长寿命 π⁺π⁻ 原子寿命的首次测量
高能物理 - 实验
2019-03-06 v1 核实验
摘要
CERN PS 加速器上改进后的 DIRAC 实验首次观测到由质子轰击铍靶产生的长寿命类氢 π⁺π⁻ 原子。其中一部分原子穿越了 96 mm 的间隙，并在 2.1 μm 厚的铂箔中破裂。通过分析观测到的原子对数量 ，发现 2 态的寿命为 s，与相应的 QED 2 态寿命 s 不矛盾。该寿命值比我们此前测量的 π⁺π⁻ 原子基态寿命 s 大三个数量级。对长寿命 π⁺π⁻ 原子的进一步研究将允许测量 与 原子态之间的能量差，从而确定 ππ 散射长度，以检验 QCD 预言。
引用
@article{arxiv.1811.08659,
title = {First measurement of a long-lived $\pi^+ \pi^-$ atom lifetime},
author = {B. Adeva and L. Afanasyev and A. Anania and S. Aogaki and A. Benelli and V. Brekhovskikh and T. Cechak and M. Chiba and P. V. Chliapnikov and P. Doskarova and D. Drijard and A. Dudarev and D. Dumitriu and D. Fluerasu and A. Gorin and O. Gorchakov and K. Gritsay and C. Guaraldo and M. Gugiu and M. Hansroul and Z. Hons and S. Horikawa and Y. Iwashita and V. Karpukhin and J. Kluson and M. Kobayashi and V. Kruglov and L. Kruglova and A. Kulikov and E. Kulish and A. Lamberto and A. Lanaro and R. Lednicky and C. Mariñas and J. Martincik and L. Nemenov and M. Nikitin and K. Okada and V. Olchevskii and V. Ovsiannikov and M. Pentia and A. Penzo and M. Plo and P. Prusa and G. F. Rappazzo and A. Romero Vidal and A. Ryazantsev and V. Rykalin and J. Saborido and J. Schacher and A. Sidorov and J. Smolik and F. Takeutchi and T. Trojek and S. Trusov and T. Vrba and V. Yazkov and Y. Yoshimura and P. Zrelov},
journal= {arXiv preprint arXiv:1811.08659},
year = {2019}
}
备注
7 pages, 8 figures