This Letter describes a direct search for pair produced magnetic monopoles in e+ e- collisions. The analysis is based on 62.7 pb-1 of data collected with the OPAL detector at an average centre-of-mass energy of sqrt(s) = 206.3 GeV. The monopole signal was assumed to be characterized by two back-to-back particles with an anomalously high ionization energy loss d E / d x in the tracking chambers. No evidence for production of monopoles was observed. Upper limits were obtained on the magnetic monopole pair-production cross-section (σ) in the mass range 45 GeV / c2 < mM < 102 GeV / c2. The average limit is σ < 0.05 pb and is essentially independent of the magnetic monopole mass. The cross-section limit is derived at the 95% confidence level and is valid for spin-1/2 magnetic monopoles.
|Number of pages||6|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2008 May 15|
ASJC Scopus subject areas
- Nuclear and High Energy Physics