R. L. Dixon

Atomic mass dependence ofΞ−andΞ¯+production in central 250 GeVπ−-nucleon interactions

We present the first measurement of the atomic mass dependence of central Ξ− and Ξ + production. It is measured using a sample of 22,459 Ξ−’s and Ξ + ’s produced in collisions between a 250 GeV π− beam and targets of beryllium, aluminum, copper, and tungsten. The relative cross sections are fit to theWe present the first measurement of the atomic mass dependence of central \Xi^- and \overline{\Xi}^+ production. It is measured using a sample of 22,459 \Xi^-s and \overline{\Xi}^+s produced in collisions between a 250 GeV \pi^- beam and targets of beryllium, aluminum, copper, and tungsten. The relative cross sections are fit to the two parameter function \sigma_0 A^\alpha, where A is the atomic mass. We measure \alpha = 0.924+-0.020+-0.025, for Feynman-x in the range -0.09