2025/03/22 by Jung, Woo Seung, Ichikawa, Yudai, Kang, Byung Min +30
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Nuclear Experiment (nucl-ex)
paper · doi:10.48550/arxiv.2503.17614
We present a measurement of the production of Ξ- and ΛΛ in the 12C(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 12C(K-, K+Ξ-) reaction, compared to the inclusive 12C(K-, K+) reaction cross section, indicates that the Ξ- escaping probability peaks at 70% in the energy region of EΞ=100 to 150 MeV above the Ξ- emission threshold. A classical approach using eikonal approximation shows that the total cross sections for Ξ- inelastic scattering ranges between 42 mb and 23 mb in the Ξ- momentum range from 0.4 to 0.6 GeV/c. Furthermore, based on the relative cross section for the 12C(K-, K+ΛΛ) reaction, the total cross section for Ξ-p→ΛΛ is estimated in the same approach to vary between 2.2 mb and 1.0 mb in the momentum range of 0.40 to 0.65 GeV/c. Specifically, a cross section of 1.0 mb in the momentum range of 0.5 to 0.6 GeV/c imposes a constraint on the upper bound of the decay width of the Ξ- particle in infinite nuclear matter, revealing ΓΞ< ∼ 0.6 MeV.