학술논문
Electroproduction of the Lambda/Sigma^0 hyperons at Q^2~0.5 (GeV/c)^2 in forward angles
Document Type
Working Paper
Author
Okuyama, K.; Itabashi, K.; Nagao, S.; Nakamura, S. N.; Suzuki, K. N.; Gogami, T.; Pandey, B.; Tang, L.; Bydžovský, P.; Skoupil, D.; Mart, T.; 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.; 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.; Zhang, X.
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Abstract
In 2018, the E12-17-003 experiment was conducted at the Thomas Jefferson National Accelerator Facility (JLab) to explore the possible existence of an nnLambda state in the reconstructed missing mass distribution from a tritium gas target [K. N. Suzuki et al., Prog. Theor. Exp. Phys. 2022, 013D01 (2022), B. Pandey et al., Phys. Rev. C 105, L051001 (2022)]. As part of this investigation, data was also collected using a gaseous hydrogen target, not only for a precise absolute mass scale calibration but also for the study of Lambda/Sigma^0 electroproduction. This dataset was acquired at Q^2~0.5 (GeV/c)^2, W=2.14 GeV, and theta_{gamma K}^{c.m.}~8 deg. It covers forward angles where photoproduction data is scarce and a low-Q^2 region that is of interest for hypernuclear experiments. On the other hand, this kinematic region is at a slightly higher Q^2 than previous hypernuclear experiments, thus providing crucial information for understanding the Q^2 dependence of the differential cross sections for Lambda/Sigma^0 hyperon electroproduction. This paper reports on the Q^2 dependence of the differential cross section for the e + p -> e' + K^+ + Lambda/Sigma^0 reaction in the 0.2-0.8 (GeV/c)^2, and provides comparisons with the currently available theoretical models.
Comment: 11 pages, 15 figures
Comment: 11 pages, 15 figures