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Naturalness reach of the Large Hadron Collider in minimal supergravity

Allanach, BC; Hetherington, JPJ; Parker, MA; Webber, BR; (2000) Naturalness reach of the Large Hadron Collider in minimal supergravity. Journal of High Energy Physics , 4 (8 PART A) 12 - 15.

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Abstract

We re-analyse the prospects of discovering supersymmetry at the LHC, in order to re-express coverage in terms of a fine-tuning parameter and to extend the analysis to scalar masses (m) above 2 TeV. We use minimal supergravity (mSUGRA) unification assumptions for the SUSY breaking parameters. The discovery reach at high m is of renewed interest because this region has recently been found to have a focus point, leading to relatively low fine-tuning, and because it remains uncertain how much of the region can be ruled out due to lack of radiative electroweak symmetry breaking. The best fine tuning reach is found in a mono-leptonic channel, where for μ > 0, A = 0 and tanβ = 10 (within the focus point region), and a top mass of 174 GeV, all points in mSUGRA with m < 4000 GeV, with a fine tuning measure up to 210 (500) are covered by the search, where the definition of fine-tuning excludes (includes) the contribution from the top Yukawa coupling. Even for arbitrarily high m, mSUGRA can be discovered through gaugino events, provided the gaugino mass parameter M < 460 GeV. In this region, the mono-leptonic channel still provides the best reach.

Type: Article
Title: Naturalness reach of the Large Hadron Collider in minimal supergravity
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Computer Science
URI: http://discovery.ucl.ac.uk/id/eprint/1360302
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