Near threshold angular distributions for the H-2(gamma,I >)X reaction

作者：Beckford, B.^*; Bydzovsky, P.; Chiba, A.; Doi, D.; Fujii, T.; Fujii, Y.; Futatsukawa, K.; Gogami, T.; Hashimoto, O.; Han, Y. C.; Hirose, K.; Honda, R.; Hosomi, K.; Ishikawa, T.; Kanda, H.; Kaneta, M.; Kaneko, Y.; Kato, S.; Kawama, D.; Kimura, C.; Kiyokawa, S.; Koike, T.; Maeda, K.; Makabe, K.; Matsubara, M.; Miwa, K.; Nagao, S.; Nakamura, S. N.; Okuyama, A.; Shirotori, K.; Sugihara, K.; Suzuki, K.; Tamae, T.; Tamura, H.; Tsukada, K.; Yamamoto, F.; Yamamoto, T. O.; Yonemoto, F.

来源：Progress of Theoretical and Experimental Physics, 2016, 2016(6): 063D01.

DOI：10.1093/ptep/ptw071

• NEUTRAL-KAON PHOTOPRODUCTION
• ELECTROMAGNETIC PRODUCTION
• PHOTON ENERGIES
• GAMMA-P
• LAMBDA
• SIGMA(0)

A study of the H-2(gamma, Lambda) X reaction was performed using a tagged photon beam at the Research Center for Electron Photon Science ( ELPH), Tohoku University. The photoproduced Lambda was measured in the p pi(-) decay channel by the upgraded Neutral Kaon Spectrometer ( NKS2+). The momentum integrated differential cross section was determined as a function of the scattering angle of Lambda in the laboratory frame for five energy bins. Our results indicated a peak in the cross section at angles smaller than cos(Lambda)(LAB) = 0.96. The experimentally obtained angular distributions were compared to isobar models, Kaon- Maid ( KM) and Saclay- Lyon A ( SLA), in addition to the composite Regge- plus- resonance ( RPR) model. Both SLA( rK1K. =- 1.4) and RPR describe the data quite well in contrast to the KM model, which substantially under- predicted the cross section at the most forward angles. With the anticipated finalized data on Lambda integrated and momentum dependent differential cross sections of H-2(gamma, Lambda) X [ M. Kaneta et al., Nucl. Phys. A 914, 69 ( 2013)], we present our findings on the angular distributions.

• 出版日期2016-6
• 单位兰州大学; RIKEN