Measurement of Lambda(0)-(Lambda(0))over-bar mass difference

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作者：
Rybicki, K
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来源：
ACTA PHYSICA POLONICA B | 1996年 / 27卷 / 09期
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O4 [物理学];
学科分类号：
0702 ;
摘要：
We measure the masses of of Lambda(0) and <(Lambda(0))over bar> hyperons using a very clean sample of 30844 hyperons produced in 230 GeV/c pi(-)-Cu interactions and decaying in a silicon vertex detector. Systematic errors were estimated by using K-s(0) decays registered in the same vertex detector. For the average Lambda(0)/<(Lambda(0))over bar> mass we obtain (1115.766 +/- 0.006 +/- 0.042) MeV/c(2). The mass difference M(Lambda) - M(<(Lambda)over bar>) = (0.015 +/- 0.013) MeV/c(2) averaged with the E766 result of (-0.012 +/- 0.010) MeV/c(2) yields (-0.002 +/- 0.008) MeV/c(2). This confirms the CPT invariance within the accuracy of 7 x 10(-6).
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页码：2155 / 2158
页数：4
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