衰变 K⁺ → π⁺γγ 的观测
高能物理 - 实验
2008-11-26 v2
摘要
报告首次观察到衰变 K⁺ → π⁺γγ。观察到 31 个事件，在 π⁺动量范围 100 MeV/c 至 180 MeV/c 内，背景估计为 5.1 ± 3.3 个。对应的部分分支比率 B(K⁺ → π⁺γγ, 100 MeV/c < P_π⁺ < 180 MeV/c) 为 (6.0 ± 1.5（统计）± 0.7（系统）) × 10⁻⁷。在 π⁺动量大于 215 MeV/c 的区域未观察到 K⁺ → π⁺γγ 衰变。观察到的 π⁺动量谱与奇异扰动理论的预测进行了比较。
引用
@article{arxiv.hep-ex/9708011,
title = {Observation of the Decay K^+ --> pi^+ gamma gamma},
author = {E787 Collaboration and P. Kitching and T. Nakano and M. Rozon and R. Soluk and S. Adler and M. S. Atiya and I-H. Chiang and J. S. Frank and J. S. Haggerty and T. F. Kycia and K. K. Li and L. S. Littenberg and A. Sambamurti and A. Stevens and R. C. Strand and C. Witzig and W. C. Louis and D. S. Akerib and M. Ardebili and M. Convery and M. M. Ito and D. R. Marlow and R. A. McPherson and P. D. Meyers and M. A. Selen and F. C. Shoemaker and A. J. S. Smith and E. W. Blackmore and D. A. Bryman and L. Felawka and A. Konaka and Y. Kuno and J. A. Macdonald and T. Numao and P. Padley and J. -M. Poutissou and R. Poutissou and J. Roy and A. S. Turcot},
journal= {arXiv preprint arXiv:hep-ex/9708011},
year = {2008}
}
备注
9 pages, LaTeX, 3 Postscript figures