics and convener strategies in order to be noticed within the broader field.

https://indico.fnal.gov/event/44472/timetable/#20200803

Co-organizers:
Joshua Barrow (University of Tennessee)
Leah Broussard (Oak Ridge National Laboratory)
Jordy de Vries (University of Massachusetts Amherst/Riken Brookhaven)
Michael Wagman (Fermi National Accelerator Laboratory)

Schedule

2020-08-03
Monday, August 3
10:00am
Talk & Questions

Rabindra Mohapatra

University of Maryland

Monday, August 3
10:30am
Talk & Questions

Robert Shrock

Stony Brook University

Monday, August 3
11:00am
Monday, August 3
11:30am
Talk & Questions

Valentina Santoro

European Spallation Source

Monday, August 3
12:00pm
Monday, August 3
12:30pm
Talk & Questions

Linyan Wan

Boston University

Monday, August 3
1:00pm
Talk & Questions

Yeon-jae Jwa

Columbia University

Monday, August 3
1:30pm
Talk & Questions

Mike Snow

Indiana University

Monday, August 3
2:00pm
Writing Session

Snowmass Whitepaper

2020-08-04
Tuesday, August 4
10:00am
Talk & Questions

Bing Wei Long

Sichuan University

Tuesday, August 4
10:30am
Talk & Questions

Jean-Marc Richard

Institut de Physique Nucleaire de Lyon

Tuesday, August 4
11:00am
Tuesday, August 4
11:30am
Talk & Questions

Bing Wei Long, Jean-Marc Richard, Jordy De Vries

Tuesday, August 4
12:00pm
Tuesday, August 4
12:30pm
Talk & Questions

Sergey Syritsyn

Stony Brook University

Tuesday, August 4
1:00pm
Talk & Questions

Bhupal Dev

Washington University in St. Louis

Tuesday, August 4
1:30pm
Tuesday, August 4
2:00pm
Writing Session

Snowmass Whitepaper

2020-08-05
Wednesday, August 5
10:00am
Talk & Questions

James Wells

University of Michigan

Wednesday, August 5
10:30am
Search for NNbar with UCN

Alexey Fomin

NRC "Kurchatov Institute" - PNPI

Wednesday, August 5
11:00am
Wednesday, August 5
11:30am
Talk & Questions

Zurab Berezhiani

Università dell'Aquila

Wednesday, August 5
12:00pm
Wednesday, August 5
12:30pm
Talk & Questions

Yuri Kamyshkov

University of Tennessee, Knoxville

Wednesday, August 5
1:00pm
Talk & Questions

Marcel Demarteau

Oak Ridge National Laboratory

Wednesday, August 5
1:30pm
Past & Future Snowmass Discussion

Gustaaf Brooijmans, Yuri Kamyshkov, Albert Young, Leah Broussard, Georgia Karagiorgi, Bhupal and Josh Barrow

Wednesday, August 5
2:00pm
2020-08-06
Thursday, August 6
10:00am
Talk & Questions

Susan Gardner

University of Kentucky

Thursday, August 6
10:30am
Talk & Questions

Julian Heeck

University of California, Irvine

Thursday, August 6
11:00am
Thursday, August 6
11:30am
Talk & Questions

Sudhakantha Girmohanta

Stony Brook University

Thursday, August 6
12:00pm
Thursday, August 6
12:30pm
Talk & Questions

David McKeen

TRIUMF

Thursday, August 6
1:00pm
Writing Session

Snowmass Whitepaper