Abstract
Processes that violate baryon number, most notably proton decay and nn¯ transitions, are promising probes of physics beyond the Standard Model (BSM) needed to understand the lack of antimatter in the Universe. To interpret current and forthcoming experimental limits, theory input from nuclear matrix elements to UV complete models enters. Thus, an interplay of experiment, effective field theory, lattice QCD, and BSM model building is required to develop strategies to accurately extract information from current and future data and maximize the impact and sensitivity of next-generation experiments. Here, we briefly summarize the main results and discussions from the workshop ‘INT-25-91W: Baryon Number Violation: From Nuclear Matrix Elements to BSM Physics,’ held at the Institute for Nuclear Theory, University of Washington, Seattle, WA, 13–17 January 2025.
| Original language | English |
|---|---|
| Article number | 083001 |
| Journal | Journal of Physics G: Nuclear and Particle Physics |
| Volume | 52 |
| Issue number | 8 |
| DOIs | |
| State | Published - Aug 31 2025 |
Funding
We thank the Institute for Nuclear Theory at the University of Washington for hosting this workshop INT-25-91W, supported by the INT’s U.S. Department of Energy Grant No. DE-FG02-00ER41132 and the Swiss National Science Foundation under Project No. PCEFP2_181117. The work of L.J.B. was supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics (contract DE-AC05-00OR22725). A.C. and M. H. acknowledge support by the Swiss National Science Foundation (Project Nos. PP00P21_76884 and TMCG-2_213690). S.S. is supported by the US National Science Foundation under Award PHY-2412963. This manuscript has been authored by Fermi Forward Discovery Group, LLC under Contract No. 89243024CSC000002 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics. Y.A. thanks Yoshinobu Kuramashi, Eigo Shintani and Ryutaro Tsuji (through PACS collaboration) for their collaboration on the project, which is supported in part by the MEXT Program for Promoting Researches on the Supercomputer Fugaku: Large-scale lattice QCD simulation and development of AI technology, JPMXP1020230409. A.B.B. acknowledges funding from the Spanish ‘Agencia Estatal de Investigaci’on,’ MICIN/AEI/10.13039/501100011033, and from the grant CIACIF/2021/061. He also thanks Juan Herrero Garc’ia, Arcadi Santamaria, John Gargalionis, and Michael Schmidt for their collaboration on the work presented here. The work of Z.B. was partially supported by the research Grant No. 2022E2J4RK “PANTHEON: Perspectives in Astroparticle and Neutrino THEory with Old and New messengers” under the program PRIN 2022 (Mission 4, Component 1, CUP I53D23001110006) funded by the Italian Ministero dell’Università e della Ricerca (MUR) and by the European Union— Next Generation EU. N.F.C. thanks the Hyper-Kamiokande Collaboration and INFN for their support. S.G. thanks the organizers for the opportunity to contribute to this document, despite her unexpected inability to attend, as well as Jeffrey Berryman and Mohammadreza Zakeri for their collaboration on the work presented here, and she acknowledges support from the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-FG02- 96ER40989. J.H. thanks Diana Sokhashvili and Anil Thapa for collaboration on some of the work presented here and acknowledges support by the U.S. Department of Energy under Grant No. DE-SC0007974 and a 4-VA at UVA Collaborative Research Grant. C.J. thanks Yuxiang Hu, Wanlei Guo, LiangJian Wen, and JUNO collaboration for their collaboration in the research presented here. A.A.P.’s research was supported in part by the US Department of Energy grant DE-SC0024357. He thanks Martin Beneke and Gael Finauri for the collaboration on the work presented here. The research of R.S. was supported in part by the U.S. National Science Foundation grant NSF-PHY-22-10533. He thanks S. Girmohanta, I. Goldman, R. Mohapatra, and S. Nussinov for collaboration on the results presented here. A. T. thanks Mohammadreza Zakeri and Rouzbeh Allahverdi for the collaboration on the work presented here and acknowledges support in part by the DOE grant DE-SC0010143. The work of U.v.K. was supported in part by the US Department of Energy, Office of Science, Office of Nuclear Physics, under award DE-FG02-04ER41338. He acknowledges the essential contribution to the work reported here from his collaborators Femke Oosterhof, Jordy de