The L3 detector at LEP has been used to determine the number of light neutrino families by measuring the cross section of single photon even in e+e- collisions at energies near the Z0 resonance. We have observed 61 single photon candidates with more than 1.5 GeV of deposited energy in the barrel electromagnetic calorimeter, for a total integrated luminosity of 3.0 pb-1. From a likelihood fit to the single photon cross sections, we determine N(nu) = 3.24 +/- 0.46 (statistical) +/- 0.22 (systematic).

A Direct Determination of the Number of Light Neutrino Families From E+e--]nu-nu-bar-gamma At Lep / B., A., O., A., M., A., H., A., J., A., Aloisio, A., G., A., Alviggi, M., G., A., Q., A.n., H., A., A. L., A., V. P., A., T., A., L., A., D., A., P., A., A., A., A., A., T., A., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 275:(1992), pp. 209-221. [10.1016/0370-2693(92)90877-7]

A Direct Determination of the Number of Light Neutrino Families From E+e--]nu-nu-bar-gamma At Lep

ALOISIO, ALBERTO;ALVIGGI, MARIAGRAZIA;CHIEFARI, GIOVANNI;MEROLA, LEONARDO;NAPOLITANO, MARCO;PATRICELLI, SERGIO;SCIACCA, CRISOSTOMO;
1992

Abstract

The L3 detector at LEP has been used to determine the number of light neutrino families by measuring the cross section of single photon even in e+e- collisions at energies near the Z0 resonance. We have observed 61 single photon candidates with more than 1.5 GeV of deposited energy in the barrel electromagnetic calorimeter, for a total integrated luminosity of 3.0 pb-1. From a likelihood fit to the single photon cross sections, we determine N(nu) = 3.24 +/- 0.46 (statistical) +/- 0.22 (systematic).
1992
A Direct Determination of the Number of Light Neutrino Families From E+e--]nu-nu-bar-gamma At Lep / B., A., O., A., M., A., H., A., J., A., Aloisio, A., G., A., Alviggi, M., G., A., Q., A.n., H., A., A. L., A., V. P., A., T., A., L., A., D., A., P., A., A., A., A., A., T., A., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 275:(1992), pp. 209-221. [10.1016/0370-2693(92)90877-7]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/481308
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