{"title":"Search for narrow lines in gamma spectra from p̄p annihilation at rest","authors":"S. Playfer","doi":"10.1063/1.36115","DOIUrl":null,"url":null,"abstract":"The gamma ray spectrum from pp annihilation at rest has been measured with good energy resolution and high statistics using a magnetic pair spectrometer. We find no narrow lines with widths comparable to the resolution. We obtain upper limits (90% C.L.) on the yield of narrow baryonium states of 2–5×10−4/p for states below 1700 MeV, and 5–10×10−4/p for states between 1700 and 1800 MeV.","PeriodicalId":316054,"journal":{"name":"Intersections between particle and nuclear physics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2008-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Intersections between particle and nuclear physics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1063/1.36115","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
The gamma ray spectrum from pp annihilation at rest has been measured with good energy resolution and high statistics using a magnetic pair spectrometer. We find no narrow lines with widths comparable to the resolution. We obtain upper limits (90% C.L.) on the yield of narrow baryonium states of 2–5×10−4/p for states below 1700 MeV, and 5–10×10−4/p for states between 1700 and 1800 MeV.
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