Search for Dirac magnetic monopoles in e⁺e⁻ collisions with the OPAL detector at LEP2

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• 作者：OPAL Collaboration ; G. Abbiendi ; C. Ainsley ; P.F. Å ; kesson ; G. Alex ; er ; G. Anagnostou ; K.J. Anderson ; S. Asai ; D. Axen ; I. Bailey ; E. Barberio ; T. Barillari ; R.J. Barlow ; R.J. Batley ; P. Bechtle
• 关键词：Meconium ; Amphetamines ; LC– ; MS/MS
• 刊名：Physics Letters B
• 出版年：2008
• 期刊代码：58_03702693
• 类别：ph
• 出版时间：15 May 2008
• 卷：663
• 期：1-2
• 页码：37-42
• 文件大小：392 K

摘要

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 . The monopole signal was assumed to be characterized by two back-to-back particles with an anomalously high ionization energy loss dE/dx 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<m_M<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.