Measurement of the yield of spectator protons at zero emission angle in deuteron stripping in carbon at 8.9 GeV/c

The invariant cross section for stripping of the deuteron in a carbon target has been measured at a deuteron momentum of 8.9 GeV/c. The cross section for zero-angle emission of the stripping proton has been found to be (E/p2)(d2sigma/dpdΩ)(theta = 0, p = (1/2) p/sub d/) = 281 +- 9 bx c3/GeV2x sr, in agreement with the value calculated from the Bertocci-Treleani model for deuteron fragmentation. The cross section calculated by the same method, but with the Nissen-Meyer orthogonalization method used for the wave functions of the initial deuteron and the np system produced in its breakup, is 1.4 times the measured cross section