Speaker
Dr
Jinhui Chen
(SINAP)
Description
The Hyperon-Nucleon (Y-N) interactions play an important role in understanding the strong interaction.
It is suggested that alternative Y-N couplings can be a possible solution to the recent observations of neutron star exceeding two solar masses,
the so-called hyperon puzzle. A precise measurement on masses and lifetimes of hypertriton and anti-hypertriton can enrich our knowledge on Y-N interactions.
In this talk, we will present the first precise measurement of hypertriton and anti-hypertriton masses in heavy-ion collisions at STAR with the Heavy Flavor Tracker (HFT).
Hypertritons and anti-hypertritons are reconstructed through both two-body decay channel ($\mathrm{^3He + \pi^-}$) and three-body decay channel ($\mathrm{p+d+\pi^-}$) using the
high-statistics data collected in 2014 and 2016 Au+Au collisions at $\sqrt{s_{_\mathrm{NN}}}$=200 GeV. The measured masses will be used to extract the binding energies for hypertriton and anti-hypertriton.
We will also report an improved measurement of the hypertriton and anti-hypertriton lifetimes. Physics implications on the understanding of Y-N interactions via our measurements will be discussed.
Primary author
Dr
Jinhui Chen
(SINAP)
