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Measurement of the reaction π+ p→π+π+ n near threshold |
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| Authors: | G Kernel D Korbar P Križan M Mikuž U Seljak F Sever A Stanovnik M Starič D Zavrtanik C W E van Eijk R W Hollander W Lourens F G Michaelis N W Tanner S A Clark J V Jovanovich J D Davies J Lowe S M Playfer OMICRON Collaboration |
| Institution: | 1. J. Stefan Institute and Department of Physics, E. Kardelj University, YU-61111, Ljubljana, Yugoslavia 4. Delft University of Technology, Delft, The Netherlands 6. CERN, CH-1211, Geneva 23, Switzerland 7. Nuclear Physics Laboratory, Oxford University, OX1 3RH, Oxford, UK 8. Rutherford and Appleton Laboratory, Chilton, OX11 0QX, Didcot, UK 10. Department of Physics, University of Manitoba, R3T 2N2, Winnipeg, Manitoba, Canada 11. Department of Physics, University of Birmingham, B15 2TT, Birmingham, UK |
| Abstract: | The reaction π+ p→π+π+ n was studied in the vicinity of the reaction threshold at ten incident pion beam momenta from 297 MeV/c to 480 MeV/c. From data angular distributions, invariant mass spectra and integrated cross-sections were deduced. The chiral symmetry breaking parameter as determined by this reaction equals to ξ=1.56±0.26±0.39, where the first error is experimental, while the latter reflects the uncertainty in the ansatz used in the extrapolation to the reaction threshold. A comparison with the other reaction channels of the reaction πp→ππN indicates that a single parameter (ξ) is not sufficient to describe low energy ππ interactions. |
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