Vries, Bingwei Long, and Rob Timmermans. J.W. thanks Lund University and ESS for their support of his travel and D. Milstead for figure 2. We thank the Institute for Nuclear Theory at the University of Washington for hosting this workshop INT-25-91W, supported by the INT’s U.S. Department of Energy Grant No. DE-FG02-00ER41132 and the Swiss National Science Foundation under Project No. PCEFP2_181117. The work of L.J.B. was supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics (contract DE-AC05-00OR22725). A.C. and M.H. acknowledge support by the Swiss National Science Foundation (Project Nos. PP00P21_76884 and TMCG-2_213690). S.S. is supported by the US National Science Foundation under Award PHY-2412963. This manuscript has been authored by Fermi Forward Discovery Group, LLC under Contract No. 89243024CSC000002 with the U.S. Department of Energy, Office of Science, Office of High Energy Physics. Y.A. thanks Yoshinobu Kuramashi, Eigo Shintani and Ryutaro Tsuji (through PACS collaboration) for their collaboration on the project, which is supported in part by the MEXT Program for Promoting Researches on the Supercomputer Fugaku: Large-scale lattice QCD simulation and development of AI technology, JPMXP1020230409. A.B.B. acknowledges funding from the Spanish ‘Agencia Estatal de Investigaci’on,’ MICIN/AEI/10.13039/501100011033, and from the grant CIACIF/2021/061. He also thanks Juan Herrero Garc’ia, Arcadi Santamaria, John Gargalionis, and Michael Schmidt for their collaboration on the work presented here. The work of Z.B. was partially supported by the research Grant No. 2022E2J4RK “PANTHEON: Perspectives in Astroparticle and Neutrino THEory with Old and New messengers” under the program PRIN 2022 (Mission 4, Component 1, CUP I53D23001110006) funded by the Italian Ministero dell’Università e della Ricerca (MUR) and by the European Union—Next Generation EU. N.F.C. thanks the Hyper-Kamiokande Collaboration and INFN for their support. S.G. thanks the organizers for the opportunity to contribute to this document, despite her unexpected inability to attend, as well as Jeffrey Berryman and Mohammadreza Zakeri for their collaboration on the work presented here, and she acknowledges support from the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under contract DE-FG02-96ER40989. J.H. thanks Diana Sokhashvili and Anil Thapa for collaboration on some of the work presented here and acknowledges support by the U.S. Department of Energy under Grant No. DE-SC0007974 and a 4-VA at UVA Collaborative Research Grant. C.J. thanks Yuxiang Hu, Wanlei Guo, LiangJian Wen, and JUNO collaboration for their collaboration in the research presented here. A.A.P.’s research was supported in part by the US Department of Energy grant DE-SC0024357. He thanks Martin Beneke and Gael Finauri for the collaboration on the work presented here. The research of R.S. was supported in part by the U.S. National Science Foundation grant NSF-PHY-22-10533. He thanks S. Girmohanta, I. Goldman, R. Mohapatra, and S. Nussinov for collaboration on the results presented here. A.T. thanks Mohammadreza Zakeri and Rouzbeh Allahverdi for the collaboration on the work presented here and acknowledges support in part by the DOE grant DE-SC0010143. The work of U.v.K. was supported in part by the US Department of Energy, Office of Science, Office of Nuclear Physics, under award DE-FG02-04ER41338. He acknowledges the essential contribution to the work reported here from his collaborators Femke Oosterhof, Jordy de Vries, Bingwei Long, and Rob Timmermans. J.W. thanks Lund University and ESS for their support of his travel and D. Milstead for figure . Currently, ESS council has approved 1.1 M€ for the neutron extraction system. Preparatory support has been secured from the European Commission and the Swedish Research Council, and construction and testing of annihilation detector prototype components, validation and simulation, and system integration at the ESS test beam line are all underway. The collaboration involves institutes from Sweden, USA, Israel, France, Italy, Brazil, Australia, with co-spokespersons G. Brooijmans (Columbia) and D. Milstead (Stockholm). The project is ready to move forward when construction funding is secured (∼15 M€ is required for the minimum configuration).
Keywords
- Baryon number violation
- effective field theory
- lattice QCD
- neutron-antineutron oscillation
- nuclear matrix elements
- proton decay