Cross Section Measurements for 12C(K-, K+Ξ-) and 12C(K-, K+Λ Λ) Reactions at 1.8 GeV/c

초록

We present a measurement of the production of Xi(-) and Lambda Lambda in the C-12(K-, K+) reaction at an incident beam momentum of 1.8 GeV /c , based on high-statistics data from J-PARC E42. The cross section for the C-12(K-, K+ Xi(-)) reaction, compared to the inclusive C-12(K-, K+) reaction cross section, indicates that the Xi(- )emission probability peaks at 70% in the energy region of E-Xi = 100-150 MeV above the Xi(- )emission threshold. A classical approach using eikonal approximation shows that the total cross section for Xi(- )inelastic scattering ranges between 42 mb and 23 mb in the Xi(- )momentum range from 0.4 to 0.6 GeV/c . Furthermore, based on the relative cross section for the C-12(K-, K+Lambda Lambda) reaction, the total cross section for Xi(-)p -> Lambda Lambda is estimated in the same approach to vary between 2.2 mb and 1.0 mb in the momentum range of 0.40-0.65 GeV/c . Specifically, a cross section of 1.0 mb in the momentum range of 0.5-0.6 GeV /c imposes a constraint on the upper bound of the decay width of the Xi(- )particle in infinite nuclear matter, revealing Gamma(Xi )< similar to 0.6 MeV.

키워드