We have measured the cross-section of the reaction e +e -→γγ at center of mass energies around the Z 0 mass. The results are in good agreement with QED predictions. For the QED cutoff parameters the limit of Λ + > 103 GeV and Λ - > 118 GeV are found. For the decays Z 0→γγ, Z 0→π 0γ, Z 0→ηγ and Z 0→γγγ we find upper limits of 2.9×10 -4, 2.9×10 -4, 4.1×10 -4 and 1.2×10 -4, respectively. All limits are at 95% CL.
Test of QED in e +e -→γγ at LEP / A. O., Aguilar Benitez; Alviggi, Mariagrazia; Aloisio, Alberto; Chiefari, Giovanni; Napolitano, Marco; Merola, Leonardo; Paternoster, Giovanni; Patricelli, Sergio; Sciacca, Crisostomo. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 250:(1990), pp. 199-204.
Test of QED in e +e -→γγ at LEP
ALVIGGI, MARIAGRAZIA;ALOISIO, ALBERTO;CHIEFARI, GIOVANNI;NAPOLITANO, MARCO;MEROLA, LEONARDO;PATERNOSTER, GIOVANNI;PATRICELLI, SERGIO;SCIACCA, CRISOSTOMO
1990
Abstract
We have measured the cross-section of the reaction e +e -→γγ at center of mass energies around the Z 0 mass. The results are in good agreement with QED predictions. For the QED cutoff parameters the limit of Λ + > 103 GeV and Λ - > 118 GeV are found. For the decays Z 0→γγ, Z 0→π 0γ, Z 0→ηγ and Z 0→γγγ we find upper limits of 2.9×10 -4, 2.9×10 -4, 4.1×10 -4 and 1.2×10 -4, respectively. All limits are at 95% CL.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
