Measurement of the reaction e+e → γγ at CMS energies from 9.4 to 31.6 GeV

PLUTO Collaboration

Research output: Contribution to journalArticlepeer-review

Abstract

The differential cross section for the reaction e+e → γγ has been measured in the CMS energy range between 9.4 and 31.6 GeV. The results are found to be in agreement with the predictions of quantum electrodynamics up to momentum transfers-q2 of 900 GeV2. The data set lower limits of about 40 GeV on QED cut-off parameters. We have searched for the decay υ (9.46) → γγ and obtain an upper limit Γ(υ → γγ)/Γ(υ → all) < 1.4% (95% c.l.).

Original languageEnglish
Pages (from-to)87-90
Number of pages4
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume94
Issue number1
DOIs
StatePublished - 1980
Externally publishedYes

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