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arXiv 0912.0843hep-ex
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在正电子素衰变中寻找CP破坏

Search for CP-violation in Positronium Decay

T. Yamazaki, T. Namba, S. Asai, T. Kobayashi

摘要:

在过去的十年中,夸克区的CP破坏已经得到了很好的证实,但在轻子区还没有观察到。利用(\vec{S} \cdot \vec{k_{1}})(\vec{S} \cdot \vec{k_{1}} \times \vec{k_{2}})的角关联寻找正电子偶素中的CP破坏衰变过程,其中\vec{S}是正电子偶素自旋,\vec{k_{1}},\vec{k_{2}}是正电子偶素衰变光子的方向.当灵敏度为2.2 \times 10^{-3}时,没有发现CP破坏,其强度与K介子中的CP破坏相当。CP破坏参数(C_{CP})的90%置信区间确定为-0.0023 < C_{CP} < 0.0049。这个结果比之前的实验严格7倍。

英文摘要:

CP-violation in the quark sector has been well established over the last decade, but has not been observed in the lepton sector. We search for CP-violating decay processes in positronium, using the angular correlation of (\vec{S}\cdot\vec{k_{1}})(\vec{S}\cdot\vec{k_{1}}\times\vec{k_{2}}), where \vec{S} is the the positronium spin and \vec{k_{1}}, \vec{k_{2}} are the directions of the positronium decay photons. To a sensitivity of 2.2\times10^{-3}, no CP-violation has been found, which is at the level of the CP-violation amplitude in the K meson. A 90% confidence interval of the CP-violation parameter (C_{CP}) was determined to be -0.0023 < C_{CP} < 0.0049. This result is a factor 7 more strict than that of the previous experiment.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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