[EX] (Part Ⅱ) Femtoscopic approach to hadron-hadron interactions


2021/7/01 16:00〜18:00




大西 明 教授







Hadron-hadron interactions are the basic inputs to discuss hadronic
molecules and hadronic nuclei. Flavored hadron interactions, however, are
generally difficult to access in standard scattering experiments. Recent
research activities on hadron-hadron correlation functions open the ways to
systematically access flavored hadron interactions such as $\Omega N$, $\Xi
N$, $K^- N$ and even $DN (\bar{D}N$. Since the correlation function is
given as the average of the wave function squared with the normalized
source function weight (Koonin-Pratt formula), it contains the information
of the hadron-hadron interaction. Thus, provided that the source function
is known, one can examine the hadron-hadron interaction.
In this seminar, after a short introduction, I first explain how we can
calculate the correlation function in simple two cases; (1) quantum
statistics operates but there is no pairwise interaction
(Hanbury-Brown–Twiss effects), and (2) non-identical particle pairs with a
short-range interaction in an analytic model (Lednicky-Lyuboshits model).
Next I explain some other effects such as the Coulomb potential and
coupled-channel effects. In the third part, I show some of the recent
correlation function data reported by the RHIC-STAR and LHC-ALICE
collaborations. These data give constraints on the low-energy scattering
parameters, and seem to suggest the existence of bound states in some of
the hadron-hadron pairs. In the last part, I will give an outlook.

This time, the EX seminar contains two talks. The first talk (Part I) is given by
Prof. Takumi Doi, and then the second talk (Part II) is given by Prof. Akira Ohnishi.
Since both talks are related to each other, we recommend you to listen to both talks,
if possible.