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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 |
| Affiliation: | 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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