介子原子研究计划在DAΦNE:从悉达多到悉达多-2

A. Scordo, A. Amirkhani, M. Bazzi, G. Bellotti, C. Berucci, D. Bosnar, A. Bragadireanu, M. Cargnelli, C. Curceanu, A. Butt, R. D. Grande, L. Fabbietti, C. Fiorini, F. Ghio, C. Guaraldo, R. Hayano, M. Iliescu, M. Iwasaki, P. Sandri, J. Marton, M. Miliucci, P. Moskal, D. Pietreanu, K. Piscicchia, H. Shi, M. Silarski, D. Sirghi, F. Sirghi, M. Skurzok, A. Spallone, H. Tatsuno, O. Doce, E. Widmann, J. Zmeskal
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引用次数: 3

摘要

反介子与核子和原子核在低能区的相互作用是强子物理学中一个活跃的研究领域,但仍有许多重要的问题有待解决。对光介子原子(其中一个电子被带负电的介子取代)的研究是提供这种相互作用精确信息的独特工具;原子x射线光谱可以高精度地测定由质子-核强子相互作用引起的低洼态的能量转移和展宽,该实验方法为理解低能质子-核相互作用的产生阈值提供了独特的信息。最轻的原子系统,如kaonic氢和kaonic氘,以一种与模型无关的方式,传递与同位旋相关的kaon-nucleon散射长度。2009年,在LNF-INFN的DAΦNE正电子对撞机上,SIDDHARTA合作进行了迄今为止最精确的kaonic氢测量,以及对kaonic氘的探索性测量,将对撞机提供的优质kaon光束与新的实验技术相结合,如快速和非常精确的x射线探测器,如硅漂移探测器。SIDDHARTA的结果引发了新的理论工作,在理解反介子-核子散射长度反映的与奇异度的低能强相互作用方面取得了重大进展,反介子-核子散射长度由SIDDHARTA数据约束的反介子-质子振幅计算而得。最重要的开放问题是实验确定强子能移和kaonic氘的宽度;目前,为了实现这一目标,一个主要的升级装置,SIDDHARTA-2,正在实现。本文介绍了2009年取得的成果和提出的SIDDHARTA-2升级方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The kaonic atoms research program at DAΦNE: from SIDDHARTA to SIDDHARTA-2
The interaction of antikaons with nucleons and nuclei in the low-energy regime represents an active research field in hadron physics with still many important open questions. The investigation of light kaonic atoms, in which one electron is replaced by a negatively charged kaon, is a unique tool to provide precise information on this interaction; the energy shift and the broadening of the low-lying states of such atoms, induced by the kaon-nucleus hadronic interaction, can be determined with high precision from the atomic X-ray spectroscopy, and this experimental method provides unique information to understand the low energy kaon-nucleus interaction at the production threshold. The lightest atomic systems, like the kaonic hydrogen and the kaonic deuterium deliver, in a model-independent way, the isospin-dependent kaon-nucleon scattering lengths. The most precise kaonic hydrogen measurement to-date, together with an exploratory measurement of kaonic deuterium, were carried out in 2009 by the SIDDHARTA collaboration at the DAΦNE electron-positron collider of LNF-INFN, combining the excellent quality kaon beam delivered by the collider with new experimental techniques, as fast and very precise X-ray detectors, like the Silicon Drift Detectors. The SIDDHARTA results triggered new theoretical work, which achieved major progress in the understanding of the low-energy strong interaction with strangeness reflected by the antikaon-nucleon scattering lengths calculated with the antikaon-proton amplitudes constrained by the SIDDHARTA data. The most important open question is the experimental determination of the hadronic energy shift and width of kaonic deuterium; presently, a major upgrade of the setup, SIDDHARTA-2, is being realized to reach this goal. In this paper, the results obtained in 2009 and the proposed SIDDHARTA-2 upgrades are presented.
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