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Electroproduction of the Lambda/Sigma⁰ hyperons at Q²~0.5 (GeV/c)² at forward angles

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arxiv 2403.01173 v5 pith:A6QHZETH submitted 2024-03-02 nucl-ex

Electroproduction of the Lambda/Sigma^0 hyperons at Q^2~0.5 (GeV/c)^2 at forward angles

K. Okuyama , K. Itabashi , S. Nagao , S.N. Nakamura , K.N. Suzuki , T. Gogami , B. Pandey , L. Tang
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P. Byd\v{z}ovsk\'y D. Skoupil T. Mart D. Abrams T. Akiyama D. Androic K. Aniol C. Ayerbe Gayoso J. Bane S. Barcus J. Barrow V. Bellini H. Bhatt D. Bhetuwal D. Biswas A. Camsonne J. Castellanos J-P. Chen J. Chen S. Covrig D. Chrisman R. Cruz-Torres R. Das E. Fuchey K. Gnanvo F. Garibaldi T. Gautam J. Gomez P. Gueye T.J. Hague O. Hansen W. Henry F. Hauenstein D.W. Higinbotham C.E. Hyde M. Kaneta C. Keppel T. Kutz N. Lashley-Colthirst S. Li H. Liu J. Mammei P. Markowitz R.E. McClellan F. Meddi D. Meekins R. Michaels M. Mihovilovi\v{c} A. Moyer D. Nguyen M. Nycz V. Owen C. Palatchi S. Park T. Petkovic S. Premathilake P.E. Reimer J. Reinhold S. Riordan V. Rodriguez C. Samanta S.N. Santiesteban B. Sawatzky S. \v{S}irca K. Slifer T. Su Y. Tian Y. Toyama K. Uehara G.M. Urciuoli D. Votaw J. Williamson B. Wojtsekhowski S.A. Wood B. Yale Z. Ye J. Zhang X. Zheng
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keywords lambdasigmaelectroproductionanglescrossdatadependencedifferential
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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.

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