Search for magnetic monopoles at the CERN Intersecting Storage Rings

In a search for magnetic monopoles produced in high-energy $\mathrm{pp}$ collisions, a series of metallic collectors was exposed at an intersection region of the CERN Intersecting Storage Rings to an integrated luminosity $Lt\dot{\simeq }7.2\times {10}^{37}$ ${\mathrm{cm}}^{-2\mathrm{}}$. The search was sensitive to poles with a mass $m_g\lesssim 30$ GeV. For $m_g<20\mathrm{}$ GeV, the search yielded an upper-limit cross section of $\sigma <1.3\mathrm{}\times {10}^{-37\mathrm{}}$ ${\mathrm{cm}}^2$ (95% confidence level) for $0.2\lesssim g\lesssim 1.2$ Dirac magnetic charges; for $1.2<g<\mathrm{}24\mathrm{}$ the limit is $\sigma \lesssim 4\times {10}^{-37\mathrm{}}$ ${\mathrm{cm}}^2$.