Investigating the hyperon-nucleon strong interaction with a precision measurement of the hypertriton lifetime in ALICE

F. Mazzaschi
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Abstract

The hypertriton is a bound state of a proton, a neutron and a Λ baryon. Studying its internal structure is crucial to investigate the hyperon–nucleon strong interaction and offers insights into the inner core of neutron stars, where Λ production is favoured. One powerful way to investigate the hypertriton’s internal structure is to measure precisely its lifetime. The hypertriton is an extremely loosely bound object with a lambda separation energy EΛ of only 130 keV. Therefore the hypertriton lifetime is expected to be close to the one of the free Λ. Thanks to the very large set of Pb–Pb collision data collected during LHC Run 2, the ALICE collaboration has performed systematic studies on the hypertriton lifetime. The hypertriton 2-body mesonic decay channel has been studied with the help of machine learning techniques for the signal extraction. The precision of the new ALICE results on the hypertriton lifetime is comparable with the current world average and the measured lifetime value confirms the weakly-bound nature of the hypertriton.
利用ALICE中超子寿命的精确测量来研究超子-核子强相互作用
超子是质子、中子和Λ重子的束缚态。研究其内部结构对于研究超子-核子强相互作用至关重要,并提供了对中子星内核的见解,其中Λ的产生是有利的。研究超海旋子内部结构的一个有效方法是精确测量它的寿命。超旋子是一种束缚极其松散的物体,其分离能EΛ仅为130 keV。因此,超氚寿命预计将接近于自由的Λ。得益于LHC Run 2期间收集的大量Pb-Pb碰撞数据,ALICE合作项目对超重子寿命进行了系统的研究。利用机器学习技术研究了超子二体中介子衰变通道的信号提取。新的ALICE结果的精度与目前的世界平均水平相当,测量的寿命值证实了超海旋子的弱束缚性质。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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