Study of the [formula omitted] elastic scaterring from the reaction K −p→K −π−p π+ at 4.25 GeV/c incident K − momentum

• Published in: Nuclear physics. B 1973-12, Vol.67 (2), p.381-394
• Main Authors: Jongejans, B., van Meurs, R.A., Tenner, A.G., Voorthuis, H., Heinen, P.M., Metzger, W.J., Tiecke, H.G.J.M., Van de Walle, R.T.
• Format: Article
• Language: English
• ISSN: 0550-3213; 1873-1562
• DOI: 10.1016/0550-3213(73)90203-4

Results on the elastic K − π − scattering have been obtained from a study of the K − π − system in 15 000 events of the type K −p→K − π −p π + at a K − beam momentum of 4.25 GeV/ c. The on-mass-shell values of the spherical harmonic moments of the K − π − scattering angular distribution and the K − π − elastic cross section have been obtained by extrapolation to the pion pole. From these values we determined the s- and p-wave phase shifts δ 0 3 and δ 1 3 as a function of the effective mass of the K − π − system between threshold and 1.25 GeV/ c 2. The value of | δ 0 3| is smaller than 17° for all mass values and the existence of a p-wave cannot be neglected. At m K − π − = 1.18 GeV/ c 2 there are two solutions for the phase shifts. On the average, the cross section of the K − π − elastic scattering over the region of the effective mass considered amounts to approximately 2.5 mb.