Fig. 3 (IMAGE)
Caption
（Top）Measured reaction cross-section. The horizontal axis is the K- and proton collision recoil energy converted into a mass value. Large reaction events occur at mass values lower than the sum of the K- and proton masses, which itself suggests the existence of Λ(1405). The measured data were reproduced by scattering theory (solid lines). (Bottom) Distribution of K- and proton scattering amplitudes. When squared, these correspond to the reaction cross-section, and are generally complex numbers. The calculated values match with the measured data. When the real part (solid line) crosses 0, the value of the imaginary part reaches its maximum value. This is a typical distribution for a resonance state, and determines the complex mass. The arrows indicate the real part.
Credit
2023, Hiroyuki Noumi, Pole position of Λ(1405) measured in d(K^-,n)πΣ reactions, Physics Letters B
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License
CC BY