在COMPASS生产的外来谐音

A. Guskov
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引用次数: 3

摘要

在过去的15年里,各种各样的实验都以外来的类恰莫尼亚态为目标,但它们的性质仍然未知。光(墨)法是一种很有前途的研究它们的新手段。欧洲核子研究中心(CERN)的固定目标实验COMPASS分析了2002年至2011年间用μ介子束收集的全套数据,涵盖了(虚拟)光子-核子系统质心能量从7 GeV到19 GeV的范围。在反应$\mu^+~N \rightarrow \mu^+(J/\psi\pi^+\pi^- )\pi^{\pm} N'$中观察到X(3872)态的产生,其统计显著性约为5 $\sigma$。来自衰变$X(3872)\rightarrow J/\psi\pi^+\pi^-$的$\pi^+\pi^-$质量分布的形状与先前的观测结果不一致。估计$X(3872)$衰变成$J/\psi\pi\pi$的截面与分支分数的乘积为71 $\pm$ 28(stat) $\pm$ 39(syst) pb。本文还报道了为生产$Z_c^{\pm}(3900)$所获得的结果以及对未来的展望。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Muoproduction of exotic charmonia at COMPASS
Exotic charmonium-like states have been targeted by various experiments in the last 15 years, but their nature still is unknown. Photo-(muo)production is a new promising instrument to study them. COMPASS, a fixed target experiment at CERN, analyzed the full set of the data collected with a muon beam between 2002 and 2011, covering the range from 7 GeV to 19 GeV in the centre-of-mass energy of the (virtual)photon-nucleon system. Production of the X(3872) state in the reaction $\mu^+~N \rightarrow \mu^+(J/\psi\pi^+\pi^- )\pi^{\pm} N'$ has been observed with a statistical significance of around 5 $\sigma$. The shape of the $\pi^+\pi^-$ mass distribution from the decay $X(3872)\rightarrow J/\psi\pi^+\pi^-$ shows disagreement with previous observations. The product of the cross section and the branching fraction of the $X(3872)$ decay into $J/\psi\pi\pi$ is estimated as 71$\pm$28(stat)$\pm$39(syst) pb. The results obtained for the production of the $Z_c^{\pm}(3900)$ are also reported as well as future perspectives.
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