A Test of quantum electrodynamics in the reaction e+e− → γγ(γ)

Article Article scientifique Article A Test of quantum electrodynamics in the reaction e+e− → γγ(γ) eng 1992 L3 collaborator Akbari Abdollah Johns Hopkins U. 37802 collaborator Bizzarri Hugo Oscar INFN, Rome 681343 collaborator Bourquin Maurice 25314 Administration de la faculté des sciences (SIAD) collaborator Burger William 27634 collaborator Duchesneau Dominique Robert 24550 collaborator Perrier Jacques 26408 collaborator Produit Nicolas 0000-0001-7138-7677 22959 Département d'astronomie (ASTRO) collaborator Wenninger Joerg Horst 23311 404-411 10.1016/0370-2693(92)91120-x 0370-2693 https://linkinghub.elsevier.com/retrieve/pii/037026939291120X We have measured the total and differential cross sections of the reaction e + e − → γγ ( γ ) at center-of-mass energies around 91 GeV, with an integrated luminosity of 14.2 pb −1 . The results are in good agreement with QED predictions. We set lower limits, at 95% confidence level, on the QED cutoff parameters of Λ + > 139 GeV, Λ − > 108 GeV and on the mass of an excited electron of m e∗ > 127 GeV . We searched for Z 0 rare decays with photonic signitures in the final state. Upper limits, at 95% confidence level, for branching ratio of Z 0 decaying into π 0 γ / γγ , νγ and γγγ are 1.2 × 10 −4 , 1.8 × 10 −4 , 3.3 × 10 −5 respectively. Electron positron: colliding beams Colliding beams: electron positron Electron positron: annihilation Annihilation: electron positron Photon: pair production Pair production: photon Photon: multiple production Multiple production: photon Radiative correction Quantum electrodynamics: Lambda parameter Mass: excited state Excited state: mass Channel cross section: energy dependence Differential cross section: angular dependence Angular dependence: differential cross section Z0: electroproduction Electroproduction: Z0 Z0: rare decay Rare decay: Z0 Z0: branching ratio Upper limit L3 Experimental results CERN LEP Stor Electron positron --> 2photon Electron positron --> 3photon Z0 --> pi0 photon Z0 --> eta photon Z0 --> 3photon 88.5-93.7 GeV-cms Dewey 520 26 Département d'astronomie 12 false Physics letters. B 288 3-4 02f9bec0-fd65-482c-ba48-f46bc55da344 Article (Published version) Restricted Article_scientifique_from_unpaywall1.pdf 556563 application/pdf bd3c2f9f3c29c417fad7ae1eef85862a87b43828569522ca245ebadf9c8a36aa restrictedAccess Faculté des sciences / Département d'astronomie

Title	Published in	Access level	OA Policy	Year	Views	Downloads

A Test of quantum electrodynamics in the reaction e⁺e⁻ → γγ(γ)	Physics letters. B			1992	21	0

Archive ouverte UNIGE

Akbari, Abdollah