Measurement of Antiproton-Proton Forward Charge-Exchange Scattering

Creators: Atwood, W.; Barish, B.; Nicholson, H. W.; Pine, J.; Tollestrup, A. V.; Yoh, J. K.; Carroll, A. S.; Lobkowicz, F.; Nagashima, Y.

Abstract

There is a well-known forward peak in the np forward charge-exchange cross section, for momentum transfers |t|≲mπ2. We have performed an experiment to look for analogous behavior in the reaction p̅p→n̅n. The data cover the kinematical region 0≤|t|≤1.5mπ2 at an incident antiproton momentum of 1.80 GeV/c. A forward peak is observed, which is estimated (from results of other experiments) to be considerably smaller than that for np charge exchange. This result can be understood in terms of interference between one-pion exchange and exchange of a particle with even G parity.

Additional Information

©1970 The American Physical Society Received 27 July 1970 We would like to acknowledge the invaluable assistance of Hans Grau in setting up this experiment. We also want to thank Professor Steven Frautschi for helpful discussions.

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