arXiv 2006.150442020-06hep-phnucl-th

高多重数$pp$碰撞产生的$X(3872)$的性质

The nature of $X(3872)$ from high-multiplicity $pp$ collisions

Angelo Esposito, Elena G. Ferreiro, Alessandro Pilloni, Antonio D. Polosa, Carlos A. Salgado

备注：: 11 pages, 6 figures. Presentation updated, references added, conclusions unchanged. Version accepted in EPJC
发表信息：: Eur. Phys. J. C 81, 669 (2021)
DOI：: 10.1140/epjc/s10052-021-09425-w

摘要：

在过去的二十年里，奇异共振的结构并不完全符合通常的夸克模型的预期，这一直是一个激烈的科学争论的问题。估计这些态的大小的一个可能的方法是研究它们浸入QCD物质时的行为。最近，LHCb测量了外来$X(3872)$相对于普通$ψ(2S)$的相对丰度。我们使用comover相互作用模型来研究紧凑型$X(3872)$的产率。为了证实该模型在高多重$pp$碰撞的可靠性，我们描述了抑制激发在地面$Υ$状态。有了这个在手，我们表明，紧凑的$X(3872)$的大小将略大于$ψ(2S)$。如果$X(3872)$被假定为一个大尺寸的介子分子，我们认为它在QCD物质中的演化应该通过一个聚结模型来描述，就像氘产生的数据所建议的那样。我们表明，该模型的预测与数据的$X(3872)$。

英文摘要：

The structure of exotic resonances that do not trivially fit the usual quark model expectations has been a matter of intense scientific debate during the last two decades. A possible way of estimating the size of these states is to study their behavior when immersed in QCD matter. Recently, LHCb has measured the relative abundance of the exotic $X(3872)$ over the ordinary $ψ(2S)$. We use the comover interaction model to study the yield of a compact $X(3872)$. To confirm the reliability of the model in high-multiplicity $pp$ collisions, we describe the suppression of excited over ground $Υ$ states. With this at hand, we show that the size of the compact $X(3872)$ would be slightly larger than that of the $ψ(2S)$. If the $X(3872)$ is instead assumed to be a meson molecule of large size, we argue that its evolution in QCD matter should be described via a coalescence model, as suggested by data on deuteron production. We show that the predictions of this model for the $X(3872)$ are in contrast with data.

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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