A measurement of coherent neutral pion production in neutrino neutral current interactions in the NOMAD experiment
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Datum
2009-11-30Typ
- Journal Article
ETH Bibliographie
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Abstract
We present a study of exclusive neutral pion production in neutrino-nucleus Neutral Current interactions using data from the NOMAD experiment at the CERN SPS. The data correspond to 1.44 × 10 6 muon-neutrino Charged Current interactions in the energy range 2.5 ≤ E ν ≤ 300 GeV. Neutrino events with only one visible π 0 in the final state are expected to result from two Neutral Current processes: coherent π 0 production, ν + A → ν + A + π 0 and single π 0 production in neutrino-nucleon scattering. The signature of coherent π 0 production is an emergent π 0 almost collinear with the incident neutrino while π 0 's produced in neutrino-nucleon deep inelastic scattering have larger transverse momenta. In this analysis all relevant backgrounds to the coherent π 0 production signal are measured using data themselves. Having determined the backgrounds, and using the Rein-Sehgal model for the coherent π 0 production to compute the detection efficiency, we obtain 4630 ± 522 (stat) ± 426 (syst) corrected coherent-π 0 events with E π0 ≥ 0.5 GeV. We measure σ (ν A → ν A π 0 ) = [72.6 ± 8.1 (stat) ± 6.9 (syst)] × 10 - 40 cm 2 / nucleus. This is the most precise measurement of the coherent π 0 production to date. Mehr anzeigen
Persistenter Link
https://doi.org/10.3929/ethz-b-000019857Publikationsstatus
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Zeitschrift / Serie
Physics Letters BBand
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Verlag
ElsevierThema
Coherent pion neutrino neutral currentETH Bibliographie
yes
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