Neutron-antineutron oscillations: Theoretical status and experimental prospects

D G Phillips,W M Snow,K S Babu,S Banerjee,David V Baxter,Zurab Berezhiani,M Bergevin,S Bhattacharya,G Brooijmans,L Castellanos,Mc Chen,C E Coppola,R Cowsik, J A Crabtree,P Das,E B Dees,A D Dolgov,P D Ferguson,M Frost, T A Gabriel,Avraham Gal,Franz X Gallmeier, K Ganezer, E Golubeva,Geoffrey L Greene,B L Hartfiel,Ayman I Hawari,L Heilbronn, C D Johnson,Y Kamyshkov, B Kerbikov,Masaaki Kitaguchi,B Z Kopeliovich,V B Kopeliovich,V A Kuzmin,Cy Liu,P L Mcgaughey,M Mocko,Rabindra N Mohapatra, N Mokhov,G Muhrer,H P Mumm,L B Okun,R W Pattie,Chris Quigg,E Ramberg,A K Ray, Ajit K Roy,A Ruggles,U Sarkar,A Saunders,A P Serebrov,Hirohiko M Shimizu,Robert E Shrock,A K Sikdar,S K L Sjue, S I Striganov,Lawrence W Townsend,R Tschirhart,A I Vainshtein,R Van Kooten,Zheng Wang,A R Young

Physics Reports（2016）

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摘要

The observation of neutrons turning into antineutrons would constitute a discovery of fundamental importance for particle physics and cosmology. Observing the n–n̄ transition would show that baryon number (B) is violated by two units and that matter containing neutrons is unstable. It would provide a clue to how the matter in our universe might have evolved from the B=0 early universe. If seen at rates observable in foreseeable next-generation experiments, it might well help us understand the observed baryon asymmetry of the universe. A demonstration of the violation of B–L by 2 units would have a profound impact on our understanding of phenomena beyond the Standard Model of particle physics.

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关键词

Neutron–antineutron oscillation,Baryon number violation,Spallation,Cold neutron source,Quasi-free condition

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