Abstract
A direct search has been made for magnetic monopoles produced in e^+ p collisions at a centre of mass energy of 300 GeV at HERA. The beam pipe surrounding the interaction region in 1995-1997 was investigated using a SQUID magnetometer to look for stopped magnetic monopoles. During this time an integrated luminosity of 62 pb^{-1} was delivered. No magnetic monopoles were observed and charge and mass dependent upper limits on the e^+ p production cross section are set.
Highlights
One of the outstanding issues in modern physics is the question of the existence of magnetic monopoles
A direct search has been made for magnetic monopoles produced in e+p collisions at a centre of mass energy of 300 GeV at HERA
This paper describes the first search for monopoles produced in high energy e+p collisions
Summary
One of the outstanding issues in modern physics is the question of the existence of magnetic monopoles. The quantisation of the angular momentum of a system of an electron with electric charge e and a monopole with magnetic charge g leads to Dirac’s celebrated charge quantisation condition eg = n c/2, where is Planck’s constant divided by 2π, c is the speed of light and n is an integer [1] Within this approach, taking n = 1 sets the theoretical minimum magnetic charge which can be possessed by a particle (known as the Dirac magnetic charge, gD). Monopoles are features of current unification theories such as string theory [2,3] and Supersymmetric Grand Unified Theories [4,5] Both of these approaches tend to predict heavy primordial monopoles with mass values in excess of 1015 GeV. Measurements of multi-photon production in collider experiments [11, 17] allow indirect searches for
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