No abstract

The Rapid Communications section is intended for the accelerated publication ofimportant new results. Since manuscripts submitted to this section are given priority treatment both in the editorial office and in productiona, uthors should explain in their sub mittal letter why the work justt'ftes this special handling A. Rapid Communication in Physical Review D should be no longer than jtve printed pages and must be accompanied by an abstract.

No abstract

The charged-particle fractional momentum distribution within jets, D(z), has been measured in dijet events from 1.8-TeV pp collisions in the Collider Detector at Fermilab. As expected from scale breaking in quantum chromodynamics, the fragmentation function D(z) falls more steeply as dijet invariant mass increases from 60 to 200 GeV/c 2 . The average fraction of the jet momentum carried by charged particles is 0.65 ± 0.02(stat) ± 0.08(syst).

No abstract