2012/07/31 by Philipp Grothaus, M. Lindner, Manfred Lindner +1 · 32 citations
Physics and Astronomy · #Annihilation #Collider #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Higgs boson #Minimal Supersymmetric Standard Model #Neutralino #Nuclear physics #Parameter space #Particle physics #Particle physics theoretical and experimental studies #Physics #Standard Model (mathematical formulation) #Statistics #astro-ph.CO #hep-ex #hep-ph
paper · pdf · doi:10.1007/jhep07(2013)094
published in Journal of High Energy Physics 2013(7) (Springer Nature) · v2: 29 pages, 16 figures. Published version
openalex publication_date 2013/07/01 · arxiv created 2013/08/09 · arxiv updated 2015/06/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate the level of fine-tuning of neutralino Dark Matter below 200 GeV in the low-energy phenomenological minimal supersymmetric Standard Model taking into account the newest results from XENON100 and the Large Hadron Collider as well as all other experimental bounds from collider physics and the cosmological abundance. We find that current and future direct Dark Matter searches significantly rule out a large area of the untuned parameter space, but solutions survive which do not increase the level of fine-tuning. As expected, the level of tuning tends to increase for lower cross-sections, but regions of resonant neutralino annihilation still allow for a band at light masses, where the fine-tuning stays small even below the current experimental limits for direct detection cross-sections. For positive values of the supersymmetric Higgs mass parameter μlarge portions of the allowed parameter space are excluded, but there still exist untuned solutions at higher neutralino masses which will essentially be ruled out if XENON1t does not observe a signal.For negative μuntuned solutions are not much constrained by current limits of direct searches and, if the neutralino mass was found outside the resonance regions, a negative μ-term would be favored from a fine-tuning perspective. Light stau annihilation plays an important role to fulfill the relic density condition in certain neutralino mass regions. Finally we discuss, in addition to the amount of tuning for certain regions in the neutralino mass-direct detection cross-section plane, the parameter mapping distribution if the allowed model parameter space is chosen to be scanned homogeneously (randomized).