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.

引用

页码：972 / 975

页数：4

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