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Spectroscopic study of the Λ(1405) resonance via the d(K-,n) reaction at J-PARC

Not scheduled
15m
2nd Floor

2nd Floor

Renaissance Portsmouth-Norfolk Waterfront Hotel 425 Water Street Portsmouth, VA 23704
Abstract Submission

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.

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