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Measurement of the Real Part of the Forward Amplitude in K- n and K+ n Elastic Scattering at 10-GeV/c and a New K+- n Dispersion Relation

Baillon, P. ; Declais, Y. ; Ferro-Luzzi, M. ; et al.
Nucl.Phys.B 134 (1978) 31-48, 1978.
Inspire Record 122470 DOI 10.17182/hepdata.35130

The differential cross section in the very forward direction has been measured for K − and K + scattering (break-up and coherent) on a deuterium target at an incident momentum of 10 GeV/ c . From these measurements and using a model for the scattering and re-scattering effects in deuterium, we have exploited the Coulomb-nuclear interference to deduce the real part of the K ± n scattering amplitude at a momentum transfer t = 0. The measurements are the first ever obtained for the K + n reaction and the first at this energy for the K − n reaction. A comparison has been made between our results and those predicted from dispersion relations. A new dispersion-relation fit including all the existing K ± n values at different energies has been performed.

2 data tables
Table 1

SUM OF COHERENT AND BREAK-UP SCATTERING ON DEUTERIUM.

Table 2

FROM FIT TO D(SIG)/DT OVER -T=0.0018 TO 0.074 GEV**2 ALLOWING FOR COULOMB SCATTERING, DOUBLE SCATTERING, INTERFERENCES AND FERMI MOTION. CORRELATION BETWEEN SLOPE AND RE(AMP)/IM(AMP) IS REFLECTED IN THE GIVEN SYSTEMATIC E RRORS.