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Coherent production of low-mass $p\pi^{+}\pi^{-}$ states in the interaction of 18.6 GeV/c protons with $^{4}He$ nuclei
A specially developed scintillator and spark chamber spectrometer has been used to measure recoiling /sup 4/He target nuclei, and a magnetic spark chamber spectrometer to measure forward-going p pi /sup +/ pi /sup -/ particles, selecting coherent events by four-momentum balance. Two enhancements in...
| Autores principales: | , , , , , , , , , , |
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| Lenguaje: | eng |
| Publicado: |
1978
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| Materias: | |
| Acceso en línea: | https://dx.doi.org/10.1016/0550-3213(78)90117-7 http://cds.cern.ch/record/879202 |
| _version_ | 1780908053597519872 |
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| author | Ekelöf, T J C Bruton, P C Davies, J K Fisher, S M Hagberg, E Herz, A J Heymann, Franz F Imrie, D C Kullander, Sven Lush, G J Nassalski, J P |
| author_facet | Ekelöf, T J C Bruton, P C Davies, J K Fisher, S M Hagberg, E Herz, A J Heymann, Franz F Imrie, D C Kullander, Sven Lush, G J Nassalski, J P |
| author_sort | Ekelöf, T J C |
| collection | CERN |
| description | A specially developed scintillator and spark chamber spectrometer has been used to measure recoiling /sup 4/He target nuclei, and a magnetic spark chamber spectrometer to measure forward-going p pi /sup +/ pi /sup -/ particles, selecting coherent events by four-momentum balance. Two enhancements in the p pi /sup +/ pi /sup -/ mass spectrum are found at 1.49 and 1.71 GeV/c/sup 2/. The branching ratio of the quasi- two-body state Delta /sup ++/ pi /sup -/ is 4.2+or-8% in the 1.71 GeV /c/sup 2/ mass region. The t slope, as a function of p pi /sup +/ pi /sup -/ mass, is consistent with what can be predicted using the impulse approximation. The decay angular analysis indicates the presence of several interfering states in the 1.5 GeV/ c/sup 2/ mass region and of one state in the 1.7 GeV/c/sup 2/ mass region. There is some preference shown for t-channel helicity conservation. (15 refs). |
| id | cern-879202 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 1978 |
| record_format | invenio |
| spelling | cern-8792022019-09-30T06:29:59Zdoi:10.1016/0550-3213(78)90117-7http://cds.cern.ch/record/879202engEkelöf, T J CBruton, P CDavies, J KFisher, S MHagberg, EHerz, A JHeymann, Franz FImrie, D CKullander, SvenLush, G JNassalski, J PCoherent production of low-mass $p\pi^{+}\pi^{-}$ states in the interaction of 18.6 GeV/c protons with $^{4}He$ nucleiNuclear PhysicsA specially developed scintillator and spark chamber spectrometer has been used to measure recoiling /sup 4/He target nuclei, and a magnetic spark chamber spectrometer to measure forward-going p pi /sup +/ pi /sup -/ particles, selecting coherent events by four-momentum balance. Two enhancements in the p pi /sup +/ pi /sup -/ mass spectrum are found at 1.49 and 1.71 GeV/c/sup 2/. The branching ratio of the quasi- two-body state Delta /sup ++/ pi /sup -/ is 4.2+or-8% in the 1.71 GeV /c/sup 2/ mass region. The t slope, as a function of p pi /sup +/ pi /sup -/ mass, is consistent with what can be predicted using the impulse approximation. The decay angular analysis indicates the presence of several interfering states in the 1.5 GeV/ c/sup 2/ mass region and of one state in the 1.7 GeV/c/sup 2/ mass region. There is some preference shown for t-channel helicity conservation. (15 refs).oai:cds.cern.ch:8792021978 |
| spellingShingle | Nuclear Physics Ekelöf, T J C Bruton, P C Davies, J K Fisher, S M Hagberg, E Herz, A J Heymann, Franz F Imrie, D C Kullander, Sven Lush, G J Nassalski, J P Coherent production of low-mass $p\pi^{+}\pi^{-}$ states in the interaction of 18.6 GeV/c protons with $^{4}He$ nuclei |
| title | Coherent production of low-mass $p\pi^{+}\pi^{-}$ states in the interaction of 18.6 GeV/c protons with $^{4}He$ nuclei |
| title_full | Coherent production of low-mass $p\pi^{+}\pi^{-}$ states in the interaction of 18.6 GeV/c protons with $^{4}He$ nuclei |
| title_fullStr | Coherent production of low-mass $p\pi^{+}\pi^{-}$ states in the interaction of 18.6 GeV/c protons with $^{4}He$ nuclei |
| title_full_unstemmed | Coherent production of low-mass $p\pi^{+}\pi^{-}$ states in the interaction of 18.6 GeV/c protons with $^{4}He$ nuclei |
| title_short | Coherent production of low-mass $p\pi^{+}\pi^{-}$ states in the interaction of 18.6 GeV/c protons with $^{4}He$ nuclei |
| title_sort | coherent production of low-mass $p\pi^{+}\pi^{-}$ states in the interaction of 18.6 gev/c protons with $^{4}he$ nuclei |
| topic | Nuclear Physics |
| url | https://dx.doi.org/10.1016/0550-3213(78)90117-7 http://cds.cern.ch/record/879202 |
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