Speaker
Dr
Hidemitsu Asano
(RIKEN)
Description
The structure of the $\Lambda$(1405) is an important and long-standing issue
to understand the $\bar{K}$-nucleus interaction.
The J-PARC E31 experiment has been performed to investigate the $\Lambda$(1405)
spectrum shape.
Because it is hard to form the $\Lambda$(1405) directly by a $\bar{K} N$
scattering in free space, E31 uses the d(K$^-$,n) reaction
with an incident kaon momentum of 1 GeV/c. We will identify three
final states - $\Sigma^-\pi^+$,$\Sigma^+\pi^-$,$\Sigma^0\pi^0$ -
so that the isospin structure of hyperon resonance states produced
can be decomposed.
The first physics run of the E31 experiment was performed in 2016. To
enhance the statistics of the data set, we have performed
the second physics run in the beginning of 2018. During the second run
of E31, around $3.9 \times 10^{10}$ kaons impacted on the deuteron
target.
In this presentation, we will report the current status of analysis
and latest results from E31 data.
Primary author
Dr
Hidemitsu Asano
(RIKEN)
