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Measurement of radiative decay of $$Lambda$$(1405) by using hyperon spectrometer at J-PARC

Hwang, S.; Imai, Kenichi

The electromagnetic transitions rates of excited baryons to their ground baryon state are a clean probe to see the structure of the baryons. However the radiative decay has a very small branching ratio, which is of the order of 1%. While the radiative decay of the $$Sigma$$(1385) and the $$Lambda$$(1520) were reported, there are no direct measurements of the radiative decay of the $$Lambda$$(1405). Recent theoretical calculation showed that the KN compositeness of the $$Lambda$$(1405) relates with the radiative decay width of v(1405)$$rightarrow$$ $$Lambda gamma$$. The Hyperon-Time- Projection (HypTPC) is being built at the J-PARC hadron experimental facility to explore an existence of the H-dibaryon and the 3-body hadronic nucleon resonances. The HypTPC is suitable to measure the radiative decay of the $$Lambda$$(1405) due to the large acceptance and high resolution. Additionally, we are developing a $$gamma$$-array counter for improving the detection of the radiative decay. In this presentation, we will discuss the detector R&D and the expected results of a new experiment to measure the radiative decay of the $$Lambda$$(1405) with the HypTPC at J-PARC.

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