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Coherent single pion production by antineutrino charged current interactions and test of PCAC |
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| Authors: | P Marage M Aderholz P Allport N Armenise J P Baton M Berggren D Bertrand V Brisson F W Bullock W Burkot M Calicchio E F Clayton T Coghen A M Cooper-Sarkar O Erriquez P J Fitch G Gerbier J Guy F Hamisi P O Hulth G T Jones P Kasper H Klein R P Middleton D B Miller M M Mobayyen D R O Morrison S Natali M Neveu S W O'Neale M A Parker P Petiau J Sacton R A Sansum E Simopoulou C Vallée K Varvell A Vayaki W Venus H Wachsmuth J Wells W Wittek BEBC WA Collaboration |
| Institution: | 1. Inter-University Institute for High Energies, ULB-VUB, B-1050, Brussels, Belgium 2. Max-Planck-Institut für Physik und Astrophysik, D-8000, München, Federal Republic of Germany 3. Department of Nuclear Physics, OX1 3RH, Oxford, UK 4. Dipartimento di Fisica dell'Università e Sezione INFN, I-70126, Bari, Italy 5. DPhPE, Centre d'Etudes Nucléaires, Saclay, F-91191, Gif-sur-Yvette, France 6. Institute of Physics, University of Stockholm, S-11346, Stockholm, Sweden 7. Ecole Polytechnique, LPNHE, F-91128, Palaiseau, France 8. Department of Physics and Astronomy, University College, WC1E 6BT, London, UK 9. Institute of Nuclear Physics, PL-30055, Cracow, Poland 10. Imperial College of Science and Technology, SW7 2AZ, London, UK 11. Rutherford Appleton Laboratory, Chilton, OX1 10QX, Didcot, UK 12. University of Birmingham, B 15 2TT, Birmingham, UK 13. CERN, CH-1211, Geneva 23, Switzerland 14. Nuclear Research Centre Demokritos, G-Athens, Greece |
| Abstract: | The cross section for coherent production of a single π? meson in charged current antineutrino interactions on neon nuclei has been measured in BEBC to be (175±25) 10?40 cm2/neon nucleus, averaged over the energy spectrum of the antineutrino wide band beam at the CERN SPS; this corresponds to (0.9±0.1) % of the total charged current \(\bar v_\mu \) cross section. The distributions of kinematical variables are in agreement with theoretical predictions based on the PCAC hypothesis and the meson dominance model; in particular, theQ 2 dependence is well described by a propagator containing a massm=(1.35±0.18) GeV. The absolute value of the cross section is also in agreement with the model. This analysis thus provides a test of the PCAC hypothesis in the antineutrino energy range 5–150 GeV. |
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