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.Facultad de Ciencias Exacta
A search for single and multi-photon events with missing energy is performed using data collected at...
Data are presented on the reaction \epem~\into~\gamma + no other detected particle at center-of-mass...
The reactions e(+)e(-) --> e(+)e(-) LambdaX and e(+)e(-) --> e(+)e(-) LambdaX are studied using data...
We have measured the cross-section of the production of single photon events in e + e- collisions ne...
A determination of the number of light neutrino families performed by measuring the cross section of...
Single- and multi-photon events with missing energy are selected in 619 pb−1 of data collected by th...
Single and multi-photon events with missing energy are analysed using data collected with the L3 det...
We describe the sample of energetic single-photon events (Eγ > 15 GeV) collected by L3 in the 1991–1...
We report on a study of energetic, isolated photons in a sample of ~ 320 000 Z ° hadronic decays. En...
The production of single photons has been studied in the reaction e+e- -> gamma + invisible particle...
The production of single- and multi-photon events has been studied in the reaction e+e- -> gamma ...
Using a sample of $\mathrm{e^{+}e^{-}}$ annihilation events collected with the L3 detector at the Z ...
We report inclusive photon measurements about midrapidity (\y\\u3c0.5) from Au-197+Au-197 collisions...
A search for single and multi-photon events with missing energy is performed using data collected at...
Data are presented on the reaction \epem~\into~\gamma + no other detected particle at center-of-mass...
The reactions e(+)e(-) --> e(+)e(-) LambdaX and e(+)e(-) --> e(+)e(-) LambdaX are studied using data...
We have measured the cross-section of the production of single photon events in e + e- collisions ne...
A determination of the number of light neutrino families performed by measuring the cross section of...
Single- and multi-photon events with missing energy are selected in 619 pb−1 of data collected by th...
Single and multi-photon events with missing energy are analysed using data collected with the L3 det...
We describe the sample of energetic single-photon events (Eγ > 15 GeV) collected by L3 in the 1991–1...
We report on a study of energetic, isolated photons in a sample of ~ 320 000 Z ° hadronic decays. En...
The production of single photons has been studied in the reaction e+e- -> gamma + invisible particle...
The production of single- and multi-photon events has been studied in the reaction e+e- -> gamma ...
Using a sample of $\mathrm{e^{+}e^{-}}$ annihilation events collected with the L3 detector at the Z ...
We report inclusive photon measurements about midrapidity (\y\\u3c0.5) from Au-197+Au-197 collisions...
A search for single and multi-photon events with missing energy is performed using data collected at...
Data are presented on the reaction \epem~\into~\gamma + no other detected particle at center-of-mass...
The reactions e(+)e(-) --> e(+)e(-) LambdaX and e(+)e(-) --> e(+)e(-) LambdaX are studied using data...