SEARCH FOR LONG-LIVED NEUTRAL RESONANCES IN BHABHA SCATTERING AROUND 1.8MEV/C2

被引：32
|
作者：
JUDGE, SM [1 ]
KRUSCHE, B [1 ]
SCHRECKENBACH, K [1 ]
TSERTOS, H [1 ]
KIENLE, P [1 ]
机构：
[1] GESELL SCHWERIONENFORSCH GMBH,W-6100 DARMSTADT,GERMANY
来源：
PHYSICAL REVIEW LETTERS | 1990年 / 65卷 / 08期
关键词：
D O I：
10.1103/PhysRevLett.65.972
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A search has been carried out for long-lived neutral particles which could be created in resonant e+e- scattering, with an invariant mass around 1.8 MeV/c2. A monoenergetic positron beam was scattered from a thin Be foil, and an active-shadow technique was used to suppress elastic e+e- scattering. No evidence was found for neutral particles decaying dominantly into e+e- pairs, in the lifetime region between 4.5×10-13 and 7.5×10-12 s (95% C.L.). This result, together with our previous work, eliminates recent theoretical models that have introduced new neutral particles in this mass region. © 1990 The American Physical Society.
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页码：972 / 975
页数：4
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