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A study of single and multi-photon production in e+e− collisions at centre-of-mass energies of 130 and 136 GeV

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • ALEPH Collaboration
<mark>Journal publication date</mark>1996
<mark>Journal</mark>Physics Letters B
Issue number1-4
Number of pages10
Pages (from-to)333-342
Publication StatusPublished
<mark>Original language</mark>English


The production of final states involving one or more energetic photons from e+e− collisions at high energies is studied using data collected by the ALEPH detector at LEP. The data consist of two samples of 2.9 pb−1 each, recorded at centre-of-mass energies of 130 GeV and 136 GeV. The data are in agreement with the predictions of the Standard Model. From an analysis of two-photon final states new limits are placed on the parameters of models involving e+e−γγ contact interactions and excited electrons. The 95% confidence level lower limits on the QED cut-off parameters Λ+ and Λ− are found to be 169 and 132 GeV respectively.