Determination of the number of light neutrino species
We have measured the cross-section of the production of single photon events in e + e- collisions near the Z ° resonance. For an integrated luminosity of 9.6 pb -1, we have observed 202 single photon candidates with energy between 0.9 and 3.5 GeV in the polar angular region between 45 ° and 135 °. A...
Guardado en:
| Autores principales: | , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
1992
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| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/73124 |
| Aporte de: |
| id |
I19-R120-10915-73124 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Ciencias Exactas cross-section single photon events Z° resonance Física |
| spellingShingle |
Ciencias Exactas cross-section single photon events Z° resonance Física Dova, María Teresa L3 Collaboration Determination of the number of light neutrino species |
| topic_facet |
Ciencias Exactas cross-section single photon events Z° resonance Física |
| description |
We have measured the cross-section of the production of single photon events in e + e- collisions near the Z ° resonance. For an integrated luminosity of 9.6 pb -1, we have observed 202 single photon candidates with energy between 0.9 and 3.5 GeV in the polar angular region between 45 ° and 135 °. Assuming that the only stable weakly interacting particles are light neutrinos with standard model couplings, we determine the number of light neutrino species to be Nv = 3.14 + 0.24 (stat.)4-0.12 (syst.). This corresponds to an invisible Z ° width of Finv = 524 + 40 4- 20 MeV. |
| format |
Articulo Articulo |
| author |
Dova, María Teresa L3 Collaboration |
| author_facet |
Dova, María Teresa L3 Collaboration |
| author_sort |
Dova, María Teresa |
| title |
Determination of the number of light neutrino species |
| title_short |
Determination of the number of light neutrino species |
| title_full |
Determination of the number of light neutrino species |
| title_fullStr |
Determination of the number of light neutrino species |
| title_full_unstemmed |
Determination of the number of light neutrino species |
| title_sort |
determination of the number of light neutrino species |
| publishDate |
1992 |
| url |
http://sedici.unlp.edu.ar/handle/10915/73124 |
| work_keys_str_mv |
AT dovamariateresa determinationofthenumberoflightneutrinospecies AT l3collaboration determinationofthenumberoflightneutrinospecies |
| bdutipo_str |
Repositorios |
| _version_ |
1764820483561226240 |