We present a measurement of the atomic mass dependence of central and production. It is measured using a sample of 22 459 ’s and ’s produced in collisions between a 250 GeV beam and targets of beryllium, aluminum, copper, and tungsten. The relative cross sections are fit to the two parameter function , where is the atomic mass. We measure , for Feynman in the range .
- Received 26 March 1997
- Published in the issue dated 1 November 1997
© 1997 The American Physical Society