Cross-section measurement of virtual photoproduction of iso-triplet three-body hypernucleus, Λnn

Gogami T., Suzuki K. N.,Pandey B., Itabashi K.,Nagao S.,Okuyama K.,Nakamura S. N.,Tang L.,Abrams D.,Akiyama T.,Androic D.,Aniol K.,Ayerbe Gayoso C.,Bane J.,Barcus S.,Barrow J.,Bellini V., Bhatt H.,Bhetuwal D.,Biswas D.,Camsonne A.,Castellanos J.,Chen J-P., Chen J.,Covrig S.,Chrisman D.,Cruz-Torres R., Das R.,Fuchey E.,Gnanvo K.,Garibaldi F.,Gautam T.,Gomez J.,Gueye P.,Hague T. J.,Hansen O.,Henry W.,Hauenstein F.,Higinbotham D. W.,Hyde C. E.,Kaneta M.,Keppel C.,Kutz T.,Lashley-Colthirst N.,Li S.,Liu H.,Mammei J.,Markowitz P.,McClellan R. E.,Meddi F.,Meekins D.,Michaels R.,Mihovilovic M.,Moyer A.,Nguyen D.,Nycz M.,Owen V.,Palatchi C.,Park S.,Petkovic T.,Premathilake S.,Reimer P. E.,Reinhold J.,Riordan S.,Rodriguez V.,Samanta C.,Santiesteban S. N.,Sawatzky B.,Širca S.,Slifer K.,Su T.,Tian Y.,Toyama Y.,Uehara K.,Urciuoli G. M.,Votaw D.,Williamson J.,Wojtsekhowski B.,Wood S. A.,Yale B.,Ye Z.,Zhang J.,Zheng X.

EPJ Web of Conferences（2022）

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摘要

Missing-mass spectroscopy with the 3H(e, e′K+) reaction was carried out at Jefferson Lab’s (JLab) Hall A in Oct–Nov, 2018. The differential cross section for the 3H(γ∗, K+)Λnn was deduced at ω = Ee − Ee′ = 2.102 GeV and at the forward K+-scattering angle (0° ≤ θγ∗K ≤ 5°) in the laboratory frame. Given typical predicted energies and decay widths, which are (BΛ, Γ) = (−0.25, 0.8) and (−0.55, 4.7) MeV, the cross sections were found to be 11.2 ± 4.8(stat.)+4.1−2.1(sys.) and 18.1 ± 6.8(stat.)+4.2−2.9(sys.) nb/sr, respectively. The obtained result would impose a constraint for interaction models particularly between Λ and neutron by comparing to theoretical calculations.

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