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Antiproton-Proton Annihilation into Charged Pion and Kaon Pairs from 0.7 to 2.4 GeV/c

Nicholson, H. and Barish, B. C. and Pine, J. and Tollestrup, A. V. and Yoh, J. K. and Delorme, C. and Lobkowicz, F. and Melissinos, A. C. and Nagashima, Y. and Carroll, A. S. and Phillips, R. H. (1973) Antiproton-Proton Annihilation into Charged Pion and Kaon Pairs from 0.7 to 2.4 GeV/c. Physical Review D, 7 (9). pp. 2572-2590. ISSN 0556-2821. http://resolver.caltech.edu/CaltechAUTHORS:NICprd73

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Abstract

A counter-spark-chamber experiment has been performed to measure the annihilation reactions p̅ p π+ π and p̅ p K+ K in the energy region 0.7-2.4 GeV/c. The angular region covered in the experiment was 0.65≤cosθc.m.≤1.0. The data were taken in order to study heavy bosons (mass greater than two nucleons) that might couple to the p̅ p system. Our data have been combined with data from a previous BNL-Caltech experiment to give complete folded angular distributions and total cross sections for these reactions at 12 incident momenta. The folded two-pion annihilation data have been fitted by a simple Breit-Wigner resonance model in order to explore possible resonance behavior. The extreme-angle data have been interpreted in terms of particle exchanges, and through crossing symmetry comparisons are made with backward π p and K p scattering.


Item Type:Article
Additional Information:©1973 The American Physical Society. Received 1 June 1972. We are indebted to many people for their contributions, assistance, and encouragement during the course of this experiment. In particular, we thank the members of the AGS operating and planning staff, of the Brookhaven Central Scientific Computing Facility, of the Cryogenics Group, and of the Instrumentation Division. We also thank Dr. J. Fischer for designing and constructing the spark chambers; W. Friedler, H. Grau, J. Gatz, and J. Sanders for technical assistance; Dr. C.C. Shih, of Brookhaven National Laboratory, and Dr. S. Tewksbury, formerly at the University of Rochester, for helpful discussions and suggestions regarding the application of crossing relations; and Dr. R.L. Cool for advice and support in this work. One of us (H.N.) would also like to thank members of the Research Computing Center at the University of Massachusetts for assistance and financial support.
Record Number:CaltechAUTHORS:NICprd73
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:NICprd73
Alternative URL:http://dx.doi.org/10.1103/PhysRevD.7.2572
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10980
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:21 Jun 2008
Last Modified:26 Dec 2012 10:07

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