Journal article
Measurement of single photon production in e e- collisions near the Z0 resonance
R Akers, G Alexander, J Allison, KJ Anderson, S Arcelli, S Asai, A Astbury, D Axen, G Azuelos, AH Ball, E Barberio, RJ Barlow, R Bartoldus, JR Batley, G Beaudoin, A Beck, GA Beck, J Becker, C Beeston, T Behnke Show all
Zeitschrift Fur Physik C Particles and Fields | SPRINGER | Published : 1995
DOI: 10.1007/BF01571303
Abstract
A measurement of the single photon production cross-section is presented based on a data-sample of 40.5 pb-1 collected with the OPAL detector at centre-of-mass energies within 3 GeV of the Z0 mass. Single photon events arise from initial state radiation and the production of an "invisible" final state consisting of neutrinos or possibly particles such as sneutrinos or photinos. The single photon topology is also sensitive to new Z0 decays such as {Mathematical expression} or Z0→γX, X→invisible particles. A total of 447 single photon candidates were observed with energy exceeding 1.75 GeV in the polar angle region |cosθ|<0.7. The estimated background from processes with visible reaction produ..
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