# Past Workshops & Meetings

online

Neutrino-less double beta decay is the most sensitive probe of lepton number violation and a powerful tool to study the origin of neutrino masses. Currently, experimental efforts are gearing up for the so-called "tonne-phase" searches, with sensitivity reach of T_1/2 ~ 10^28 years. In the US, this phase is under the stewardship of the DoE Office of Nuclear Physics.

This workshop aims at defining experimental paths for studying neutrinoless double beta decay beyond the "tonne-scale" and at providing theoretical guidance. From the theoretical point of view, it is important to frame both discoveries or lack thereof made by the tonne-scale experiments. The experimental challenges include reaching ~100x higher sensitivity (T_1/2 ~ 10^30 years) and extracting more information from double-beta decay events. The workshop is organized in the broader context of the Snowmass 2021 process. It follows the collection of numerous DBD-flavored LOIs in Summer 2020, and is meant to define the main thrusts along which contributed papers will be prepared in 2021 and to identify both goals and the community to carry this program in the coming 1-2 decades.

Online

Realizing the full potential of experimental studies of nuclear matter requires a comprehensive understanding of the dynamics of its microscopic constituents, within the theory of quantum chromodynamics (QCD). Lattice QCD calculations have made significant contributions to our understanding of the strong interaction, but little is known from ab initio calculations about the dynamical properties of quarks and gluons. A central challenge for such calculations is the need to solve ill-posed inverse problems. This workshop will bring together practitioners in the field of lattice QCD and other communities working with inverse problems to address recent progress and remaining challenges in the extraction of dynamical properties from both numerical calculations and from experiment.

Co-organizers:

Martha Constantinou (Temple University)

Christopher Monahan (William & Mary/Jefferson Lab)

Alexander Rothkopf (Stavanger University)

ACFI Online

We hope to collectively orient the theoretical and phenomenological communities via an invitational forum, focusing on strategy for the forthcoming Snowmass process and influencing the proceeding, highly developmental years within the field in order to better serve the experimental community interested in baryon number violation (BNV), and more specifically, BNV by two units (ΔB=2), a B-L violating possibility. This looks forward to the application of theoretical ideas to the interpretation of future measurements made by the ESS NNBar Collaboration, DUNE, PNPI Gatchina, and Hyper-Kamiokande in the realm of dinucleon decay and neutron-antineutron transformations (n→n ̅). These ideas can be applied to existing and future theoretical and experimental studies, bolstering the community’s fundamental understanding of the topic.

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)

LGRT 419B

Proton decay experiments strongly constrain models in which baryon number is violated. Typical models must be associated to very high-energy scales to be viable, making them hard to probe with independent methods. An interesting class of models, which has gained significant attention in recent years, still violate baryon number but only by two units such that the proton remains stable. The last years have seen interesting developments in the associated particle, hadronic, and nuclear theory and the connection to outstanding cosmological problems such as the matter-antimatter asymmetry. In addition, future measurements made by the ESS NNBar Collaboration, DUNE, PNPI Gatchina, and Hyper-Kamiokande in the realm of dinucleon decay and neutron-antineutron transformations have real discovery potential.

In this focused workshop, we wish to bring together practitioners of the various communities, both theoretical and experimental, to discuss what are the challenges and prospects for the detection of baryon number violation in the near future, and what would be the implication of signals or lack thereof.

Co-Organizers:

Joshua Barrow (Fermilab)

Leah Broussard (Oak Ridge National Lab)

Jordy de Vries (UMass Amherst)

Michael Wagman (MIT)

LGRT 1033

The swampland program is an extremely rapidly growing topic in formal particle theory. The goal of the program is to identify universal features of quantum gravities, with the potential to generate experimentally testable predictions.

Co-organizers:

Ben Heidenreich (UMass Amherst)

Matteo Lotito (UMass Amherst)

Daniel Harlow (Massachusetts Institute of Technology)

Matthew Reece (Harvard University)

Irene Valenzuela (Harvard University)