The cross-section measurement for the 3H(e, e′K+)nnΛ reaction. (6th December 2021)

• Record Type: Journal Article
• Authors: Suzuki, K N; Gogami, T; Pandey, B; Itabashi, K; Nagao, S; Okuyama, K; Nakamura, S N; Tang, L; Abrams, D; Akiyama, T; Androic, D; Aniol, K; Gayoso, C Ayerbe; 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; Mihovilovič, 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;
• Is Part Of: Progress of theoretical and experimental physics. Volume 2022:Number 1(2022)
• Publication Date: 2021-12-06
• Subjects: Physics -- Periodicals; Mathematical physics -- Periodicals; 530.05
• DOI: 10.1093/ptep/ptab158
• Languages: English
• ISSNs: 2050-3911

Abstract

Abstract: The small binding energy of the hypertriton leads to predictions of the non-existence of bound hypernuclei for isotriplet three-body systems such as nn Λ. However, invariant mass spectroscopy at GSI has reported events that may be interpreted as the bound nn Λ state. The nn Λ state was sought by missing-mass spectroscopy via the ( e, e ′ K + ) reaction at Jefferson Lab's experimental Hall A. The present experiment has higher sensitivity to the nn Λ-state investigation in terms of better precision by a factor of about three. The analysis shown in this article focuses on the derivation of the reaction cross-section for the 3 H(γ*, K + )X reaction. Events that were detected in an acceptance, where a Monte Carlo simulation could reproduce the data well ($|\delta p/p| \lt 4\%$ ), were analyzed to minimize the systematic uncertainty. No significant structures were observed with the acceptance cuts, and the upper limits of the production cross-section of the nn Λ state were obtained to be 21 and $31 \, \rm {nb} \, \rm {sr}^{-1}$ at the $90\%$ confidence level when theoretical predictions of (− B Λ, Γ) = (0.25, 0.8) MeV and (0.55, 4.7) MeV, respectively, were assumed. The cross-section result provides valuable information for examining the existence of nn Λ.