| dc.creator | Dova, María Teresa | |
| dc.creator | L3 Collaboration | |
| dc.date | 1992-10-15 | |
| dc.date | 2019-03-13T18:08:25Z | |
| dc.identifier | http://sedici.unlp.edu.ar/handle/10915/73124 | |
| dc.identifier | issn:0370-2693 | |
| dc.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. | |
| dc.description | Facultad de Ciencias Exactas | |
| dc.format | application/pdf | |
| dc.format | 463-471 | |
| dc.language | en | |
| dc.rights | http://creativecommons.org/licenses/by-nc-sa/4.0/ | |
| dc.rights | Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) | |
| dc.subject | Ciencias Exactas | |
| dc.subject | cross-section | |
| dc.subject | single photon events | |
| dc.subject | Z° resonance | |
| dc.subject | Física | |
| dc.title | Determination of the number of light neutrino species | |
| dc.type | Articulo | |
| dc.type | Articulo | |
