29 November 2023

YN scattering data: AH99

Authors: J.K. Ahn, B. Bassalleck, M.S. Chung, W.M. Chung, H. En'yo, T. Fukuda, H. Funahashi, Y. Goto, A. Higashi, M. Ieiri, M. Iinuma, K. Imai, Y. Itow, H. Kanda, Y.D. Kim, J.M. Lee, A. Masaike, Y. Matsuda, S. Mihara, I.S. Park, Y.M. Park, N. Saito, Y.M. Shin, K.S. Sim, R. Susukita, R. Takashima, F. Takeutchi, P. Tlustý, S. Yamashita, S. Yokkaichi, M. Yoshida
Reference: Nucl. Phys. A648 (1999), 263-279
Group: KEK - PS E251 collaboration

The experiment:

A 1.64 GeV/c π+ beam at the 12 GeV Proton Synchroton at KEK was used to produce Σ+ particles through the (π+,K+) reaction in the scintillating fiber (SCIFI) target. The tracks left by scattering Σ+ in the SCIFI target produced visual image data which were analyzed using an automatic track recognition program. After analyzing, of the remaining candidate events 11 Σ+ p scattering events were selected by eye-scanning.

The data:

Σ+ p → Σ+ p differential cross section (DSG)
based on 11 events in the range 300 - 600 MeV/c

   cos(theta)         DSG [mb]

 -0.4 - 0.1      2.2   +3.2 -1.1
  0.1 - 0.6      3.3   +2.5 -1.2


The uncertainties are the statistical uncertainties only. Overall systematic uncertainties are estimated to be about 16% of the obtained cross section 29 November 2023