Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Multi-photon production in e+ e- collisions at √s=183 GeV. / OPAL Collaboration.
In: Physics Letters B, Vol. 438, No. 3-4, 22.10.1998, p. 379-390.Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Multi-photon production in e+ e- collisions at √s=183 GeV
AU - Kartvelishvili, Vakhtang
AU - OPAL Collaboration
PY - 1998/10/22
Y1 - 1998/10/22
N2 - The process e e q y™gg gŽ . is studied using data recorded with the OPAL detector at LEP. The data sample correspondsto a total integrated luminosity of 56.2 pby1 taken at a centre-of-mass energy of 183 GeV. The measured cross-sectionagrees well with the expectation from QED. A fit to the angular distribution is used to obtain improved limits at 95% CL onthe QED cut-off parameters: Lq y ) 233 GeV and L ) 265 GeV as well as a mass limit for an excited electron, Me))227 GeV assuming equal e)eg and eeg couplings. No evidence for resonance production is found in the invariant massspectrum of photon pairs. Limits are obtained for the cross-section times branching ratio for a resonance decaying into twophotons.
AB - The process e e q y™gg gŽ . is studied using data recorded with the OPAL detector at LEP. The data sample correspondsto a total integrated luminosity of 56.2 pby1 taken at a centre-of-mass energy of 183 GeV. The measured cross-sectionagrees well with the expectation from QED. A fit to the angular distribution is used to obtain improved limits at 95% CL onthe QED cut-off parameters: Lq y ) 233 GeV and L ) 265 GeV as well as a mass limit for an excited electron, Me))227 GeV assuming equal e)eg and eeg couplings. No evidence for resonance production is found in the invariant massspectrum of photon pairs. Limits are obtained for the cross-section times branching ratio for a resonance decaying into twophotons.
U2 - 10.1016/S0370-2693(98)01096-X
DO - 10.1016/S0370-2693(98)01096-X
M3 - Journal article
VL - 438
SP - 379
EP - 390
JO - Physics Letters B
JF - Physics Letters B
SN - 0370-2693
IS - 3-4
ER -