期刊
PHYSICAL REVIEW D
卷 101, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.101.075002
关键词
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资金
- National Science Foundation [NSF 1912719, NSF PHY-1748958, PHY-1607611]
- National Science Foundation under the CAREER Grant [PHY-1915852]
- U.S. Department of Energy [DE-AC02-05CH11231]
Ultraviolet completions for axionlike particles (ALPs) lighter than the neutral pion generically induce ALP-neutral pion mixing and are therefore sensitive to direct constraints on the mixing angle. For ALPs below the pion mass, we demonstrate that strong and novel bounds on the ALP-pion mixing angle can be extracted from existing rare pion decay data, measured by the PIENU and PIBETA experiments.
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